Rev. 1.6 10/13 Copyright © 2013 by Silicon Laboratories Si840x
Not Recommended
for New Designs
Si840x
BIDIRECTIONAL I2C ISOLATORS WITH UNIDIRECTIONAL
DIGITAL CHANNELS
Features
Applications
Description
The Si840x series of isolators are single-package galvanic isolation
solutions for I2C and SMBus serial port applications. These products are
based on Silicon Labs proprietary RF isolation technology and offer shorter
propagation delays, lower power consumption, smaller installed size, and
more stable operation with temperature and age versus opto couplers or
other digital isolators.
All devices in this family include hot-swap, bidirectional SDA and SCL
isolation channels with open-drain, 35 mA sink capability and operate to a
maximum frequency of 1.7 MHz. The 8-pin version (Si8400/01) supports
bidirectional SDA and SCL isolation; the Si8402 supports bidirectional SDA
and unidirectional SCL isolation, and the 16-pin version (Si8405) features
two unidirectional isolation channels to support additional system signals,
such as an interrupt or reset. All versions contain protection circuits to
guard against data errors if an unpowered device is inserted into a powered
system.
Small size, low installed cost, low power consumption, and short
propagation delays make the Si840x family the optimum solution for
isolating I2C and SMBus serial ports.
Safety Regulatory Approval
Independent, bidirectional SDA and
SCL isolation channels
Open drain outputs with 35 mA
sink current
Supports I2C clocks up to 1.7 MHz
Unidirectional isolation channels
support additional system signals
(Si8405)
Up to 2500 VRMS isolation
UL, CSA, VDE recognition
60-year life at rated working voltage
High electromagnetic immunity
Wide operating supply voltage
3.0 to 5.5 V
Wide temperature range
–40 to +125 °C max
Transient immunity 25 kV/µs
RoHS-compliant packages
SOIC-8 narrow body
SOIC-16 narrow body
Isolated I2C, PMBus, SMBus
Power over Ethernet
Motor Control Systems
Hot-swap applications
Intelligent Power systems
Isolated SMPS systems with
PMBus interfaces
UL 1577 recognized
Up to 2500 VRMS for 1 minute
CSA component notice 5A approval
IEC 60950-1, 61010-1
(reinforced insulation)
VDE certification conformity
IEC 60747-5-2
(VDE0884 Part 2)
Ordering Information:
See page 25.
Si840x
2 Rev. 1.6
Not Recommended
for New Designs
Si840x
Rev. 1.6 3
Not Recommended
for New Designs
TABLE OF CONTENTS
Section Page
1. Electrical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
1.1. Test Circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
2. Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
2.1. Theory of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
3. Device Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
3.1. Device Startup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
3.2. Under Voltage Lockout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
3.3. Layout Recommendations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
3.4. Input and Output Characteristics for Non-I2C Digital Channels . . . . . . . . . . . . . . . . 15
3.5. Typical Performance Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
4. Typical Application Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18
4.1. I2C Background . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18
4.2. I2C Isolator Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18
4.3. I2C Isolator Design Constraints . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19
4.4. I2C Isolator Design Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19
5. Errata and Design Migration Guidelines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22
5.1. Power Supply Bypass Capacitors (Revision A and Revision B) . . . . . . . . . . . . . . . .22
6. Pin Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23
7. Ordering Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25
8. Package Outline: 8-Pin Narrow Body SOIC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26
9. Land Pattern: 8-Pin Narrow Body SOIC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27
10. Package Outline: 16-Pin Narrow Body SOIC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28
11. Land Pattern: 16-Pin Narrow Body SOIC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .30
12. Top Marking: 8-Pin Narrow Body SOIC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31
12.1. 8-Pin Narrow Body SOIC Top Marking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31
12.2. Top Marking Explanation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
13. Top Marking: 16-Pin Narrow Body SOIC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .32
13.1. 16-Pin Narrow Body SOIC Top Marking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .32
13.2. Top Marking Explanation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Document Change List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33
Contact Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .34
Si840x
4 Rev. 1.6
Not Recommended
for New Designs
1. Electrical Specifications
Table 1. Absolute Maximum Ratings1
Parameter Symbol Min Typ Max Unit
Storage Temperature2TSTG –65 — 150 °C
Ambient Temperature Under Bias TA–40 — 125 °C
Supply Voltage (Revision A)3VDD –0.5 — 5.75 V
Supply Voltage (Revision B)3VDD –0.5 — 6.0 V
Input Voltage VI–0.5 — VDD + 0.5 V
Output Voltage VO–0.5 — VDD + 0.5 V
Output Current Drive (non-I2C channels) IO——±10mA
Side A output current drive (I2C channels) IO——±15mA
Side B output current drive (I2C channels) IO——±75mA
Lead Solder Temperature (10 s) — — 260 °C
Maximum Isolation Voltage (1 s) — — 3600 VRMS
Notes:
1. Permanent device damage may occur if the absolute maximum ratings are exceeded. Functional operation should be
restricted to conditions as specified in the operational sections of this data sheet.
2. VDE certifies storage temperature from –40 to 150 °C.
3. See "7.Ordering Guide" on page 25 for more information.
Table 2. Si840x Power Characteristics*
3.0 V < VDD < 5.5 V. TA = –40 to +125 °C. Typical specs at 25 °C (See Figures 2 and 16 for test diagrams.)
Parameter Symbol Test Condition Min Typ Max Unit
Si8400/01/02 Supply Current
AVDD current
BVDD current
Idda
Iddb
All channels = 0 dc —
—
4.2
3.9
6.3
5.9
mA
mA
AVDD current
BVDD current
Idda
Iddb
All channels = 1 dc —
—
2.3
1.9
3.5
2.9
mA
mA
AVDD current
BVDD current
Idda
Iddb
All channels = 1.7 MHz —
—
3.2
2.9
4.8
4.4
mA
mA
Si8405 Supply Current
AVDD current
BVDD current
Idda
Iddb
All non-I2C channels = 0
All I2C channels = 1
—
—
3.2
2.9
4.8
4.4
mA
mA
AVDD current
BVDD current
Idda
Iddb
All non-I2C channels = 1
All I2C channels = 0
—
—
6.2
6.0
9.3
9.0
mA
mA
AVDD current
BVDD current
Idda
Iddb
All non-I2C channels = 5 MHz
All I2C channels = 1.7 MHz
—
—
4.7
4.5
7.1
6.8
mA
mA
*Note: All voltages are relative to respective ground.
Si840x
Rev. 1.6 5
Not Recommended
for New Designs
Table 3. Si8400/01/02/05 Electrical Characteristics for Bidirectional I2C Channels1
3.0 V < VDD < 5.5 V. TA = –40 to +125 °C. Typical specs at 25 °C unless otherwise noted.
Parameter Symbol Test Condition Min Typ Max Unit
Logic Levels Side A
Logic Input Threshold2
Logic Low Output Voltages3
Input/Output Logic Low Level
Difference4
I2CVT (Side A)
I2CVOL (Side A)
I2CV (Side A)
ISDAA = ISCLA = 3.0 mA
ISDAA = ISCLA = 0.5 mA
450
650
550
50
—
—
—
—
780
910
825
—
mV
mV
mV
mV
Logic Levels Side B
Logic Low Input Voltage
Logic High Input Voltage
Logic Low Output Voltage
I2CVIL (Side B)
I2CVIH (Side B)
I2CVOL (Side B) ISCLB = 35 mA
—
2.0
—
—
—
—
0.8
—
400
V
V
mV
SCL and SDA Logic High
Leakage
Isdaa, Isdab
Iscla, Isclb
SDAA, SCLA = VSSA
SDAB, SCLB = VSSB
—2.010µA
Pin capacitance SDAA, SCLA,
SDAB, SDBB
CA
CB
—
—
10
10
—
—
pF
pF
Notes:
1. All voltages are relative to respective ground.
2. VIL < 0.450 V, VIH > 0.780 V.
3. Logic low output voltages are 910 mV max from –10 to 125 °C at 3.0 mA.
Logic low output voltages are 955 mV max from –40 to 125 °C at 3.0 mA.
Logic low output voltages are 825 mV max from –10 to 125 °C at 0.5 mA.
Logic low output voltages are 875 mV max from –40 to 125 °C at 0.5 mA.
See “AN375: Design Considerations for Isolating an I2C Bus or SMBus” for additional information.
4. I2CV (Side A) = I2CVOL (Side A) – I2CVT (Side A). To ensure no latch-up on a given bus, I2CV (Side A) is the
minimum difference between the output logic low level of the driving device and the input logic threshold.
5. Side A measured at 0.6 V.
Si840x
6 Rev. 1.6
Not Recommended
for New Designs
Timing Specifications (Measured at 1.40 V Unless Otherwise Specified)
Maximum I2C bus Frequency Fmax — — 1.7 MHz
Propagation Delay
5 V Operation
Side A to side B rising5
Side A to side B falling5
Side B to side A rising
Side B to side A falling
3.3 V Operation
Side A to side B rising5
Side A to side B falling5
Side B to side A rising
Side B to side A falling
Tphab
Tplab
Tphba
Tplba
Tphab
Tplab
Tphba
Tplba
No bus capacitance,
R1 = 1400,
R2 = 499,
See Figure 2
R1 = 806
R2 = 499
—
—
—
—
—
—
—
—
25
15
20
9.0
28
13
20
10
29
22
30
12
35
18
40
15
ns
ns
ns
ns
ns
ns
ns
ns
Pulse width distortion
5V
Side A low to Side B low5
Side B low to Side A low
3.3 V
Side A low to Side B low5
Side B low to Side A low
PWDAB
PWDBA
PWDAB
PWDBA
No bus capacitance,
R1 = 1400,
R2 = 499,
See Figure 2
R1 = 806,
R2 = 499
—
—
—
—
9.0
11
15
11
15
20
22
30
ns
ns
ns
ns
Table 3. Si8400/01/02/05 Electrical Characteristics for Bidirectional I2C Channels1 (Continued)
3.0 V < VDD < 5.5 V. TA = –40 to +125 °C. Typical specs at 25 °C unless otherwise noted.
Parameter Symbol Test Condition Min Typ Max Unit
Notes:
1. All voltages are relative to respective ground.
2. VIL < 0.450 V, VIH > 0.780 V.
3. Logic low output voltages are 910 mV max from –10 to 125 °C at 3.0 mA.
Logic low output voltages are 955 mV max from –40 to 125 °C at 3.0 mA.
Logic low output voltages are 825 mV max from –10 to 125 °C at 0.5 mA.
Logic low output voltages are 875 mV max from –40 to 125 °C at 0.5 mA.
See “AN375: Design Considerations for Isolating an I2C Bus or SMBus” for additional information.
4. I2CV (Side A) = I2CVOL (Side A) – I2CVT (Side A). To ensure no latch-up on a given bus, I2CV (Side A) is the
minimum difference between the output logic low level of the driving device and the input logic threshold.
5. Side A measured at 0.6 V.
Si840x
Rev. 1.6 7
Not Recommended
for New Designs
Table 4. Electrical Characteristics for Unidirectional Non-I2C Digital Channels (Si8402/05)
3.0 V < VDD < 5.5 V. TA = –40 to +125 °C. Typical specs at 25 °C
Parameter Symbol Test Condition Min Typ Max Unit
High Level Input Voltage VIH 2.0 — — V
Low Level Input Voltage VIL ——0.8V
High Level Output Voltage VOH loh = –4 mA AVDD, BVDD
–0.4
4.8 — V
Low Level Output Voltage VOL lol = 4 mA — 0.2 0.4 V
Input Leakage Current IL——±10µA
Output Impedance1ZO—85—
Timing Characteristics
Maximum Data Rate 0 — 10 Mbps
Minimum Pulse Width — — 40 ns
Propagation Delay tPHL, tPLH See Figure 1 — — 20 ns
Pulse Width Distortion
|tPLH - tPHL|
PWD See Figure 1 — — 12 ns
Propagation Delay Skew2tPSK(P-P) — — 20 ns
Channel-Channel Skew tPSK — — 10 ns
Output Rise Time trC3=15pF
See Figure 1 and
Figure 2
—4.06.0ns
Output Fall Time tfC3=15pF
See Figure 1 and
Figure 2
—3.04.3ns
Notes:
1. The nominal output impedance of a non-I2C isolator driver channel is approximately 85 , ±40%, which is a
combination of the value of the on-chip series termination resistor and channel resistance of the output driver FET.
When driving loads where transmission line effects will be a factor, output pins should be appropriately terminated with
controlled impedance PCB traces.
2. tPSK(P-P) is the magnitude of the difference in propagation delay times measured between different units operating at
the same supply voltages, load, and ambient temperature.
Si840x
8 Rev. 1.6
Not Recommended
for New Designs
Figure 1. Propagation Delay Timing (Non-I2C Channels)
1.1. Test Circuits
Figure 2 depicts the timing test diagram.
Figure 2. Simplified Timing Test Diagram
Table 5. Electrical Characteristics for All I2C and Non-I2C Channels
3.0 V < VDD < 5.5 V. TA = –40 to +125 °C. Typical specs at 25 °C
Parameter Symbol Test Condition Min Typ Max Unit
VDD Undervoltage Threshold VDDUV+ AVDD, BVDD rising 2.15 2.3 2.5 V
VDD Negative-going Lockout
Hysteresis
VDDH– AVDD, BVDD falling 45 75 95 mV
Common Mode Transient
Immunity
CMTI VI=V
DD or 0 V — 25 — kV/µs
Shut Down Time from UVLO tSD —3.0—µs
Start-up Time*tSTART —1540µs
*Note: Start-up time is the time period from the application of power to valid data at the output.
Typical
Input
tPLH tPHL
Typical
Output
trtf
90%
10%
90%
10%
1.4 V
1.4 V
AVDD
NC
BVDD
NC
NC NC
ADOUT BDIN
ASDA BSDA
ASCL BSCL
ADIN BDOUT
AGND BGND
Si840x
C1C1C3
R1R1R2
R2
C3C2C2
Si840x
Rev. 1.6 9
Not Recommended
for New Designs
Table 6. Regulatory Information*
CSA
The Si84xx is certified under CSA Component Acceptance Notice 5A. For more details, see File 232873.
61010-1: Up to 300 VRMS reinforced insulation working voltage; up to 600 VRMS basic insulation working voltage.
60950-1: Up to 130 VRMS reinforced insulation working voltage; up to 600 VRMS basic insulation working voltage.
VDE
The Si84xx is certified according to IEC 60747-5-2. For more details, see File 5006301-4880-0001.
60747-5-2: Up to 560 Vpeak for basic insulation working voltage.
UL
The Si84xx is certified under UL1577 component recognition program. For more details, see File E257455.
Rated up to 2500 VRMS isolation voltage for basic insulation.
*Note: Regulatory Certifications apply to 2.5 kVRMS rated devices which are production tested to 3.0 kVRMS for 1 sec.
For more information, see "7.Ordering Guide" on page 25.
Table 7. Insulation and Safety-Related Specifications
Parameter Symbol Test Condition Value Unit
NB SOIC-8 NB SOIC-16
Nominal Air Gap (Clearance)1L(1O1) 4.9 4.9 mm
Nominal External Tracking (Creepage)1L(1O2) 4.01 4.01 mm
Minimum Internal Gap
(Internal Clearance)
0.008 0.008 mm
Tracking Resistance
(Proof Tracking Index) PTI IEC60112 600 600 VRMS
Erosion Depth ED 0.040 0.019 mm
Resistance (Input-Output)2RIO 1012 1012
Capacitance (Input-Output)2CIO f=1MHz 1.0 2.0 pF
Input Capacitance3CI4.0 4.0 pF
Notes:
1. The values in this table correspond to the nominal creepage and clearance values as detailed in “8. Package Outline:
8-Pin Narrow Body SOIC” and “10. Package Outline: 16-Pin Narrow Body SOIC”. VDE certifies the clearance and
creepage limits as 4.7 mm minimum for the NB SOIC-8 package and 4.7 mm minimum for the NB SOIC-16 package.
UL does not impose a clearance and creepage minimum for component level certifications. CSA certifies the
clearance and creepage limits as 3.9 mm minimum for the NB SOIC-8 package and 3.9 mm minimum for the NB
SOIC-16 package.
2. To determine resistance and capacitance, the Si840x, SO-16, is converted into a 2-terminal device. Pins 1–8 (1-4, SO-
8) are shorted together to form the first terminal and pins 9–16 (5–8, SO-8) are shorted together to form the second
terminal. The parameters are then measured between these two terminals.
3. Measured from input pin to ground.
Si840x
10 Rev. 1.6
Not Recommended
for New Designs
Table 8. IEC 60664-1 (VDE 0844 Part 2) Ratings
Parameter Test Condition Specification
Basic Isolation Group Material Group I
Installation Classification
Rated Mains Voltages < 150 VRMS I-IV
Rated Mains Voltages < 300 VRMS I-III
Rated Mains Voltages < 400 VRMS I-II
Rated Mains Voltages < 600 VRMS I-II
Table 9. IEC 60747-5-2 Insulation Char acteristics for Si84xxxB*
Parameter Symbol Test Condition Characteristic Unit
Maximum Working Insulation Voltage VIORM 560 V peak
Input to Output Test Voltage
VPR
Method b1
(VIORM x 1.875 = VPR, 100%
Production Test, tm=1 sec,
Partial Discharge < 5 pC)
1050
V peak
Transient Overvoltage VIOTM t = 60 sec 4000 V peak
Pollution Degree (DIN VDE 0110, Table 1) 2
Insulation Resistance at TS, VIO =500V RS>109
*Note: Maintenance of the safety data is ensured by protective circuits. The Si84xx provides a climate classification of
40/125/21.
Table 10. IEC Safety Limiting Values1
Parameter Symbol Test Condition NB
SOIC-8 NB
SOIC-16 Unit
Case Temperature TS150 150 °C
Safety Input Current ISJA = 105 °C/W (NB SOIC-16),
140 °C/W (NB SOIC-8)
AVDD, BVDD = 5.5 V,
TJ=150°C, T
A=25°C
160 210 mA
Device Power Dissipation2PD220 275 W
Notes:
1. Maximum value allowed in the event of a failure. Refer to the thermal derating curve in Figure 3 and Figure 4.
2. The Si840x is tested with AVDD, BVDD = 5.5 V; TJ=150ºC; C
1, C2=0.1µF; C
3=15pF; R1, R2=3kinput 1 MHz
50% duty cycle square wave.
Si840x
Rev. 1.6 11
Not Recommended
for New Designs
Figure 3. NB SOIC-8 Thermal Derating Curve, Dependence of Safety Limiting Values
with Case Temperature per DIN EN 60747-5-2
Figure 4. NB SOIC-16 Thermal Derating Curve, Dependence of Safety Limiting Values
with Case Temperature per DIN EN 60747-5-2
Table 11. Thermal Characteristics
Parameter Symbol Test Condition NB
SOIC-8 NB
SOIC-16 Unit
IC Junction-to-Air Thermal Resistance JA 140 105 °C/W
0 20015010050
400
200
100
0
Case Temperature (ºC)
Safety-Limiting Values (mA)
300
AVDD, BVDD = 3.6 V
AVDD, BVDD = 5.5 V
270
160
020015010050
500
400
200
100
0
Temperature (ºC)
Safety-Limiting Current (mA)
300
350
210
AVDD , BVDD = 3.6 V
AVDD , BVDD = 5.5 V
Si840x
12 Rev. 1.6
Not Recommended
for New Designs
2. Functional Description
2.1. Theory of Operation
The operation of an Si84xx channel is analogous to that of an opto coupler, except an RF carrier is modulated
instead of light. This simple architecture provides a robust isolated data path and requires no special
considerations or initialization at start-up. A simplified block diagram for a single unidirectional Si84xx channel is
shown in Figure 5.
Figure 5. Simplified Channel Diagram
A channel consists of an RF Transmitter and RF Receiver separated by a semiconductor-based isolation barrier.
Referring to the Transmitter, input A modulates the carrier provided by an RF oscillator using on/off keying. The
Receiver contains a demodulator that decodes the input state according to its RF energy content and applies the
result to output B via the output driver. This RF on/off keying scheme is superior to pulse code schemes as it
provides best-in-class noise immunity, low power consumption, and better immunity to magnetic fields. See
Figure 6 for more details.
Figure 6. Modulation Scheme
RF
OSCILLATOR
MODULATOR DEMODULATOR
A B
Semiconductor-
Based Isolation
Barrier
Transmitter Receiver
Input Signal
Output Signal
Modulation Signal
Si840x
Rev. 1.6 13
Not Recommended
for New Designs
3. Device Operation
Device behavior during start-up, normal operation, and shutdown is shown in Figure 7, where UVLO+ and UVLO–
are the positive-going and negative-going thresholds respectively. Refer to Table 12 to determine outputs when
power supply (VDD) is not present.
3.1. Device Startup
Outputs are held low during powerup until VDD is above the UVLO threshold for time period tSTART. Following
this, the outputs follow the states of inputs.
3.2. Under Voltage Lockout
Under Voltage Lockout (UVLO) is provided to prevent erroneous operation during device startup and shutdown or
when VDD is below its specified operating circuits range. Both Side A and Side B each have their own under
voltage lockout monitors. Each side can enter or exit UVLO independently. For example, Side A unconditionally
enters UVLO when AVDD falls below AVDDUVLO– and exits UVLO when AVDD rises above AVDDUVLO+. Side B
operates the same as Side A with respect to its BVDD supply.
Figure 7. Device Behavior during Normal Operation
INPUT
AVDD
UVLO-
BVDD
UVLO+
UVLO-
UVLO+
OUTPUT
tSTART tSTART tSTART tPHL tPLH
tSD
Si840x
14 Rev. 1.6
Not Recommended
for New Designs
3.3. Layout Recommendations
To ensure safety in the end user application, high voltage circuits (i.e., circuits with >30 VAC) must be physically
separated from the safety extra-low voltage circuits (SELV is a circuit with <30 VAC) by a certain distance
(creepage/clearance). If a component, such as a digital isolator, straddles this isolation barrier, it must meet those
creepage/clearance requirements and also provide a sufficiently large high-voltage breakdown protection rating
(commonly referred to as working voltage protection). Table 6 on page 9 and Table 7 on page 9 detail the working
voltage and creepage/clearance capabilities of the Si84xx. These tables also detail the component standards
(UL1577, IEC60747, CSA 5A), which are readily accepted by certification bodies to provide proof for end-system
specifications requirements. Refer to the end-system specification (61010-1, 60950-1, etc.) requirements before
starting any design that uses a digital isolator.
The following sections detail the recommended bypass and decoupling components necessary to ensure robust
overall performance and reliability for systems using the Si84xx digital isolators.
3.3.1. Supply Bypass
Digital integrated circuit components typically require 0.1 µF (100 nF) bypass capacitors when used in electrically
quiet environments. However, digital isolators are commonly used in hazardous environments with excessively
noisy power supplies. To counteract these harsh conditions, it is recommended that an additional 1 µF bypass
capacitor be added between VDD and GND on both sides of the package. The capacitors should be placed as
close as possible to the package to minimize stray inductance. If the system is excessively noisy, it is
recommended that the designer add 50 to 100 resistors in series with the VDD supply voltage source and 50 to
300 resistors in series with the digital inputs/outputs (see Figure 8). For more details, see "5.Errata and Design
Migration Guidelines" on page 22.
All components upstream or downstream of the isolator should be properly decoupled as well. If these components
are not properly decoupled, their supply noise can couple to the isolator inputs and outputs, potentially causing
damage if spikes exceed the maximum ratings of the isolator (6 V). In this case, the 50 to 300 resistors protect
the isolator's inputs/outputs (note that permanent device damage may occur if the absolute maximum ratings are
exceeded). Functional operation should be restricted to the conditions specified in Table 3, “Si8400/01/02/05
Electrical Characteristics for Bidirectional I2C Channels1,” on page 5. and Table 4, “Electrical Characteristics for
Unidirectional Non-I2C Digital Channels (Si8402/05),” on page 7
3.3.2. Pin Connections
No connect pins are not internally connected. They can be left floating, tied to VDD, or tied to GND.
3.3.3. Output Pin Termination
The nominal output impedance of an non-I2C isolator driver channel is approximately 85 , ±40%, which is a
combination of the value of the on-chip series termination resistor and channel resistance of the output driver FET.
When driving loads where transmission line effects will be a factor, output pins should be appropriately terminated
with controlled impedance PCB traces. The series termination resistor values should be scaled appropriately while
keeping in mind the recommendations described in “3.3.1. Supply Bypass” above.
Figure 8. Recommended Bypass Components for the Si84xx Digital Isolator Family
AVDD BVDD
AGND BGND
50 – 300 50 – 300
Input/OutputInput/Output
C2 C3
1 F1 F
R1 (50 – 100 )
V Source 1
Ax Bx
50 – 300
50 – 300
Ax Bx
C1
R2 (50 – 100 )
V Source 2
C4
0.1 F0.1 F
Si840x
Rev. 1.6 15
Not Recommended
for New Designs
3.4. Input and Output Characteristics for Non-I2C Digital Channels
The Si84xx inputs and outputs for unidirectional channels are standard CMOS drivers/receivers. The nominal
output impedance of an isolator driver channel is approximately 85 , ±40%, which is a combination of the value of
the on-chip series termination resistor and channel resistance of the output driver FET. When driving loads where
transmission line effects will be a factor, output pins should be appropriately terminated with controlled impedance
PCB traces. Table 12 details powered and unpowered operation of the Si84xx’s non-I2C digital channels.
Table 12. Si84xx Operation Table
VI Input1,2 VDDI State1,3,4 VDDO State1,3,4 VO Output1,2 Comments
HP P H
Normal operation.
LP P L
X5UPPL
6Upon transition of VDDI from unpowered to pow-
ered, VO returns to the same state as VI in less
than 1 µs.
X5P UP Undetermined
Upon transition of VDDO from unpowered to pow-
ered, VO returns to the same state as VI within
1µs.
Notes:
1. VDDI and VDDO are the input and output power supplies. VI and VO are the respective input and output terminals.
2. X = not applicable; H = Logic High; L = Logic Low.
3. Powered (P) state is defined as 3.0 V < VDD < 5.5 V.
4. Unpowered (UP) state is defined as VDD = 0 V.
5. Note that an I/O can power the die for a given side through an internal diode if its source has adequate current.
6. For I2C channels, the outputs for a given side go to Hi-Z when power is lost on the opposite side.
Si840x
16 Rev. 1.6
Not Recommended
for New Designs
3.5. Typical Performance Characteristics
The typical performance characteristics depicted in the following diagrams are for information purposes only. Refer
to Tables 2, 3, 4, and 5 for actual specification limits.
Figure 9. I2C Side A Pulling Down
(1100 Pull-Up)
Figure 10. I2C Side B Pulling Down
Figure 11. I2C Side B Pulling Up, Side A
Following
Figure 12. I2C Side A Pulling Up, Side B
Following
Figure 13. Non I2C Channel Propag ation Delay
vs. Te mperature
Side A Side B
Side B Side A
Side B Side A
Side B Side A
5
6
7
8
9
10
-40 -20 0 20 40 60 80 100 120
Temperature (Degrees C)
Dela y ( ns)
Rising Edge
Fa l li ng Edge
Si840x
Rev. 1.6 17
Not Recommended
for New Designs
Figure 14. Si84xx Time-Dependent Dielectric Breakdown
Si840x
18 Rev. 1.6
Not Recommended
for New Designs
4. Typical Application Overview
4.1. I2C Background
In many applications, I2C, SMBus, and PMBus interfaces require galvanic isolation for safety or ground loop
elimination. For example, Power over Ethernet (PoE) applications typically use an I2C interface for communication
between the PoE power sourcing device (PSE), and the earth ground referenced system controller. Galvanic
isolation is required both by standard and also as a practical matter to prevent ground loops in Ethernet connected
equipment.
The physical interface consists of two wires: serial data (SDA) and serial clock (SCL). These wires are connected
to open collector drivers that serve as both inputs and outputs. At first glance, it appears that SDA and SCL can be
isolated simply by placing two unidirectional isolators in parallel, and in opposite directions. However, this
technique creates feedback that latches the bus line low when a logic low asserted by either master or slave. This
problem can be remedied by adding anti-latch circuits, but results in a larger and more expensive solution. The
Si840x products offer a single-chip, anti-latch solution to the problem of isolating I2C/SMBus applications and
require no external components except the I2C/SMBus pull-up resistors. In addition, they provide isolation to a
maximum of 2.5 kVRMS, support I2C clock stretching, and operate to a maximum I2C bus speed of 1.7 Mbps.
4.2. I2C Isolator Operation
Without anti-latch protection, bidirectional I2C isolators latch when an isolator output logic low propagates back
through an adjacent isolator channel creating a stable latched low condition on both sides. Anti-latch protection is
typically added to one side of the isolator to avoid this condition (the “A” side for the Si8400/01/02/05).
The following examples illustrate typical circuit configurations using the Si8400/01/02/05.
Figure 15. Isolated Bus Overview (Bidirectional Channels)
The “A side” output low (VOL) and input low (VIL) levels are designed such that the isolator VOL is greater than the
isolator VIL to prevent the latch condition.
I2C/SMBus
Unit 1 Si8400/01/02/05
I2C/SMBus
Unit 2
ISO1
ISO2
VOL
VIL
+
-
VOL
VIL
A Side
B Side
Si840x
Rev. 1.6 19
Not Recommended
for New Designs
4.3. I2C Isolator Design Constraints
Table 13 lists the design constraints.
4.4. I2C Isolator Design Considerations
The first step in applying an I2C isolator is to choose which side of the bus will be connected to the isolator A side.
Ideally, it should be the side which:
1. Is compatible with the range of bus pull up specified by the manufacturer. For example, the Si8400/01/02/05
isolators are normally used with a pull up of 0.5 mA to 3 mA.
2. Has the highest input low level for devices on the bus. Some devices may specify an input low of 0.9 V and
other devices might require an input low of 0.3 x Vdd. Assuming a 3.3 V minimum power supply, the side with
an input low of 0.3 x Vdd is the better side because this side has an input low level of 1.0 V.
3. Have devices on the bus that can pull down below the isolator input low level. For example, the Si840x input
level is 0.45 V. As most CMOS devices can pull to within 0.4 V of GND this is generally not an issue.
4. Has the lowest noise. Due to the special logic levels, noise margins can be as low as 50 mV.
The Si840x isolators are not compatible with devices that have a logic low of 0.8 V. For this situation, a discrete
circuit can be used. See “AN352: Low-Cost, High-Speed I2C Isolation with Digital Isolators” for additional
information.
Table 13. Design Constraints
Design Cons tra int Data Sheet Value s Effect of Bus Pu ll-up Strength
and Temperature
To prevent the latch condition, the
isolator output low level must be
greater than the isolator input low
level.
Isolator VOL 0.8 V typical
Isolator VIL 0.6 V typical
Input/Output Logic Low Level
Difference
∆VSDA1, ∆VSCL1 = 50 mV minimum
This is normally guaranteed by the
isolator data sheet. However, if the
pull up strength is too weak, the out-
put low voltage will fall and can get
too close to the input low logic level.
These track over temperature.
The bus output low must be less
than the isolator input low logic
level.
Bus VOL =0.4V maximum
Isolator VIL = 0.45 V minimum
If the pull up strength is too large,
the devices on the bus might not pull
the voltage below the input low
range. These have opposite tem-
perature coefficients. Worst case is
hot temperature.
The isolator output low must be
less than the bus input low.
Bus VIL 0.3 x VDD = 1.0 V minimum for
VDD =3.3V
Isolator VOL = 0.825 V maximum,
(0.5 mA pullup, –10 to 125 °C)
If the pull up strength is too large,
the isolator might not pull below the
bus input low voltage.
Si8400/01/05 Vol: –1.8 mV/C
CMOS buffer: –0.6 mV/C
This provides some temperature
tracking, but worst case is cold tem-
perature.
Si840x
20 Rev. 1.6
Not Recommended
for New Designs
Figures 16, 17, 18, and 19 illustrate typical circuit configurations using the Si8400, Si8401, Si8402 and Si8405.
Figure 16. Typical Si8400 Application Diagram
Figure 17. Typical Si8401 Application Diagram
Figure 18. Typical Si8402 Application Diagram
1
2 7
Si8400
3
8
AVDD
ASDA
ASCL
AGND BGND
BSCL
BSDA
BVDD
3k 3k
0.1 µF
0.1 µF
3k 3k
I2C
Bus
6
5
4
1
2 7
Si8401
3
8
AVDD
ASDA
ASCL
AGND BGND
BSCL
BSDA
BVDD
3k 3k
0.1 µF
0.1 µF
3k
I2C
Bus
6
5
4
3k
1
2 7
Si8402
3
8
AVDD
ASDA
ASCL
AGND BGND
BSCL
BSDA
BVDD
3k0.1 µF
0.1 µF
3k
I2C
Bus
6
5
4
Si840x
Rev. 1.6 21
Not Recommended
for New Designs
Figure 19. Typical Si8405 Application Diagram
1
2
3
4
5
6
7
15
14
13
12
11
10
8 9
Si8405
3
16
AVDD
ASDA
ASCL
AGND
Micro-
controller
Micro-
controller
BGND
BSCL
BSDA
BVDD
3k 3k
0.1 µF
0.1 µF
3k 3k
I2C
Bus
RESET
INT
Si840x
22 Rev. 1.6
Not Recommended
for New Designs
5. Errata and Design Migration Guidelines
The following errata apply to Revision A devices only. See "7.Ordering Guide" on page 25 for more details. No
errata exist for Revision B devices.
5.1. Power Supply Bypass Capacitors (Revision A and Revision B)
When using the Si840x isolators with power supplies > 4.5 V, sufficient VDD bypass capacitors must be present on
both the VDD1 and VDD2 pins to ensure the VDD rise time is less than 0.5 V/µs (which is > 9 µs for a > 4.5 V
supply). Although rise time is power supply dependent, > 1 µF capacitors are required on both power supply pins
(VDD1, VDD2) of the isolator device.
5.1.1. Resolution
For recommendations on resolving this issue, see "3.3.1.Supply Bypass" on page 14. Additionally, refer to
"7.Ordering Guide" on page 25 for current ordering information.
Si840x
Rev. 1.6 23
Not Recommended
for New Designs
6. Pin Descriptions
Table 14. Si8400/01/02 in SO-8 Package
Pin Name Description
1 AVDD Side A power supply terminal; connect to a source of 3.0 to 5.5 V.
2 ASDA Side A data (open drain) input or output.
3 ASCL Side A clock input or output.
Open drain I/O for Si8400/01. Standard CMOS input for Si8402.
4 AGND Side A ground terminal.
5 BGND Side B ground terminal.
6 BSCL Side B clock input or output.
Open drain I/O for Si8400/01. Push-pull output for Si8402.
7 BSDA Side B data (open drain) input or output.
8 BVDD Side B power supply terminal; connect to a source of 3.0 to 5.5 V.
Bidirectional
Isolator Channel
Bidirectional
Isolator Channel
ASDA BSDA
ASCL BSCL
AGND BGND
AVDD BVDD
Si8400/01
1
2
3
4
8
7
6
5
Bidirectional
Isolator Channel
Unidirectional
Isolator Channel
ASDA BSDA
ASCL BSCL
AGND BGND
AVDD BVDD
Si8402
1
2
3
4
8
7
6
5
Si840x
24 Rev. 1.6
Not Recommended
for New Designs
Table 15. Si8405 in Narrow-Body SO-16 Package
Pin Name Description
1 AVDD Side A Power Supply Terminal. Connect to a source of 3.0 to 5.5 V.
2 NC No connection.
3 ASDA Side A Data (open drain) Input or Output.
4ADIN
Side A Standard CMOS Digital Input (non I2C).
5 ADOUT Side A Digital Push-Pull Output (non I2C).
6 ASCL Side A Clock (open drain) Input or Output.
7 NC No connection.
8 AGND Side A Ground Terminal.
9 BGND Side B Ground Terminal.
10 NC No connection.
11 BSCL Side B Clock (open drain) Input or Output.
12 BDIN Side B Standard CMOS Digital Input (non I2C).
13 BDOUT Side B Digital Push-Pull Output (non I2C).
14 BSDA Side B Data (open drain) Input or Output.
15 NC No connection.
16 BVDD Side B Power Supply Terminal. Connect to a source of 3.0 to 5.5 V.
Bidirectional
Isolator Channel
AVDD
NC
BVDD
NC
NC NC
ADOUT BDIN
ASDA BSDA
Unidirectional
Isolator Channel
ASCL BSCL
ADIN BDOUT
Si8405
AGND BGND
Unidirectional
Isolator Channel
Bidirectional
Isolator Channel
1
2
3
4
5
6
7
8
10
9
11
12
13
14
15
16
Si840x
Rev. 1.6 25
Not Recommended
for New Designs
7. Ordering Guide
These devices are not recommended for new designs. Please see the Si860x datasheet for replacement options.
Table 16. Ordering Guide1
Ordering Part
Number
(OPN)
Alternative Part
Number
(APN)
Number of
Bidirectional
I2C
Channels
Max I2C
Bus
Speed
(MHz)
Number of
Unidirectional
Channels
Max Data Rate
of Non-I2C
Unidirectional
Channels
(Mbps)
Isolation
Ratings Package
Revision B Devices2
Si8400AA-B-IS Si8600AB-B-IS 2 1.7 0 — 1 kVRMS NB SOIC-8
Si8400AB-B-IS Si8600AB-B-IS 2 1.7 0 — 2.5 kVRMS NB SOIC-8
Si8401AA-B-IS Si8602AB-B-IS 1 1.7 1 — 1 kVRMS NB SOIC-8
Si8401AB-B-IS Si8602AB-B-IS 1 1.7 1 — 2.5 kVRMS NB SOIC-8
Si8402AB-B-IS Si8602AB-B-IS 1 1.7 1 10 2.5 kVRMS NB SOIC-8
Si8405AA-B-IS1 Si8605AB-B-IS1 2 1.7 1 forward
1 reverse 10 1 kVRMS NB SOIC-16
Si8405AB-B-IS1 Si8605AB-B-IS1 2 1.7 1 forward
1 reverse 10 2.5 kVRMS NB SOIC-16
Revision A Devices2
Si8400AA-A-IS Si8600AB-B-IS 2 1.7 0 — 1 kVRMS NB SOIC-8
Si8400AB-A-IS Si8600AB-B-IS 2 1.7 0 — 2.5 kVRMS NB SOIC-8
Si8405AA-A-IS1 Si8605AB-B-IS1 2 1.7 1 forward
1 reverse 10 1 kVRMS NB SOIC-16
Si8405AB-A-IS1 Si8605AB-B-IS1 2 1.7 1 forward
1 reverse 10 2.5 kVRMS NB SOIC-16
Notes:
1. All packages are RoHS-compliant. Moisture sensitivity level is MSL2A with peak reflow temperature of 260 °C
according to the JEDEC industry standard classifications and peak solder temperature.
2. Revision A and Revision B devices are supported for existing designs.
Si840x
26 Rev. 1.6
Not Recommended
for New Designs
8. Package Outline: 8-Pin Narrow Body SOIC
Figure 20 illustrates the package details for the Si840x in an 8-pin SOIC (SO-8). Table 17 lists the values for the
dimensions shown in the illustration.
Figure 20. 8-pin Small Outline Integrated Circuit (SOIC) Package
Table 17. Package Diagram Dimensions
Symbol Millimeters
Min Max
A 1.35 1.75
A1 0.10 0.25
A2 1.40 REF 1.55 REF
B 0.33 0.51
C 0.19 0.25
D 4.80 5.00
E 3.80 4.00
e 1.27 BSC
H 5.80 6.20
h 0.25 0.50
L 0.40 1.27
08
Si840x
Rev. 1.6 27
Not Recommended
for New Designs
9. Land Pattern: 8-Pin Narrow Body SOIC
Figure 21 illustrates the recommended land pattern details for the Si840x in an 8-pin narrow-body SOIC. Table 18
lists the values for the dimensions shown in the illustration.
Figure 21. PCB Land Pattern: 8-Pin Narrow Body SOIC
Table 18. PCM Land Pattern Dimensions (8-Pin Narrow Body SOIC)
Dimension Feature (mm)
C1 Pad Column Spacing 5.40
E Pad Row Pitch 1.27
X1 Pad Width 0.60
Y1 Pad Length 1.55
Notes:
1. This Land Pattern Design is based on IPC-7351 pattern SOIC127P600X173-8N for
Density Level B (Median Land Protrusion).
2. All feature sizes shown are at Maximum Material Condition (MMC) and a card
fabrication tolerance of 0.05 mm is assumed.
Si840x
28 Rev. 1.6
Not Recommended
for New Designs
10. Package Outline: 16-Pin Narrow Body SOIC
Figure 22 illustrates the package details for the Si840x in a 16-pin narrow-body SOIC (SO-16). Table 19 lists the
values for the dimensions shown in the illustration.
Figure 22. 16-pin Small Outline Integrated Circuit (SOIC) Package
Table 19. Package Diagram Dimensions
Dimension Min Max
A — 1.75
A1 0.10 0.25
A2 1.25 —
b 0.31 0.51
c 0.17 0.25
D 9.90 BSC
E 6.00 BSC
E1 3.90 BSC
e 1.27 BSC
L 0.40 1.27
L2 0.25 BSC
Si840x
Rev. 1.6 29
Not Recommended
for New Designs
h 0.25 0.50
θ0° 8°
aaa 0.10
bbb 0.20
ccc 0.10
ddd 0.25
Notes:
1. All dimensions shown are in millimeters (mm) unless otherwise noted.
2. Dimensioning and Tolerancing per ANSI Y14.5M-1994.
3. This drawing conforms to the JEDEC Solid State Outline MS-012,
Variation AC.
4. Recommended card reflow profile is per the JEDEC/IPC J-STD-020
specification for Small Body Components.
Table 19. Package Diagram Dimensions (Continued)
Dimension Min Max
Si840x
30 Rev. 1.6
Not Recommended
for New Designs
11. Land Pattern: 16-Pin Narrow Body SOIC
Figure 23 illustrates the recommended land pattern details for the Si840x in a 16-pin narrow-body SOIC. Table 20
lists the values for the dimensions shown in the illustration.
Figure 23. 16-Pin Narrow Body SOIC PCB Land Pattern
Table 20. 16-Pin Narrow Body SOIC Land Pattern Dimensions
Dimension Feature (mm)
C1 Pad Column Spacing 5.40
E Pad Row Pitch 1.27
X1 Pad Width 0.60
Y1 Pad Length 1.55
Notes:
1. This Land Pattern Design is based on IPC-7351 pattern SOIC127P600X165-16N
for Density Level B (Median Land Protrusion).
2. All feature sizes shown are at Maximum Material Condition (MMC) and a card
fabrication tolerance of 0.05 mm is assumed.
Si840x
Rev. 1.6 31
Not Recommended
for New Designs
12. Top Marking: 8-Pin Narrow Body SOIC
12.1. 8-Pin Narrow Body SOIC Top Marking
12.2. Top Marking Explanation
Line 1 Marking: Base Part Number
Ordering Options
(See Ordering Guide for more
information).
Si84 = Isolator I2C Product Series:
XY = Channel Configuration
00 = Bidirectional SCL and SDA channels
01/02 = Bidirectional SDA channel;
Unidirectional SCL channel
S = Speed Grade
A=1.7Mbps
V = Isolation rating
A=1kV; B=2.5kV
Line 2 Marking: YY = Year
WW = Work week
Assigned by assembly contractor. Corresponds to the
year and work week of the mold date.
R = Product Rev
F=Wafer Fab
First two characters of the manufacturing code from
Assembly.
Line 3 Marking: Circle = 1.1 mm Diameter
Left-Justified
“e3” Pb-Free Symbol
A = Assembly Site
I = Internal Code
XX = Serial Lot Number
Last four characters of the manufacturing code from
assembly.
Si84XYSV
YYWWRF
AIXX
e3
Si840x
32 Rev. 1.6
Not Recommended
for New Designs
13. Top Marking: 16-Pin Narrow Body SOIC
13.1. 16-Pin Narrow Body SOIC Top Marking
13.2. Top Marking Explanation
Line 1 Marking: Base Part Number
Ordering Options
Si84 = Isolator product series
XY = Channel Configuration
05 = Bidirectional SCL, SDA; 1- forward and 1-reverse
unidirectional channel
S = Speed Grade
A=1.7Mbps
V = Isolation rating
A=1kV; B=2.5kV
Line 2 Marking: Circle = 1.2 mm Diameter “e3” Pb-Free Symbol
YY = Year
WW = Work Week
Assigned by the Assembly House. Corresponds to the
year and work week of the mold date.
TTTTTT = Mfg code Manufacturing Code from Assembly Purchase Order
form.
Circle = 1.2 mm diameter “e3” Pb-Free Symbol.
Si84XYSV
YYWWTTTTTT
e3
Si840x
Rev. 1.6 33
Not Recommended
for New Designs
DOCUMENT CHANGE LIST
Revision 0.1 to Revision 1.0
Updated document to reflect availability of Revision
B silicon.
Updated Tables 2, 3, 4, and 5.
Updated all supply currents and timing parameters.
Revised logic low output voltage specifications in
Table 3.
Updated Table 1.
Updated absolute maximum supply voltage.
Updated Table 7.
Updated clearance and creepage dimensions.
Updated "5.Errata and Design Migration Guidelines"
on page 22.
Updated "7.Ordering Guide" on page 25.
Revision 1.0 to Revision 1.1
Updated Table 4.
Updated Note 1 to reflect output impedance of 85 .
Updated rise and fall time specifications.
Updated Table 5.
Updated CMTI value.
Updated “7. Ordering Guide”.
Added Si8401 device configuration throughout
document.
Revision 1.1 to Revision 1.2
Updated document throughout to include MSL
improvements to MSL2A.
Updated "7.Ordering Guide" on page 25.
Updated Note 1 in ordering guide table to reflect
improvement and compliance to MSL2A moisture
sensitivity level.
Revision 1.2 to Revision 1.3
Added Si8402 throughout document. Clarified
description of Si8401’s BSCL pin to indicate pin type
is an open output, whereas the Si8402’s BSCL pin is
a push-pull CMOS pin.
Updated "7.Ordering Guide" on page 25 to include
Si8402.
Moved Table 1 to page 4.
Updated Tables 6, 7, 8, and 9.
Updated Table 12 footnotes.
Added Figure 14, “Si84xx Time-Dependent
Dielectric Breakdown,” on page 17.
Added Figure 18, “Typical Si8402 Application
Diagram,” on page 20.
Revision 1.3 to Revision 1.4
Updated "3.3.1.Supply Bypass" on page 14.
Added Figure 8, “Recommended Bypass
Components for the Si84xx Digital Isolator Family,”
on page 14.
Updated "5.1.Power Supply Bypass Capacitors
(Revision A and Revision B)" on page 22.
Revision 1.4 to Revision 1.5
Updated "7.Ordering Guide" on page 25 to include
new title note and “ Alternative Part Number (APN)”
column.
Revision 1.5 to Revision 1.6
Updated part numbers on page 1 and in pin
descriptions images.
Si840x
34 Rev. 1.6
Not Recommended
for New Designs
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Si8400AA-B-IS Si8400AB-B-IS Si8405AA-B-IS1 Si8405AB-B-IS1 SI8400AA-B-ISR SI8400AB-B-ISR SI8405AA-B-
IS1R SI8405AB-B-IS1R SI8401AA-B-ISR SI8401AB-B-ISR Si8405AA-A-IS1 Si8405AB-A-IS1 Si8405AB-A-IS1R
Si8400AB-A-IS Si8405AA-A-IS1R Si8400AA-A-IS Si8400AA-A-ISR Si8400AB-A-ISR Si8401AA-B-IS Si8401AB-B-IS
Si8402AB-B-IS Si8402AB-B-ISR SI8402AB-B-IS SI8400AB-A-ISR SI8405AA-A-IS1 SI8405AB-A-IS1R SI8400AB-
A-IS SI8400AA-A-IS SI8405AA-B-IS1 SI8405AB-A-IS1 SI8405AB-B-IS1 SI8400AA-B-IS SI8401AB-B-IS SI8401AA-
B-IS SI8400AB-B-IS SI8402AB-B-ISR
