MAX3221
3-V TO 5.5-V MULTICHANNEL RS-232 LINE DRIVER/RECEIVER
SLLS348B – JUNE 1999 – REVISED JANUARY 2000
1
POST OFFICE BOX 655303 DALLAS, TEXAS 75265
D
Meets or Exceeds the Requirements of
TIA/EIA-232-F and ITU v.28 Standards
D
Operates With 3-V to 5.5-V VCC Supply
D
Operates up to 250 kbit/s
D
Low Standby Current ...1 µA Typical
D
External Capacitors ...4 × 0.1 µF
D
Accepts 5-V Logic Input With 3.3-V Supply
D
Designed to Be Interchangeable With
Maxim MAX3221
D
RS-232 Bus-Pin ESD Protection Exceeds
±15-kV Using Human-Body Model (HBM)
D
Applications
– Battery-Powered Systems, PDAs,
Notebooks, Laptops, Palmtop PCs, and
Hand-Held Equipment
D
Package Options Include Plastic Shrink
Small-Outline (DB) and Thin Shrink
Small-Outline (PW) Packages
description
The MAX3221 device consists of one line driver , one line receiver , and a dual charge-pump circuit with ±15-kV
ESD protection pin to pin (serial-port connection pins, including GND). The device meets the requirements of
TIA/EIA-232-F and provides the electrical interface between an asynchronous communication controller and
the serial-port connector. The charge pump and four small external capacitors allow operation from a single 3-V
to 5.5-V supply. These devices operate at data signaling rates up to 250 kbit/s, and at a maximum of 30-V/µs
driver output slew rate.
Flexible control options for power management are available when the serial port is inactive. The
auto-powerdown feature functions when FORCEON is low and FORCEOFF is high. During this mode of
operation, if the device does not sense a valid RS-232 signal, the driver outputs are disabled. If FORCEOFF
is set low and EN is high, both drivers and receivers are shut off, and the supply current is reduced to 1 µA.
Disconnecting the serial port or turning off the peripheral drivers causes the auto-powerdown condition to occur.
Auto-powerdown can be disabled when FORCEON and FORCEOFF are high. With auto-powerdown enabled,
the device is activated automatically when a valid signal is applied to any receiver input. The INVALID output
notifies the user if an RS-232 signal is present at any receiver input. INV ALID is high (valid data) if any receiver
input voltage is greater than 2.7 V or less than –2.7 V, or has been between –0.3 V and 0.3 V for less than 30
µs. INVALID is low (invalid data) if the receiver input voltage is between –0.3 V and 0.3 V for more than 30 µs.
Refer to Figure 5 for receiver input levels.
The MAX3221C is characterized for operation from 0°C to 70°C. The MAX3221I is characterized for operation
from –40°C to 85°C.
PRODUCT PREVIEW
Copyright 2000, Texas Instruments Incorporated
PRODUCT PREVIEW information concerns products in the formative or
design phase of development. Characteristic data and other
specifications are design goals. Texas Instruments reserves the right to
change or discontinue these products without notice.
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
DB OR PW PACKAGE
(TOP VIEW)
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
EN
C1+
V+
C1–
C2+
C2–
V–
RIN
FORCEOFF
VCC
GND
DOUT
FORCEON
DIN
INVALID
ROUT
MAX3221
3-V TO 5.5-V MULTICHANNEL RS-232 LINE DRIVER/RECEIVER
SLLS348B – JUNE 1999 – REVISED JANUARY 2000
2POST OFFICE BOX 655303 DALLAS, TEXAS 75265
AVAILABLE OPTIONS
PACKAGED DEVICES
TASHRINK
SMALL OUTLINE
(DB)
THIN SHRINK
SMALL OUTLINE
(PW)
0°C to 70°C MAX3221CDB MAX3221CPW
–40°C to 85°C MAX3221IDB MAX3221IPW
The DB and PW packages are available taped and reeled. Add
the suffix R to device type (e.g., MAX3221CDBR).
Function Tables
EACH DRIVER
INPUTS
OUTPUT
DIN FORCEON FORCEOFF VALID RIN
RS-232 LEVEL
OUTPUT
DOUT DRIVER STATUS
X X L X Z Powered off
L H H X H Normal operation with
HHH XLauto-powerdown disabled
L L H Yes HNormal operation with
HLHYesLauto-powerdown enabled
L L H No Z Powered off by
H L H No Z
y
auto-powerdown feature
H = high level, L = low level, X = irrelevant, Z = high impedance
EACH RECEIVER
INPUTS
OUTPUT
RIN EN VALID RIN
RS-232 LEVEL
OUTPUT
ROUT
L L X H
HLX L
XHX Z
Open L No H
H = high level, L = low level, X = irrelevant,
Z = high impedance (off), Open = disconnected
input or connected driver of f
logic diagram (positive logic)
DIN DOUT
Auto-powerdown INVALID
RIN
FORCEOFF
FORCEON
ROUT
EN
11
16
9
13
10
8
1
12
PRODUCT PREVIEW
MAX3221
3-V TO 5.5-V MULTICHANNEL RS-232 LINE DRIVER/RECEIVER
SLLS348B – JUNE 1999 – REVISED JANUARY 2000
3
POST OFFICE BOX 655303 DALLAS, TEXAS 75265
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)
Supply voltage range, VCC (see Note 1) 0.3 V to 6 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Positive output supply voltage range, V+ (see Note 1) 0.3 V to 7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Negative output supply voltage range, V– (see Note 1) 0.3 V to –7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Supply voltage difference, V+ V– (see Note 1) 13 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Input voltage range, VI: Driver (FORCEOFF, FORCEON, EN) 0.3 V to 6 V. . . . . . . . . . . . . . . . . . . . . . . . . . .
Receiver 25 V to 25 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Output voltage range, VO: Driver –13.2 V to 13.2 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Receiver (INVALID) 0.3 V to VCC + 0.3 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Package thermal impedance, θJA (see Note 2): DB package 82°C/W. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
PW package 108°C/W. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds 260°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Storage temperature range, Tstg –65°C to 150°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only , and
functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not
implied. Exposure to absolute-maximum-rated conditions for extended periods may af fect device reliability.
NOTES: 1. All voltages are with respect to network GND.
2. The package thermal impedance is calculated in accordance with JESD 51.
recommended operating conditions (see Note 3 and Figure 6)
MIN NOM MAX UNIT
Su
pp
ly voltage
VCC = 3.3 V 3 3.3 3.6
V
S
u
ppl
y v
oltage
VCC = 5 V 4.5 5 5.5
V
VIH
Driver and control high level in
p
ut voltage
DIN, FORCEOFF, FORCEON, VCC = 3.3 V 2
V
V
IH
Dri
v
er
and
control
high
-
le
v
el
inp
u
t
v
oltage
,,,
EN VCC = 5 V 2.4
V
VIL Driver and control low-level input voltage DIN, FORCEOFF, FORCEON, EN 0.8 V
VIDriver and control input voltage DIN, FORCEOFF, FORCEON 0 5.5 V
VIReceiver input voltage –25 25 V
TA
O
p
erating free-air tem
p
erature
MAX3221C 0 70 °
C
TA
O erating
free
-
air
tem erature
MAX3221I –40 85
°C
NOTE 3: Test conditions are C1–C4 = 0.1 µF at VCC = 3.3 V ±0.3 V; C1 = 0.047 µF, C2–C4 = 0.33 µF at VCC = 5 V ±0.5 V.
electrical characteristics over recommended ranges of supply voltage and operating free-air
temperature (unless otherwise noted) (see Note 3 and Figure 6)
PARAMETER TEST CONDITIONS MIN TYPMAX UNIT
IIInput leakage current FORCEOFF, FORCEON, EN ±0.01 ±1µA
Auto-powerdown disabled No load,
FORCEOFF and FORCEON at VCC 0.3 1 mA
ICC
Su
pp
ly current
Powered off No load, FORCEOFF at GND 1 10
ICC
Su ly
current
Auto-powerdown enabled No load, FORCEOFF at VCC,
FORCEON at GND,
All RIN are open or grounded 1 10 µA
All typical values are at VCC = 3.3 V or VCC = 5 V, and TA = 25°C.
NOTE 3: Test conditions are C1–C4 = 0.1 µF at VCC = 3.3 V ±0.3 V; C1 = 0.047 µF, C2–C4 = 0.33 µF at VCC = 5 V ±0.5 V.
PRODUCT PREVIEW
MAX3221
3-V TO 5.5-V MULTICHANNEL RS-232 LINE DRIVER/RECEIVER
SLLS348B – JUNE 1999 – REVISED JANUARY 2000
4POST OFFICE BOX 655303 DALLAS, TEXAS 75265
DRIVER SECTION
electrical characteristics over recommended ranges of supply voltage and operating free-air
temperature (unless otherwise noted) (see Note 3 and Figure 6)
PARAMETER TEST CONDITIONS MIN TYPMAX UNIT
VOH High-level output voltage DOUT at RL = 3 kto GND, DIN = GND 5 5.4 V
VOL Low-level output voltage DOUT at RL = 3 kto GND, DIN = VCC –5 –5.4 V
IIH High-level input current VI = VCC ±0.01 ±1µA
IIL Low-level input current VI at GND ±0.01 ±1µA
IOS
VCC = 3.6 V, VO = 0 V
±35
±60
mA
I
OS
ort-c
rcu
t output current
VCC = 5.5 V, VO = 0 V
±35
±60
mA
roOutput resistance VCC, V+, and V– = 0 V, VO = ±2 V 300 10M
Ioff Output leakage current FORCEOFF = GND, VO = ±12 V, VCC = 0 to 5.5 V ±25 µA
All typical values are at VCC = 3.3 V or VCC = 5 V, and TA = 25°C.
Short-circuit durations should be controlled to prevent exceeding the device absolute power dissipation ratings, and not more than one output
should be shorted at a time.
NOTE 3: Test conditions are C1–C4 = 0.1 µF at VCC = 3.3 V ±0.3 V; C1 = 0.047 µF, C2–C4 = 0.33 µF at VCC = 5 V ±0.5 V.
switching characteristics over recommended ranges of supply voltage and operating free-air
temperature (unless otherwise noted) (see Note 3 and Figure 6)
PARAMETER TEST CONDITIONS MIN TYPMAX UNIT
Maximum data rate CL = 1000 pF, RL = 3 kΩ, See Figure 1 250 kbit/s
tsk(p) Pulse skew§CL = 150 pF to 2500 pF RL = 3 k to 7 k
See Figure 2 100 ns
SR(tr)
Slew rate, transition region VCC = 3.3 V,CL = 150 pF to 1000 pF 6 30
V/µs
SR(tr)
g
(see Figure 1)
CC
RL = 3 k to 7 kCL = 150 pF to 2500 pF 4 30
V/
µ
s
All typical values are at VCC = 3.3 V or VCC = 5 V, and TA = 25°C.
§Pulse skew is defined as |tPLH – tPHL| of each channel of the same device.
NOTE 3: Test conditions are C1–C4 = 0.1 µF at VCC = 3.3 V ±0.3 V; C1 = 0.047 µF, C2–C4 = 0.33 µF at VCC = 5 V ±0.5 V.
PRODUCT PREVIEW
MAX3221
3-V TO 5.5-V MULTICHANNEL RS-232 LINE DRIVER/RECEIVER
SLLS348B – JUNE 1999 – REVISED JANUARY 2000
5
POST OFFICE BOX 655303 DALLAS, TEXAS 75265
RECEIVER SECTION
electrical characteristics over recommended ranges of supply voltage and operating free-air
temperature (unless otherwise noted) (see Note 3 and Figure 6)
PARAMETER TEST CONDITIONS MIN TYPMAX UNIT
VOH High-level output voltage IOH = –1 mA VCC – 0.6 V VCC – 0.1 V V
VOL Low-level output voltage IOL = 1.6 mA 0.4 V
VIT
Positive going in
p
ut threshold voltage
VCC = 3.3 V 1.6 2.4
V
V
IT+
Positi
v
e
-
going
inp
u
t
threshold
v
oltage
VCC = 5 V 1.9 2.4
V
VIT
Negative going in
p
ut threshold voltage
VCC = 3.3 V 0.6 1.1
V
V
IT–
Negati
v
e
-
going
inp
u
t
threshold
v
oltage
VCC = 5 V 0.8 1.4
V
Vhys Input hysteresis (VIT+ – VIT–) 0.5 V
Ioff Output leakage current FORCEOFF = 0 V ±0.05 ±10 µA
riInput resistance VI = ±3 V to ±25 V 3 5 7 k
All typical values are at VCC = 3.3 V or VCC = 5 V, and TA = 25°C.
NOTE 3: Test conditions are C1–C4 = 0.1 µF at VCC = 3.3 V ±0.3 V; C1 = 0.047 µF, C2–C4 = 0.33 µF at VCC = 5 V ±0.5 V.
switching characteristics over recommended ranges of supply voltage and operating free-air
temperature (unless otherwise noted) (see Note 3)
PARAMETER TEST CONDITIONS MIN TYPMAX UNIT
tPLH Propagation delay time, low- to high-level output
CL= 150
p
F See Figure 3
150 ns
tPHL Propagation delay time, high- to low-level output
C
L =
150
pF
,
See
Fig
u
re
3
150 ns
ten Output enable time
CL= 150
p
FR
L=3kSee Figure 4
200 ns
tdis Output disable time
C
L =
150
pF
,
R
L =
3
k
,
See
Fig
u
re
4
200 ns
tsk(p) Pulse skewSee Figure 3 50 ns
All typical values are at VCC = 3.3 V or VCC = 5 V, and TA = 25°C.
Pulse skew is defined as |tPLH – tPHL| of each channel of the same device.
NOTE 3: Test conditions are C1–C4 = 0.1 µF at VCC = 3.3 V ±0.3 V; C1 = 0.047 µF, C2–C4 = 0.33 µF at VCC = 5 V ±0.5 V.
PRODUCT PREVIEW
MAX3221
3-V TO 5.5-V MULTICHANNEL RS-232 LINE DRIVER/RECEIVER
SLLS348B – JUNE 1999 – REVISED JANUARY 2000
6POST OFFICE BOX 655303 DALLAS, TEXAS 75265
AUTO-POWERDOWN SECTION
electrical characteristics over recommended ranges of supply voltage and operating free-air
temperature (unless otherwise noted) (see Figure 5)
PARAMETER TEST CONDITIONS MIN TYPMAX UNIT
VT+(valid) Receiver input threshold
for INVALID high-level output voltage FORCEON = GND,
FORCEOFF = VCC 2.7 V
VT–(valid) Receiver input threshold
for INVALID high-level output voltage FORCEON = GND,
FORCEOFF = VCC –2.7 V
VT(invalid) Receiver input threshold
for (INVALID) low-level output voltage FORCEON = GND,
FORCEOFF = VCC –0.3 0.3 V
VOH INVALID high-level output voltage IOH = –1 mA, FORCEON = GND,
FORCEOFF = VCC VCC – 0.6 V
VOL INVALID low-level output voltage IOL = 1.6 mA, FORCEON = GND,
FORCEOFF = VCC 0.4 V
All typical values are at VCC = 3.3 V or VCC = 5 V, and TA = 25°C.
switching characteristics over recommended ranges of supply voltage and operating free-air
temperature (unless otherwise noted) (see Figure 5)
PARAMETER MIN TYPMAX UNIT
tvalid Propagation delay time, low- to high-level output 1µs
tinvalid Propagation delay time, high- to low-level output 30 µs
ten Supply enable time 100 µs
All typical values are at VCC = 3.3 V or VCC = 5 V, and TA = 25°C.
PRODUCT PREVIEW
MAX3221
3-V TO 5.5-V MULTICHANNEL RS-232 LINE DRIVER/RECEIVER
SLLS348B – JUNE 1999 – REVISED JANUARY 2000
7
POST OFFICE BOX 655303 DALLAS, TEXAS 75265
PARAMETER MEASUREMENT INFORMATION
50
TEST CIRCUIT VOLTAGE W AVEFORMS
–3 V
–3 V
3 V
3 V
0 V
3 V
Output
Input
VOL
VOH
tTLH
Generator
(see Note B) RL
3 V
FORCEOFF
RS-232
Output
tTHL
CL
(see Note A)
SR(tr)
+
6V
tTHL or tTLH
NOTES: A. CL includes probe and jig capacitance.
B. The pulse generator has the following characteristics: PRR = 250 kbit/s, ZO = 50 , 50% duty cycle, tr 10 ns, tf 10 ns.
Figure 1. Driver Slew Rate
50
TEST CIRCUIT VOLTAGE W AVEFORMS
0 V
3 V
Output
Input
VOL
VOH
tPLH
Generator
(see Note B) RL
3 V
FORCEOFF
RS-232
Output
tPHL
CL
(see Note A)
NOTES: A. CL includes probe and jig capacitance.
B. The pulse generator has the following characteristics: PRR = 250 kbit/s, ZO = 50 , 50% duty cycle, tr 10 ns, tf 10 ns.
50% 50%
1.5 V 1.5 V
Figure 2. Driver Pulse Skew
TEST CIRCUIT VOLTAGE WAVEFORMS
50
–3 V
3 V
Output
Input
VOL
VOH
tPHL
Generator
(see Note B) tPLH
Output
CL
(see Note A)
3 V or 0 V
FORCEON
NOTES: A. CL includes probe and jig capacitance.
B. The pulse generator has the following characteristics: ZO = 50 , 50% duty cycle, tr 10 ns, tf 10 ns.
3 V
FORCEOFF
1.5 V 1.5 V
50% 50%
Figure 3. Receiver Propagation Delay Times
PRODUCT PREVIEW
MAX3221
3-V TO 5.5-V MULTICHANNEL RS-232 LINE DRIVER/RECEIVER
SLLS348B – JUNE 1999 – REVISED JANUARY 2000
8POST OFFICE BOX 655303 DALLAS, TEXAS 75265
PARAMETER MEASUREMENT INFORMATION
TEST CIRCUIT VOLTAGE WAVEFORMS
50
Generator
(see Note B)
3 V or 0 V Output
VOL
VOH
tPZH
(S1 at GND)
3 V
–3 V
0.3 V
Output
Input
0.3 V
3 V or 0 V
FORCEON
EN
NOTES: A. CL includes probe and jig capacitance.
B. The pulse generator has the following characteristics: ZO = 50 , 50% duty cycle, tr 10 ns, tf 10 ns.
C. tPLZ and tPHZ are the same as tdis.
D. tPZL and tPZH are the same as ten.
1.5 V 1.5 V
50%
tPHZ
(S1 at GND)
tPLZ
(S1 at VCC)
50%
tPZL
(S1 at VCC)
RL
S1
VCC GND
CL
(see Note A)
Output
Figure 4. Receiver Enable and Disable Times
PRODUCT PREVIEW
MAX3221
3-V TO 5.5-V MULTICHANNEL RS-232 LINE DRIVER/RECEIVER
SLLS348B – JUNE 1999 – REVISED JANUARY 2000
9
POST OFFICE BOX 655303 DALLAS, TEXAS 75265
PARAMETER MEASUREMENT INFORMATION
TEST CIRCUIT
50
Generator
(see Note B)
FORCEOFF
ROUT
FORCEON
Auto-
powerdown INVALID
DOUTDIN
CL = 30 pF
(see Note A)
ÎÎÎÎÎÎÎÎÎÎÎÎ
ÎÎÎÎÎÎÎÎÎÎÎÎ
ÎÎÎÎÎÎÎÎÎÎÎÎ
ÎÎÎÎÎÎÎÎÎÎÎÎ
ÎÎÎÎÎÎÎÎÎÎÎÎ
ÎÎÎÎÎÎÎÎÎÎÎÎ
2.7 V
–2.7 V
0.3 V
–0.3 V
0 V
Valid RS-232 Level, INVALID High
Indeterminate
Indeterminate
If Signal Remains Within This Region
For More Than 30 µs, INVALID Is Low
Valid RS-232 Level, INVALID High
Auto-powerdown disables drivers and reduces supply
current to 1 µA.
NOTES: A. CL includes probe and jig capacitance.
B. The pulse generator has the following characteristics: PRR = 5 kbit/s, ZO = 50 , 50% duty cycle, tr 10 ns, tf 10 ns.
VOLTAGE WAVEFORMS
3 V
2.7 V
–2.7 V
INVALID
Output
Receiver
Input
tvalid
0 V
0 V
–3 V
VCC
0 V
V+
0 V
V–
V+
VCC
ten
V–
50% VCC 50% VCC
2.7 V
–2.7 V
0.3 V
0.3 V
tinvalid
Supply
Voltages
Figure 5. INVALID Propagation Delay Times and Driver Enabling Time
PRODUCT PREVIEW
MAX3221
3-V TO 5.5-V MULTICHANNEL RS-232 LINE DRIVER/RECEIVER
SLLS348B – JUNE 1999 – REVISED JANUARY 2000
10 POST OFFICE BOX 655303 DALLAS, TEXAS 75265
APPLICATION INFORMATION
CBYPASS = 0.1 µF
Auto-
powerdown
VCC C1 C2, C3, and C4
3.3 V ± 0.3 V
5 V ± 0.5 V
3 V to 5.5 V
0.1 µF
0.047 µF
0.1 µF
0.1 µF
0.33 µF
0.47 µF
VCC vs CAPACITOR VALUES
FORCEOFF
+
+
+
+
+
1
8
2
3
5
6
7
4
16
13
12
11
10
9
15
14
VCC
GND
C1+
V+
C2+
C1–
C2–
V–
DOUT
FORCEON
DIN
INVALID
ROUT
EN
RIN
C1
C2
C4
5 k
C3
C3 can be connected to VCC or GND.
NOTE A: Resistor values shown are nominal.
Figure 6. Typical Operating Circuit and Capacitor Values
PRODUCT PREVIEW
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Copyright 2000, Texas Instruments Incorporated