ADM5180
FUNCTIONAL BLOCK DIAGRAM
REV. 0
FEATURES
Eight Differential Line Receivers in One Package
Meets EIA Standard EIA-232E, 423A, 422A and
CCITT V.10, V.11, V.28
Single +5 V Supply
Differential Inputs Withstand ±25 V
Internal Hysteresis
Low Power CMOS –3.5 mA Supply Current
TTL/CMOS Compatible Outputs
Available in 28-Pin DIP and PLCC Packages
Low Power Replacement for UC5180C/NE5180
APPLICATIONS
High Speed Communication
Computer I-O Ports
Peripherals
High Speed Modems
Printers
Logic Level Translation
One Technology Way, P.O. Box 9106, Norwood. MA 02062-9106, U.S.A.
Tel: 617/329-4700 Fax: 617/326-8703
a
Information furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assumed by Analog Devices for its
use, nor for any infringements of patents or other rights of third parties
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
Octal, RS-232/RS-423 Line Receiver
GENERAL DESCRIPTION
The ADM5180 is an octal differential line receiver suitable for a
wide range of digital communication systems with data rates up to
200 kB/s. Input signals conforming to EIA Standards 232-E, 422A
and CCITT V.10, V.11, V.28, X.26, and X.27 are accepted and
translated into TTL /CMOS output signal levels.
The ADM5180 is a superior upgrade for the UC5180C and the
NE5180. It is fabricated on an advanced BiCMOS process,
allowing high speed bipolar circuitry to be combined with low
power CMOS. This minimizes the power consumption to less than
25 mW.
A failsafe function ensures a known output state under a variety of
input fault conditions as defined in RS-422A and RS-423A. The
failsafe function is controlled by FS1 and FS2. Each controls four
receivers. With FS = Low and a fault condition the output is forced
low while if FS = High, the output is forced high.
The device is available in both 28-pin DIP and 28-lead PLCC
packages.
Truth Table
Differential Input Failsafe Input Receiver
(+) - (–) FS1, FS2 Logic Output
>200 mV X H
<–200 mV X L
O/C L L
S/C L L
O/C H H
S/C H H
A
B
C
D
E
F
G
H
A–
A+
B–
B+
C–
C+
D–
D+
E–
E+
F–
F+
G–
G+
H–
H+
A
O
B
O
C
O
D
O
E
O
F
O
G
O
H
O
FS1
FS2
ADM5180
Parameter Min Typ Max Units Test Conditions/Comments
POWER REQUIREMENTS
V
DD
4.75 5.25 V
I
DD
3.5 5 mA
INPUTS
Input Resistance, R
IN
37kΩ3 V ≤|V
IN
|≤ 25 V
Differential Input High Threshold, V
TH
50 200 mV R
S
= 0 Ω, V
OUT
= 2.7 V, I
OUT
= –440 µA, See Figure 1
400 mV R
S
= 500 Ω, V
OUT
= 2.7 V, I
OUT
= –440 µA, See Figure 1
Differential Input Low Threshold, V
TL
–200 –50 mV R
S
= 0 Ω, V
OUT
= 0.45 V, I
OUT
= 8 mA, See Figure 1
–400 mV R
S
= 500 Ω, V
OUT
= 0.45 V, I
OUT
= 8 mA, See Figure 1
Hysteresis, V
H
50 140 mV FS1, FS2 = 0 V or V
DD
, See Figure 1
Open Circuit Input Voltage, V
IOC
60 mV
Input Capacitance 20 pF
Input Current, I
IN
3.25 mA V
IN
= +10 V
–3.25 mA V
IN
= –10 V
OUTPUTS
High Level Output Voltage,V
OH
2.7 V V
ID
= 1.0 V, I
OUT
= –440 µA
Low Level Output Voltage ,V
OL
0.4 V V
ID
= –1.0 V, I
OUT
= 4 mA
0.45 V V
ID
= –1.0 V, I
OUT
= 8 mA, T
A
= 0ºC to +70ºC
Short Circuit O/P Current, I
OS
100 mA Note 1
FAILSAFE FUNCTION
Failsafe Output Voltage, V
OFS
Inputs Open or Shorted Together or One Input Open
and One Grounded
0.40 V 0 ≤ I
OUT
≤ 4 mA; FS1, FS2 = 0 V
0.45 V 0 ≤ I
OUT
≤ 8 mA, T
A
= 0ºC to +70ºC; FS1, FS2 = 0 V
2.7 V 0 ≥ I
OUT
≥ –400 µA; FS1, FS2 = V
DD
FS1, FS2 Input Current –10 +10 µA
REV. 0
ADM5180–SPECIFICATIONS
–2–
(VDD = +5 V ± 5%, Input Common-Mode Range = ±7 V. All Specifications TMIN to
TMAX unless otherwise noted.)
TIMING CHARACTERISTICS
Parameter Min Typ Max Units Test Conditions/Comments
Propagation Delay–Low to High 550 ns C
L
= 50 pF, V
IN
= ±500 mV
Propagation Delay–High to Low 550 ns C
L
= 50 pF, V
IN
= ±500 mV
Acceptable Input Frequency 0.1 MHz Unused Input Grounded, V
IN
= ±200 mV
Rejectable Input Frequency 5.5 MHz Unused Input Grounded, V
IN
= ±500 mW
(VDD = +5 V ± 5%. All Specifications TMIN to TMAX unless otherwise noted)
NOTE
1
Only one output may be shorted at any time.
Specifications subject to change without notice.
Specifications subject to change without notice.
ORDERING GUIDE
Model Temperature Range Package Option
ADM5180JN 0°C to +70°C N-28
ADM5180AN –40°C to +85°C N-28
ADM5180JP 0°C to +70°C P-28A
ADM5180AP –40°C to +85°C P-28A
REV. 0 –3–
ADM5180
ABSOLUTE MAXIMUM RATINGS
1
(T
A
= 25 °C unless otherwise noted)
V
DD
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +7 V
Common-Mode Input Voltage . . . . . . . . . . . . . . . . . . . . . . +15 V
Differential Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . +25 V
Failsafe Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . .–0.3 V to V
CC
Output Short Circuit Duration . . . . . . . . . . . . . . . . . Continuous
2
Power Dissipation Plastic DIP . . . . . . . . . . . . . . . . . . . . 1250 mW
(Derate at 12.5 mW/°C Above +50°C)
θ
JA
, Thermal Impedance . . . . . . . . . . . . . . . . . . . . . . . . 75°C/W
Power Dissipation PLCC . . . . . . . . . . . . . . . . . . . . . . . 1000 mW
(Derate at 12.5 mW/°C Above +50°C)
θ
JA
, Thermal Impedance . . . . . . . . . . . . . . . . . . . . . . . +80°C/W
CAUTION
ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily
accumulate on the human body and test equipment and can discharge without detection. Although
the ADM5180 features proprietary ESD protection circuitry, permanent damage may occur on
devices subjected to high energy electrostatic discharges. Therefore, proper ESD precautions are
recommended to avoid performance degradation or loss of functionality.
WARNING!
ESD SENSITIVE DEVICE
8mA
440µA
TO
OUTPUT
PIN
50pF
+2.1V
Figure 2. Timing Test Load
V
IN
V
OUT
0V
TH2
V
TL2
V
TH1
V
TL1
V
H1
V
H2
FS = GND
FS = V
DD
Figure 1. V
TL
, V
TH
, V
H
Definition
(V
IN
+) – (V
IN
–)
OUTPUT
t
PLH
t
PHL
50%
50%
Figure 3. Timing Waveform
W
Operating Temperature Range
Commercial ( J Version) . . . . . . . . . . . . . . . . . . . 0°C to +70°C
Industrial (A Version) . . . . . . . . . . . . . . . . . . . –40°C to +80 °C
Lead Temperature (Soldering 10 sec) . . . . . . . . . . . . . . . . +300°C
Vapour Phase (60 sec) . . . . . . . . . . . . . . . . . . . . . . . . . +215°C
Infrared (15 sec) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +220°C
NOTES
1
This is a stress rating only and functional operation of the device at these or any
other conditions above those indicated in the operation sections of this speci-
fication is not implied. Exposure to absolute maximum rating conditions for
extended periods of time may affect reliability.
2
Only one output should be shorted at any time.
PIN DESCRIPTION
Mnemonic Function
V
DD
Power Supply Input, 5 V ± 5%.
GND Ground Pin. Must be connected to 0 V.
A+ . . . H + Noninverting Input to Differential Receivers
A to H.
A– . . . H– Inverting Input to Differential Receivers A to H.
A
O
...H
O
Receiver Outputs A to H.
A through D and FS2 controls receivers
E through H.
FS1, FS2 Failsafe Control Inputs. FS1 controls receivers
A through D and FS2 control Receiver
E through H.
REV. 0–4–
ADM5180
PIN CONFIGURATIONS
DIP
A–
A+
V
DD
H
O
B+
B
O
FS1
G
O
G+
G–
A
O
B–
H+
H–
C– FS2
C+ F
O
C
O
F+
D– F–
D+ E
O
D
O
E+
GND E–
13
18
1
2
28
27
5
6
7
24
23
22
3
4
26
25
821
920
10 19
1111
12 17
16
14 15
TOP VIEW
(Not to Scale)
ADM5180
PLCC
H–
G
O
FS2
F
O
F+
G+
G–
B+
B
O
C+
C
O
D–
FS1
C–
B–
A
O
V
DD
H
O
H+
A+
D+
D
O
E+
E
O
F–
GND
E– A–
26
27
284 2
3
15 18
17
1612 14
13
25
24
21
20
19
23
22
TOP VIEW
(Not to Scale)
1
5
6
9
10
11
7
8
ADM5180
APPLICATIONS INFORMATION
FAILSAFE OPERATION
The ADM5180 provides a failsafe operating mode to guard against
input fault conditions as defined in RS-422A and RS-423A
standards. The fault conditions are (1) Driver in power-off
condition, (2) Receiver not interconnected with Driver, (3) Open-
circuited interconnecting cable, and (4) Short-circuited intercon-
necting cable. If any of these four fault conditions occurs at the
inputs of a receiver, then the output of that receiver is driven to a
known logic level. The failsafe level is programmed using the
failsafe (FS) input. There are two failsafe inputs, FS1 and FS2
which each control four receivers. FSI controls receivers A ...D
and FS2 controls receivers E . . . H. A connection to V
DD
on the
failsafe input sets the output high under fault conditions while a
connection to GND sets the output low.
FS1, FS2 Output During Fault Condition
V
DD
High
GND Low
Input Filtering
The ADM5180 contains internal low pass filtering for additional
noise rejection. Frequencies above the passband will be rejected.
For the specified input (5.5 MHz at ±500 mV) the input stage
attenuates the signal such that the threshold levels are not reached
and therefore no change of state occurs on the output. The filtering
is a function of both amplitude and and frequency. As the signal
amplitude decreases then the rejected frequency will decrease.
–5–REV. 0
ADM5180
1/8
ADM5170 +
–
1/8
ADM5180
V
L
V
H
TIE TO GND FOR
RS232
INPUT RS232/RS423A
TRANSMISSION
+V
–V
V
DD
V
FAILSAFE
V
OUT
V
L
V
H
Figure 4. EIA-232/V.28 Data Transmission
+
–
1/8
ADM5180
V
L
V
H
INPUT
RS422
TRANSMISSION
+V
–V
V
DD
V
FAILSAFE
V
OUT
V
L
V
H
+
–
+V
–V
RS422A/V.11
LINE DRIVER
Figure 5. RS-422A/V.11 Data Transmission
Typical Performance Characteristics
Figure 6. Supply Current vs. Temperature
5.5
4.5 3.50
5.1
4.7
3.40
4.9
3.35
5.3
3.45
I
DD
– mA
V
DD
– V
T
A
= +25°C
FS = 0V
VID = O/C
Figure 7. Supply Current vs. Supply Voltage
4.0
3.0 80
3.6
3.2
–20
3.4
–40
3.8
6040200
TEMPERATURE –
°
C
I
DD
– mA
V
DD
= 5V
FS = 5V
VID = O/C
PRINTED IN U.S.A. C1854–7.5–10/93
–6– REV. 0
ADM5180
OUTLINE DIMENSIONS
Dimensions shown in inches and (mm).
28-Lead Plastic Leaded Chip Carrier (PLCC)
(P Suffix)
28-Lead Plastic DIP
(N Suffix)
500
05
300
100
1
200
0
400
432
Vpp – V (VID = ±Vpp/2)
PROPAGATION DELAY – ns
TpLH
TpHL
V
DD
= 5V
FS = 0V
f = 100kHz
T
A
= +25°C
CL = 50pF
Figure 8. Propagation Delay vs. Amplitude Figure 10. Rejectable Input Frequency vs. Amplitude
5.0
3.8 5
4.4
4.0
1
4.2
0
4.8
4.6
432 I
OH
– mA
V
OH
– V
V
DD
= 5V
T
A
= +25°C
7
04
3
1
1
2
0
6
4
5
3
2
REJECTABLE INPUT FREQUENCY – MHz
Vpp – V (VID = ±Vpp/2)
VDD = 5V
FS = 0V
TA = +25°C
1000
030
600
200
10
400
0
800
20
I
OL
– mA
V
OL
– mV
AAA
A
A
A
AAA
V
DD
= 5V
FS = 0V
VID = 1V
T
A
= +25°C
PIN 1
0.580 (14.73)
0.485 (12.32)
114
15
28
0.625 (15.87)
0.600 (15.24)
0.015 (0.381)
0.008 (0.204)
0.195 (4.95)
0.125 (3.18)
0.250
(6.35)
MAX
0.022 (0.558)
0.014 (0.356) 0.100
(2.54)
BSC
0.200 (5.05)
0.125 (3.18)
0.070 (1.77)
MAX
0.060 (1.52)
0.015 (0.38)
0.150
(3.81)
MIN
SEATING
PLANE
1.565 (39.70)
1.380 (35.10)
0.048 (1.21)
0.042 (1.07)
0.456 (11.58)
0.450 (11.43)SQ
0.495 (12.57)
0.485 (12.32)SQ
0.048 (1.21)
0.042 (1.07)
0.050
(1.27)
BSC
26 4
TOP VIEW
25
19
12
11
PIN 1
IDENTIFIER
5
18
0.020
(0.50)
R
0.032 (0.81)
0.026 (0.66)
0.021 (0.53)
0.013 (0.33)
0.056 (1.42)
0.042 (1.07) 0.025 (0.63)
0.015 (0.38)
0.180 (4.57)
0.165 (4.19)
0.430 (10.92)
0.390 (9.91)
0.110 (2.79)
0.085 (2.16)
0.040 (1.01)
0.025 (0.64)
Figure 9. High Level Output Voltage vs. Output
Source Current
Figure 11. Low Level Output Voltage vs. Output
Sink Current
