Texas Instruments SN75ALS181N, SN75ALS181NS, SN75ALS181NSLE, SN75ALS181NSR Datasheet
SN75ALS181
DIFFERENTIAL DRIVER AND RECEIVER PAIR
SLLS152A – DECEMBER 1992 – REVISED JUNE 1998
1
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
D
Meets TIA/EIA-422-B, TIA/EIA-485-A, and
CCITT Recommendations V.11 and X.27
D
Low Supply-Current Requirements
30 mA Max
D
Driver Output Capacity...±60 mA
D
Thermal Shutdown Protection
D
Driver Common-Mode Output Voltage
Range of –7 V to 12 V
D
Receiver Input Impedance...12 kΩ Min
D
Receiver Input Sensitivity...±200 mV
D
Receiver Input Hysteresis...60 mV Typ
D
Receiver Common-Mode Input Voltage
Range of ±12 V
D
Operates From Single 5-V Supply
D
Glitch-Free Power-Up and Power-Down
Protection
description
The SN75ALS181 is a differential driver and receiver pair designed for bidirectional data communication on
multipoint bus transmission lines. The design provides for balanced transmission lines and meets
TIA/EIA-422-B and TIA/EIA-485-A, and CCITT recommendations V.10, V.11, X.26, and X.27.
The SN75ALS181 combines a 3-state differential line driver and a differential-input line receiver that operate
from a single 5-V power supply . The driver and receiver have active-high and active-low enables, respectively ,
that can be externally connected together to function as a direction control. The driver differential outputs and
the receiver differential inputs are connected to separate pins for greater flexibility and are designed to offer
minimum loading to the bus when the driver is disabled or V
CC
= 0. These ports feature wide positive and
negative common-mode voltage changes, making the device suitable for party-line applications.
The SN75ALS181 is characterized for operation from 0°C to 70°C.
Copyright 1998, Texas Instruments Incorporated
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
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.
1
2
3
4
5
6
7
14
13
12
11
10
9
8
NC
R
RE
DE
D
GND
GND
V
CC
V
CC
A
B
Z
Y
NC
N OR NS† PACKAGE
(TOP VIEW)
NC – No internal connection
†
The NS package is only available in left-end taped
and reeled (order device SN75ALS181NSLE).
SN75ALS181
DIFFERENTIAL DRIVER AND RECEIVER PAIR
SLLS152A – DECEMBER 1992 – REVISED JUNE 1998
2
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
Function Tables
EACH DRIVER
INPUT ENABLE
OUTPUTS
D DE
Y Z
H H H L
L H L H
X L Z Z
EACH RECEIVER
DIFFERENTIAL
ENABLE OUTPUT
A – B RE Y
VID ≥ 0.2 V L H
–0.2 V < VID < 0.2 V L ?
VID ≤ – 0.2 V L L
X H Z
H = high level, L = low level, ? = indeterminate,
X = irrelevant, Z = high impedance (off)
logic symbol
†
EN1
EN2
2
1
1
9
10
12
11
4
5
3
2
DE
D
RE
R
Y
Z
A
B
†
This symbol is in accordance with ANSI/IEEE Std 91-1984 and
IEC Publication 617-12.
logic diagram (positive logic)
4
5
3
2
9
10
12
11
DE
D
RE
R
Y
Z
A
B
SN75ALS181
DIFFERENTIAL DRIVER AND RECEIVER PAIR
SLLS152A – DECEMBER 1992 – REVISED JUNE 1998
3
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
schematics of inputs
TYPICAL OF RECEIVER INPUT
V
CC
NOM
288 kΩ
GND
Input
VCC (A)
or
GND (B)
17 kΩ
NOM
NOM
1.7 kΩ
NOM
1.7 kΩ
EQUIVALENT OF EACH DRIVER INPUT
Input
V
CC
35 kΩ
NOM
schematics of outputs
TYPICAL OF DRIVER OUTPUT TYPICAL OF RECEIVER OUTPUT
Output
V
CC
70 Ω
NOM
Output
V
CC
GND
SN75ALS181
DIFFERENTIAL DRIVER AND RECEIVER PAIR
SLLS152A – DECEMBER 1992 – REVISED JUNE 1998
4
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)
†
Supply voltage, V
CC
(see Note 1) 7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Input voltage, DE, RE
, and D inputs 7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Output voltage range, driver –9 V to 14 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Input voltage range, receiver –14 V to 14 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Receiver differential input voltage range (see Note 2) –14 V to 14 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Continuous total power dissipation See Dissipation Rating Table. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Storage temperature range, T
stg
–65°C to 150°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds 260°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 affect device reliability.
NOTES: 1. All voltage values, except differential input voltage, are with respect to network ground terminal.
2. Differential input voltage is measured at the noninverting terminal with respect to the inverting terminal.
DISSIPATION RATING TABLE
PACKAGE
TA ≤ 25°C
POWER RATING
OPERATING FACTOR
ABOVE TA = 25°C
TA = 70°C
POWER RATING
N 1150 mW 9.2 mW/°C 736 mW
NS 625 mW 4.0 mW/° C 445 mW
recommended operating conditions
MIN NOM MAX UNIT
Supply voltage, V
CC
4.75 5 5.25 V
Common-mode output voltage, VOC (see Note 3) Driver –7 12 V
Common-mode input voltage, VIC (see Note 3) Receiver –12 12 V
High-level input current, V
IH
D, DE, and RE 2 V
Low-level input current, V
IL
D, DE, and RE 0.8 V
Differential input voltage, V
ID
±12 V
p
Driver –60 mA
High-level output current, I
OH
Receiver –400 µA
p
Driver 60 mA
Low-level output current, I
OL
Receiver 8 mA
Operating free-air temperature, T
A
0 70 °C
NOTE 3: The algebraic convention, where the less positive (more negative) limit is designated as minimum, is used in this table for common-mode
output voltage level only .
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