SN75ALS174A
QUADRUPLE DIFFERENTIAL LINE DRIVER
SLLS122E – JULY 1991 – REVISED APRIL 1998
N PACKAGE
(TOP VIEW)
Meets or Exceeds the Requirements of
ANSI EIA/TIA-422-B and RS-485
High-Speed Advanced Low-Power Schottky
Circuitry
V
1A
1Y
1
2
3
4
5
6
7
8
16
15
14
13
12
CC
4A
Designed for up to 20-Mbit/s Operation in
Both Serial and Parallel Applications
4Y
1Z
4Z
1,2EN
2Z
Designed for Multipoint Transmission on
Long Bus Lines in Noisy Environments
3,4EN
11 3Z
10 3Y
2Y
2A
Low Supply Current Requirements
55 mA Max
9
3A
GND
Wide Positive and Negative Input/Output
Bus Voltage Ranges
DW PACKAGE
(TOP VIEW)
Driver Output Capacity . . . ±60 mA
Thermal-Shutdown Protection
1A
1Y
V
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
CC
Driver Positive- and Negative-Current
Limiting
4A
4Y
NC
4Z
NC
Functionally Interchangeable With SN75174
1Z
1,2EN
2Z
description
15 3,4EN
14
13
12
11
NC
3Z
NC
3Y
3A
The SN75ALS174A is a quadruple line driver with
3-state differential outputs. It is designed to meet
2Y
2A
the
EIA/TIA-422-B and RS-485. This device is
optimized for balanced multipoint bus
requirements
of
ANSI
Standards
GND
NC – No internal connection
transmission at rates of up to 20 Mbit/s. Each
driver features wide positive and negative
common-mode output voltage ranges that make
them suitable for party-line applications in noisy
environments.
The SN75ALS174A provides positive- and negative-current limiting and thermal shutdown for protection from
line fault conditions on the transmission bus line. Shutdown occurs at a junction temperature of
approximately 150°C.
The SN75ALS174A is characterized for operation from 0°C to 70°C.
FUNCTION TABLE
(each driver)
OUTPUTS
INPUT
A
ENABLES
Y
H
L
Z
L
H
L
H
H
L
H
Z
X
Z
H = high level, L = low level, X=irrelevant,
Z = high impedance (off)
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.
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.
1
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