SGLS082A − MARCH 1995 − REVISED JULY 2004
1
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
D Meets EIA Standard RS-485
D Designed for High-Speed Multipoint
Transmission on Long Bus Lines in Noisy
Environments
D Supports Data Rates up to and Exceeding
Ten Million Transfers Per Second
D Common-Mode Output Voltage Range of
−7 V to 12 V
D Positive- and Negative-Current Limiting
D Low Power Consumption...1.5 mA Max
(Output Disabled)
description
The SN55LBC174 is composed of monolithic
quadruple differential line drivers with 3-state
outputs. This device is designed to meet the
requirements of the Electronics Industry
Association (EIA) Standard RS-485 and is
optimized for balanced multipoint bus
transmission at data rates up to and exceeding 10
million bits per second. Each driver features wide
positive and negative common-mode output
voltage ranges, current limiting, and
thermal-shutdown protection making it suitable
for party-line applications in noisy environments.
This device is designed using LinBiCMOS,
facilitating ultra-low power consumption and
inherent robustness.
The SN55LBC174 provides positive and negative-current limiting and thermal shutdown for protection from line
fault conditions on the transmission bus line. This device offers optimum performance when used with the
SN55LBC173 quadruple line receiver. The SN55LBC174 is available in the 16-pin CDIP package (J), the 16-pin
CPAK (W), or the 20-pin LCCC package (FK).
The SN55LBC174 is characterized for operation over the military temperature range of −55°C to 125°C.
FUNCTION TABLE
(each driver)
OUTPUTS
Y Z
H H H L
L H L H
X L Z Z
H = high level, L = low level, X = irrelevant,
Z = high impedance (off)
Copyright 2004, Texas Instruments Incorporated
! "#$ ! %#&'" ($)
(#"! " !%$""! %$ *$ $! $+! !#$!
!(( ,-) (#" %"$!!. ($! $"$!!'- "'#($
$!. '' %$$!)
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
1A
1Y
1Z
1,2EN
2Z
2Y
2A
GND
V
CC
4A
4Y
4Z
3,4EN
3Z
3Y
3A
(TOP VIEW)
NC − No internal connection
FK PACKAGE
(TOP VIEW)
1920132
17
18
16
15
14
1312119 10
5
4
6
7
8
4Y
4Z
NC
3,4EN
3Z
1Z
1,2EN
NC
2Z
2Y
1Y
1A
NC
4A
GND
NC
3A
3Y
2A
V
CC
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
%(#"! "%' /0102 '' %$$! $ $!$(
#'$!! *$,!$ $() '' *$ %(#"!2 %(#"
%"$!!. ($! $"$!!'- "'#($ $!. '' %$$!)
LinBiCMOS is a trademark of Texas Instruments Incorporated.
