SN55LBC174
QUADRUPLE LOW-POWER DIFFERENTIAL LINE DRIVER
SGLS082 – MARCH 1995
J OR W PACKAGE
(TOP VIEW)
Meets EIA Standard RS-485
Designed for High-Speed Multipoint
Transmission on Long Bus Lines in Noisy
Environments
V
1A
1Y
1
2
3
4
5
6
7
8
16
15
14
CC
4A
4Y
Supports Data Rates up to and Exceeding
Ten Million Transfers Per Second
1Z
13 4Z
1,2EN
2Z
Common-Mode Output Voltage Range of
–7 V to 12 V
12 3,4EN
11
10
9
3Z
3Y
3A
2Y
2A
Positive- and Negative-Current Limiting
GND
Low Power Consumption . . . 1.5 mA Max
(Output Disabled)
FK PACKAGE
(TOP VIEW)
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
3
2
1
20 19
3Z
4Y
4
5
6
7
8
18
17
16
15
14
1,2EN
NC
4Z
optimized
for
balanced
multipoint
bus
NC
3,4EN
3Z
transmission at data rates up to and exceeding 10
million bits per second. Each driver features wide
positive and negative common-mode output
2Z
2Y
9
10 11 12 13
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.
NC – No internal connection
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
SN55LBC173quadruple 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
INPUT
ENABLE
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.
LinBiCMOS is a trademark of Texas Instruments Incorporated.
Copyright 1995, 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
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265