SN75179A Datasheet, PDF (1/10 Pages) Texas Instruments – DIFFERENTIAL DRIVER AND RECEIVER PAIR

ą
• Meets EIA Standards RS-422A, RS423A,
and CCITT Recommendations V.11 and X.27
• Bus Voltage Range . . . −7 V to 12 V
• Positive and Negative Current Limiting
• Driver Output Capability . . . 60 mA Max
• Driver Thermal Shutdown Protection
• Receiver Input Impedance . . . 12 kΩ Min
• Receiver Input Sensitivity . . . ± 200 mV
• Receiver Input Hysteresis . . . 50 mV Typ
• Operates From Single 5-V Supply
• Low Power Requirements
SN75179A
DIFFERENTIAL DRIVER AND RECEIVER PAIR
ą
SLLS123B − D2845, JUNE 1984 − REVISED FEBRUARY 1993
D OR P PACKAGE
(TOP VIEW)
V_CC 1
R2
D3
GND 4
8A
7B
6Z
5Y
NOT RECOMMENDED FOR NEW DESIGN
logic symbol
description
The SN75179A driver and bus receiver circuit is a
monolithic integrated device designed for
balanced transmission line applications, and
meets EIA Standards RS-422A, RS-423A, and
CCITT Recommendations V.11 and X.27. It is
designed to improve the performance of data
communications over long bus lines.
The SN75179A features positive- and negative-
current limiting for the driver and receiver. The
receiver features high input impedance, input
hysteresis for increased noise immunity, and input
sensitivity of ± 200 mV over a common-mode input
voltage range of −12 V to 12 V.
The driver provides thermal shutdown for
protection from line fault conditions. Thermal
shutdown is designed to occur at a junction
temperature of approximately 150°C. The device
is designed to drive current loads of up to 60 mA
maximum.
The SN75179A is characterized for operation
from 0°C to 70°C.
2
R
3
D
logic diagram
2
R
3
D
8
A
7
B
6
Z
5
Y
8
A
7
B
6
Z
5
Y
Function Tables
DRIVER
INPUT
D
OUTPUTS
YZ
H
HL
L
LH
RECEIVER
DIFFERENTIAL INPUTS
A−B
VID ≥ 0.2 V
−0.2 V < VID < 0.2 V
VID ≤ −0.2 V
H = high level, L = low level, ? = indeterminate
OUTPUT
R
H
?
L
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.
• POST OFFICE BOX 655303 DALLAS, TEXAS 75265
• POST OFFICE BOX 1443 HOUSTON, TEXAS 77001
Copyright  1993, Texas Instruments Incorporated
2−1