Texas Instruments SN75179BP, SN75179BPS, SN75179BPSR, SN75179BD, SN75179BDR Datasheet
SN75179B
DIFFERENTIAL DRIVER AND RECEIVER PAIR
SLLS003E – OCTOBER 1985 – REVISED JUNE 1998
1
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
D
Meets or Exceeds the Requirements of
TIA/EIA-422-B, TIA/EIA-485-A, and ITU
Recommendation V.11
D
Bus Voltage Range...–7 V to 12 V
D
Positive- and Negative-Current Limiting
D
Driver Output Capability...60 mA Max
D
Driver Thermal-Shutdown Protection
D
Receiver Input Impedance...12 kΩ Min
D
Receiver Input Sensitivity...±200 mV
D
Receiver Input Hysteresis...50 mV Typ
D
Operates From Single 5-V Supply
D
Low Power Requirements
description
The SN75179B is a differential driver and receiver pair designed for balanced transmission-line applications
and meets TIA/EIA-422-B, TIA/EIA-485-A, and ITU Recommendation V.11. It is designed to improve the
performance of full-duplex data communications over long bus lines.
The SN75179B driver output provides limiting for both positive and negative currents. 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 –7 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 SN75179B is designed to drive current loads of up to 60 mA maximum.
The SN75179B is characterized for operation from 0°C to 70°C.
Function Tables
DRIVER
INPUT
OUTPUTS
D
Y Z
H H L
L L H
RECEIVER
DIFFERENTIAL INPUTS
OUTPUT
A – B R
VID ≥ 0.2 V H
–0.2 V < VID < 0.2 V ?
VID ≤ –0.2 V L
Open ?
H = high level, L = low level, ? = indeterminate
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
8
7
6
5
V
CC
R
D
GND
A
B
Z
Y
D OR P PACKAGE
(TOP VIEW)
SN75179B
DIFFERENTIAL DRIVER AND RECEIVER PAIR
SLLS003E – OCTOBER 1985 – REVISED JUNE 1998
2
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
logic symbol
†
D
R
3
2
Y
Z
B
A
5
6
7
8
†
This symbol is in accordance with ANSI/IEEE Std 91-1984
and IEC Publication 617-12.
logic diagram (positive logic)
D
R
3
2
Y
Z
B
A
5
6
7
8
schematics of inputs and outputs
TYPICAL OF ALL RECEIVER OUTPUTS
TYPICAL OF ALL DRIVER OUTPUTS
EQUIVALENT OF EACH RECEIVER INPUT
EQUIVALENT OF DRIVER INPUT
Output
V
CC
85 Ω
NOM
Input
V
CC
16.8 kΩ
NOM
960 Ω
NOM
GND
Output
V
CC
Driver input: R
(eq)
= 3 kΩ NOM
R
(eq)
= equivalent resistor
Input
V
CC
960 Ω
NOM
SN75179B
DIFFERENTIAL DRIVER AND RECEIVER PAIR
SLLS003E – OCTOBER 1985 – REVISED JUNE 1998
3
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. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Voltage range at any bus terminal –10 V to 15 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Differential input voltage, V
ID
(see Note 2) ±25 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Package thermal impedance, θ
JA
(see Note 3):D package 197°C/W. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
P package 104°C/W. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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 input with respect to the corresponding inverting input.
3. The package thermal impedance is calculated in accordance with JESD 51, except for through-hole packages, which use a trace
length of zero.
recommended operating conditions
MIN NOM MAX UNIT
Supply voltage, V
CC
4.75 5 5.25 V
High-level input voltage, V
IH
Driver 2 V
Low-level input voltage, V
IL
Driver 0.8 V
Common-mode input voltage, V
IC
–7
‡
12 V
Differential input voltage, V
ID
±12 V
p
Driver –60 mA
High-level output current, I
OH
Receiver –400 µA
p
Driver 60
Low-level output current, I
OL
Receiver 8
mA
Operating free-air temperature, T
A
0 70 °C
‡
The algebraic convention, where the less positive (more negative) limit is designated minimum, is used in this data sheet for common-mode input
voltage and threshold voltage.
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