Texas Instruments SN751177NS, SN751178NS, SN751178NSLE, SN751178NSR Datasheet
SN751177, SN751178
DUAL DIFFERENTIAL DRIVERS AND RECEIVERS
SLLS059D – FEBRUARY 1990 – REVISED MAY 1999
1
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
D
Meet or Exceed the Requirements of ANSI
Standards TIA/EIA-422-B and TIA/EIA-485-A
and ITU Recommendations V.10 and V.11
D
Designed for Multipoint Bus Transmission
on Long Bus Lines in Noise Environments
D
Driver Positive- and Negative-Current
Limiting
D
Thermal Shutdown Protection
D
Driver 3-State Outputs
D
Receiver Common-Mode Input Voltage
Range of –12 V to 12 V
D
Receiver Input Sensitivity...±200 mV
D
Receiver Hysteresis...50 mV Typ
D
Receiver Input Impedance...12kΩ Min
D
Receiver 3-State Outputs (SN751177 Only)
D
Operate From Single 5-V Supply
description
The SN751177 and SN751178 dual differential
drivers and receivers are monolithic integrated
circuits that are designed for balanced multipoint
bus transmission at rates up to 10 Mbit/s. They are
designed to improve the performance of
full-duplex data communications over long bus
lines and meet ANSI Standards TIA/EIA-422-B
and TIA/EIA-485-A and ITU Recommendations
V.10 and V.11.
The SN751177 and SN751178 driver outputs provide limiting for both positive and negative currents and
thermal-shutdown protection from line-fault conditions on the transmission bus line.
The receiver features high input impedance of at least 12 kΩ, an input sensitivity of ±200 mV over a
common-mode input voltage range of –12 V to 12 V, and typical input hysteresis of 50 mV. Fail-safe design
ensures that if the receiver inputs are open, the receiver outputs always will be high.
The SN751177 and SN751178 are characterized for operation from –20°C to 85°C.
Copyright 1999, 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
5
6
7
8
16
15
14
13
12
11
10
9
1B
1A
1R
RE
2R
2A
2B
GND
V
CC
1D
1Y
1Z
DE
2Z
2Y
2D
SN751177 ...N OR NS† PACKAGE
(TOP VIEW)
†
The NS package is only available taped and reeled.
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
1B
1A
1R
1DE
2R
2A
2B
GND
V
CC
1D
1Y
1Z
2DE
2Z
2Y
2D
SN751178 ...N OR NS† PACKAGE
(TOP VIEW)
SN751177, SN751178
DUAL DIFFERENTIAL DRIVERS AND RECEIVERS
SLLS059D – FEBRUARY 1990 – REVISED MAY 1999
2
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
Function Tables
SN751177, SN751178
(each driver)
INPUT
ENABLE
OUTPUTS
D DE
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)
SN751177
(each receiver)
DIFFERENTIAL INPUTS
A – B
ENABLEREOUTPUT
R
VID ≥ 0.2 V L H
–0.2 V < VID < 0.2 V L ?
VID ≤ –0.2 V L L
X H Z
Open L H
H = high level, L = low level, ? = indeterminate,
X = irrelevant, Z = high impedance (off)
SN751178
(each receiver)
DIFFERENTIAL INPUTS
A – B
OUTPUT
R
VID ≥ 0.2 V H
–0.2 V < VID < 0.2 V ?
VID ≤ –0.2 V L
H = high level, L = low level,
? = indeterminate
SN751177, SN751178
DUAL DIFFERENTIAL DRIVERS AND RECEIVERS
SLLS059D – FEBRUARY 1990 – REVISED MAY 1999
3
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
logic symbols
†
SN751177
SN751178
1
1
1
1
†
These symbols are in accordance with ANSI/IEEE Std 91-1984 and
IEC Publication 617-12.
EN1
12
DE
EN2
4
15
1D
1R
3
9
2D
2R
5
2
2
1Y
14
1Z
13
1A
2
1B
1
2Y
10
2Z
11
2A
6
2B
7
EN
4
1DE
15
1D
1R
3
EN
12
2DE
9
2D
2R
5
1Y
14
1Z
13
1A
2
1B
1
2Y
10
2Z
11
2A
6
2B
7
RE
logic diagrams (positive logic)
RE
DE
SN751177
SN751178
12
4
15
14
13
2
1
3
9
10
11
6
7
5
1D
1R
2D
2R
2B
2A
2Z
2Y
1B
1A
1Z
1Y
15
14
13
1D
1Z
1Y
4
1DE
2
1
3
1R
1B
1A
9
10
11
2D
2Z
2Y
12
2DE
6
7
5
2R
2B
2A
schematics of inputs
EQUIVALENT OF RECEIVER INPUTEQUIVALENT OF DRIVER OR ENABLE INPUT
Input
V
CC
Driver Input: R
(eq)
= 6 kΩ NOM
Enable Input: R
(eq)
= 4 kΩ NOM
R
(eq)
= Equivalent Resistor
Input
V
CC
R
(eq)
All resistor values are nominal.
SN751177, SN751178
DUAL DIFFERENTIAL DRIVERS AND RECEIVERS
SLLS059D – FEBRUARY 1990 – REVISED MAY 1999
4
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
schematics of outputs
TYPICAL OF ALL RECEIVER OUTPUTSTYPICAL OF ALL DRIVER OUTPUTS
Output
85 Ω
NOM
V
CC
GND
Output
V
CC
All resistor values are nominal.
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)
†
Supply voltage, V
CC
(see Note 1) 7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Input voltage, V
I
(DE, RE, and D inputs) 7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Receiver input voltage range, V
I
(A or B inputs) –25 V to 25 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Receiver differential input voltage range, V
ID
(see Note 2) –25 V to 25 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Driver output voltage range, V
O
–10 V to 15 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Receiver low-level output current, I
OL
50 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Package thermal impedance, θ
JA
(see Note 3): N package 78°C/W. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
NS package 111°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 the network ground terminal.
2. Differential input voltage is measured at the noninverting terminal with respect to the inverting terminal.
3. The package thermal impedance is calculated in accordance with JESD 51, except for through-hole packages, which use a trace
length of zero.
Loading...