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SN75178 PDF预览

SN75178

更新时间: 2024-11-28 22:53:35
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德州仪器 - TI 中继器
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11页 167K
描述
DIFFERENTIAL BUS REPEATERS

SN75178 数据手册

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SN75177B, SN75178B  
DIFFERENTIAL BUS REPEATERS  
SLLS002C – D2606, JULY 1985 – REVISED FEBRUARY 1993  
SN75177B . . . D OR P PACKAGE  
(TOP VIEW)  
Meets EIA Standards RS-422-A and RS-485  
and CCITT Recommendations V.11 and X.27  
Designed for Multipoint Transmission on  
V
A
B
Z
Y
1
2
3
4
8
7
6
5
CC  
T
Long Bus Lines in Noisy Environments  
3-State Outputs  
EN  
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 kMin  
Receiver Input Sensitivity . . . ±200 mV  
Receiver Input Hysteresis . . . 50 mV Typ  
Operates From Single 5-V Supply  
Low Power Requirements  
GND  
SN75178B . . . P PACKAGE  
(TOP VIEW)  
V
A
B
Z
Y
1
2
3
4
8
7
6
5
CC  
T
EN  
GND  
THE SN75177B IS NOT  
RECOMMENDED FOR NEW DESIGN  
description  
The SN75177B and SN75178B differential bus repeaters are monolithic integrated devices each designed for  
one-way data communication on multipoint bus transmission lines. These devices are designed for balanced  
transmission bus line applications and meet EIA Standard RS-422-A and RS-485 and CCITT  
Recommendations V.11 and X.27. Each device is designed to improve the performance of the data  
communication over long bus lines. The SN75177B and SN75178B are identical except for the complementary  
enable inputs, which allow the devices to be used in pairs for bidirectional communication.  
The SN75177B and SN75178B feature positive- and negative-current limiting 3-state outputs for the receiver  
and driver. 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 features thermal  
shutdown for protection from line fault conditions. Thermal shutdown is designed to occur at a junction  
temperature of approximately 150°C. The driver is designed to drive current loads up to 60 mA maximum.  
The SN75177B and SN75178B are designed for optimum performance when used on transmission buses  
employing the SN75172 and SN75174 differential line drivers, SN75173 and SN75175 differential line  
receivers, or SN75176B bus transceiver.  
Function Tables  
SN75177B  
DIFFERENTIAL INPUTS  
A – B  
ENABLE  
OUTPUTS  
EN  
H
T
H
?
Y
H
?
Z
L
V
0.2 V  
ID  
0.2 V < V < 0.2 V  
H
?
ID  
V
ID  
0.2 V  
H
L
L
H
Z
X
L
Z
Z
SN75178B  
DIFFERENTIAL INPUTS  
A – B  
ENABLE  
OUTPUTS  
EN  
L
T
H
?
Y
H
?
Z
L
V
0.2 V  
ID  
0.2 V < V < 0.2 V  
L
?
ID  
V
ID  
0.2 V  
L
L
L
H
Z
X
H
Z
Z
H = high level, L = low level, ? = indeterminate, X = irrelevant, Z = impedance (off)  
Copyright 1993, 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.  
2–1  
POST OFFICE BOX 655303 DALLAS, TEXAS 75265  

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