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SN75LB179A

更新时间： 2024-02-14 20:34:13
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德州仪器 - TI 驱动器
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13页 192K
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LOW-POWER DIFFERENTIAL LINE DRIVER AND RECEIVER PAIRS

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SN75LB179A 数据手册

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SN65LBC179A, SN75LBC179A  
LOW-POWER DIFFERENTIAL LINE DRIVER AND RECEIVER PAIRS  
SLLS377C – MAY 2000 – REVISED JUNE 2001  
SN65LBC179AD (Marked as BL179A)  
High-Speed Low-Power LinBiCMOS  
Circuitry Designed for Signaling Rates of  
up to 30 Mbps  
SN65LBC179AP (Marked as 65LBC179A)  
SN75LBC179AD (Marked as LB179A)  
SN75LBC179AP (Marked as 75LBC179A)  
(TOP VIEW)  
†
Bus-Pin ESD Protection Exceeds 12 kV  
HBM  
V
A
B
Z
Y
1
2
3
4
8
7
6
5
CC  
R
Very Low Disabled Supply-Current  
Requirements . . . 700 µA Max  
D
Common-Mode Voltage Range of –7 V  
to 12 V  
GND  
Low Supply Current . . . 15 mA Max  
logic diagram (positive logic)  
Compatible With ANSI Standard  
TIA/EAI-485-A and ISO8482: 1987(E)  
8
2
A
B
Positive and Negative Output Current  
Limiting  
R
D
7
Driver Thermal Shutdown Protection  
5
6
3
Y
Z
description  
The SN65LBC179A and SN75LBC179A  
differential driver and receiver pairs are monolithic  
integrated circuits designed for bidirectional data  
communication over long cables that take on the  
characteristics of transmission lines. They are  
balanced, or differential, voltage mode devices  
that are compatible with ANSI standard  
TIA/EIA-485-A and ISO 8482:1987(E). The A  
version offers improved switching performance  
over its predecessors without sacrificing  
significantly more power.  
Function Tables  
DRIVER  
INPUT  
D
OUTPUTS  
Y
Z
H
L
Open  
H
L
H
L
H
L
RECEIVER  
DIFFERENTIAL INPUTS OUTPUT  
A–B  
≥ 0.2 V  
R
H
?
L
H
The SN65LBC179A and SN75LBC179A combine  
a differential line driver and differential input line  
receiverandoperatefromasingle5-Vsupply. The  
driver differential outputs and the receiver  
differential inputs are connected to separate  
terminals for full-duplex operation and are  
designed to present minimum loading to the bus  
V
ID  
–0.2 V < V < 0.2 V  
ID  
≤ – 0.2 V  
V
ID  
Open circuit  
H = high level,  
? = indeterminate  
L = low level,  
when powered off (V  
= 0). These parts feature a wide positive and negative common-mode voltage range  
CC  
making them suitable for point-to-point or multipoint data bus applications. The devices also provide positive-  
and negative-current limiting and thermal shutdown for protection from line fault conditions.  
The SN65LBC179A is characterized over the industrial temperature range of –40°C to 85°C. The  
SN75LBC179A is characterized for operation over the commercial temperature range of 0°C to 70°C.  
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.  
†
Signaling rate by TIA/EIA-485-A definition restrict transition times to 30% of the bit length, and much higher signaling rates may be achieved  
without this requirement as displayed in the TYPICAL CHARACTERISTICS of this device.  
LinBiCMOS is a trademark of Texas Instruments.  
Copyright 2001, 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  
1234567...13

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