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AM26C32 bảng dữ liệu(PDF) 8 Page - Texas Instruments

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tên linh kiện AM26C32
Giải thích chi tiết về linh kiện  AM26C32 Quadruple Differential Line Receiver
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nhà sản xuất  TI1 [Texas Instruments]
Trang chủ  http://www.ti.com
Logo TI1 - Texas Instruments

AM26C32 bảng dữ liệu(HTML) 8 Page - Texas Instruments

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Input
VCC
EQUIVALENT OF A OR B INPUT
TYPICAL OF ALL OUTPUTS
Output
VCC
VCC
1.7 k
NOM
GND
GND
1.7 k
NOM
17 k
NOM
288 k
NOM
VCC (A inputs)
or
GND (B inputs)
Input
GND
EQUIVALENT OF G OR G INPUT
AM26C32
SLLS104K – DECEMBER 1990 – REVISED JUNE 2015
www.ti.com
8 Detailed Description
8.1 Overview
The AM26C32 is a quadruple differential line receiver that meets the necessary requirements for NSI TIA/EIA-
422-B, TIA/EIA-423-B, and ITU Recommendation V.10 and V.11. This device allows a low power or low voltage
MCU to interface with heavy machinery, subsystems and other devices through long wires of up to 1000m, giving
any design a reliable and easy to use connection. As any RS422 interface, the AM26C32 works in a differential
voltage range, which enables very good signal integrity.
8.2 Functional Block Diagram
8.3 Feature Description
8.3.1 ±7-V Common-Mode Range With ±200-mV Sensitivity
For a common-mode voltage varying from -7V to 7V, the input voltage is acceptable in low ranges greater than
200 mV as a standard.
8.3.2 Input Fail-Safe Circuitry
RS-485 specifies that the receiver output state should be logic high for differential input voltages of VAB ≥ +200
mV and logic low for VAB ≤ –200 mV. For input voltages in between these limits, a receiver’s output state is not
defined and can randomly assume high or low. Removing the uncertainty of random output states, modern
transceiver designs include internal biasing circuits that put the receiver output into a defined state (typically high)
in the absence of a valid input signal.
A loss of input signal can be caused by an pen circuit caused by a wire break or the unintentional disconnection
of a transceiver from the bus. The AM26C32 has an internal circuit that ensures functionality during an idle bus.
8.3.3 Active-High and Active-Low
The device can be configure using the G and G logic inputs to select receiver output. The high voltage or logic 1
on the G pin, allows the device to operate on an active-high and having a low voltage or logic 0 on the G enables
active low operation. These are simply a way to configure the logic to match that of the receiving or transmitting
controller or microprocessor.
8.3.4 Operates from a Single 5-V Supply
Both the logic and receivers operate from a single 5-V rail, making designs much more simple. The line drivers
and receivers can operate off the same rail as the host controller or a similar low voltage supply, thus simplifying
power structure.
8
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Copyright © 1990–2015, Texas Instruments Incorporated
Product Folder Links: AM26C32


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