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AM26C32CD Datasheet(PDF) 8 Page - Texas Instruments |
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AM26C32CD Datasheet(HTML) 8 Page - Texas Instruments |
8 / 30 page Input VCC EQUIVALENT OF A OR B INPUT TYPICAL OF ALL OUTPUTS Output VCC VCC 1.7 k Ω NOM GND GND 1.7 k Ω NOM 17 k Ω NOM 288 k Ω 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 Submit Documentation Feedback Copyright © 1990–2015, Texas Instruments Incorporated Product Folder Links: AM26C32 |
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