4

12

2

1

3

6

7

5

10

9

11

14

15

13

G

G

1A

1B

2A

2B

3A

3B

4A

4B

1Y

2Y

3Y

4Y

Copyright © 2016, Texas Instruments Incorporated

11

AM26LS32AC, AM26LS32AI, AM26LS32AM

AM26LS33AC, AM26LS33AM

www.ti.com

SLLS115F – OCTOBER 1980 – REVISED SEPTEMBER 2016

Product Folder Links: AM26LS32AC AM26LS32AM AM26LS33AM

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Copyright © 1980–2016, Texas Instruments Incorporated

8 Detailed Description

8.1 Overview

The AM26LS32 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 1000 m,

giving any design a reliable and easy-to-use connection. As any RS422 interface, the AM26LS32 works in a

differential voltage range, which enables very good signal integrity.

8.2 Functional Block Diagram

Figure 16. Logic Diagram (Positive Logic)

8.3 Feature Description

The device can be configured 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 simple ways to configure the logic to match that of the receiving or

transmitting controller or microprocessor.

8.4 Device Functional Modes

The receivers implemented in these RS422 devices can be configured using the G and G logic pins to be

enabled or disabled. This allows users to ignore or filter out transmissions as desired.

(1)

H = High level, L = Low level, X = Irrelevant, Z = High impedance (off), ? = Indeterminate

Table 1. Function Table, Each Receiver

DIFFERENTIAL

A–B

ENABLES(1)

OUTPUT(1)

Y

G

G

VID ≥ VIT+

H

X

H

X

L

H

VIT– ≤ VID ≤ VIT+

H

X

?

X

L

?

VID ≤ VIT–

H

X

L

X

L

L

X

L

H

Z

Open

H

X

H

X

L

H