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AM26C32MJR

Quad RS-422 diff line receiver, 10Mbps, ±7V CMR, ±200mV sensitivity, fail-safe, mil-temp, 16-CDIP

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Manufacturer Part：

AM26C32MJR

Package：

16-pin CDIP (21.3 x 6.9mm, ceramic)

Description

Product Overview

The AM26C32MJR is a quadruple differential line receiver from Texas Instruments compliant with TIA/EIA-422-B, TIA/EIA-423-B, and ITU V.10/V.11 standards. It features ±7V common-mode range with ±200mV input sensitivity, 60mV input hysteresis, and fail-safe open-input detection (output goes high). BiCMOS technology reduces power to one-fifth of the AM26LS32. The MJR suffix denotes military-grade -55°C to +125°C operation in 16-pin CDIP.

Key Specifications

Receivers	4 (differential)
Standards	TIA/EIA-422-B, TIA/EIA-423-B, ITU V.10/V.11
Supply Voltage	5V (single supply)
Signaling Rate	Up to 10 Mbps
Propagation Delay	17 ns typical
Common-Mode Range	-7V to +7V
Input Sensitivity	±200 mV over full common-mode range
Input Hysteresis	60 mV typical
Supply Current	10 mA typical
Output Type	3-state, 6mA source/sink
Fail-Safe	Open input → output high
Fault Protection	-11V to +14V on A/B inputs
ESD Protection	±3000V HBM, ±2000V CDM
Package	16-pin CDIP (ceramic)
Operating Temperature	-55°C to +125°C (military)

Features

Compliant with EIA-422-B, EIA-423-B, and ITU V.10/V.11
±7V common-mode range with ±200mV sensitivity
60mV input hysteresis for noise immunity
Input fail-safe: open inputs force output high
3-state outputs with active-high and active-low enable
BiCMOS technology: 1/5 power of AM26LS32
±3000V HBM ESD protection
Direct replacement for AM26LS32
MIL-PRF-38535 qualified (M suffix)

Applications

Military and aerospace communication receivers
Industrial RS-422/RS-423 bus receivers
Motor encoder signal receivers
Factory automation data links
Smart grid and power automation
Servo and AC motor drive receivers

Product Introduction:AM26C32MJR Product Introduction

The AM26C32MJR is a military-grade quadruple differential line receiver from Texas Instruments, designed to receive balanced or unbalanced digital data per TIA/EIA-422-B, TIA/EIA-423-B, and ITU V.10/V.11 standards. It features ±7V common-mode input range with ±200mV sensitivity across the full range, 60mV input hysteresis for noise rejection, and a fail-safe circuit that forces the output high when inputs are open (detecting broken wires). BiCMOS fabrication reduces power consumption to approximately one-fifth of the bipolar AM26LS32 while maintaining AC and DC performance. The MJR suffix specifies the ceramic CDIP package with -55°C to +125°C operation and MIL-PRF-38535 qualification for military applications.

Working Principle:AM26C32MJR Working Principle

Each of the four AM26C32 receivers compares the voltage difference between its A and B inputs. When VA – VB exceeds +200mV, the output Y goes high; when VA – VB falls below -200mV, Y goes low. The 60mV hysteresis band prevents output oscillation when the differential input is near the switching threshold. The ±7V common-mode range means the inputs can be at any voltage from -7V to +7V relative to ground, as long as the differential voltage exceeds the ±200mV threshold — critical in industrial environments where ground potential differences between transmitter and receiver can be significant. The fail-safe circuit biases the inputs so that if both A and B are floating (broken cable), the output defaults to a defined high state. The 3-state outputs are controlled by dual enable pins (G and Ḡ), allowing multiple receivers to share a common data bus in bus-organized systems.

Pin Description:AM26C32MJR Pin Definition and Functions

Pin	Name	Description
1	1B	Receiver 1 inverting input
2	1A	Receiver 1 non-inverting input
3	1Y	Receiver 1 output
4	G	Active-high enable (common to all 4 receivers)
5	2Y	Receiver 2 output
6	2A	Receiver 2 non-inverting input
7	2B	Receiver 2 inverting input
8	GND	Ground
9	3B	Receiver 3 inverting input
10	3A	Receiver 3 non-inverting input
11	3Y	Receiver 3 output
12	Ḡ	Active-low enable (common to all 4 receivers)
13	4Y	Receiver 4 output
14	4A	Receiver 4 non-inverting input
15	4B	Receiver 4 inverting input
16	VCC	+5V supply

Application Scenarios:In which products and applications isAM26C32MJR used

Military RS-422 Communication Link: Pair with the AM26C31MJR driver to form a complete military-grade RS-422 data link. The ±7V common-mode range handles ground potential differences between vehicles or shelters. The fail-safe circuit detects cable disconnection, triggering an alarm in the system controller. The ceramic package and -55°C to +125°C rating ensure reliability in extreme environments.
Industrial Encoder Receiver: Receive quadrature encoder signals from a remote motor. The 60mV hysteresis rejects induced noise on long cable runs near motor drives. The ±200mV sensitivity allows the encoder signals to attenuate over distance without loss of reception. The 10Mbps data rate supports high-resolution encoders at 3000+ RPM.
Smart Grid Data Concentrator: Use the four receivers to accept data from up to four RS-422 metering nodes. The 3-state outputs allow all four receiver outputs to connect to a shared MCU data bus, with the enable pins selecting which receiver’s data is read. The fail-safe feature ensures that a disconnected meter is detected immediately.

Alternative Models:What chips are recommended as replacements for AM26C32MJR

Model	Temp Range	Package	Key Difference
AM26C32IDR	-40~85°C	SOIC-16	Industrial grade, surface mount
AM26LS32MJ	-55~125°C	CDIP-16	Bipolar predecessor, 5x higher power
DS26C32ATM	-40~85°C	SOIC-16	TI/NatSemi alternative
SN65HVD33	-40~125°C	SOIC-16	TI, RS-485 full-duplex transceiver