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DS8921AM/NOPB

TIDS8921AM/NOPB

Texas Instruments
1/1 Transceiver Full RS422, RS485 8-SOIC
NRND1,957 in stock

Overview

The DS8921AM/NOPB is a differential line driver and receiver pair designed specifically for full-duplex RS-422 and RS-485 serial data communication. It operates from a 5V supply and provides a robust interface between TTL/CMOS logic levels and differential transmission lines. This transceiver is optimized for high-speed data transmission over long distances in electrically noisy environments.

Why Choose This Part

It features a typical receiver input hysteresis of 70mV to improve noise immunity and prevent false triggering in industrial settings. The SOIC-8 package offers a compact footprint for space-constrained PCB designs while maintaining compatibility with standard 5V logic systems.

Applications

Industrial Control Systems
Connecting PLCs and distributed I/O modules over long cable runs using the RS-422 protocol.
Motor Encoder Feedback
Transmitting high-speed differential position data from rotary encoders to motion controllers.
Point-to-Point Data Links
Establishing reliable full-duplex communication between two dedicated embedded systems.

Key Specifications

Type Transceiver
Duplex Full
Protocol RS422, RS485
Mounting Type Surface Mount
Package / Case 8-SOIC (0.154", 3.90mm Width)
Voltage - Supply 4.5V ~ 5.5V
Receiver Hysteresis 70 mV
Operating Temperature 0degC ~ 70degC
Supplier Device Package 8-SOIC
Number of Drivers/Receivers 1/1

Getting Started

To evaluate this part, place it on a SOIC-8 breakout board for breadboard prototyping or integrate it directly into a PCB with 100-ohm to 120-ohm termination resistors. Ensure a 0.1uF bypass capacitor is located near the VCC pin and that differential traces are routed with matched lengths for optimal signal integrity.

Also Consider

MAX485 Maxim Integrated / Analog Devices - A widely used alternative for RS-485/RS-422 communication with lower power consumption requirements.
SN75176B TITexas Instruments - An industry-standard transceiver for multipoint RS-485 applications requiring higher output drive.