DS89C21TMX

Overview

The DS89C21TMX is a differential CMOS line driver and receiver pair designed to meet TIA/EIA-422-A (RS-422) and CCITT V.11 interface standards. It integrates one driver and one receiver in an 8-pin SOIC package. The device operates with a supply voltage range of 4.50V to 5.50V and supports temperatures from -40°C to +85°C. Typical supply current is 6mA, with power consumption around 15mW. Driver propagation delay is 10ns maximum, while receiver delay reaches 30ns. Transition times are specified at 2.2ns for the driver.

Feature Summary

• Compliant with RS-422 electrical characteristics and V.11 recommendations
• Low power CMOS design suitable for battery-powered applications
• High-speed operation capability exceeding 10 MHz
• Receiver incorporates hysteresis and open input failsafe feature

Applications

• Battery-powered communication systems
• High-speed data transmission links above 10 MHz
• Industrial control networks requiring RS-422 compliance

Procurement Notes

Verify the specific ordering suffix against the manufacturer's official documentation to confirm availability status and packaging details. The datasheet indicates that certain suffixes may correspond to lifetime buy status rather than functional differences. Confirm RoHS compliance and lead finish specifications directly from the latest package addendum before finalizing procurement orders.

Selection Notes

Select this component when a single-channel differential transceiver is required within a minimal footprint. Ensure the application environment stays within the recommended operating temperature range of -40°C to +85°C. Verify that the system logic levels are compatible with the TTL and CMOS inputs and outputs supported by the device architecture.

Part Context

This part belongs to the DS89C21 series of differential CMOS line drivers and receivers. It serves as a compact solution for implementing RS-422 communication interfaces. The device is manufactured by Texas Instruments and utilizes standard SOIC packaging to facilitate surface mount assembly in space-constrained electronic designs.

Replacement Considerations

DS89C21TM/NOPB

FAQ

What is the maximum differential output voltage skew?

The maximum driver skew is specified as 2.0 ns.

How does the receiver handle open inputs?

The receiver includes an open input failsafe feature that ensures a high output state when inputs are non-terminated.

What is the minimum detectable signal voltage for the receiver?

The receiver can detect signals as low as 200 mV differential voltage.