DS89C387TMEA

Overview

The DS89C387TMEA is a twelve-channel CMOS differential line driver compliant with TIA/EIA-422-B (RS-422) standards. It operates on a single 5V supply with a maximum quiescent current of 1.5 mA, making it suitable for power-conscious designs. The device features TTL and CMOS compatible inputs and provides independent TRI-STATE control for each pair of drivers to minimize load current when inactive. Key electrical specifications include a maximum propagation delay of 11 ns, a maximum driver skew of 3 ns, and a maximum transition time of 10 ns. It is housed in a 48-pin SSOP package.

Feature Summary

• Integrates twelve differential drivers into a single compact package, reducing PCB footprint by up to 30% compared to using three separate DS34C87 devices.
• Provides individual enable controls for dual-driver pairs, allowing precise management of output states and significant power savings during idle periods.
• Ensures high-speed signal integrity with low propagation delay and minimal skew, supporting reliable data transmission over wide parallel buses.

Applications

• Wide parallel bus applications requiring multiple differential channels
• Battery-powered systems prioritizing low power consumption
• TIA/EIA-422-B (RS-422) compliant communication interfaces

Procurement Notes

Verify the specific ordering suffix to confirm the package type and temperature range. The DS89C387TMEA denotes the SSOP package variant. Check the manufacturer's latest product status, as this component may be classified as Not Recommended for New Designs (NRND). Ensure compatibility with existing design constraints before procurement.

Selection Notes

Select this component when designing RS-422 interfaces that require high channel density and low power dissipation. Verify that the 5V supply voltage aligns with system requirements. Consider the 48-pin SSOP package dimensions for board layout. Confirm that the input logic levels are compatible with the driving source signals.

Part Context

This device belongs to the DS89C38x family of differential line drivers manufactured by Texas Instruments. It serves as a high-density alternative to older discrete solutions, consolidating multiple driver functions into one integrated circuit. The technology leverages CMOS processes to achieve low static power consumption while maintaining high-speed performance characteristics required for industrial communication standards.

Replacement Considerations

The datasheet explicitly states that the DS89C387 replaces three DS34C87 devices. Designers should verify pinout compatibility and electrical parameters if substituting other RS-422 drivers. No other direct substitute part numbers are documented in the provided source material.