DS9638CMX/NOPB

Overview

The DS9638CMX/NOPB is a Schottky, TTL-compatible dual differential line driver designed to meet EIA RS-422 specifications. It operates on a single 5V supply and provides unipolar differential drive to twisted pair or parallel wire transmission lines. The device features TTL and CMOS compatible inputs with complementary outputs similar to totem pole TTL outputs. Key electrical parameters include a propagation delay of less than 10 ns, output short circuit protection, and an output drive capability of 50 mA for 50Ω transmission lines. It is housed in an 8-pin SOIC package.

Feature Summary

• Schottky technology ensures high-speed operation with minimal skew between outputs.
• Integrated input clamp diodes provide protection against transient voltage spikes.
• Output stage includes active pull-up and pull-down mechanisms for low output impedance.
• Delay time remains stable across variations in supply voltage and temperature.

Applications

• RS-422 compliant data communication systems
• High-speed differential signaling over twisted pair cables
• Parallel wire transmission line drivers

Procurement Notes

Verify the LIFEBUY status before finalizing design integration, as Texas Instruments has announced discontinuation. Confirm that the current stock availability meets long-term production requirements. Ensure compliance with RoHS standards and check for any specific environmental certifications required by your manufacturing process. Review the datasheet for any updates regarding handling precautions due to limited ESD protection.

Selection Notes

Select this component when designing circuits requiring RS-422 standard compliance with TTL logic levels. Verify that the operating temperature range of 0°C to +70°C aligns with your system's environmental conditions. Consider the 8-pin SOIC package dimensions for PCB layout constraints. Ensure power supply stability within the recommended 4.75V to 5.25V range to maintain signal integrity and timing specifications.

Part Context

This part belongs to the DS9638 family of dual high-speed differential line drivers manufactured by Texas Instruments. It is specifically engineered for robust performance in noisy environments typical of industrial and commercial data transmission applications. The device leverages Schottky technology to achieve fast switching speeds while maintaining compatibility with standard TTL logic families.

Replacement Considerations

No direct public substitute part numbers are confirmed in the provided documentation. Designers should evaluate other RS-422 transceivers from Texas Instruments or third-party manufacturers, ensuring pinout compatibility and electrical parameter alignment. Consult official TI resources for potential future replacements if available.