DS9638CMX

Overview

The DS9638CMX is a Schottky TTL-compatible dual differential line driver designed to meet EIA RS-422 specifications. It operates on a single 5V supply with a recommended voltage range of 4.75V to 5.25V for the C-grade device. The component provides unipolar differential drive to twisted pair or parallel wire transmission lines, featuring an output short circuit protection and input clamp diodes. It supports data rates up to 10 Mb/s with propagation delays under 10 ns. The device is housed in an 8-pin SOIC package and operates within a temperature range of 0°C to +70°C.

Feature Summary

• Schottky technology ensures high-speed operation with minimal skew between complementary outputs.
• TTL and CMOS compatible inputs allow direct interfacing with standard logic families.
• Integrated output short circuit protection safeguards the drivers during fault conditions.
• Glitchless differential output design prevents false triggering on the transmission line.

Applications

• High-speed serial communication systems requiring RS-422 compliance
• Data transmission over twisted pair cables in industrial environments
• Parallel wire transmission line interfaces for digital signal processing

Procurement Notes

Verify the specific ordering suffix against the manufacturer's current documentation to confirm package type and temperature grade. Confirm RoHS compliance status as indicated in the latest packaging information addendum. Ensure the procurement channel sources from authorized distributors to guarantee authenticity. Check for lifetime buy availability if long-term supply continuity is required for production planning.

Selection Notes

Select this component when designing circuits that require robust differential signaling compliant with RS-422 standards. Consider the 8-pin SOIC package constraints for PCB layout and thermal management. Evaluate the 50 mA output drive capability against the impedance of the connected transmission lines. Verify that the operating temperature range aligns with the environmental conditions of the final application.

Part Context

This device belongs to the DS9638 family of dual differential line drivers manufactured by Texas Instruments. It utilizes Schottky transistor-transistor logic (TTL) technology to achieve fast switching speeds. The component is part of a broader portfolio of interface ICs designed for reliable data communication across various industrial and commercial applications.

Replacement Considerations

Check for equivalent RS-422 dual line drivers with similar pinouts and electrical characteristics. Verify compatibility regarding input logic levels and output drive strength. Ensure any substitute component meets the same EIA RS-422 specifications and physical package dimensions for direct replacement.

FAQ

What is the maximum propagation delay specified for the DS9638?

The maximum propagation delay is specified as less than 10 ns under typical operating conditions.

Does the DS9638 provide protection against output short circuits?

Yes, the device features built-in output short circuit protection to prevent damage during fault conditions.

Is the DS9638 compatible with CMOS logic inputs?

Yes, the inputs are designed to be compatible with both TTL and CMOS logic families.