DS9638CN

Overview

The DS9638CN is a dual high-speed differential line driver designed to meet EIA RS-422 specifications. It operates on a single 5V supply and features Schottky technology for TTL and CMOS compatible inputs. The device provides unipolar differential drive to twisted pair or parallel wire transmission lines, with an output drive capability of 50 mA for 50Ω lines. Key electrical parameters include a propagation delay of less than 10 ns (typical), minimum output skew of less than 1.0 ns (typical), and stable delay time across voltage and temperature variations. It includes short circuit protection and input clamp diodes.

Feature Summary

• Schottky technology ensures fast switching speeds and compatibility with standard logic families.
• Integrated short circuit protection safeguards the outputs during fault conditions.
• Input clamp diodes provide protection against transient voltage spikes on input lines.

Applications

• High-speed serial data communication systems requiring RS-422 compliance.
• Industrial control networks utilizing twisted pair transmission lines.
• Parallel wire interconnects in digital signal processing equipment.

Procurement Notes

Verify the specific suffix 'CN' indicates the ceramic DIP package variant when sourcing. Confirm that the component meets the required military or commercial temperature grades, as the datasheet distinguishes between DS9638M and DS9638C operating ranges. Ensure proper ESD handling procedures are followed due to limited built-in protection.

Selection Notes

Select this component for applications requiring robust differential signaling over moderate distances. Consider the package density and thermal dissipation characteristics if multiple drivers are used. Verify that the system power supply remains within the recommended 4.75V to 5.5V range to maintain specified timing parameters.

Part Context

The DS9638 series belongs to Texas Instruments' legacy line of RS-422 interface components. It serves as a high-speed alternative to standard TTL drivers for differential applications. The device is part of a family that includes variants with different packaging options and temperature ratings, maintaining functional consistency across the series.

Replacement Considerations

Direct pin-compatible replacements may include other RS-422 dual drivers from the same manufacturer. Verify that any substitute maintains the 50 mA output drive capability and Schottky input characteristics to ensure signal integrity in existing designs.