DS9638CM

Overview

The DS9638CM is a dual high-speed differential line driver designed to meet EIA RS-422 specifications. It operates on a single 5V supply with Schottky technology for TTL and CMOS compatibility. The device features short circuit protection, input clamp diodes, and complementary outputs. It provides an output drive capability of 50 mA for 50Ω transmission lines. Propagation delay is less than 10 ns, with typical skew under 1.0 ns. Operating temperature ranges from 0°C to +70°C.

Feature Summary

• Schottky technology ensures TTL and CMOS compatible inputs
• Short circuit protected active pull-up with low output impedance
• Glitchless differential output with stable delay time

Applications

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

Procurement Notes

Verify the specific package variant (SOIC) and suffix against current TI documentation. Confirm availability status as the component may be in lifecycle transition. Ensure environmental compliance matches project requirements before finalizing procurement orders.

Selection Notes

Select this component for applications requiring RS-422 compliance with TTL inputs. Verify that the 5V supply voltage aligns with system power rails. Consider thermal derating factors for the SOIC package when designing PCB layouts for sustained operation.

Part Context

This part belongs to Texas Instruments' legacy RS-422 interface family. It utilizes Schottky logic to achieve high-speed performance while maintaining compatibility with standard digital logic families. The design focuses on robust signal integrity for industrial communication environments.

Replacement Considerations

Check for direct pin-compatible alternatives within the SN65LVDS or AM26C series if newer designs are required. Verify electrical parameter equivalence, particularly propagation delay and drive strength, before substituting.