DS9637ACMX

Overview

The DS9637ACMX is a dual differential line receiver manufactured by Texas Instruments, designed to meet EIA RS-422 and RS-423 standards. It operates on a single 5V supply with Schottky TTL compatible outputs. The device supports data rates up to 10 Mb/s and features an operational input common mode range of ±7V. Recommended operating conditions specify a supply voltage between 4.75V and 5.25V for the AC variant, with an operating temperature range from 0°C to +70°C. Electrical characteristics include a typical propagation delay of 25 ns and a supply current of 50 mA.

Feature Summary

• Dual channel architecture supporting RS-422 and RS-423 compliance
• Schottky technology enabling high-speed operation with low power consumption
• Built-in hysteresis for noise immunity in digital data systems
• High input impedance suitable for both single-ended and differential transmission

Applications

• Digital data systems using unipolar or bipolar transmission
• RS-422 compliant simplex bus transmission networks
• Military applications requiring MIL-STD 188-114 compatibility
• Industrial communication interfaces utilizing CCITT recommendations

Procurement Notes

Verify the specific suffix 'M' indicates the military-grade temperature range (-55°C to +125°C) rather than the commercial 'C' grade (0°C to +70°C). Confirm package type matches the SOIC-8 footprint required for surface mount assembly. Ensure ordering documentation aligns with the exact part number to avoid confusion with standard commercial variants.

Selection Notes

Select this component when designing systems requiring robust differential reception under RS-422 protocols. The extended temperature range makes it suitable for harsh environments where standard commercial parts may fail. Consider the ±7V common mode range for applications involving significant ground potential differences between transmitter and receiver nodes.

Part Context

This device belongs to the DS9637A family of dual differential receivers. It serves as a direct functional replacement for older National Semiconductor equivalents within the same interface category. The component integrates Schottky clamping diodes to protect against electrostatic discharge events during normal operation.

Replacement Considerations

Compatible substitutes include the UA9637A series, which shares identical pinouts and electrical specifications. Verify that any alternative maintains the same Schottky output drive strength and input threshold levels to ensure signal integrity across the bus.