10422DCQR

Overview

The National Semiconductor 10422DCQR is a high-speed 1K bit ECL (Emitter-Coupled Logic) Static Random-Access Memory (SRAM). It accepts ECL input levels, which are incompatible with standard TTL outputs. Direct connection to TTL risks overdriving inputs and violating absolute maximum ratings.

Feature Summary

• High-speed operation utilizing Emitter-Coupled Logic technology
• Static Random-Access Memory architecture for data retention without refresh cycles

Applications

• High-speed digital systems requiring ECL compatibility
• Memory subsystems in specialized logic applications

Procurement Notes

Verify the component origin as National Semiconductor, now part of Microchip Technology. Confirm the specific suffix DCQR matches the required package and temperature grade. Ensure interface compatibility checks are performed, particularly regarding ECL input level requirements versus TTL incompatibility, to prevent circuit damage from overdriving inputs.

Selection Notes

Select this component only when ECL logic family compatibility is strictly required for the system design. The 1K bit capacity defines the memory depth. Designers must ensure power supplies and signal levels align with ECL specifications. Avoid direct interfacing with TTL outputs due to voltage level mismatches that may violate absolute maximum ratings.

Part Context

This SRAM belongs to the National Semiconductor 10422 series, characterized by ECL technology. National Semiconductor was acquired by Microchip Technology, which continues to manage these legacy product lines. The device represents a specific memory solution for high-speed logic applications prior to widespread CMOS dominance.