5477DM

Overview

The 5477DM is a four-bit D-type latch manufactured by National Semiconductor. It operates within the TTL logic family and contains one functional unit. The device is designed for digital data storage applications, providing parallel data output based on serial input control signals.

Feature Summary

• Four-bit data storage capability
• TTL logic compatibility
• Single functional unit configuration

Applications

• Digital data storage systems
• Parallel-to-serial conversion circuits
• Register stages in digital logic designs

Procurement Notes

Verify the manufacturer designation as National Semiconductor or Texas Instruments, as National Semiconductor's semiconductor division was acquired by TI. Confirm the specific suffix 'DM' indicates the correct package and temperature range variant. Request official datasheets to validate electrical characteristics against application requirements.

Selection Notes

Select this component when a four-bit latch with TTL compatibility is required. Ensure the design environment supports standard TTL voltage levels. Consider pinout compatibility if replacing existing circuitry. Verify that the single functional unit architecture meets the system's data width requirements without needing additional cascading.

Part Context

National Semiconductor produced a wide range of digital logic devices before its acquisition by Texas Instruments. The 5477 series belongs to their standard TTL product line, widely used in legacy computing and industrial control systems. This part represents a fundamental building block for sequential logic circuits.

Replacement Considerations

Check for direct equivalents from Texas Instruments under the same numbering scheme. Verify pin compatibility and logical function equivalence before substitution.