CD74ACT74M

Overview

The CD74ACT74M is a high-speed CMOS octal transparent latch manufactured by Harris Corporation. It features three-state outputs and is functionally pin-compatible with the standard 74LS373. The device utilizes silicon gate CMOS technology, offering low power consumption while maintaining the ability to drive multiple LSTTL loads. Key electrical characteristics include a typical propagation delay of 12ns at VCC=5V with CL=15pF. It supports a wide operating temperature range from -55°C to 125°C. The HCT/ACT variants ensure direct LSTTL input logic compatibility with specific voltage thresholds.

Feature Summary

• Octal transparent latch architecture with common latch enable control
• Three-state outputs providing bus line driving capacity
• Buffered inputs for improved signal integrity
• Direct compatibility with standard 74LS logic families

Applications

• Bus-oriented memory mapping
• Clock registers in digital systems
• Working registers for temporary data storage
• Parallel-to-serial conversion circuits

Procurement Notes

Verify the manufacturer origin, as Harris Corporation's semiconductor assets were acquired. Ensure the part number suffix matches the required package type. Confirm that the specific variant meets the necessary voltage and temperature specifications for the intended application environment before procurement.

Selection Notes

Select this component when an octal latch with three-state output is required for bus applications. It is suitable for designs needing compatibility with 74LS logic levels. Consider the propagation delay and power consumption advantages over older TTL technologies. Ensure the operating voltage range aligns with the system's 5V supply requirements.

Part Context

This component belongs to the high-speed CMOS logic family, designed to replace or upgrade legacy 74LS series circuits. It offers significant power reduction compared to LSTTL while maintaining similar performance characteristics. The device is part of a broader range of transparent latches available from various manufacturers under similar naming conventions.

Replacement Considerations

Compatible substitutes include MC74HCT373 and CD74HCT373. These alternatives offer similar functionality and pinout compatibility. Verify that the replacement part supports the required three-state output and operating temperature range.