CD74HCT74ME4

Overview

The CD74HCT74ME4 is a high-speed CMOS dual positive-edge-triggered D-type flip-flop manufactured by Texas Instruments. It features asynchronous set and reset inputs, allowing independent control of the output state. The device operates within a supply voltage range of 4.5V to 5.5V and supports clock frequencies up to 25MHz. Key electrical parameters include a maximum propagation delay of 35ns at 4.5V with a 50pF load and a quiescent current of 4µA. It is housed in a 14-SOIC surface-mount package and functions reliably across an extended temperature range from -55°C to +125°C.

Feature Summary

• Dual positive-edge-triggered D-type flip-flop architecture with independent set and reset controls
• High-speed CMOS technology supporting operation up to 25MHz clock frequency
• Extended industrial temperature rating for reliable performance in harsh environments

Applications

• Data storage and register circuits requiring parallel-to-serial conversion
• Shift registers for serial data transmission and processing
• Timing and sequencing logic in digital control systems

Procurement Notes

Verify that the ordering suffix 'E4' corresponds to the specific tape-and-reel packaging configuration required for automated assembly processes. Confirm RoHS compliance status matches current environmental regulations for your region. Ensure the 14-SOIC footprint dimensions align with your PCB layout constraints before finalizing procurement orders.

Selection Notes

Select this component when asynchronous preset and clear functions are necessary alongside standard D-type toggling. The HCT series compatibility ensures direct interfacing with TTL logic levels without additional level shifting. Consider the 14-SOIC package size if space-constrained surface-mount applications require a compact dual flip-flop solution with wide operating temperature capabilities.

Part Context

This part belongs to the Texas Instruments CD74HCT family of high-speed CMOS logic devices. It provides dual functionality within a single package, reducing board space compared to single flip-flop alternatives. The HCT designation indicates compatibility with standard TTL input voltages, facilitating integration into mixed-logic systems where CMOS outputs drive TTL inputs.

Replacement Considerations

Cross-reference with other CD74HCT74 variants from Texas Instruments or equivalent manufacturers offering identical pinouts and logical functions. Verify that any substitute maintains the same 14-SOIC package dimensions and extended temperature range specifications to ensure mechanical and thermal compatibility.