CD74HC377PW

Overview

The CD74HC377PW is a high-speed CMOS octal D-type flip-flop manufactured by Texas Instruments. It features eight independent D-type flip-flops with a common clock and data enable input, packaged in a 20-TSSOP (0.173", 4.40mm Width) surface-mount package. The device operates within a supply voltage range of 2V to 6V. Key electrical parameters include a propagation delay of 160 ns, a high-level output current of -5.2 mA, and a low-level output current of 5.2 mA. It supports through-hole or surface-mount installation styles depending on the specific variant, with an operating temperature range typically spanning from -40°C to +85°C.

Feature Summary

• Octal configuration providing eight independent D-type flip-flops sharing a single clock signal
• Data Enable input allows simultaneous loading of all flip-flops when activated
• High-speed CMOS technology ensures balanced propagation delays and transition times
• Non-inverting output polarity maintains logical state consistency across all channels

Applications

• Parallel-to-serial data conversion circuits
• General-purpose register storage applications
• Shift register implementations requiring multiple bit stages
• Digital logic systems utilizing common clock synchronization

Procurement Notes

Verify the exact package dimensions and pinout against the official CD74HC377 datasheet before integration. Confirm that the 20-TSSOP footprint matches your PCB layout requirements. Ensure supply voltage levels remain within the specified 2V to 6V range during operation. Check for any specific handling precautions related to static-sensitive CMOS devices during assembly.

Selection Notes

Select this component when an octal D-type flip-flop with a shared clock and enable function is required. The HC series offers significant power reduction compared to LSTTL while maintaining compatible speeds. Consider the TSSOP package for space-constrained surface-mount designs. Verify compatibility with existing logic families if interfacing with TTL-level inputs, noting that HC inputs are not TTL-compatible without level shifting.

Part Context

The CD74HC377 belongs to Texas Instruments' SN74HC and CD74HC logic families, which are designed for high-speed digital applications. It is part of a broader family of octal flip-flops, including variants like the SN74HC377 and CD74HCT377. These components are widely used in general-purpose logic ICs for memory storage and data transfer operations in consumer electronics and industrial control systems.

FAQ

Does the CD74HC377 have separate clocks for each flip-flop?

No, the CD74HC377 features a buffered clock (CP) that is common to all eight flip-flops, allowing them to be loaded simultaneously.

What is the function of the Data Enable input?

The Data Enable input controls whether the flip-flops accept data. When enabled, all flip-flops load their respective D-input states on the active clock edge.