CD74HCT377E

Overview

The CD74HCT377E is an octal D-type flip-flop manufactured by Texas Instruments, belonging to the HCT logic series. It features eight independent positive-edge-triggered circuits in a single package. The device operates within a supply voltage range of 4.5 V to 5.5 V and accepts TTL-compatible inputs. Key electrical parameters include a maximum propagation delay of 38 ns at 4.5 V with 50 pF load, static current of 8 µA, and output drive currents of ±4 mA. It supports a clock frequency up to 50 MHz and functions reliably across an extended temperature range from -55°C to +125°C.

Feature Summary

• Contains eight independent positive-edge-triggered D-type flip-flops for parallel data storage
• Features TTL-compatible input levels for direct interfacing with TTL systems
• Provides non-inverting outputs with standard CMOS drive capability
• Supports operation over an extended industrial temperature range

Applications

• Parallel data storage and buffering in digital systems
• Shift register construction for serial-to-parallel conversion
• Register file implementation in microprocessor-based designs
• Timing synchronization and state holding applications

Procurement Notes

Verify that the specific part number matches the required PDIP-20 through-hole package configuration. Confirm that the HCT logic family compatibility aligns with the system's voltage and interface requirements. Ensure the extended temperature rating meets environmental specifications. Check RoHS compliance status against project regulations. Validate pinout compatibility if replacing existing components in legacy designs.

Selection Notes

Select this component when eight independent D-type flip-flops are required in a single package. Choose the HCT series for TTL input compatibility with CMOS outputs. Opt for the PDIP-20 package for through-hole mounting on printed circuit boards. Consider the 38 ns propagation delay and 50 MHz clock limit for timing analysis. Verify that the 4.5 V to 5.5 V supply range suits the target power distribution network.

Part Context

This device is part of the SN74/CD74HCT377 family of octal D-type flip-flops. It shares functional characteristics with other members of the 74HCT series, offering high-speed CMOS performance with TTL-compatible inputs. The E suffix denotes the PDIP-20 through-hole package variant. It complements latch devices like the 74HCT573 by providing edge-triggered rather than level-sensitive operation for sequential logic applications.

Replacement Considerations

Direct substitutes include SN74HCT377N and CD74HCT377M96, which share identical logical functionality but differ in package type or manufacturing revision. Verify pinout compatibility before substitution. Ensure that any replacement maintains the same HCT logic family characteristics and operating voltage ranges.