CD74HCT273E

Overview

The CD74HCT273E is an octal D-type flip-flop manufactured by Texas Instruments, originally part of the Harris Corporation product lineage. It features eight non-inverting outputs with a master reset function, triggered on the positive edge of the clock signal. The device operates within a supply voltage range of 4.5V to 5.5V and utilizes a 20-pin DIP package for through-hole mounting. Key electrical parameters include a maximum propagation delay of 30ns at 4.5V with 50pF load, output drive currents of 4mA for both high and low states, and a static current consumption of 4µA. It supports a clock frequency up to 80 MHz and functions across a temperature range of -55°C to 125°C.

Feature Summary

• Contains eight independent D-type flip-flops with positive-edge triggering and a common master reset input.
• Provides non-inverting outputs with standard CMOS drive capabilities suitable for TTL-compatible loads.
• Operates reliably within a wide industrial temperature range and supports high-speed clocking frequencies.

Applications

• Octal data storage and register applications in digital systems
• Shift register configurations for serial-to-parallel data conversion
• State machine implementation requiring multiple synchronized memory elements

Procurement Notes

Verify manufacturer origin as Texas Instruments despite historical Harris association. Confirm package type is 20-DIP and check RoHS compliance status. Ensure replacement parts match pinout and electrical specifications if sourcing alternatives due to availability constraints.

Selection Notes

Select this component when eight synchronized D-type flip-flops are required in a through-hole DIP package. It is suitable for designs needing 4.5V to 5.5V operation with moderate speed requirements up to 80 MHz. Consider thermal management for high-temperature environments exceeding 85°C.

Part Context

This component belongs to the 74HCT logic family, offering CMOS density with TTL-compatible inputs. Originally associated with Harris Corporation before its semiconductor division was acquired by Texas Instruments, it remains a standard octal flip-flop solution for legacy and new designs requiring robust digital storage.

Replacement Considerations

Public confirmed substitute: SN74HCT273N (Texas Instruments). Verify pin compatibility and electrical characteristics before substitution.

FAQ

What is the trigger type for the CD74HCT273E?

The device uses positive-edge triggering for all eight flip-flops.

Does the CD74HCT273E have a reset function?

Yes, it includes a master reset input that clears all outputs simultaneously.