CD74HC534E

Overview

The CD74HC534E is a high-speed CMOS logic octal positive-edge-triggered inverting D-type flip-flop with 3-state outputs manufactured by Texas Instruments. It operates within a supply voltage range of 2 V to 6 V and supports a maximum frequency of 28 MHz at nominal voltage. The device features a propagation delay of up to 35 ns and provides output currents of ±7.8 mA. It is housed in a 20-pin PDIP package, measuring 24.33 mm in length, and functions reliably across an extended temperature range from -55 °C to +125 °C.

Feature Summary

• Octal configuration providing eight independent D-type flip-flops within a single integrated circuit
• Positive-edge-triggered data latching mechanism synchronized with clock signal transitions
• Inverting output polarity combined with three-state capability for bus line isolation
• High-speed CMOS technology enabling operation across wide voltage and temperature ranges

Applications

• Parallel data storage and temporary holding in digital processing systems
• Bus interface circuits requiring tri-state isolation and controlled data direction
• Sequential logic design involving clocked state retention and inversion
• Microprocessor memory address latching applications

Procurement Notes

Verify the specific ordering suffix against official Texas Instruments documentation to confirm package type and environmental compliance. Ensure the selected variant matches the required PDIP configuration and operating temperature specifications. Cross-reference the manufacturer part number with authorized distributors to validate authenticity and traceability before procurement.

Selection Notes

Select this component when designing circuits requiring octal parallel data retention with inverted outputs. The 3-state feature allows direct connection to shared data buses without external buffering. Consider the 2 V to 6 V operating range for compatibility with various logic families. Evaluate the 35 ns propagation delay against system timing requirements to ensure adequate setup and hold times are met during operation.

Part Context

This device belongs to the Texas Instruments CD74HC series of high-speed CMOS logic components. The HC designation indicates compatibility with standard 74HC logic levels while offering improved speed over older variants. As an octal flip-flop, it consolidates multiple sequential elements into a single package, reducing board space compared to discrete solutions. The series supports robust performance in industrial and commercial environments.

Replacement Considerations

Consult official substitution guides for equivalent octal D-type flip-flops with 3-state outputs. Verify pinout compatibility and electrical parameter alignment before replacing the component. Ensure that any substitute maintains the same triggering edge and output inversion characteristics to preserve circuit functionality.