CD74FCT574TQM

Overview

The CD74FCT574TQM is an octal edge-triggered D-type flip-flop manufactured by Harris Corporation. It features positive-edge triggering and three-state outputs, housed in a 20-pin SSOP package with dimensions of 0.154 inches (3.90mm) width. The device operates within a supply voltage range of 4.75V to 5.25V and supports a temperature range of 0°C to 70°C. Key electrical characteristics include a maximum propagation delay of 10ns, high-level output current of -32mA, and low-level output current of 64mA. Input capacitance is specified at 10pF.

Feature Summary

• Octal configuration providing eight independent D-type registers in a single package
• Positive-edge clock triggering for precise data synchronization
• Three-state outputs allowing direct system bus interconnection
• CMOS technology ensuring compatibility with TTL input levels

Applications

• Parallel-to-serial data conversion circuits
• Buffering and latching operations in digital systems
• High-speed register applications requiring fast switching speeds
• Data storage elements in microprocessor-based interfaces

Procurement Notes

Verify the manufacturer designation as Harris Corporation, noting that Texas Instruments also produces similar CY74FCT series parts which may share pinouts but differ in specific electrical parameters or packaging details. Confirm the suffix 'TQM' corresponds to the 20-SSOP package variant. Ensure compliance with RoHS status requirements, as older Harris production may not meet current environmental standards. Cross-reference datasheet specifications against current inventory sources to confirm availability and authenticity.

Selection Notes

Select this component when an octal register with fast propagation delay is required for high-speed digital designs. The three-state output capability facilitates efficient bus sharing without additional control logic. Consider the 20-SSOP package size for space-constrained PCB layouts. Verify that the operating temperature range of 0°C to 70°C meets the environmental conditions of the target application. Compare performance metrics against alternative FCT series devices if higher density or different package options are needed.

Part Context

This device belongs to the FCT (Fast CMOS) logic family, designed for high-speed operation with CMOS power consumption. It serves as a fundamental building block for sequential logic circuits, offering reliable data retention and fast transition times. The part is historically associated with Harris Corporation's semiconductor division, which was later acquired by Intersil and subsequently by Renesas Electronics, affecting long-term supply chain considerations.

Replacement Considerations

The CY74FCT574TSOC from Texas Instruments is a public confirmed substitute with identical logical function and pinout. Verify package compatibility between SSOP and SOIC variants if physical footprint changes are acceptable. Check for minor differences in electrical specifications such as leakage currents or drive strengths between the Harris and TI versions.