CY74FCT257CTQCT

Overview

The CY74FCT257CTQCT is an octal D-type transparent latch manufactured by Texas Instruments. It belongs to the FCT logic series and features a non-inverting output polarity. The device operates within a supply voltage range of 4.75 V to 5.25 V and supports a propagation delay of 4.7 ns at 5 V. It provides a low-level output current of 32 mA and a high-level output current of -15 mA. The component is housed in a QSOP-20 package, designed for surface mount installation, and functions across a temperature range of -40°C to +85°C.

Feature Summary

• Octal D-type transparent latch architecture with eight independent data channels
• High-drive capability supporting significant low-level and moderate high-level output currents
• Fast switching performance characterized by low propagation delay times

Applications

• Parallel data storage in digital systems
• Bus interface buffering applications
• Register stages in microprocessor-based designs

Procurement Notes

Verify the specific suffix CTQCT against official Texas Instruments documentation to confirm the exact package variant and moisture sensitivity level. Ensure compatibility with standard surface mount assembly processes. Confirm RoHS compliance status through the manufacturer's latest product information sheet before finalizing procurement specifications.

Selection Notes

Select this component when an octal latch with transparent mode operation is required. The FCT series offers CMOS input characteristics with TTL-compatible levels. Consider the QSOP-20 package constraints and thermal management requirements for the specified operating temperature range during circuit design.

Part Context

This part is part of the CY74FCT257T family of logic integrated circuits. It serves as a memory element within the broader Texas Instruments FCT logic portfolio. The device complements other bus transceivers and buffers in the same series, providing distinct latching functionality for data retention tasks.

Replacement Considerations

Consult official substitution guides for equivalent octal latches from the FCT or similar logic families. Verify pinout compatibility and electrical parameter alignment before replacing the original component.