CY74FCT257CTSOCT

Overview

The CY74FCT257CTSOCT is a CMOS logic component from the FCT series manufactured by Texas Instruments. It functions as a quad 1-of-2 data selector/multiplexer with three-state outputs. The device features an SOIC-20 package and operates within a supply voltage range of 4.75 V to 5.25 V. Key electrical parameters include a propagation delay of 6 ns, low-level output current of 64 mA, and high-level output current of -32 mA. It supports TTL input levels and operates across a temperature range of -40°C to +85°C.

Feature Summary

• Quad multiplexer architecture providing four independent 2-input selection channels
• Three-state outputs enabling direct bus line interfacing and system isolation
• CMOS construction ensuring low static power consumption and high noise immunity

Applications

• Data routing in digital communication systems
• Address/data bus switching in microprocessor-based designs
• Signal selection in test and measurement equipment

Procurement Notes

Verify the specific suffix 'CTSOCT' against the manufacturer's official datasheet to confirm the tape-and-reel packaging configuration and temperature grade. Ensure the ordering part number matches the exact pinout and electrical specifications required for your circuit design. Cross-reference with authorized distributors to validate authenticity and traceability documentation.

Selection Notes

Select this component when a compact quad multiplexer with three-state capability is required for 5V logic systems. The FCT series offers faster switching speeds compared to standard FCT devices while maintaining CMOS power efficiency. Verify that the SOIC-20 package fits the available PCB footprint and that the 64 mA sink current meets the load requirements of the destination circuits.

Part Context

This part belongs to the Texas Instruments CY74FCT257T family of high-speed CMOS logic devices. The FCT series is designed to bridge the performance gap between older transistor-transistor logic (TTL) and pure CMOS technologies. These components are widely used in industrial and commercial applications requiring reliable signal switching at moderate speeds.

Replacement Considerations

Check for direct cross-reference part numbers such as the CY74FCT257ATD or other variants within the same FCT multiplexer family. Ensure any substitute maintains the same SOIC-20 package, voltage range, and three-state output functionality.