CY74FCT138ATQC

Overview

The CY74FCT138ATQC is a high-speed CMOS 1-of-8 decoder manufactured by Texas Instruments. It belongs to the FCT logic series and operates within a supply voltage range of 4.75 V to 5.25 V. The device features three address inputs and eight active-low outputs, with two enable inputs for control. It utilizes an SSOP-16 surface-mount package and supports soldering via SMD/SMT installation methods. The component exhibits a propagation delay of 6 ns and functions reliably across an industrial temperature range from -40°C to +85°C.

Feature Summary

• Provides one-hot decoding functionality converting three binary address lines into eight distinct active-low output signals.
• Incorporates dual enable inputs that allow precise synchronization and gating of the decoding operation.
• Delivers fast switching performance with a propagation delay of 6 ns suitable for high-speed digital systems.

Applications

• Address decoding in microprocessor-based memory subsystems
• Control signal generation for peripheral interface circuits
• Data routing within digital communication equipment

Procurement Notes

Verify the specific suffix against official documentation to confirm pinout compatibility and electrical characteristics. Ensure the procurement channel provides valid manufacturer traceability. Confirm moisture sensitivity handling requirements are met during storage and assembly processes.

Selection Notes

Select this component when a single-channel 1-of-8 decoding function is required within standard 5V logic environments. Consider the SSOP-16 package constraints regarding board space and thermal dissipation capabilities. Evaluate the 6 ns delay against system timing budgets to ensure adequate setup and hold times are maintained.

Part Context

This part is a member of the Texas Instruments CY74FCT family, designed for high-performance applications requiring low power consumption and fast switching speeds. The FCT series bridges the gap between older TTL standards and modern CMOS technologies, offering improved noise immunity and density while maintaining compatible logic levels.

Replacement Considerations

Consult official substitution guides for verified equivalents. Generic cross-references may differ in pin configurations or electrical limits.