CD74HCT154EN

Overview

The CD74HCT154EN is a high-speed CMOS logic device functioning as a 4-to-16-line decoder/demultiplexer. It accepts four binary address inputs to select one of sixteen active-low outputs. The circuit includes two enable inputs that must be low to activate the selected output; otherwise, all outputs remain high. This component operates within a supply voltage range of 4.5 V to 5.5 V and supports an industrial temperature range from -55°C to +125°C. It utilizes a 24-pin DIP package.

Feature Summary

• Provides decoding of four-bit binary addresses into sixteen mutually exclusive active-low outputs
• Features dual enable inputs for gating functionality and system expansion capabilities
• Compatible with LSTTL logic standards for direct interface without level shifting
• Offers significant power reduction compared to equivalent LSTTL integrated circuits

Applications

• Memory address decoding in computer systems
• Data routing and signal distribution networks
• Industrial control logic interfaces
• Process automation monitoring systems

Procurement Notes

Verify the specific suffix 'EN' corresponds to the Texas Instruments PDIP-24 package configuration. Confirm RoHS compliance status and lead-free material declarations against current manufacturer documentation. Ensure the ordering part number matches the exact speed grade and temperature rating required for the target application environment before finalizing procurement orders.

Selection Notes

Select this component when interfacing with LSTTL-compatible logic families requiring wide operating temperature stability. The HCT series ensures TTL input voltage levels are correctly interpreted by the CMOS internal circuitry. Consider the 24-pin DIP form factor for through-hole prototyping or legacy board designs where surface mount options are unsuitable for mechanical constraints.

Part Context

This device belongs to the Texas Instruments 74HCT logic family, designed for high-speed operation with CMOS power efficiency. It serves as a standard digital logic solution for expanding address lines or distributing single data streams across multiple destinations. The component integrates ESD protection mechanisms to enhance reliability during handling and operation in sensitive electronic environments.

Replacement Considerations

CD74HC154EN

FAQ

How do the enable inputs function during demultiplexing?

One enable input acts as the data input while the other remains low. The selected output follows the data input state only when both enables allow activation.

What is the output polarity of the decoder?

All sixteen outputs are active-low, meaning the selected line goes low while unselected lines remain high.