CD74HC4514E

Overview

The CD74HC4514E is a high-speed CMOS 4-to-16 line decoder/demultiplexer manufactured by Texas Instruments. It features four binary weighted address inputs (A0 to A3) with an integrated latch, a latch enable input (LE), and an enable input (E). The device provides sixteen outputs (Q0 to Q15). It operates within a supply voltage range of 2 V to 6 V and supports surface mount installation in SOIC packages. The component functions as a decoder when LE is active or as a demultiplexer using E as the data input.

Feature Summary

• Includes internal address latches that store input data when the latch enable signal transitions from high to low, maintaining stable outputs during subsequent address changes.
• Supports dual functionality as a 4-to-16 decoder for address decoding or as a demultiplexer where the enable pin serves as the data input channel.
• Features input clamp diodes on all pins, allowing limited current flow for input voltages exceeding the supply voltage without damaging the device.

Applications

• Address decoding in microprocessor-based systems
• Data distribution in digital communication circuits
• Memory selection logic in embedded controllers

Procurement Notes

Verify the package type matches the design requirements, as the 'E' suffix typically denotes a DIP package while other suffixes indicate SOIC variants. Confirm RoHS compliance status through official datasheets. Ensure the specific revision aligns with the intended manufacturing timeline. Cross-reference ordering information with authorized distributors to avoid obsolete stock.

Selection Notes

Select this component for applications requiring decoded outputs with latched address stability. The HC series offers compatibility with standard CMOS logic levels. Consider the propagation delay and operating temperature range (-55°C to +125°C) for harsh environments. Verify power supply constraints fit within the 2V to 6V operational window before finalizing the design.

Part Context

This part belongs to the Texas Instruments CD74HC4514 family of high-speed CMOS logic devices. It is functionally compatible with industry-standard 74HC4514 specifications. The device is designed for general-purpose digital logic applications requiring reliable decoding and demultiplexing capabilities within standard commercial and industrial temperature ranges.

Replacement Considerations

Compatible substitutes include SN74HC4514 and SN74HCT4514. Verify pinout compatibility and electrical characteristics such as output drive current and propagation delay. Ensure the replacement variant supports the required supply voltage and package style for the existing PCB layout.