CD74HC238PWRE4

Overview

The CD74HC238PWRE4 is a high-speed CMOS logic decoder and demultiplexer manufactured by Texas Instruments. It features three binary address inputs and eight active-low data outputs, enabling the selection of one specific output line based on the input code. The device operates within a supply voltage range of 2V to 6V and supports surface-mount installation in a TSSOP-16 package. It includes two active-low enable inputs and one active-high enable input for chip control. The component is designed for operation across an extended temperature range from -55°C to +125°C.

Feature Summary

• Provides 3-to-8 line decoding functionality with active-low outputs
• Features dual active-low and single active-high enable inputs for flexible control
• Supports wide operating voltage range from 2V to 6V
• Rated for extended industrial temperature environments up to 125°C

Applications

• Address decoding in microprocessor-based systems
• Data routing and signal distribution in digital circuits
• Memory chip select generation
• Peripheral device selection in embedded controllers

Procurement Notes

Verify the E4 suffix indicates lead-free composition and RoHS compliance per manufacturer standards. Confirm the PWRE4 designation corresponds to the TSSOP-16 package variant. Ensure compatibility with existing PCB footprints and soldering profiles. Check for any specific handling requirements related to moisture sensitivity levels defined in the datasheet.

Selection Notes

Select this component when a 3-to-8 decoder with active-low outputs is required in a compact surface-mount form factor. The HC series offers standard CMOS performance suitable for general-purpose logic applications. Consider the enable pin configuration if complex gating logic is needed. Verify that the 2V to 6V supply range matches the system power rails.

Part Context

This part belongs to the Texas Instruments CD74HC238 family of high-speed CMOS logic devices. The 'E4' suffix typically denotes environmental compliance, specifically lead-free construction. It shares functional compatibility with other variants in the 74HC238 series, differing primarily in packaging and manufacturing revisions. The device is part of the broader 74HC logic family known for wide voltage operation.

Replacement Considerations

CD74HC238PWR

FAQ

What is the function of the enable inputs?

The device has two active-low enable inputs (G1, G2) and one active-high enable input (G3). All enables must be in their active states for the decoder to function; otherwise, all outputs remain inactive.

Is the output polarity inverted?

Yes, the CD74HC238 provides eight active-low outputs. When a specific address is selected, the corresponding output goes low while others remain high.