74HCT238D,653

Signal Switches, Multiplexers, Decoders Overview

The Nexperia 74HCT238D,653 is a 3-to-8 line decoder and demultiplexer housed in an SO16 (SOT109-1) plastic small outline package. It decodes three binary weighted address inputs to eight mutually exclusive active HIGH outputs. The device operates within a supply voltage range of 4.5 V to 5.5 V. It features three enable inputs: two active LOW (E1, E2) and one active HIGH (E3). Propagation delay from address inputs to outputs is specified at 53 ns maximum under recommended conditions.

Signal Switches, Multiplexers, Decoders Feature Summary

• Decodes three binary weighted address inputs to eight mutually exclusive active HIGH outputs
• Features multiple enable inputs for easy parallel expansion to larger decoding configurations
• Capable of functioning as an eight-output demultiplexer using enable inputs as data strobes
• Inputs include clamp diodes allowing interface to voltages exceeding VCC with current limiting resistors

Signal Switches, Multiplexers, Decoders Applications

• Memory chip select decoding
• Demultiplexing applications utilizing enable inputs as data strobes
• Parallel expansion to 1-of-32 decoding configurations

Signal Switches, Multiplexers, Decoders Procurement Notes

Verify the specific ordering suffix ',653' corresponds to the SO16 package variant when sourcing. Confirm that the HCT logic family requirements match the system's TTL-level input specifications. Ensure the design accommodates the required enable logic states for proper decoder operation.

Signal Switches, Multiplexers, Decoders Selection Notes

Select this component when TTL-compatible input levels are required for the 74HC238 architecture. The SO16 package is suitable for surface mount assembly. Consider the propagation delay characteristics relative to system timing constraints. Verify that the power dissipation limits align with the thermal environment of the application.

Signal Switches, Multiplexers, Decoders Part Context

This part belongs to the 74HCT series, which provides CMOS low power dissipation with noise immunity while maintaining TTL-compatible input levels. The '238 function is standard across the family, differing primarily in electrical characteristics and package options such as TSSOP or DHVQFN.

Signal Switches, Multiplexers, Decoders Replacement Considerations

Direct functional equivalents include the 74HC238D,653, noting the difference between HC and HCT input logic levels. Other package variants like 74HCT238PW or 74HCT238BQ offer the same logical function in different physical footprints.