SN74HC42N

Overview

The SN74HC42N is a single-function decoder manufactured by Texas Instruments, belonging to the HC logic family. It features four binary inputs and ten active-low outputs, functioning as a 1-of-10 line decoder. The device operates within a supply voltage range of 2 V to 6 V and supports through-hole mounting in a PDIP-16 package. It exhibits a propagation delay of 38 ns and functions reliably across an operating temperature range from -40 °C to +85 °C.

Feature Summary

• Executes decoding of four binary input lines into one of ten active-low output states
• Supports wide supply voltage operation ranging from 2 V to 6 V for flexible system integration
• Provides robust performance with specified propagation delay characteristics under standard conditions

Applications

• Address decoding in microprocessor-based systems
• Control signal generation for peripheral selection
• Memory chip select logic implementation

Procurement Notes

Verify the specific ordering suffix against official Texas Instruments documentation to confirm package type and tape/reel specifications. Ensure compatibility with required operating temperatures and supply voltage ranges before procurement. Cross-reference the manufacturer part number with authorized distributors to confirm current production status and availability constraints.

Selection Notes

Select this component when a 4-to-10 line decoding function is required within the HC logic family. Consider the PDIP-16 package for through-hole assembly requirements. Evaluate the 2 V to 6 V supply voltage range against system power constraints. Compare propagation delay specifications against timing requirements of the target application circuit.

Part Context

This decoder is part of the broader SN74HC series of high-speed CMOS logic devices produced by Texas Instruments. The series provides compatibility with standard TTL logic levels while offering improved speed and lower power consumption compared to older logic families. The HC designation indicates standard CMOS technology optimized for general-purpose digital applications.

Replacement Considerations

SN74HC42DR (SOIC-16 surface mount variant)

FAQ

What is the logic function of the SN74HC42N?

It functions as a 4-line to 10-line decoder with active-low outputs.

Does the SN74HC42N have internal pull-up resistors?

No, the datasheet does not specify internal pull-up resistors for the inputs or outputs.