SN74HC148DT

Overview

The SN74HC148DT is an 8-line to 3-line priority encoder manufactured by Texas Instruments. It operates within a supply voltage range of 2V to 6V and features a typical propagation delay of 16ns. The device provides ±4-mA output drive capability at 5V and maintains low power consumption with a maximum ICC of 80μA. It utilizes a 16-pin SOIC package.

Feature Summary

• Encodes eight active-low data inputs into a 3-bit binary code with priority decoding
• Includes enable input (EI) and enable output (EO) signals for cascading multiple stages without external circuitry
• Outputs are capable of driving up to 10 LSTTL loads

Applications

• N-Bit encoding systems
• Code converters
• Code generators

Procurement Notes

Verify the specific ordering suffix 'DT' against the manufacturer's current orderable addendum to confirm the exact package type, lead finish, and moisture sensitivity level. Ensure that the selected variant aligns with the required thermal resistance and reflow temperature profiles for the intended assembly process.

Selection Notes

Select this component when designing circuits requiring octal priority encoding with cascading capabilities. Consider the 2V to 6V operating range and the -40°C to 85°C temperature rating. Verify that the 16-pin SOIC package dimensions fit the available board space and that the logic levels match the system requirements.

Part Context

This part belongs to the SNx4HC148 family of 8-line to 3-line priority encoders. It is designed for applications where only the highest-order active input needs to be encoded. The HC series offers wide voltage operation and CMOS technology, making it suitable for general-purpose digital logic designs.

Replacement Considerations

SN74HC148DR

FAQ

How does the SN74HC148DT handle multiple active inputs?

It performs priority decoding, ensuring that only the highest-order active data line is encoded into the 3-bit binary output.

Can multiple SN74HC148DT devices be used together?

Yes, the device includes enable input (EI) and enable output (EO) signals that allow for cascading multiple stages without additional external circuitry.