SN74HC148DG4

Overview

The SN74HC148DG4 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 active-low inputs and outputs. The device encodes eight data lines into 3-line binary (octal) format with priority decoding logic. Key electrical parameters include a typical propagation delay of 16ns, low input current of 1μA max, and output drive capability up to 10 LSTTL loads. It consumes 80-μA maximum ICC and provides ±4-mA output drive at 5V.

Feature Summary

• Encodes eight data lines to 3-line binary (octal) with priority decoding
• Includes enable input (EI) and output enable (EO) signals for cascading multiple stages without external circuitry
• Outputs can drive up to 10 LSTTL loads

Applications

• N-Bit encoding
• Code converters and generators

Procurement Notes

Verify the specific package type and reel quantity against the orderable addendum in the datasheet. Confirm RoHS compliance and lead finish details. Ensure the ordering suffix matches the required tape and reel specifications. Check for any recent documentation updates or revisions that may affect part availability or pinout configurations.

Selection Notes

Select this component when an 8-input priority encoder is required for digital logic applications. Consider the HC logic family for compatibility with standard CMOS levels. Evaluate the operating temperature range (-40°C to 85°C) against environmental conditions. Verify power supply constraints fit within the 2V to 6V range.

Part Context

The SN74HC148DG4 belongs to the SNx4HC148 series of 8-Line to 3-Line Priority Encoders from Texas Instruments. It is part of the broader 74HC logic family, designed for high-speed CMOS operations. The 'DG4' suffix indicates a specific SOIC package variant with lead-free construction, suitable for surface-mount assembly.

Replacement Considerations

SN74HC148DRG4

FAQ

How does the SN74HC148DG4 handle cascading?

It uses added input enable (EI) and output enable (EO) signals to allow cascading multiple stages without additional external circuitry.

What is the logic level of the inputs and outputs?

Data inputs and outputs are active at the low logic level.