SN74HC148DWR

Overview

The SN74HC148DWR is an 8-line to 3-line priority encoder manufactured by Texas Instruments. It encodes eight active-low data inputs into a 3-bit binary code with active-low outputs. The device operates within a supply voltage range of 2V to 6V and features low input current (1μA max) and low power consumption (80-μA max ICC). It includes enable input (EI) and output enable (EO) signals for cascading multiple stages without external circuitry. Typical propagation delay is 16ns, and it can drive up to 10 LSTTL loads.

Feature Summary

• Encodes eight active-low data lines to three-line binary (octal) with priority decoding
• Includes enable input (EI) and output enable (EO) signals for cascading multiple stages
• Outputs can drive up to 10 LSTTL loads
• Low power consumption with 80-μA maximum supply current

Applications

• N-Bit encoding
• Code converters and generators

Procurement Notes

Verify the specific ordering suffix 'DWR' corresponds to the SOIC-16 package and tape-and-reel packaging configuration. Confirm RoHS compliance and lead finish details via the manufacturer's orderable addendum. Ensure the application environment stays within the recommended operating temperature range of -40°C to +85°C. Check for any recent Product Change Notifications (PCN) regarding material or manufacturing site updates.

Selection Notes

Select this component when an 8-input priority encoder is required in a CMOS logic family. It is suitable for applications needing to encode multiple active-low signals into a 3-bit binary representation. Consider its 2V to 6V operating voltage range and ability to interface with LSTTL loads. Verify that the SOIC-16 surface-mount package fits the board layout constraints.

Part Context

The SN74HC148DWR belongs to the SNx4HC148 series of 8-Line to 3-Line Priority Encoders from Texas Instruments. It is part of the HC (High-speed CMOS) logic family, designed for general-purpose digital applications. The 'DWR' suffix indicates a specific package type (SOIC-16) and reel quantity configuration offered by the manufacturer.

Replacement Considerations

SN74HC148DR

FAQ

How does the SN74HC148 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 SN74HC148 devices be connected together?

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