SN74HC148NSR

Overview

The SN74HC148NSR is an active-low 8-line to 3-line priority encoder from the Texas Instruments 74HC series. It encodes eight data inputs into a 3-bit binary code, prioritizing higher-order lines. The device operates on a single power supply ranging from 2V to 6V and features low input current of 1μA maximum. It includes enable input (EI) and output enable (EO) signals for cascading multiple stages without external circuitry. Typical propagation delay is 16ns, with outputs capable of driving up to 10 LSTTL loads.

Feature Summary

• Encodes eight active-low data lines into a 3-line binary octal code with priority decoding
• Includes dedicated enable input (EI) and output enable (EO) signals for multi-stage expansion
• Outputs are compatible with driving up to 10 LSTTL loads

Applications

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

Procurement Notes

Verify that the component matches the SN74HC148NSR designation and SOP-16 package configuration. Confirm RoHS compliance and check the moisture sensitivity level rating before assembly. Ensure the operating temperature range aligns with system requirements, as this specific part supports -40°C to 85°C. Cross-reference the manufacturer's orderable addendum for any recent packaging or material updates.

Selection Notes

Select this component when an 8-input priority encoder is required within the 74HC logic family. It is suitable for applications needing to convert multiple active-low signals into a compact 3-bit binary representation. Consider the 2V to 6V supply voltage range and the ability to cascade units using internal EO/EI pins for expanding input capacity beyond eight lines.

Part Context

This device belongs to the SNx4HC148 family of high-speed CMOS logic components manufactured by Texas Instruments. It is part of the broader 74HC series, designed for general-purpose digital logic applications. The NS package variant specifically denotes a small-outline package with a 5.30mm width, distinct from SOIC or PDIP options available in the same functional family.

Replacement Considerations

SN74HC148DR

FAQ

How does the SN74HC148NSR handle multiple simultaneous active inputs?

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

Can multiple SN74HC148NSR units be connected to increase input capacity?

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