SN74HC148DRE4

Overview

The SN74HC148DRE4 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 supports an operating temperature range of -40°C to 85°C. The device features low power consumption with a maximum ICC of 80μA and typical propagation delay (tpd) of 16ns. It provides ±4mA output drive at 5V and can drive up to 10 LSTTL loads.

Feature Summary

• Encodes eight data lines into 3-line binary octal code
• Includes enable input (EI) and output enable (EO) signals for cascading multiple stages without external circuitry
• Data inputs and outputs are active at the low logic level

Applications

• N-Bit encoding
• Code converters and generators

Procurement Notes

Verify that the ordering suffix 'E4' corresponds to the specific RoHS-compliant tape and reel packaging configuration documented in the manufacturer's orderable addendum. Confirm the package type matches the required SOIC footprint dimensions before finalizing procurement specifications.

Selection Notes

Select this component when designing systems requiring priority decoding of eight inputs into three-bit binary outputs. Ensure the application environment stays within the specified -40°C to 85°C temperature range and utilizes a supply voltage between 2V and 6V. Consider the low input current and CMOS technology for efficient power management.

Part Context

This part belongs to the SNx4HC148 family of 8-Line to 3-Line Priority Encoders from Texas Instruments. It is designed as a combinational logic circuit where only the highest-order data line is encoded. The device allows for expansion through dedicated enable pins, facilitating multi-stage configurations.

Replacement Considerations

SN74HC148DR

FAQ

How does the device handle multiple simultaneous active inputs?

The device performs priority decoding, ensuring that only the highest-order data line among any simultaneously active inputs is encoded.

What is the function of the EI and EO signals?

The Enable Input (EI) and Enable Output (EO) signals allow for cascading multiple stages of the encoder without the need for additional external circuitry.