Home > Industry Information > Introduction To SN74HC148DR
SN74HC148DR is a TI-manufactured 8-to-3 priority encoder belonging to 74HC high-speed logic series. It converts eight multi-channel input signals into 3-bit binary encoded signals with built-in input priority judgment.
Category:Integrated Circuits (ICs),Logic,Signal Switches, Multiplexers, Decoders
Current - Output High, Low:5.2mA, 5.2mA
Manufacturer:Texas Instruments
Voltage Supply Source:Single Supply
Series:74HC
Voltage - Supply:2V ~ 6V
Packaging:Tape & Reel
Operating Temperature:-40°C ~ 85°C
Part Status:Active
Mounting Type:Surface Mount
Type:Priority Encoder
Package / Case:16-SOIC (0.154", 3.90mm Width)
Circuit:1 x 8:3
Independent Circuits:1
Priority Coding:The chip supports 8-channel low-level active input encoding with fixed priority rules. It preferentially identifies and encodes the highest-priority input signal I7 to avoid signal conflict.
Wide Voltage:It adopts single power supply design with a working voltage range of 2V to 6V. The wide voltage design adapts to most mainstream digital circuit power supply standards.
Low Power:The device features extremely low quiescent current and input leakage current. It can effectively reduce power consumption and is suitable for battery-powered portable electronic equipment.
Fast Response:It has a short typical signal propagation delay of 16ns. It can complete high-speed signal encoding and conversion to meet the needs of high-frequency digital circuits.
Strong Drive:It has 5.2mA balanced high and low level output driving current. It can directly drive multiple LSTTL loads with strong load capacity and good compatibility.
Cascade Expand:It is equipped with dedicated enable input and output pins. Multiple chips can be cascaded to expand encoding channels without additional auxiliary logic chips.
MCU Interrupt:It encodes 8-way external interrupt trigger signals into 3-bit binary signals. It greatly saves the GPIO port resources of single-chip microcontrollers and realizes multi-channel interrupt monitoring.
Sensor Alarm:It processes acquisition signals from 8-channel NTC temperature sensors. It outputs corresponding binary codes to quickly locate equipment over-temperature and other fault points.
Keyboard Scan:It completes signal encoding of 8-key independent or matrix keyboards. It reduces the occupation of main control chip IO ports and simplifies keyboard circuit design.
Code Generator:It builds a stable octal-to-binary conversion functional module. It is widely used in digital circuit experiment boards and electronic teaching training equipment.
Industrial IO:It compresses and encodes 8-way industrial equipment status feedback signals. It assists PLC terminals to efficiently collect and judge multi-channel equipment operating states.
Signal Multiplex:It realizes multi-chip cascade expansion through reserved cascade pins. It supports 16/24-channel signal encoding and meets the encoding needs of multi-channel detection equipment.
SN74HC148DR balances low power, fast speed and wide voltage, serving as a cost-effective 8-channel priority encoding solution. It simplifies multi-signal hardware design and remains widely used in embedded, industrial control and digital teaching equipment.
Industry Information
