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Product Detailed Parameters
- Description：IC DECODER/DEMUX 1X3:8 16DIP
- Series：74HC
- Mfr：Texas Instruments
- Package：Tube
- Type：Decoder/Demultiplexer
- Circuit：1 x 3:8
- Independent Circuits：1
- Current - Output High, Low：5.2mA, 5.2mA
- Voltage Supply Source：Single Supply
- Voltage - Supply：2V ~ 6V
- Operating Temperature：-40°C ~ 85°C
- Mounting Type：Through Hole
- Package / Case：16-DIP (0.300", 7.62mm)
- Supplier Device Package：16-PDIP
- Grade：-
- Qualification：-
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Overview
The SN74HC138N is a 3-to-8 decoder and demultiplexer manufactured by Texas Instruments in the HC logic family. It operates within a supply voltage range of 2 V to 6 V and features three binary inputs (A, B, C) to select one of eight active-low outputs. The device includes three enable inputs: two active-low (G2A, G2B) and one active-high (G1). It provides balanced output drive capabilities with ±4 mA at 5 V and low power consumption of 80 µA maximum ICC.
Feature Summary
- Features three binary inputs to select a single active-low output from eight available lines.
- Incorporates three enable pins to simplify cascading or data reception applications.
- Designed for high-speed memory decoders and data-transmission systems requiring short propagation delays.
Applications
- LED Displays
- Servers
- White Goods
Procurement Notes
Verify the specific package type and manufacturer against the datasheet specifications before procurement. Confirm that the component meets the required operating temperature range and electrical characteristics for the intended application environment.
Selection Notes
Select this component for designs requiring high-performance memory decoding or data routing where minimal system delay is critical. Ensure the design accommodates the specified input transition rise/fall times and utilizes appropriate bypass capacitors near the VCC terminal to prevent power disturbances.
Part Context
This device belongs to the SNx4HC138 series of 3-line to 8-line decoders/demultiplexers. It is designed to minimize system decoding effects in high-performance memory systems when used with fast enable circuits. The device allows expansion to larger decoders without external inverters.
Replacement Considerations
SN74HC138D
FAQ
How many enable inputs does the SN74HC138N have?
The device incorporates three enable inputs: two active-low (G2A and G2B) and one active-high (G1).
What is the function of the selected output?
When enabled, the selected output is pulled LOW, while all remaining outputs remain HIGH.
