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Product Detailed Parameters
- Description：IC DECODER/DEMUX 1 X 2:4 16SO
- Series：74HC
- Mfr：Texas Instruments
- Package：Tape & Reel (TR),Cut Tape (CT)
- Type：Decoder/Demultiplexer
- Circuit：1 x 2:4
- Independent Circuits：2
- 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：Surface Mount
- Package / Case：16-SOIC (0.209", 5.30mm Width)
- Supplier Device Package：16-SO
- Grade：-
- Qualification：-
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Overview
The SN74HC139NSR is a dual 2-line to 4-line decoder/demultiplexer from the Texas Instruments HC logic family. It operates within a supply voltage range of 2 V to 6 V and supports an operating temperature range of -40°C to 85°C. The device features a typical propagation delay of 10 ns, with maximum delays reaching 44 ns at 4.5 V. It provides ±4-mA output drive capability at 5 V and incorporates two enable inputs for simplified cascading or data reception.
Feature Summary
- Designed specifically for high-speed memory decoders and data-transmission systems
- Incorporates two active-low enable inputs to simplify cascading and data reception
- Outputs can drive up to 10 LSTTL loads
Applications
- High-performance memory decoding
- Data-routing applications
- Data-transmission systems
Procurement Notes
Verify that the ordering suffix 'SR' corresponds to the SO (NS) package type and tape-and-reel carrier configuration as listed in the TI Package Option Addendum. Confirm RoHS compliance status and moisture sensitivity level ratings prior to procurement to ensure compatibility with assembly processes.
Selection Notes
Select this component when low power consumption and wide operating voltage are required. The fully buffered inputs represent only one normalized load to the driving circuit. Ensure unused inputs are connected to logic high or low voltages to prevent undefined operational states.
Part Context
This part belongs to the SNx4HC139 series, which contains two individual 2-line to 4-line decoders in a single package. The series is designed for applications requiring very short propagation delay times to minimize system decoding effects in high-performance memory systems.
Replacement Considerations
SN74HC139N
FAQ
How does the active-low enable input function?
When the outputs are gated by the strobe input, they are all forced into the high state. When not disabled, only the selected output is low while all others remain high.
What is the recommended bypass capacitor value?
A 0.1-μF capacitor is recommended for each VCC terminal to prevent power disturbance, installed as close to the power terminal as possible.
