85504012A
- Mfr.Part #
- 85504012A
- Manufacturer
- Texas Instruments
- Package / Case
- Datasheet
- Download
- Description
- SN54HCT138 3-LINE TO 8-LINE DECO
- Stock
- 9
- In Stock :
- 9
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- Manufacturer :
- Texas Instruments
- Product Category :
- Signal Switches, Multiplexers, Decoders
- Supply Voltage-Min (Vsup) :
- 4.5 V
- Terminal Form :
- NO LEAD
- Number of Pins :
- 20
- Propagation Delay (tpd) :
- 54 ns
- Package :
- Tube
- Seated Height-Max :
- 2.03 mm
- High Level Output Current :
- -4 mA
- Thickness :
- 1.83 mm
- Number of Terminals :
- 20
- Series :
- *
- Surface Mount :
- yes
- Lifecycle Status :
- Production (Last Updated: 1 week ago)
- Input Conditioning :
- Standard
- Min Supply Voltage :
- 4.5 V
- Quiescent Current :
- 80 µA
- Pin Count :
- 20
- Lead Free :
- Contains Lead
- Packing Method :
- Tube
- Peak Reflow Temperature (Cel) :
- NOT SPECIFIED
- Factory Lead Time :
- 1 Week
- Power Supplies :
- 5 V
- Terminal Position :
- QUAD
- Max Operating Temperature :
- 125 °C
- Max Supply Voltage :
- 5.5 V
- Packaging :
- Rail/Tube
- Logic Function :
- Decoder, Demultiplexer
- Number of Functions :
- 1
- Min Operating Temperature :
- -55 °C
- Subcategory :
- Decoder/Driver
- Operating Supply Voltage :
- 5 V
- Length :
- 8.89 mm
- Manufacturer :
- Texas
- Power Supply Current-Max (ICC) :
- 0.08 mA
- Max I(ol) :
- 0.004 A
- Polarity :
- Inverting
- Additional Feature :
- TWO ACTIVE-LOW AND ONE ACTIVE-HIGH ENABLE INPUTS
- Package Shape :
- Square
- Number of Outputs :
- 8
- Technology :
- CMOS
- Output Polarity :
- INVERTED
- Product Status :
- Active
- Reach Compliance Code :
- not_compliant
- JESD-30 Code :
- S-CQCC-N20
- Number of Bits :
- 8
- Number of Inputs :
- 3
- Propagation Delay :
- 54 ns
- Qualification Status :
- Qualified
- Temperature Grade :
- Military
- HTS Code :
- 8542.39.00.01
- Brand Name :
- Texas
- Low Level Output Current :
- 4 mA
- Number of Channels :
- 1
- Terminal Pitch :
- 1.27 mm
- Width :
- 8.89 mm
- Family :
- HCT
- Logic IC Type :
- OTHER DECODER/DRIVER
- Supply Voltage-Max (Vsup) :
- 5.5 V
- Number of Elements :
- 1
- Mount :
- Surface Mount
- Height :
- 0 m
- ECCN Code :
- EAR99
- RoHS :
- Compliant
- Screening Level :
- MIL-STD-883
- Manufacturer Lifecycle Status :
- ACTIVE (Last Updated: 1 week ago)
- Datasheets
- 85504012A

[Signal Switches, Multiplexers, Decoders] Overview
This is the overview of the SN54HCT138 3LINE TO 8LINE DECO, manufactured by Texas Instruments. The SN54HCT138 is a high-speed CMOS device designed to take three binary weighted address inputs (A0, A1, A2) and provide eight mutually exclusive outputs (Y0 to Y7). It utilizes silicon-gate CMOS technology to achieve operating speeds similar to LSTTL with the low power consumption of standard CMOS integrated circuits. This decoder features fully static operation, which enables the freedom to operate the clock at any frequency without external components.
SN54HCT138 Features
- High-speed CMOS technology
- Three binary weighted address inputs
- Eight mutually exclusive outputs
- Low power consumption
- Fully static operation
- Wide operating voltage range: 2V to 6V
- Buffered inputs
- TTL compatibility
- Minimal power consumption during standby
- Pin-compatible with LS TTL for easy integration
SN54HCT138 Applications
- Memory Address Decoding: The SN54HCT138 is commonly used in memory address decoding circuits in microprocessor-based systems. It interprets the binary address inputs and selects the appropriate memory location for read or write operations. Its high-speed operation and low power consumption make it ideal for efficient memory management in various electronic devices.
- Peripheral Device Selection: In computer systems and embedded applications, the SN54HCT138 facilitates the selection of peripheral devices such as input/output ports, registers, or control units. By decoding the address inputs, it enables the system to communicate with specific peripherals, enhancing overall functionality and efficiency.
- LED Display Multiplexing: LED display multiplexing circuits utilize the SN54HCT138 to control multiple LED segments or digits. By decoding the address inputs, the decoder determines which LED segment or digit to activate, allowing for dynamic and efficient display of alphanumeric characters, symbols, or graphics.
- Signal Routing and Control: This decoder is employed in signal routing and control applications where multiple input signals need to be selectively routed to different output channels. It finds use in communication systems, audio/video equipment, and industrial automation for efficient signal management and distribution.
- Automated Test Equipment (ATE): In ATE systems, the SN54HCT138 plays a vital role in signal routing and test pattern generation. It enables the selection of specific test points or signal paths, facilitating comprehensive testing and analysis of electronic components, printed circuit boards, and integrated circuits.
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