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