74LS138 - 1-of-8 Decoder De-Multiplexer

74LS138 1-of-8 Line Decoder/Demultiplexer Integrated Circuit

The 74LS138 is a 1-of-8 line decoder and demultiplexer integrated circuit. It decodes one of eight output lines based on three binary select inputs. The IC incorporates three enable inputs for control and cascading. It operates at high speeds. The 74LS138 supports memory decoders and data transmission systems. Its Schottky-clamped design provides stable performance. This component is utilized in digital logic circuits.

Specifications:

• Function: 1-of-8 Line Decoder / Demultiplexer
• Logic Family: 74LS Series (Low-Power Schottky)
• Inputs: 3 Binary Select (A, B, C), 3 Enable (G1, G2A, G22B)
• Outputs: 8 (Y0-Y7)
• Operating Voltage: 4.75V to 5.25V (Typical 5V TTL)
• Output Type: Active-Low
• Technology: Schottky-Clamped Bipolar
• Package Type: DIP-16 (Dual In-line Package)
• Propagation Delay: Typically 21 ns (Data to Output)

Key features and benefits:

• 1-of-8 line decoder and demultiplexer function.
• Three binary select inputs (A, B, C).
• Three enable inputs (G1, G2A, G22B) for control and cascading.
• High-speed operation.
• Schottky-clamped bipolar technology.
• Minimizes external components for decoding schemes.
• Active-low outputs (Y0-Y7).

Applications:

• Memory decoding systems
• Advanced data transmission
• General digital logic circuits
• Address decoding
• Data routing and multiplexing
• Implementing complex decoding schemes (e.g., 24-line, 32-line)

Frequently Asked Questions:

Q: What is the typical operating voltage range for the 74LS138 IC?
A: The 74LS138 operates within a voltage range of 4.75V to 5.25V, typical for 5V TTL logic.

Q: Does the 74LS138 have active-high or active-low outputs?
A: The 74LS138 features active-low outputs (Y0-Y7).

Q: What package type is the 74LS138 supplied in?
A: The 74LS138 is supplied in a DIP-16 (Dual In-line Package).

Q: Can the 74LS138 be cascaded for larger decoding schemes?
A: Yes, the 74LS138 incorporates three enable inputs (G1, G2A, G22B) which facilitate cascading for expanded decoding.

Package Includes:

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