SN74LS138N(74LS138) Logic chip

The SN74LS138N is a 3-to-8 line decoder/demultiplexer from the 74LS series of TTL logic ICs. It takes a 3-bit binary input and decodes it into one of eight outputs. Each output corresponds to one of the possible combinations of the three input bits, making it a useful component for addressing memory, selecting data sources, and implementing various digital logic functions. The SN74LS138N features active-low outputs and three enable inputs, allowing for greater flexibility in digital circuit design.

Key Features:

• 3-to-8 line decoder/demultiplexer
• Active-low outputs
• Three enable inputs for cascading or enabling/disabling the device
• High noise immunity
• Fast switching speeds
• Standard 16-pin DIP package
• TTL-compatible inputs and outputs

Technical Specifications:

• Supply Voltage (VCC): 4.75V to 5.25V
• High-Level Input Voltage (VIH): 2V (min)
• Low-Level Input Voltage (VIL): 0.8V (max)
• High-Level Output Voltage (VOH): 2.7V (min) at IOH = -0.4 mA
• Low-Level Output Voltage (VOL): 0.5V (max) at IOL = 8 mA
• Input Current (II): 0.1 mA (max)
• Propagation Delay Time (tpd): 21 ns (typical)
• Operating Temperature Range: 0°C to +70°C
• Package: 16-pin DIP

Applications:

• Memory Addressing: Used for memory chip selection and address decoding in computer systems.
• Data Selection: Selects data sources in multiplexing applications.
• Digital Circuit Design: Implements various logic functions in digital circuits.
• Control Systems: Acts as a control signal distributor in automated systems.
• Microprocessor Systems: Decodes addresses and controls peripheral devices.

Datasheet:
For detailed technical information, refer to the SN74LS138N Datasheet.