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SN74LS138N DECODER DEMULTIPLEXER 1 OF 8 INVERTING 4.75 - 5.25 V
Description:
- Texas Instruments' high-speed 1-of-8 decoder/demultiplexer, the SN74LS138N, is made especially to choose one of eight outputs from a 3-bit binary input.
- These features and requirements make the SN74LS138N a useful and necessary component for applications that require effective decoding and data routing.
- The 1-of-8 Decoder/Demultiplexer converts three binary inputs to one of eight active-low outputs.
- Active Low Outputs: The outputs are inverted, so the selected line becomes low while the others remain high.
- Multiple Enable Inputs: Three enable inputs (two active low and one active high) provide flexible control and expansion.
- High-Speed Switching: The device employs Schottky diode technology for rapid switching.
- Low Power Consumption: The normal power dissipation is 32mW.
- TTL-Compatible Inputs and Outputs: Enables simple interaction with other TTL logic devices.
Electrical Specifications:
- Supply Voltage (VCC): 4.75V to 5.25V.
- High-Level Input Voltage (VIH): 2V minimum.
- Low-Level Input Voltage (VIL): 0.8V maximum.
- High-Level Output Voltage (VOH): 2.7V minimum at -400µA.
- Low-Level Output Voltage (VOL): 0.4V maximum at 8mA.
- High-Level Input Current (IIH): 20µA maximum.
- Low-Level Input Current (IIL): -0.4mA maximum.
- Quiescent Supply Current (ICC): 16mA maximum.
- Propagation Delay Time (tpd):
- 20ns typical from A, B, C inputs to output.
- Enable to output: 20ns.
- Power Dissipation (PD): 32mW.
- Operating Temperature Range: 0°C to 70°C.
- Storage Temperature Range: -65°C to +150°C.
Timing Specifications:
- Propagation Delay Time (High to Low Transition): 20ns.
- Propagation Delay Time (Low to High Transition): 20ns.
- Thermal Resistance, Junction to Ambient (θJA): 80°C/W.
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