74F138 1-of-8 Decoder/Demultiplexer IC (74138)
Accepts three binary weighted inputs and provides eight mutually exclusive outputs.
- Supply voltage: 4.5V - 5.5V
- High-level input voltage: 2.0V
- Low-level input voltage: 0.8V
- Input clamp current: -18mA
- High-level output current: -1mA
- Low-level output current: 20mA
- Operating free air temperature range: +70°C
Features:
- Demultiplexing capability
- Multiple input enable for easy expansion
- Ideal for memory chip select decoding
- Industrial temperature range available (–40°C to +85°C)
The 74F138 decoder accepts three binary weighted inputs (A0, A1, A2) and when enabled, provides eight mutually exclusive, active low outputs (Q0 – Q7). The device features three enable inputs; two active low (E0, E1) and one active high (E2). Every output will be high unless E0 and E1 are low and E2 is high. This multiple enable function allows easy parallel expansion of the device to 1–of–32 (5 lines to 32 lines) decoder with just four 74F138s and one inverter. The device can be used as an eight output demultiplexer by using one of the active low enable inputs as the data input and the remaining enable inputs as strobes. Enable inputs not used must be permanently tied to their appropriate active high or active low state.
* Images are for illustration only; actual product may vary.