The MC74AC138/74ACT138 is a high-speed 1-of-8 decoder/demultiplexer. This device is ideally suited for high-speed bipolar memory chip select address decoding. The multiple input enables allow parallel expansion to a 1-of-24 decoder using just three MC74AC138/74ACT138 devices or a 1-of-32 decoder using four MC74AC138/74ACT138 devices and one inverter.
The MC74AC138/MC74ACT138 is a high-speed 1-of-8 decoder/demultiplexer designed by Motorola. It accepts three binary weighted inputs to provide eight mutually exclusive active-LOW outputs, making it ideal for high-speed bipolar memory chip select address decoding.
| Supply Voltage (VCC) | -0.5 to +7.0 V |
|---|---|
| Storage Temperature Range | -65 to +150 °C |
| Operating Ambient Temperature | -40 to 85 °C |
The maximum DC supply voltage referenced to ground is +7.0 V.
When enabled, the device provides eight mutually exclusive active-LOW outputs labeled O0 through O7.
The maximum quiescent supply current is 80 µA when all inputs are tied to VCC or GND.