3- to 8-Line Decoder/Demultiplexer with Active-Low Outputs and Three Enables
X74_138 is an expandable decoder/demultiplexer with one active-High enable input (G1), two active-Low enable inputs (G2A and G2B), and eight active-Low outputs (Y7 – Y0). When G1 is High and G2A and G2B are Low, one of the eight active-Low outputs is selected with a 3-bit binary address on address inputs A, B, and C. The non-selected outputs are High. When G1 is Low or when G2A or G2B is High, all outputs are High. X74_138 can be used as an 8-output active-Low demultiplexer by tying the data input to one of the enable inputs.
Parameters
| Parameter | Description | Units | Default |
|---|---|---|---|
| DELAY | Propagation delay. | s | DGTDELAY |
| IN_MODE | Inputs mode. | IN | |
| OUT_MODE | Outputs mode. | OUT | |
| IOMODEL | The name of an I/O model, which describes the device’s loading and driving characteristics. | DGTDEFIOMODEL | |
| POWER_NODE | Digital power node name. Is the node used by the interface subcircuits which connect analog nodes to digital nodes. | $G_DPWR | |
| GROUND_NODE | Digital ground node name. Is the node used by the interface subcircuits which connect analog nodes to digital nodes. | $G_DGND |