2- to 4-Line Decoder/Demultiplexer with Active-Low Outputs and Active-Low Enable
X74_139 implements one half of a standard 74139 dual 2- to 4-line decoder/demultiplexer. When the active-Low enable input (G) is Low, one of the four active-Low outputs (Y3 – Y0) is selected with the 2-bit binary address on the A and B address input lines. B is the Highorder address bit. The non-selected outputs are High. Also, when G is High all outputs are High. X74_139 can be used as a 4-output active-Low demultiplexer by tying the data input to G.
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 |