| Circuitos Integrados | ||
|---|---|---|
| 74257 |
|---|
| Quad 2-input multiplexer; 3-state |
| PDF datasheet |
| S | 1 • | 16 | Vcc |
| 1I0 | 2 | 15 | OE |
| 1I1 | 3 | 14 | 4I0 |
| 1Y | 4 | 13 | 4I1 |
| 2I0 | 5 | 12 | 4Y |
| 2I1 | 6 | 11 | 3I0 |
| 2Y | 7 | 10 | 3I1 |
| GND | 8 | 9 | 3Y |
| Pin | Symbol | Description |
|---|---|---|
| 1 | S | common data select input |
| 2 | 1I0 | data input from source 0 |
| 3 | 1I1 | data input from source 1 |
| 4 | 1Y | multiplexer output |
| 5 | 2I0 | data input from source 0 |
| 6 | 2I1 | data input from source 1 |
| 7 | 2Y | multiplexer output |
| 8 | GND | ground |
| 9 | 3Y | multiplexer output |
| 10 | 3I1 | data input from source 1 |
| 11 | 3I0 | data input from source 0 |
| 12 | 4Y | multiplexer output |
| 13 | 4I1 | data input from source 1 |
| 14 | 4I0 | data input from source 0 |
| 15 | OE | enable input (active low; outputs in high-impedance off state when high) |
| 16 | Vcc | supply voltage |
| Specifications |
|---|
| (typical values under recommended operating conditions, unless specified) |
| Parameter | Value | Unit |
|---|---|---|
| Propagation delay, nI0 , nI1 to nY |
11 (74HC) 13 (74HCT) |
ns |
| Propagation delay, S to nY |
14 (74HC) 17 (74HCT) |
ns |
| Note |
|---|
| Data is maintained by an independent source and accuracy is not guaranteed. Check with the manufacturer's datasheet for up-to-date information. |
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