| Integrated Circuits |
|---|
| 74540 |
|---|
| Octal buffer/line driver; 3-state; inverting |
| PDF datasheet |
| OE 1 | 1 • | 20 | Vcc |
| A0 | 2 | 19 | OE 2 |
| A1 | 3 | 18 | Y 0 |
| A2 | 4 | 17 | Y 1 |
| A3 | 5 | 16 | Y 2 |
| A4 | 6 | 15 | Y 3 |
| A5 | 7 | 14 | Y 4 |
| A6 | 8 | 13 | Y 5 |
| A7 | 9 | 12 | Y 6 |
| GND | 10 | 11 | Y 7 |
| Pin | Symbol | Description |
|---|---|---|
| 1 | OE 1 | output enable (active low) |
| 2 | A0 | data input |
| 3 | A1 | data input |
| 4 | A2 | data input |
| 5 | A3 | data input |
| 6 | A4 | data input |
| 7 | A5 | data input |
| 8 | A6 | data input |
| 9 | A7 | data input |
| 10 | GND | ground |
| 11 | Y 7 | bus output |
| 12 | Y 6 | bus output |
| 13 | Y 5 | bus output |
| 14 | Y 4 | bus output |
| 15 | Y 3 | bus output |
| 16 | Y 2 | bus output |
| 17 | Y 1 | bus output |
| 18 | Y 0 | bus output |
| 19 | OE 2 | output enable (active low) |
| 20 | Vcc | supply voltage |
| Specifications |
|---|
| (typical values under recommended operating conditions, unless specified) |
| Parameter | Value | Unit |
|---|---|---|
| Propagation delay, An to Y n |
9 (74HC) 11 (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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