| Integrated Circuits |
|---|
| 74640 |
|---|
| Octal bus transceiver; 3-state; inverting |
| PDF datasheet |
| DIR | 1 • | 20 | Vcc |
| A0 | 2 | 19 | OE |
| A1 | 3 | 18 | B0 |
| A2 | 4 | 17 | B1 |
| A3 | 5 | 16 | B2 |
| A4 | 6 | 15 | B3 |
| A5 | 7 | 14 | B4 |
| A6 | 8 | 13 | B5 |
| A7 | 9 | 12 | B6 |
| GND | 10 | 11 | B7 |
| Pin | Symbol | Description |
|---|---|---|
| 1 | DIR | direction control |
| 2 | A0 | data input/output |
| 3 | A1 | data input/output |
| 4 | A2 | data input/output |
| 5 | A3 | data input/output |
| 6 | A4 | data input/output |
| 7 | A5 | data input/output |
| 8 | A6 | data input/output |
| 9 | A7 | data input/output |
| 10 | GND | ground |
| 11 | B7 | data input/output |
| 12 | B6 | data input/output |
| 13 | B5 | data input/output |
| 14 | B4 | data input/output |
| 15 | B3 | data input/output |
| 16 | B2 | data input/output |
| 17 | B1 | data input/output |
| 18 | B0 | data input/output |
| 19 | OE | output enable (active low) |
| 20 | Vcc | supply voltage |
| Specifications |
|---|
| (typical values under recommended operating conditions, unless specified) |
| Parameter | Value | Unit |
|---|---|---|
| Propagation delay, An to Bn | 11 (74HC/HCT) | ns |
| Propagation delay, Bn to An |
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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