7490
4-bit decade counter
PDF datasheet
| | | | |
| CKB | 1 • | 14 | CKA |
| R0(1) | 2 | 13 | NC |
| R0(2) | 3 | 12 | QA |
| NC | 4 | 11 | QD |
| Vcc | 5 | 10 | GND |
| R9(1) | 6 | 9 | QB |
| R9(2) | 7 | 8 | QC |
| | | | |
| Pin | Symbol | Description |
|---|
| 1 | CKB | clock input |
| 2 | R0(1) | reset to 0 |
| 3 | R0(2) | reset to 0 |
| 4 | NC | no connection |
| 5 | Vcc | supply voltage |
| 6 | R9(1) | reset to 9 |
| 7 | R9(2) | reset to 9 |
| 8 | QC | counter output |
| 9 | QB | counter output |
| 10 | GND | ground |
| 11 | QD | counter output |
| 12 | QA | counter output |
| 13 | NC | no connection |
| 14 | CKA | clock input |
Notes
- For maximum count length, connect CKB to QA and apply input pulses to CKA.
Note: Data is maintained by an independent source and accuracy is not guaranteed. Check with the manufacturer's datasheet for up-to-date information.