| Pin | Name | Description |
|---|
| 1 | ground | 0 V supply |
| 2 | trigger | When the pin voltage falls below 0.33 Vcc, the timer is triggered and the output goes high. In the monostable configuration a high to low transition on the trigger pin starts the timer. |
| 3 | output | The output pulses during astable operation and goes high for a set time in monostable operation. |
| 4 | reset | If reset is not used, connect it to Vcc. If reset falls, a high output will be forced low. |
| 5 | control voltage | For reliable operation add a 10 nF capacitor to ground on this pin. |
| 6 | threshold | Detects when the voltage on the timing capacitor rises above 0.66 Vcc and resets the output when this happens. |
| 7 | discharge | Provides a discharge path from the timing capacitor to ground when the output is low. |
| 8 | Vcc | Positive power supply voltage. |
