Oscillator. An internal oscillator operates with a period of 1.67 seconds during no-smoke conditions. Every l.67 seconds, internal power is applied to the entire circuit and a check is made for smoke. Every 24 clock cycles (40 seconds), the LED is pulsed and a check is made for low battery by comparing VDD to an internal reference. Since very-low currents are used in the device, the oscillator capacitor at pin 12 should be a low-leakage type (PTFE, polystyrene, or polypropylene).
PAL16L8A4MJ-883B on stock| Parameter | Min | Typ. | Max | Unit |
| | Luminous (2856K) | 80 | 120 | | Vlm |
| Cathode Sensitivity | Radiant at 420nm | | 51 | | mA/W |
| Red/White Ratio (with R-68 filter) | | 0.2 | | |
| | Luminous (2856K) | 30 | 150 | | A/lm |
| Anode Sensitivity | Radiant at 420nm | | 6.1×104 | | N |
| Gain | | 1.2×106 | | |
| Anode Dark Counts | | 100 | 250 | cps |
| | Anode Pulse Rise Time | | 1.7 | | ns |
| Time Response | Electron Transit Time | | 24 | | ns |
| | | | | |
| 777_ | 50 ^^^ | 10 8 | 50 1 77TLl OOC ]1 |
| 1 000 pr_ _iClr_[ 'UT2~-20=5J [ =-[ | 2 7 3 6 4 5 | ] C3 Zo l-II- IN |
| | | |
