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FM809JS3X Scheda tecnica(PDF) 4 Page - Fairchild Semiconductor |
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FM809JS3X Scheda tecnica(HTML) 4 Page - Fairchild Semiconductor |
4 / 9 page 4 www.fairchildsemi.com FM809/810 Rev. G Pin Descriptions * with overbar, FM809 (RESET); without, FM810 (RESET). Circuit Timing (e.g.: FM809) When operating properly with 5V in (for example), VOUT will also be about 5V. When VIN starts to fall, VOUT will follow it down as shown. When VIN drops below VTH, VOUT drops to ground ("issues a RESET") and stays there unless VIN also falls below its minimum operating voltage, approx. 1V. At this point, the supervisor loses control, and its output may rise, only to again follow VIN down to the ground. When VIN begins to rise, VOUT follows it until 1.0V or so is reached, whereupon the device regains control, VOUT is pulled to ground, etc. When VIN rises above VTH, VOUT comes out of RESET 140 ms later. If it is required that a lower value than GND + 1.0V is needed on RESET signal during VCC ≤ 1V, a 100K resistor may be used on the device output (to GND for the FM809, to VCC for the FM810). Pin Number Name Function 1 GND GROUND 2 RESET* RESET (RESET) remains LOW (HIGH) while VCC is below VTH, and for at least 140ms after VCC rises above VTH. 3VCC 5V VTH 1V GND 5V VTH 1V GND INPUT OUTPUT 140ms |
Codice articolo simile - FM809JS3X |
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