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TC1278-5ENB Scheda tecnica(PDF) 4 Page - Microchip Technology |
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TC1278-5ENB Scheda tecnica(HTML) 4 Page - Microchip Technology |
4 / 12 page TC1278/TC1279 DS21384B-page 4 © 2002 Microchip Technology Inc. 3.0 APPLICATIONS INFORMATION 3.1 Operation – Power Monitor The TC1278/TC1279 provide the function of detecting out-of-tolerance power supply conditions and warning a processor-based system of impending power failure. When VCC is detected as out-of-tolerance, the RESET signal is asserted. On power-up, RESET is kept active for approximately 350msec after the power supply has reached the selected tolerance. This allows the power supply and microprocessor to stabilize before RESET is released. FIGURE 3-1: Timing Diagram – Power Up (TC1279) FIGURE 3-2: Timing Diagram – Power Down (TC1279) FIGURE 3-3: Timing Diagram – Power Up (TC1278) FIGURE 3-4: Timing Diagram – Power Down (TC1278) 4.75V 4.00V tR VCCTP VCC RESET tRPU1 VOH VCC RESET 4.75V VCCTP 4.00V VOL tRPD1 tF tR tRPU2 VOL VCCTP VCC RESET VCCTP(MAX) VCCTP(MIN) tF tRPD2 VCC 4.74V VOH RESET VCCTP 4.00V RESET SLEWS WITH VCC |
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