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TC1276-15ENB Datenblatt(PDF) 4 Page - Microchip Technology |
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TC1276-15ENB Datenblatt(HTML) 4 Page - Microchip Technology |
4 / 12 page TC1275/TC1276/TC1277 DS21383C-page 4 © 2007 Microchip Technology Inc. 3.0 APPLICATIONS INFORMATION 3.1 Operation – Power Monitor The TC1275/TC1276/TC1277 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 200 ms 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 (TC1275/TC1276). FIGURE 3-2: Timing Diagram – Power Down (TC1275/TC1276). FIGURE 3-3: Timing Diagram – Power Up (TC1277). FIGURE 3-4: Timing Diagram – Power Down (TC1277). VCCTP(MAX) VCCTP(MIN) tR VCCTP VCC RESET tRPU1 VOH VCC RESET VCCTP(MAX) VCCTP VCCTP(MIN) VOL tRPD1 tF tR tRPU2 VOL VCCTP VCC RESET VCCTP(MAX) VCCTP(MIN) tF tRPD2 VCC VCCTP(MAX) VOH RESET VCCTP VCCTP(MIN) RESET SLEWS WITH VCC |
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