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TC1232EOE713 Datenblatt(PDF) 7 Page - Microchip Technology |
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TC1232EOE713 Datenblatt(HTML) 7 Page - Microchip Technology |
7 / 20 page 2002-2012 Microchip Technology Inc. Preliminary DS21370D-page 7 TC1232 4.0 OPERATIONAL DESCRIPTION 4.1 Power Monitor The TC1232 provides the function of warning the processor of a power failure. When VCC is detected as being below the voltage levels defined by the TOL pin, the TC1232’s comparator outputs the RST and RST signals to a logic level that warns the system of an out- of-tolerance power supply. The RST and RST signals switch at a threshold value of 4.5V if TOL is tied to VCC, and at a value of 4.75 volts if TOL is grounded. The RST and RST signals are held active for a minimum of 250 ms to ensure that the power supply voltage has been stabilized. Figure 4-1 shows the VCC fall time. Figure 4-2 shows the VCC rise time. Figure 4-3 shows the time from when the voltage trip point is detected to the reset output pin going active. Figure 4-4 shows the time from when the voltage trip point is exited to the reset output pin going inactive. FIGURE 4-1: Power-Down Slew Rate. FIGURE 4-2: Power-up Slew Rate. FIGURE 4-3: VCC Detect Reset Output Delay (Power-Down). FIGURE 4-4: VCC Detect Reset Output Delay (Power-Up). +4.75V tF VCC +4.25V tR VCC +4.25V +4.75V VCC = 5V +4.5V (5% Trip Point) +4.25V (10% Trip Point) RST RST VOL VOH tRPD VCC SLEW RATE = 1.66 mV/µs (0.5V/300 µs) VCC 4.6V (5% Trip Point) 4.5V(10% Trip Point) RST RST VOL VOH tRPU |
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