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CAT812RTBI-GT3 Datasheet(PDF) 6 Page - ON Semiconductor |
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CAT812RTBI-GT3 Datasheet(HTML) 6 Page - ON Semiconductor |
6 / 9 page CAT811, CAT812 http://onsemi.com 6 DETAILED DESCRIPTION Reset Timing The reset signal is asserted LOW for the CAT811 and HIGH for the CAT812 when the power supply voltage falls below the threshold trip voltage and remains asserted for at least 140 ms after the power supply voltage has risen above the threshold. 5 V 0 V 5 V 0 V Threshold Voltage 140 ms minimum Figure 6. Reset Timing Diagram RESET 0 V RESET CAT811 CAT812 Reset Timeout Period VCC VCC VCC Transient Response The CAT811/812 protect mPs against brownout failure. Short duration transients of 4 ms or less and 100 mV amplitude typically do not cause a false RESET. Figure 7 shows the maximum pulse duration of negative−going VCC transients that do not cause a reset condition. As the amplitude of the transient goes further below the threshold (increasing VTH − VCC), the maximum pulse duration decreases. In this test, the VCC starts from an initial voltage of 0.5 V above the threshold and drops below it by the amplitude of the overdrive voltage (VTH − VCC). Figure 7. Maximum Transient Duration without Causing a Reset Pulse vs. Reset Comparator Overdrive RESET OVERDRIVE VTH − VCC (mV) 1000 100 10 1 0 5 10 15 20 25 30 CAT8xxZ TAMB = 25°C CAT8xxM Valid Reset with VCC under 1.0 V To ensure that the CAT811 RESET pin is in a known state when VCC is under 1.0 V, a 100 kW pull−down resistor between RESET pin and GND is recommended; the value is not critical. For the CAT812, a pull−up resistor from RESET pin to VCC is needed. Figure 8. RESET Valid with VCC Under 1.0 V Figure 9. RESET Valid with VCC Under 1.1 V GND CAT812 RESET Power Supply GND 100 kW CAT811 Power Supply MR VCC 100 kW VCC RESET MR |
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