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CAT811TTBI-GT10 Datasheet(PDF) 6 Page - ON Semiconductor |
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CAT811TTBI-GT10 Datasheet(HTML) 6 Page - ON Semiconductor |
6 / 11 page CAT811, CAT812 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 140ms after the power supply voltage has risen above the threshold. 5V 0V 5V 0V 5V 0V CAT811 CAT812 Threshold Voltage 140ms minimum Reset Timeout Period Power Supply Voltage RESET RESET Figure 1. Reset Timing Diagram V TRANSIENT RESPONSE CC The CAT811/812 protect µPs against brownout failure. Short duration transients of 4µs or less and 100mV amplitude typically do not cause a false RESET. 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 0.5V above the threshold and drops below it by the amplitude of the overdrive voltage (V Figure 2 shows the maximum pulse duration of negative-going VCC transients that do not cause a reset condition. TH - V ). CC 30 25 20 15 10 5 0 RESET OVERDRIVE VTH - VCC (mV) 1 10 100 1000 TAMB = 25°C CAT8xxM CAT8xxZ Figure 2. Maximum Transient Duration without Causing a Reset Pulse vs. Reset Comparator Overdrive Doc. No. MD-3005 Rev. U 6 © 2010 SCILLC. All rights reserved. Characteristics subject to change without notice |
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