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CAT810 Datasheet(PDF) 6 Page - ON Semiconductor |
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CAT810 Datasheet(HTML) 6 Page - ON Semiconductor |
6 / 14 page CAT803, CAT809, CAT810 6 Doc. No. MD-3004, Rev. AA © 200 SCILLC. All rights reserved. Characteristics subject to change without notice 0V CAT803, CAT809 5V 0V 5V RESET/OUT RESET TD VTH VCC TR (140ms minimum) Reset Timeout Period CAT810 0V 5V DETAILED DESCRIPTIOnS RESET TIMInG The reset signal is asserted LOW for the CAT803/ CAT809 and HIGH for the CAT80 when the power supply voltage falls below the threshold trip voltage and remains asserted for at least 40ms after the power supply voltage has risen above the threshold. figure 2. Maximum Transient Duration Without Causing a Reset Pulse vs. Reset Comparator Overdrive VCC TRAnSIEnT RESPOnSE The CAT803/CAT809/CAT80 protect µPs against brownout failure. Short duration transients of 4µsec or less and 00mV amplitude typically do not cause a false RESET. Figure 2 shows the maximum pulse duration of negative- going VCC transients that do not cause a reset condition. figure 1. Reset Timing Diagram 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 (VTH - VCC). |
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