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CAT812MTBI-T3 Datasheet(PDF) 6 Page - Catalyst Semiconductor |
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CAT812MTBI-T3 Datasheet(HTML) 6 Page - Catalyst Semiconductor |
6 / 11 page CAT811, CAT812 Doc. No. MD-3005 Rev. S 6 © Catalyst Semiconductor, Inc. Characteristics subject to change without notice 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. Figure 1. Reset Timing Diagram VCC TRANSIENT RESPONSE 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. Figure 2 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 0.5V above the threshold and drops below it by the amplitude of the overdrive voltage (VTH - VCC). Figure 2. Maximum Transient Duration without Causing a Reset Pulse vs. Reset Comparator Overdrive 30 25 20 15 10 5 0 RESET OVERDRIVE VTH - VCC (mV) 1 10 100 1000 TAMB = 25°C CAT8xxM CAT8xxZ 5V 0V 5V 0V 5V 0V CAT811 CAT812 Threshold Voltage 140ms minimum Reset Timeout Period Power Supply Voltage RESET RESET |
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Similar Description - CAT812MTBI-T3 |
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