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CAT859S Datasheet(PDF) 4 Page - Catalyst Semiconductor |
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CAT859S Datasheet(HTML) 4 Page - Catalyst Semiconductor |
4 / 9 page CAT853, CAT863, CAT859, CAT869 4 Doc. No. 3026, Rev. B © 2007 by Catalyst Semiconductor, Inc. Characteristics subject to change without notice 5V 0V 5V 0V Threshold Voltage 140ms minimum Reset Timeout Period Power Supply Voltage RESET DETAILED DESCRIPTIONS RESET TIMING The reset signal is asserted low for the CAT853, CAT863, CAT859, and CAT869 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 2. Maximum Transient Duration Without Causing a Reset Pulse vs. Reset Comparator Overdrive VCC TRANSIENT RESPONSE The CAT853, CAT863, CAT859, and CAT869 protect μPs against brownout failure. Short duration transients of 4μsec 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. 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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