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CAT863CTBI-T3 Datasheet(PDF) 5 Page - ON Semiconductor |
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CAT863CTBI-T3 Datasheet(HTML) 5 Page - ON Semiconductor |
5 / 9 page CAT853, CAT859, CAT863, CAT869 http://onsemi.com 5 DETAILED DESCRIPTION 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 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 Reset Timeout Period Power Supply Voltage Figure 6. Reset Timing Diagram RESET VCC Transient Response The CAT853, CAT863, CAT859, and CAT869 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 “M” THRESHOLD “C” THRESHOLD TAMB = 25°C Valid Reset with VCC under 1.0 V To ensure that the CAT859 and CAT869 RESET pin is in a known state when VCC is under 1.0 V, a > 10 kW pull−down resistor between RESET pin and GND is recommended. CAT8x9 GND Power Supply Figure 8. RESET Valid with VCC Under 1.0 V 10 kW VCC RESET |
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Similar Description - CAT863CTBI-T3 |
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