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TC1278-15ENB Scheda tecnica(PDF) 5 Page - Microchip Technology |
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TC1278-15ENB Scheda tecnica(HTML) 5 Page - Microchip Technology |
5 / 12 page © 2002 Microchip Technology Inc. DS21384B-page 5 TC1278/TC1279 3.2 VCC Transient Rejection The TC1278/TC1279 provides accurate VCC monitor- ing and reset timing during power-up, power-down, and brownout/sag conditions, and rejects negative- going transients (glitches) on the power supply line. Figure 3-5 shows the maximum transient duration vs. maximum negative excursion (overdrive) for glitch rejection. Any combination of duration and overdrive that lays under the curve will not generate a reset signal. Combinations above the curve are detected as a brownout or power-down. Transient immunity can be improved by adding a capacitor in close proximity to the VCC pin of the TC1278/TC1279. FIGURE 3-5: MAXIMUM TRANSIENT DURATION VS. OVERDRIVE FOR GLITCH REJECTION AT 25°C RESET COMPARATOR OVERDRIVE, [V CCTP - VCC] (mV) 5 3 2 4 1 0 1 5 100 1000 TA °C VCCTP Duration Overdrive VCC TC1278/9 |
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