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TC1278-10ENBTR Arkusz danych(PDF) 6 Page - Microchip Technology |
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TC1278-10ENBTR Arkusz danych(HTML) 6 Page - Microchip Technology |
6 / 12 page TC1278/TC1279 DS21384D-page 6 © 2007 Microchip Technology Inc. 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. Furthermore, it 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, [VCCTP - VCC] (mV) 5 3 2 4 1 0 1 5 100 1000 TA = +25°C VCCTP Duration Overdrive VCC TC1278/9 |
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