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MAX6807XR46-T Datasheet(PDF) 5 Page - Maxim Integrated Products |
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MAX6807XR46-T Datasheet(HTML) 5 Page - Maxim Integrated Products |
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5 / 9 page  Applications Information Negative-Going VCC Transients In addition to asserting a reset signal during power-up, power-down, and brown-out conditions, the MAX6806/ MAX6807/MAX6808 are immune to short-duration, neg- ative-going VCC transients. Figure 3 displays typical transient durations vs. reset-com- parator overdrive for which the MAX6806/MAX6807/ MAX6808 do not generate a reset pulse. The graph was generated using a negative-going pulse applied to VCC, starting 0.5V above the actual reset threshold and ending below it by the magnitude indicated (reset-comparator overdrive). The graph indicates the maximum pulse width a negative-going VCC transient can have without causing a reset pulse. As the magnitude of the transient increases (goes further below the reset threshold), the maximum allowable pulse width decreases. A 0.1µF capacitor mounted as close as possible to VCC provides additional transient immunity. Ensuring a Valid Reset Output Down to VCC = Ground When VCC falls below 1V, the MAX6806/MAX6808 RESET output no longer sinks current—it becomes an open circuit. Therefore, high-impedance CMOS logic inputs connected to RESET can drift to undetermined voltages. This presents no problem in most applications, since most circuitry is inoperative when VCC is below 1V. In applications where RESET must be valid down to ground, add a pulldown resistor to RESET so any stray leakage currents flow to ground, holding RESET low (Figure 4). Select R1 to be large enough not to load RESET and small enough to pull RESET to ground. For most applications, 100kW will not load RESET and will pull RESET to ground. Similarly, if RESET (MAX6807) must be valid below 1.2V, add a pullup resistor to RESET. Figure 4. RESET / RESET Valid to VCC = Ground Circuit Figure 3. Maximum Transient Duration without Causing a Reset Pulse vs. Reset Comparator Overdrive MAX6806 MAX6807 VCC VCC GND GND RESET RESET R1 100kΩ R1 100kΩ 80 70 20 10 100 1000 40 30 50 60 RESET COMPARATOR OVERDRIVE, VTH- - VCC (mV) TA = +25°C MAX680 46 www.maximintegrated.com Maxim Integrated │ 5 MAX6806/MAX6807/ MAX6808 Voltage Detectors |
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