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MAX814 Datasheet(PDF) 9 Page - Maxim Integrated Products |
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MAX814 Datasheet(HTML) 9 Page - Maxim Integrated Products |
9 / 16 page Reset Output A µP’s reset input starts the µP in a known state. Whenever the µP is in an unknown state, it should be held in reset. The MAX814/MAX815/MAX816 assert reset during power-up, power-down, or brownout conditions. On power-up, once VCC reaches 1V, RESET is a guar- anteed logic low of 0.4V or less. As VCC rises, RESET stays low. As VCC rises above the reset threshold, an internal timer releases RESET after 200ms. RESET also pulses low whenever VCC dips below the reset thresh- old (i.e., brownout condition). If brownout occurs in the middle of a previously initiated reset, the internal timer is reset and the output remains low for at least another 140ms after the brownout ends. On power-down, once VCC falls below the reset threshold, RESET stays low and is guaranteed to be less than 0.3V until VCC drops below 1V. The MAX814 and MAX816 also offer active-high RESET outputs. They are the inverse of the RESET outputs. ±1% Accuracy, Low-Power, +3V and +5V µP Supervisory Circuits _______________________________________________________________________________________ 9 MAX814 RESET GENERATOR RESET THRESHOLD POWER- FAIL THRESHOLD 60mV 1 150 µA 8 7 6 5 MR RESET RESET LOW LINE PFO VCC PFI 2 4 GND 3 MAX815 TIMEBASE RESET THRESHOLD POWER-FAIL THRESHOLD 150 µA 6 8 7 5 MR VCC WDO RESET PFO WDI PFI 2 1 4 GND 3 RESET GENERATOR WATCHDOG TIMER WATCHDOG TRANSITION DETECTOR MAX816 RESET GENERATOR 1.70V 1.70V 1 2 150 µA 8 7 5 MR VCC RESET RESET PFO RESET IN PFI 6 4 GND 3 Figure 4. MAX814 Block Diagram Figure 5. MAX815 Block Diagram Figure 6. MAX816 Block Diagram |
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