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MAX706PEUA Datasheet(PDF) 8 Page - Maxim Integrated Products |
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MAX706PEUA Datasheet(HTML) 8 Page - Maxim Integrated Products |
8 / 15 page +3V Voltage Monitoring, Low-Cost µP Supervisory Circuits 8 _______________________________________________________________________________________ WDO can be connected to the nonmaskable interrupt (NMI) input of a µP. When VCC drops below the reset threshold, WDO immediately goes low, even if the watchdog timer has not timed out (Figure 3). Normally, this would trigger an NMI, but since reset is asserted simultaneously, the NMI is overridden. The WDO should not be connected to RESET directly. Instead, connect WDO to MR to generate a reset pulse when it times out. Manual Reset The manual reset (MR) input allows RESET and RESET to be activated by a pushbutton switch. The switch is effectively debounced by the 140ms minimum reset pulse width. MR can be driven by an external logic line since it is TTL/CMOS compatible. The minimum MR input pulse width is 500ns when VCC = +3V and 150ns when VCC = +5V. Leave MR unconnected or connect to VCC when not used. Power-Fail Comparator The power-fail comparator can be used for various pur- poses because its output and noninverting input are not internally connected. The inverting input is internally connected to a 1.25V reference. The power-fail com- parator has 10mV of hysteresis, which prevents repeat- ed triggering of the power-fail output (PFO). tRST tRST +3.3V 0V +3.3V +1V 0V RESET RESET WDO* +3.3V 0V MR* tMR *NOTE: MR EXTERNALLY DRIVEN LOW. WDO TIMING SHOWN FOR MAX706P/R/S/T. +3.3V 0V VCC VRST VRST tMD tWP tWD tWD tWD +3V/+3.3V 0V WDI +3V/+3.3V 0V WDO +3V/+3.3V 0V RESET tRST RESET EXTERNALLY TRIGGERED BY MR MAX706_ MAX708R/S/T RESET (RESET) 130kΩ 1% PARAMETER MIN TYP MAX UNIT +12V RESET THRESHOLD AT +25°C 10.24 10.87 11.50 V 1MΩ 1% +3V/+3.3V +12V VCC PFI ( ) ARE FOR MAX706P/AP GND MR PFO TO µP MAX706R/S/T MAX708R/S/T MAX706AR/AS/AT RESET R1 Figure 4. MAX706AP/AR/AS/AT Watchdog Timing Figure 3. RESET, RESET, MR, and WDO Timing Figure 5. Monitoring Both +3V/+3.3V and +12V Figure 6. RESET Valid to GND Circuit |
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