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MAX6730UTVD3-T Datasheet(PDF) 7 Page - Maxim Integrated Products |
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MAX6730UTVD3-T Datasheet(HTML) 7 Page - Maxim Integrated Products |
7 / 15 page Single-/Dual-/Triple-Voltage µP Supervisory Circuits with Independent Watchdog Output _______________________________________________________________________________________ 7 Pin Description PIN MAX6730 MAX6731 MAX6732 MAX6733 MAX6734 MAX6735 NAME FUNCTION 11 1 RST Active-Low Reset Output. The MAX6730/MAX6732/MAX6734 provide an open-drain output. The MAX6731/MAX6733/MAX6735 provide a push-pull output. RST asserts low when any of the following conditions occur: VCC1 or VCC2 drops below its preset threshold, RSTIN drops below its reset threshold, or MR is driven low. Open- drain versions require an external pullup resistor. 2 2 2 GND Ground 33 4 WDO Active-Low Watchdog Output. The MAX6730/MAX6732/MAX6734 provide an open- drain WDO output. The MAX6731/MAX6733/MAX6735 provide a push-pull WDO output. WDO asserts low when no low-to-high or high-to-low transition occurs on WDI within the watchdog timeout period (tWD) or if an undervoltage lockout condition exists for VCC1, VCC2, or RSTIN. WDO deasserts without a timeout period when VCC1, VCC2, and RSTIN exceed their reset thresholds, or when the manual reset input is asserted. Open-drain versions require an external pullup resistor. 4— 5 MR Active-Low Manual Reset Input. Drive MR low to force a reset. RST remains asserted as long as MR is low and for the reset timeout period after MR releases high. MR has a 50k Ω pullup resistor to VCC1; leave MR open or connect to VCC1 if unused. 5 5 3 WDI Watchdog Input. If WDI remains high or low for longer than the watchdog timeout period, the internal watchdog timer expires and the watchdog output asserts low. The internal watchdog timer clears whenever RST asserts or a rising or falling edge on WDI is detected. The watchdog has an initial watchdog timeout period (35s min) after each reset event and a short timeout period (1.12s min) after the first valid WDI transition. Leaving WDI unconnected does not disable the watchdog timer function. 66 8 VCC1 Primary Supply-Voltage Input. VCC1 provides power to the device when it is greater than VCC2. VCC1 is the input to the primary reset threshold monitor. —4 6 VCC2 Secondary Supply-Voltage Input. VCC2 provides power to the device when it is greater than VCC1. VCC2 is the input to the secondary reset threshold monitor. — — 7 RSTIN Undervoltage Reset Comparator Input. RSTIN provides a high-impedance comparator input for the adjustable reset monitor. RST asserts low if the voltage at RSTIN drops below the 626mV internal reference voltage. Connect a resistive voltage-divider to RSTIN to monitor voltages higher than 626mV. Connect RSTIN to VCC1 or VCC2 if unused. |
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