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MAX6332-T Datasheet(PDF) 6 Page - Maxim Integrated Products |
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MAX6332-T Datasheet(HTML) 6 Page - Maxim Integrated Products |
6 / 14 page MAX6316–MAX6322 5-Pin µP Supervisory Circuits with Watchdog and Manual Reset 6 Maxim Integrated _______________Detailed Description A microprocessor’s (µP) reset input starts or restarts the µP in a known state. The reset output of the MAX6316– MAX6322 µP supervisory circuits interfaces with the reset input of the µP, preventing code-execution errors during power-up, power-down, and brownout condi- tions (see the Typical Operating Circuit). The MAX6316/ MAX6317/MAX6318/MAX6320/MAX6321 are also capa- ble of asserting a reset should the µP become stuck in an infinite loop. Reset Output The MAX6316L/MAX6318LH/MAX6319LH feature an active-low reset output, while the MAX6317H/ MAX6318_H/MAX6319_H/MAX6321HP/MAX6322HP feature an active-high reset output. RESET is guaran- teed to be a logic low and RESET is guaranteed to be a logic high for VCC down to 1V. The MAX6316–MAX6322 assert reset when VCC is below the reset threshold (VRST), when MR is pulled low (MAX6316_/MAX6317H/MAX6319_H/MAX6320P/ MAX6322HP only), or if the WDI pin is not serviced within the watchdog timeout period (tWD). Reset remains assert- ed for the specified reset active timeout period (tRP) after VCC rises above the reset threshold, after MR transitions low to high, or after the watchdog timer asserts the reset (MAX6316_/MAX6317H/MAX6318_H/MAX6320P/ MAX6321HP). After the reset active timeout period (tRP) expires, the reset output deasserts, and the watchdog timer restarts from zero (Figure 2). MAX6316–MAX6322 VCC VCC WDI (ALL EXCEPT MAX6319/MAX6322) 1.23V 52k Ω 52k Ω GND RESET (ALL EXCEPT MAX6316/MAX6320P) RESET (ALL EXCEPT MAX6317) MR (ALL EXCEPT MAX6318/MAX6321) RESET GENERATOR WATCHDOG TIMER WATCHDOG TRANSITION DETECTOR Figure 1. Functional Diagram VCC 1V 1V tRD VRST VRST tRD RESET GND RESET tRP tRP GND Figure 2. Reset Timing Diagram |
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