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MAX6747KA16 Datasheet(PDF) 6 Page - Maxim Integrated Products |
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MAX6747KA16 Datasheet(HTML) 6 Page - Maxim Integrated Products |
6 / 14 page µP Reset Circuits with Capacitor-Adjustable Reset/Watchdog Timeout Delay 6 _______________________________________________________________________________________ Pin Description (continued) PIN MAX6746 MAX6747 MAX6748– MAX6751 MAX6752 MAX6753 NAME FUNCTION 5 5 — WDS Watchdog Select Input. WDS selects the watchdog mode. Connect WDS to ground to select normal mode and the watchdog timeout period. Connect WDS to VCC to select extended mode, multiplying the basic timeout period by a factor of 128. A change in the state of WDS clears the watchdog timer. — — 5 SET1 Logic Input. SET1 selects the watchdog window ratio or disables the watchdog timer. See Table 1. 6 6 6 WDI Watchdog Input. MAX6746–MAX6751: A falling transition must occur on WDI within the selected watchdog timeout period or a reset pulse occurs. The watchdog timer clears when a transition occurs on WDI or whenever RESET is asserted. Connect SWT to ground to disable the watchdog timer function. MAX6752/MAX6753: WDI falling transitions within periods shorter than tWD1 or longer than tWD2 force RESET to assert low for the reset timeout period. The watchdog timer begins to count after RESET is deasserted. The watchdog timer clears when a valid transition occurs on WDI or whenever RESET is asserted. Connect SET0 high and SET1 low to disable the watchdog timer function. See the Watchdog Timer section. 77 7 RESET Push/Pull or Open-Drain Reset Output. RESET asserts whenever VCC or RESET IN drops below the selected reset threshold voltage (VTH or VRESET IN, respectively) or manual reset is pulled low. RESET remains low for the reset timeout period after all reset conditions are deasserted, and then goes high. The watchdog timer triggers a reset pulse (tRP) whenever a watchdog fault occurs. 88 8 VCC Supply Voltage. VCC is the power-supply input and the input for fixed threshold VCC monitor. |
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