MAX6746 View Datasheet(PDF) - Maxim Integrated
Part Name
Description
Manufacturer
MAX6746 Datasheet PDF : 14 Pages
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µP Reset Circuits with Capacitor-Adjustable
Reset/Watchdog Timeout Delay
MAX6746
MAX6747
PIN
MAX6748–
MAX6751
MAX6752
MAX6753
5
5
—
—
—
5
6
6
6
7
7
7
8
8
8
Pin Description (continued)
NAME
FUNCTION
WDS
SET1
WDI
RESET
VCC
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.
Logic Input. SET1 selects the watchdog window ratio or disables the
watchdog timer. See Table 1.
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.
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.
Supply Voltage. VCC is the power-supply input and the input for fixed
threshold VCC monitor.
6 _______________________________________________________________________________________
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