MAX6301ESA datasheet(5/12 Pages) MAXIM

5 / 12 page

+5V, Low-Power µP Supervisory Circuits

with Adjustable Reset/Watchdog

_______________________________________________________________________________________

______________________________________________________________Pin Description

NAME

FUNCTION

RESET IN

Reset Input. High-impedance input to the reset comparator. Connect this pin to the center point of an

external resistor voltage-divider network to set the reset threshold voltage. The reset threshold voltage

is calculated as follows: VRST = 1.22 x (R1 + R2) / R2 (see Typical Operating Circuit).

GND

Ground

SRT

Set Reset-Timeout Input. Connect a capacitor between this input and ground to select the reset timeout

period (tRS). Determine the period as follows: tRP = 2.67 x CSRT, with CSRT in pF and tRP in µs (see

Typical Operating Circuit).

SWT

Set Watchdog-Timeout Input. Connect a capacitor between this input and ground to select the basic

watchdog timeout period (tWD). Determine the period as follows: tWD = 2.67 x CSWT, with CSWT in pF

and tWD in µs. The watchdog function can be disabled by connecting this pin to ground.

RESET

(MAX6301/3)

Push/Pull, Active-Low Reset

Output (MAX6303)

RESET changes from high to low whenever the monitored voltage

(VIN) drops below the selected reset threshold (VRST). RESET

remains low as long as VIN is below VRST. Once VIN exceeds VRST,

RESET remains low for the reset timeout period and then goes high.

The watchdog timer triggers a reset pulse (tRP) whenever the watch-

dog timeout period (tWD) is exceeded.

WDI

Watchdog Input. A rising or falling transition must occur on this input within the selected watchdog

timeout period, or a reset pulse will occur. The capacitor value selected for SWT and the state of WDS

determine the watchdog timeout period. The watchdog timer clears and restarts when a transition

occurs on WDI or WDS. The watchdog timer is cleared when reset is asserted and restarted after reset

deasserts. In the extended watchdog mode (WDS = VCC), the watchdog function can be disabled by

driving WDI with a three-stated driver or by leaving WDI unconnected.

WDS

Watchdog-Select Input. This input selects the watchdog mode. Connect to ground to select normal mode

and the basic watchdog timeout period. Connect to VCC to select extended mode, multiplying the basic

timeout period by a factor of 500. A change in the state of this pin resets the watchdog timer to zero.

VCC

Supply Voltage

RESET

(MAX6302/4)

Push/Pull, Active-High Reset

Output (MAX6304)

Open-Drain, Active-High Reset

Output (MAX6302)

Open-Drain, Active-Low Reset

Output (MAX6301)

RESET changes from low to high whenever the monitored voltage

(VIN) drops below the selected reset threshold (VRST). RESET

remains high as long as VIN is below VRST. Once VIN exceeds VRST,

RESET remains high for the reset timeout period and then goes low.

The watchdog timer triggers a reset pulse (tRP) whenever the watch-

dog timeout period (tWD) is exceeded.

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