125nA Supervisory Circuits with Capacitor-

Adjustable Reset and Watchdog Timeouts

6

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Pin Description

PIN

MAX16056/

MAX16058

MAX16057/

MAX16059

NAME

FUNCTION

11

RESET

for the reset timeout period after all reset conditions are deasserted, and then goes high.

(MAX16056/MAX16058).

2

2

GND

Ground

3—

SWT

Watchdog Timeout Input. Connect a capacitor between SWT and GND to set the basic

5.15 x 10

use Table 2. Extend the basic watchdog timeout period by using the WDS input. Connect

SWT to ground to disable the watchdog timer function. The value of the capacitor must be

between 2275pF and 0.54µF to have a valid watchdog timeout period.

43

MR

Manual-Reset Input. Drive MR low to manually reset the device. RESET remains asserted

for the reset timeout period after MR is released. There is no internal pullup on MR. MR

54

5

Reset Timeout Input. Connect a capacitor from SRT to GND to select the reset timeout

4.7µF.

6

—

WDI

Watchdog Input. A falling transition must occur on WDI within the selected watchdog

timeout period or a reset pulse occurs. The watchdog timer clears when a falling transition

occurs on WDI or whenever RESET is asserted. Connect SWT to ground to disable the

watchdog timer function.

7

—

WDS

Watchdog Select Input. WDS selects the watchdog timeout mode. Connect WDS to

change in the state of WDS clears the watchdog timer.

86

—

5

N.C.

No Connection. Not internally connected.

—

—

EP

Exposed Pad. Connect EP to GND or leave unconnected.

Note 5: Floor: take the integral value.