PIN

NAME

FUNCTION

MAX690A/MAX692A

MAX802L/MAX802M

MAX805L

1

1

2

2

+5V Supply Input

3

3

GND

Ground

4

4

PFI

Power-Fail Comparator Input. When PFI is less than 1.25V, PFO goes

5

5

PFO

Power-Fail Output. When PFI is less than 1.25V, PFO goes low;

otherwise PFO stays high.

6

6

WDI

Watchdog Input. If WDI remains high or low for 1.6sec, the internal

watchdog timer runs out and reset is triggered. If WDI is left floating

or connected to a high-impedance three-state buffer, the watchdog

feature is disabled. The internal watchdog timer clears whenever reset is

asserted, WDI is three-stated, or WDI sees a rising or falling edge.

7

7

RESET

Reset Output. Whenever RESET is triggered, it pulses low for 200ms.

MAX690A/MAX802L and 4.4V in the MAX692A/MAX802M) and remains

timeout also triggers RESET.

—

—

RESET

Active-High Reset Output is the inverse of RESET. When RESET is

higher.

8

8

MAX690A/MAX692A/

MAX802L/MAX802M/

MAX805L

Microprocessor Supervisory Circuits

www.maximintegrated.com

Maxim Integrated │ 5

Pin Description