MAX690ACSLASHD datasheet(5/13 Pages) MAXIM

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NAME

FUNCTION

MAX690A/MAX692A

MAX802L/MAX802M

MAX805L

VOUT

Supply Output for CMOS RAM. When VCC is above the reset threshold,

VOUT connects to VCC through a P-channel MOSFET switch. When

VCC is below the reset threshold, the higher of VCC or VBATT will be

connected to VOUT.

VCC

+5V Supply Input

GND

Ground

PFI

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

low. Connect PFI to GND or VCC when not used.

PFO

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

otherwise PFO stays high.

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.

RESET

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

It stays low when VCC is below the reset threshold (4.65V in the

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

low for 200ms after VCC rises above the reset threshold. A watchdog

timeout also triggers RESET.

—

RESET

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

asserted, the RESET output voltage = VCC or VBATT, whichever is

higher.

VBATT

Backup-Battery Input. When VCC falls below the reset threshold, VBATT

will be switched to VOUT if VBATT is 20mV greater than VCC. When VCC

rises to 20mV above VBATT, VOUT will be reconnected to VCC. The

40mV hysteresis prevents repeated switching if VCC falls slowly.

MAX690A/MAX692A/

MAX802L/MAX802M/

MAX805L

Microprocessor Supervisory Circuits

www.maximintegrated.com

Maxim Integrated │ 5

Pin Description

MAX690AC/D Datasheet(PDF) 5 Page - Maxim Integrated Products

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