Dual/Triple, Ultra-Low-Voltage, SOT23 µP

Supervisory Circuits

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9

Pin Description (continued)

PIN

MAX6715A/

MAX6716A

MAX6717A/

MAX6718A

MAX6719A/

MAX6720A

MAX6721A/

MAX6722A

MAX6723A/

MAX6724A

MAX6725A/

MAX6726A

MAX6727A

MAX6728A/

MAX6729A/

MAX6797A

NAME

FUNCTION

—

—

——

—

—

—7

PFI

Power-Fail Voltage

Monitor Input. High-

impedance input for

internal power-fail monitor

comparator. Connect PFI

to an external resistor-

divider network to set the

power-fail threshold

voltage (0.626V typical

internal reference

voltage). Connect to GND,

—

—

——

—

—

—4

PFO

Active-Low Power-Fail

Monitor Output, Open-

Drain or Push-Pull. PFO is

asserted low when PFI is

less than 0.626V. PFO

deasserts without a reset

timeout period. Open-

drain outputs require an

external pullup resistor.

Push-pull outputs are

—

—

—

—

—

4

—

—

RST

Active-High Reset Output,

Open-Drain or Push-Pull.

RST changes from low to

drops below selected

reset thresholds, RSTIN is

below threshold, MR is

pulled low, or the

watchdog triggers a reset.

RST remains HIGH for the

reset timeout period after

the device reset

thresholds, MR goes low

to high, or the watchdog

triggers a reset. Open-

drain outputs require an

external pullup resistor.

Push-pull outputs are