Detailed Description

Supply Voltages

The MAX6715–MAX6729 microprocessor (µP) supervi-

sory circuits maintain system integrity by alerting the µP

to fault conditions. These ICs are optimized for systems

that monitor two or three supply voltages. The output-

reset state is guaranteed to remain valid while either

Threshold Levels

Input voltage threshold level combinations are indicat-

ed by a two-letter code in the Reset Voltage Threshold

Suffix Guide (Table 1). Contact factory for availability of

other voltage threshold combinations.

Reset Outputs

The MAX6715–MAX6729 provides an active-low reset

output (RST) and the MAX6725/MAX6726 provides

both an active-high (RST) and an active-low reset out-

put (RST). RST, RST, RST1, and RST2 are asserted

voltage threshold level, RSTIN drops below threshold,

or MR is pulled low. Once reset is asserted it stays low

the reset timeout period is completed, the internal timer

Dual/Triple Ultra-Low-Voltage SOT23 µP

Supervisory Circuits

_______________________________________________________________________________________

9

Pin Description (continued)

PIN

MAX6715/

MAX6716

MAX6717/

MAX6718

MAX6719/

MAX6720

MAX6721/

MAX6722

MAX6723/

MAX6724

MAX6725/

MAX6726

MAX6727

MAX6728/

MAX6729

NAME

FUNCTION

——

———

——

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 high when

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

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 referenced to