MAX701CSLASHD datasheet(4/6 Pages) MAXIM

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Power-Supply Monitor with Reset

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Pin Description

MAX700

MAX701

MAX702

NAME

FUNCTION

111

Input for Manual Pushbutton Reset. Has internal 5µA pullup. Low input activates the

RESET/RESET outputs.

—

SENSE

The voltage-sense input when CTL = VCC. Its threshold is 1.29V. SENSE always

remains connected to the internal comparator. So, when VCC is being monitored

internally (CTL = GND), SENSE should be left open circuit.

—

HYST

Normally NOT used when voltage is monitored through VCC (CTL = GND). When

monitoring through SENSE (CTL = VCC), HYST allows hysteresis to be added,

reducing noise and spurious reset activity (Figure 3). HYST turns on 5µs before the

RESET/RESET outputs are activated, and its on-resistance to GND is typically 1k

Ω.

GND

Ground

567

RESET

Goes low when VCC falls below 4.65V, or when CTL = VCC on the MAX700 goes low

when SENSE falls below 1.29V.

—

RESET

Inverted Version of RESET

—

CTL

When CTL = GND, VCC is monitored by the reset circuit. When CTL = VCC, VCC is ignored

and SENSE is monitored, allowing the threshold to be set with external resistors.

882

VCC

Chip Power and +5V Sensing Input (When CTL = GND on MAX700)

—

2, 3, 7

4, 5, 6, 8

N.C.

No Connection

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