Detailed Description

The MAX6709/MAX6714 are low-power, quad voltage

monitors designed for multivoltage systems. Preset

voltage options for 5.0V, 3.3V, 3.0V, 2.5V, and 1.8V

make these quad monitors ideal for applications such

as telecommunications, desktop and notebook comput-

ers, high-end printers, data storage equipment, and

networking equipment.

The MAX6709/MAX6714 have an internally trimmed

threshold that minimizes or eliminates the need for

external components. The four open-drain outputs have

interface easily with other logic devices. The weak inter-

nal pullups can be overdriven by external pullups to any

voltage from 0 to 5.5V. Internal circuitry prevents current

puts can be wire-ORed for a single power-good signal.

The MAX6709 quad voltage monitor includes an accu-

rate reference, four precision comparators, and a

series of internally trimmed resistor-divider networks to

set the factory-fixed threshold options. The resistor net-

works scale the specified IN_ reset voltages to match

the internal reference/comparator voltage. Adjustable

threshold options bypass the internal resistor networks

and connect directly to one of the comparator inputs

(an external resistor-divider network is required for

threshold matching). The MAX6709 monitors power

supplies with either 5% or 10% tolerance specifica-

tions, depending on the selected version. Additional

high-input-impedance comparator options can be used

Low-Voltage, High-Accuracy Quad, Voltage

Monitors in µMAX Package

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7

UNDERVOLTAGE

LOCKOUT

0.62V

REFERENCE

PWRGD3

IN4

(ADJ)

IN3

(2.5V/1.8V)

IN2

(3.3V/3.0V)

IN1

(ADJ)

MAX6709

PWRGD4

PWRGD2

PWRGD1

Figure 1. MAX6709 Functional Diagram