MAX6709 View Datasheet(PDF) - Maxim Integrated

Part Name

Description

Manufacturer

MAX6709

Low-Voltage, High-Accuracy, Quad Voltage Monitors in µMAX Package

Maxim Integrated 

Low-Voltage, High-Accuracy, Quad Voltage

Monitors in µMAX Package

MR

VCC

(5.0V/3.3V)

PFI1

(ADJ)

PFI2

(ADJ)

TIMEOUT

(200ms)

VCC

RESET

VCC

PFO1

VCC

PFO2

PFI3

(ADJ)

0.62V

REFERENCE

VCC

PFO3

VCC

UNDERVOLTAGE

LOCKOUT

MAX6714

Figure 2. MAX6714 Functional Diagram

as an adjustable voltage monitor, general-purpose

comparator, or digital-level translator.

The MAX6714 quad voltage monitor/reset offers one

fixed input with internal timing for µP reset, three power-

fail comparators, and a manual reset input (MR). RESET

asserts low when VCC drops below its threshold or MR is

driven low. Each of the three power-fail inputs connects

directly to one of the comparator inputs.

When any input is higher than the threshold level, the

output is high. The output goes low as the input drops

below the threshold voltage. The undervoltage lockout

circuitry remains active and all outputs remain low with

VCC down to 1V (Figures 1 and 2).

Applications Information

Hysteresis

When the voltage on one comparator input is at or near

the voltage on another input, ambient noise generally

causes the comparator output to oscillate. The most

common way to eliminate this problem is through hys-

teresis. When the two comparator input voltages are

equal, hysteresis causes one comparator input voltage

to move quickly past the other, thus taking the input out

of the region where oscillation occurs. Standard com-

parators require hysteresis to be added through the

use of external resistors. The external resistive network

usually provides a positive feedback to the input in

order to cause a jump in the threshold voltage when

output toggles in one direction or the other. These

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