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MAX6756UKLD0

Low-Power, Single/Dual-Voltage Window Detectors

Maxim Integrated 

MAX6754–MAX6764

Low-Power, Single/Dual-Voltage Window Detectors

Functional Diagrams (continued)

MAX6763/MAX6764

UVIN

UV

UVTH

VCC

INTERNAL

REFERENCE

0.5V

OVTH

OVIN

UV MONITOR

GND

OV

OV MONITOR

Figure 4. MAX6763/MAX6764 Functional Diagram

Detailed Description

The MAX6754–MAX6764 are low-power window voltage

detectors capable of monitoring undervoltage and

overvoltage conditions on system power supplies.

Whenever a monitored voltage falls below its undervoltage

threshold or exceeds its overvoltage threshold, these

devices assert their outputs to notify the system (see

Functional Diagrams).

The MAX6754/MAX6755/MAX6756 are single-voltage

window detectors with internally fixed nominal voltage,

externally adjustable set window, single reset undervoltage/

overvoltage output, and a manual reset input.

The MAX6757/MAX6758/MAX6759 are single-voltage

window detectors with internally set nominal voltage,

externally adjustable set window, separate undervoltage/

overvoltage outputs, and manual reset input.

The MAX6760/MAX6761/MAX6762 are dual-voltage

window detectors with internally/externally set nominal

voltages, externally adjustable set window, separate

undervoltage/overvoltage outputs, manual reset input, and

overvoltage latch functions.

The MAX6763/MAX6764 are single adjustable window

detectors with separate undervoltage/overvoltage outputs.

The MAX6754–MAX6762 offer factory-fixed voltage

thresholds for monitoring system voltages from 0.9V to

5V. The MAX6754–MAX6762 include a SET function to

select the window voltage to ±5%, ±10%, or ±15%. The

MAX6763/MAX6764 allow for externally adjustable upper

and lower voltage thresholds to be set externally (down

to 0.5V). The MAX6754–MAX6762 are available with

two timing options (20μs propagation delay or 100ms

minimum reset timeout).

Supply Voltages

VCC is the power-supply input and the monitored volt-

age of the MAX6754–MAX6762. These devices feature

a factory-trimmed VCC and VCC2 divider that sets the

nominal input range (see Table 1 and Table 2). VCC for the

MAX6763/MAX6764 is the power supply of the device and

not the monitored voltage. For noisy systems, bypass VCC

and VCC2 each with a 0.1μF capacitor to GND. Connect

VCC of the MAX6756 to an RC filter to ensure proper

operation during extreme transition events. A 100Ω resis-

tor in series with a 0.1µF bypass capacitor is sufficient for

most applications. See Figure 9 for more details.

Setting the Adjustable Nominal Voltage

Threshold

The MAX6760/MAX6761/MAX6762 (versions with

suffixes LA, TA, RA, ZA, WA, and AA) offer adjustable

nominal voltage threshold to monitor VCC2. Use an

external voltage-divider to set the voltage at VCC2 to

0.4255V. Configure SET to select a monitor window of

±5%, ±10%, or ±15% (see Figure 5). The MAX6760/

MAX6761/MAX6762 suffix AA monitor only VCC2 and do

not monitor VCC.

0.4255V +5%

V+

+10%

+15%

OV

R1

VCC2

R2

(UV)

UV

0.4255V -5%

-10%

-15%

MAX6760/MAX6761/MAX6762

(SUFFIXES LA, TA, RA, ZA, WA, AA)

( ) MAX6761 ONLY.

Figure 5. Setting the Threshold Voltage of VCC2

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