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.
Figure 4. MAX6763/MAX6764 Functional Diagram
Figure 5. Setting the Threshold Voltage of VCC2
Functional Diagrams (continued)
INTERNAL
REFERENCE
0.5V
GND
OV MONITOR
UV MONITOR
OVTH
UVTH
UV
OV
UVIN
VCC
OVIN
MAX6763/MAX6764
OV
(UV)
UV
0.4255V +5%
+10%
+15%
VCC2
0.4255V -5%
-10%
-15%
MAX6760/MAX6761/MAX6762
(SUFFIXES LA, TA, RA, ZA, WA, AA)
V+
R1
R2
( ) MAX6761 ONLY.
MAX6754–MAX6764 Low-Power, Single/Dual-Voltage Window Detectors
www.maximintegrated.com Maxim Integrated
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