MAX6764UT Datasheet, PDF (13/20 Pages) Maxim Integrated Products – Low-Power, Single/Dual-Voltage Window Detectors

Low-Power, Single/Dual-Voltage Window
Detectors
Functional Diagrams (continued)
MAX6763/MAX6764
UVIN
UV_TH
V_CC
INTERNAL
REFERENCE
0.5V
OV_TH
OVIN
UV
UV MONITOR
GND
OV
OV MONITOR
Figure 4. MAX6763/MAX6764 Functional Diagram
Detailed Description
The MAX6754–MAX6764 are low-power window volt-
age detectors capable of monitoring undervoltage and
overvoltage conditions on system power supplies.
Whenever a monitored voltage falls below its undervolt-
age threshold or exceeds its overvoltage threshold,
these devices assert their outputs to notify the system
(see the Functional Diagrams).
The MAX6754/MAX6755/MAX6756 are single-voltage
window detectors with internally fixed nominal voltage,
externally adjustable set window, single reset
under/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 under/over-
voltage 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
under/overvoltage outputs, manual reset input, and
overvoltage latch functions.
The MAX6763/MAX6764 are single adjustable window
detectors with separate under/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
V_CC is the power-supply input and the monitored voltage
of the MAX6754–MAX6762. These devices feature a fac-
tory-trimmed V_CC and V_CC2 divider that sets the nominal
input range (see Tables 1 and 2). V_CC for the MAX6763/
MAX6764 is the power supply of the device and not the
monitored voltage. For noisy systems, bypass V_CC and
V_CC2 each with a 0.1µF capacitor to GND.
Setting the Adjustable Nominal Voltage
Threshold
The MAX6760/MAX6761/MAX6762 (versions with suffix-
es LA, TA, RA, ZA, WA, and AA) offer adjustable nominal
voltage threshold to monitor V_CC2. Use an external volt-
age-divider to set the voltage at V_CC2 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 V_CC2 and do not moni-
tor V_CC.
0.4255V +5%
V+
+10%
+15%
OV
R1
V_CC2
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 V_CC2
______________________________________________________________________________________ 13