MAX6764 Maxim Integrated Products, MAX6764 Datasheet - Page 14

• Manufacturer Part Number: MAX6764
• Description: (MAX6754 - MAX6764) Single/dual-voltage Window Detectors
• Manufacturer: Maxim Integrated Products

Choose R2 to have a resistance of up to 500kΩ.
Calculate R1 by:
The MAX6763/MAX6764 provide inputs to a window
detector allowing the programming of the threshold
voltage to within V
Choose R1, R2, and R3 such that:
The MAX6754–MAX6762 allow the setting of the window
voltage range of the voltage detector. Connect SET to
GND to set a ±5% window. Connect SET to V
±10% window. Bias SET to V
The MAX6754–MAX6762 include an active-low manual
reset input. Drive MR low to assert a reset output
(MAX6754/MAX6755/MAX6756) or an undervoltage
output (MAX6757/MAX6758/MAX6759). The output
remains asserted for the specified propagation delay
time (see
pulled to V
Low-Power, Single/Dual-Voltage Window
Detectors
Figure 6. Setting the Under/Overvoltage Window
14
______________________________________________________________________________________
R1
R2
R3
V+
R1 = ((V
Figure
UVIN
OVIN
CC
V
CC
(V+ / (R1 + R2 + R3)) ≥ 1µA
UNDERVOLTAGE ASSERTS WHEN
with a 26kΩ resistor.
OVERVOLTAGE ASSERTS WHEN
MAX6763/MAX6764
7) after MR goes high. MR is internally
REFERENCE
INTERNAL
+
CC
0.5V
- 0.4255V) x R2) / 0.4255V
(see
UV
OV
Figure
TH
TH
CC
/2 for a ±15% window.
Manual Reset (
6).
R1 + R2 + R3
V+ x (R2 + R3)
R1 + R2 + R3
V+ x R3
UV MONITOR
OV MONITOR
> 0.5V
< 0.5V
UV
GND
OV
CC
SET
MR )
for a
The MAX6760/MAX6761/MAX6762 provide an overvolt-
age latch control input (OVLATCH). Drive OVLATCH
high to latch the overvoltage output for any V
V
clear the latch after overvoltage conditions have been
removed. The latch is transparent when OVLATCH is
connected to GND. OVLATCH is a high impedance
input. Use external pullup or pulldown.
RESET, RESET, UV, UV, and OV outputs assert when
the monitored supply is below the selected UV
threshold or above the selected OV
reset output deasserts after the specified timeout peri-
od when the monitored supply rises above the UV
threshold or drops below the OV
push-pull versions are referenced to V
The MAX6760/MAX6761/MAX6762 monitor both V
and V
voltage supply asserts the corresponding output.
RESET and UV are guaranteed to be in the correct
logic state when V
Figure 7a. Manual Reset/
Figure 7b. V
CC2
RESET, UV
(RESET IS THE COMPLEMENT OF RESET)
V
CC
overvoltage condition. Drive OVLATCH low to
Reset, Undervoltage, and Overvoltage
CC2
RESET, UV
Outputs (RESET, RESET , UV , UV, OV)
MR
. An under/overvoltage condition on either
CC
/RESET, UV Timing Diagram
t
Overvoltage Latch Control Input
D-UV
CC
t
D-MR
or V
Reset Timing Diagram
CC2
> 1V.
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t
RP
TH
t
MR_P
TH
CC
threshold. The
threshold. The
.
(OVLATCH)
CC
CC
TH
TH
or