MAX6732UTWID2-T Maxim Integrated, MAX6732UTWID2-T Datasheet - Page 9
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MAX6732UTWID2-T
Manufacturer Part Number
MAX6732UTWID2-T
Description
Supervisory Circuits
Manufacturer
Maxim Integrated
Series
MAX6730, MAX6731, MAX6732, MAX6733, MAX6734, MAX6735r
Datasheet
1.MAX3182EUKT.pdf
(15 pages)
Specifications of MAX6732UTWID2-T
Number Of Voltages Monitored
2
Monitored Voltage
0.9 V to 5 V
Undervoltage Threshold
1.62 V, 1.35 V
Overvoltage Threshold
1.71 V, 1.425 V
Output Type
Active Low, Open Drain
Manual Reset
Not Resettable
Watchdog
Watchdog
Battery Backup Switching
No Backup
Power-up Reset Delay (typ)
13.2 ms
Supply Voltage - Max
5.5 V
Maximum Operating Temperature
+ 85 C
Mounting Style
SMD/SMT
Package / Case
SOT-23
Chip Enable Signals
No
Maximum Power Dissipation
696 mW
Minimum Operating Temperature
- 40 C
Power Fail Detection
No
Supply Current (typ)
15 uA, 4 uA
Supply Voltage - Min
0.8 V
Many µP-based products require manual reset capabil-
ity, allowing the operator, a test technician, or external
logic circuitry to initiate a reset. A logic low on MR
asserts the reset output, clears the watchdog timer,
and deasserts the watchdog output. Reset remains
asserted while MR is low and for the reset timeout peri-
od (t
resistor allows MR to be left open if unused. Drive MR
with TTL or CMOS-logic levels or with open-drain/col-
lector outputs. Connect a normally open momentary
switch from MR to GND to create a manual reset func-
tion; external debounce circuitry is not required.
Connect a 0.1µF capacitor from MR to GND to provide
additional noise immunity when driving MR over long
cables or if the device is used in a noisy environment.
The MAX6734/MAX6735 provide an additional high-
impedance comparator input with a 626mV threshold to
monitor a third supply voltage. To monitor a voltage
higher than 626mV, connect a resistive-divider to the
circuit as shown in Figure 2 to establish an externally
controlled threshold voltage, V
Figure 1. RST, WDO, and MR Timing Diagram
RSTIN
RP
V
V
WDO
CC
RST
CC
MR
) after MR returns high. An internal 50kΩ pullup
1,
2
Circuits with Independent Watchdog Output
V
EXT_TH
Adjustable Input Voltage (RSTIN)
Single-/Dual-/Triple-Voltage µP Supervisory
(MIN)
V
CC
_______________________________________________________________________________________
= 626mV
V
TH
t
RP
EXT_TH
Manual Reset Input
×
(
R
1
R
+
.
2
R
2
)
t
Figure 2. Monitoring a Third Voltage
RP
R1
R2
V
EXT_TH
RSTIN
MAX6734
MAX6735
GND
9