MAX6734KAZWD3-T Maxim Integrated, MAX6734KAZWD3-T Datasheet - Page 9

• Manufacturer Part Number: MAX6734KAZWD3-T
• Description: Supervisory Circuits
• Manufacturer: Maxim Integrated
• Series: MAX6730, MAX6731, MAX6732, MAX6733, MAX6734, MAX6735r

Specifications of MAX6734KAZWD3-T

• Number Of Voltages Monitored: 3
• Monitored Voltage: 0.9 V to 5 V
• Undervoltage Threshold: 2.25 V, 1.62 V, Adjustable
• Overvoltage Threshold: 2.375 V, 1.71 V, Adjustable
• Output Type: Active Low, Open Drain
• Manual Reset: Resettable
• Watchdog: Watchdog
• Battery Backup Switching: No Backup
• Power-up Reset Delay (typ): 210 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: 714 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