MAX6363HUT29-T Maxim Integrated, MAX6363HUT29-T Datasheet - Page 7

• Manufacturer Part Number: MAX6363HUT29-T
• Description: Supervisory Circuits
• Manufacturer: Maxim Integrated
• Series: MAX6361, MAX6362, MAX6363, MAX6364r

Specifications of MAX6363HUT29-T

• Number Of Voltages Monitored: 1
• Monitored Voltage: 2.5 V, 3 V, 3.3 V, 5 V
• Undervoltage Threshold: 2.85 V
• Overvoltage Threshold: 3 V
• Output Type: Active High, Open Drain
• Manual Reset: Not Resettable
• Watchdog: No Watchdog
• Battery Backup Switching: Backup
• Power-up Reset Delay (typ): 280 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
• Supply Voltage - Min: 0 V

Operating Circuit, the MAX6362 monitors two supply
voltages. To monitor the secondary 5V logic or analog
supply with a 4.60V nominal programmed reset thresh-
old, choose R2 = 100kΩ, and calculate R1 = 273kΩ.
A µP’s reset input starts the µP in a known state. The
MAX6361–MAX6364 µP supervisory circuits assert a
reset to prevent code-execution errors during power-
up, power-down, and brownout conditions. RESET is
guaranteed to be a logic low or high depending on the
device chosen (see Ordering Information ). RESET or
RESET asserts when V
and for at least 150ms (t
reset threshold. RESET or RESET also asserts when MR
is low (MAX6361) and when RESET IN is less than
1.235V (MAX6364). The MAX6362 watchdog function
will cause RESET (or RESET) to assert in pulses follow-
ing a watchdog timeout (Figure 1).
The MAX6361–MAX6364 were designed for battery-
backed applications. If a backup battery is not used,
connect V
Figure 1. MAX6362 Watchdog Timeout Period and Reset Active Time
CC
SOT23, Low-Power µP Supervisory Circuits
to OUT and connect BATT to GND.
Applications Information
_______________________________________________________________________________________
Operation Without a Backup
CC
RP
RESET
is below the reset threshold
) after V
WDI
t
t
WD
RP
= RESET TIMEOUT PERIOD
= WATCHDOG TIMEOUT PERIOD
CC
Power Source
Reset Output
rises above the
t
WD
t
RP
If BATT is decoupled with a 0.1µF capacitor to ground,
the backup power source can be removed while V
remains valid without danger of triggering a reset pulse.
The device does not enter battery-backup mode when
V
These supervisors are relatively immune to short-dura-
tion, negative-going V
when V
not desirable.
The Typical Operating Characteristics section shows a
graph of Maximum Transient Duration vs. Reset
Threshold Overdrive for which reset is not asserted.
The graph was produced using negative-going V
pulses, starting at V
threshold by the magnitude indicated (reset threshold
overdrive). The graph shows the maximum pulse width
that a negative-going V
without triggering a reset pulse. As the amplitude of the
transient increases (i.e., goes further below the reset
threshold), the maximum allowable pulse width
decreases. Typically, a V
below the reset threshold and lasts for 30µs will not
trigger a reset pulse.
A 0.1µF bypass capacitor mounted close to the V
pin provides additional transient immunity.
CC
t
WD
stays above the reset threshold voltage.
with Battery Backup
CC
t
RP
experiences only small glitches is usually
Negative-Going V
Replacing the Backup Battery
CC
CC
CC
CC
and ending below the reset
transients. Resetting the µP
transient can typically have
transient that goes 100mV
CC
Transients
CC
CC
CC
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