MAX811TEUS+T Maxim Integrated Products, MAX811TEUS+T Datasheet - Page 5

• Manufacturer Part Number: MAX811TEUS+T
• Description: IC MPU V-MONITOR 3.08V SOT143-4
• Manufacturer: Maxim Integrated Products
• Type: Simple Reset/Power-On Resetr

Specifications of MAX811TEUS+T

• Number Of Voltages Monitored: 1
• Output: Push-Pull, Totem Pole
• Reset: Active Low
• Reset Timeout: 140 ms Minimum
• Voltage - Threshold: 3.08V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: SOT-143, SOT-143B, TO-253AA
• Monitored Voltage: 3 V or 3.3 V or 5 V
• Undervoltage Threshold: 3.03 V
• Overvoltage Threshold: 3.14 V
• Manual Reset: Resettable
• Watchdog: No
• Battery Backup Switching: No
• Power-up Reset Delay (typ): 560 ms
• Supply Voltage (min): 1.2 V
• Supply Current (typ): 2.7 uA (Typ)
• Maximum Power Dissipation: 320 mW
• Mounting Style: SMD/SMT
• Maximum Operating Temperature: + 85 C
• Chip Enable Signals: No
• Minimum Operating Temperature: - 40 C
• Output Type: Active Low or Push-Pull
• Power Fail Detection: No
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: MAX811TEUS+TTR

A microprocessor’s (µP’s) reset input starts the µP in a
known state. These µP supervisory circuits assert reset
to prevent code execution errors during power-up,
power-down, or brownout conditions.
RESET is guaranteed to be a logic low for V
Once V
timer keeps RESET low for the reset timeout period;
after this interval, RESET goes high.
If a brownout condition occurs (V
reset threshold), RESET goes low. Any time V
below the reset threshold, the internal timer resets to
zero, and RESET goes low. The internal timer starts
after V
remains low for the reset timeout period.
The manual reset input (MR) can also initiate a reset.
See the Manual Reset Input section.
The MAX812 has an active-high RESET output that is
the inverse of the MAX811’s RESET output.
______________________________________________________________ Pin Description
_______________ Detailed Description
MAX811
—
1
2
3
4
CC
PIN
CC
returns above the reset threshold, and RESET
MAX812
exceeds the reset threshold, an internal
—
1
2
3
4
_______________________________________________________________________________________
NAME
RESET
RESET
GND
V
MR
CC
Ground
Active-Low Reset Output. RESET remains low while V
MR is held low. RESET remains low for the Reset Active Timeout Period (t
conditions are terminated.
Active-High Reset Output. RESET remains high while V
MR is held low. RESET remains high for Reset Active Timeout Period (t
tions are terminated.
Manual Reset Input. A logic low on MR asserts reset. Reset remains asserted as long as MR is
low and for 180ms after MR returns high. This active-low input has an internal 20kΩ pull-up
resistor. It can be driven from a TTL or CMOS-logic line, or shorted to ground with a switch.
Leave open if unused.
+5V, +3.3V, or +3V Supply Voltage
CC
Reset Output
dips below the
CC
CC
> 1V.
goes
4-Pin µP Voltage Monitors
with Manual Reset Input
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 reset. Reset remains asserted while MR is low,
and for the Reset Active Timeout Period (t
returns high. This input has an internal 20kΩ pull-up
resistor, so it can be left open if it is not used. MR can
be driven with TTL or CMOS-logic levels, or with open-
drain/collector outputs. Connect a normally open
momentary switch from MR to GND to create a manual-
reset function; external debounce circuitry is not
required. If MR is driven from long cables or if the
device is used in a noisy environment, connecting a
0.1µF capacitor from MR to ground provides additional
noise immunity.
The MAX811/MAX812 are ideal for systems using a 5V
±5% or 3V ±5% power supply with ICs specified for 5V
±10% or 3V ±10%, respectively. They are designed to
meet worst-case specifications over temperature. The
reset is guaranteed to assert after the power supply
falls out of regulation, but before power drops below
the minimum specified operating voltage range for the
system ICs. The thresholds are pre-trimmed and exhibit
tight distribution, reducing the range over which an
undesirable reset may occur.
FUNCTION
CC
CC
is below the reset threshold or while
Reset Threshold Accuracy
is below the reset threshold or while
Manual Reset Input
RP
) after the reset condi-
RP
) after the reset
RP
) after MR
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