General Description
The MXD1810–MXD1813/MXD1815–MXD1818 fam-
ily of microprocessor (μP) reset circuits monitor power
supplies in μP and digital systems. These devices
provide excellent circuit reliability and low cost by
eliminating external components and adjustments when
used with +2.5V/+3.0V/+3.3V (MXD1815–MXD1818),
and +5V (MXD1810–MXD1813) systems.
These circuits assert a reset signal whenever the VCC
supply voltage declines below a preset threshold, keeping
reset asserted for at least 100ms after VCC rises above the
reset threshold. The MXD1813/MXD1818 also keep reset
asserted for at least 100ms after the output is momentarily
pulled to GND by an external pushbutton switch.
The MXD1812/MXD1817 have an active-high push-
pull RESET output. The MXD1810/MXD1815 (push-
pull) and MXD1811/MXD1813/MXD1816/MD1818 (open-
drain) have an active-low RESET output. The open-drain
devices (MXD1811/MXD1813/MXD1816/MXD1818)
have an internal pullup resistor to VCC. The MXD1813/
MXD1818 feature a debounced manual-reset feature that
asserts a reset if the RESET pin is pulled low for more
than 1.5μs. When used to initiate manual reset, RESET
debounces signals from devices such as mechanical
switches. For devices with this feature, the release of the
external switch triggers the reset period.
The MXD1810–MXD1813/MXD1815–MXD1818 are
guaranteed to output the correct logic state for VCC down
to +1V. These ICs provide a reset comparator designed
to ignore fast transients on VCC. Reset thresholds are
available between +2.18V and +4.62V. These
small, low-power (4μA) devices are ideal for use in
portable equipment. All are available in space-saving
3-pin SC70 and SOT23 packages, and are specified from
-40°C to +105°C.
Applications
● Computers and Controllers
● Intelligent Instruments
● Set-Top Boxes
● Printers
● Critical μP and μC Monitoring
● Portable/Battery-Powered Equipment
Features
● Precision Monitoring of +2.5V, +3V, +3.3V, and +5V
Power-Supply Voltages
● Available in Four Reset Output Configurations
● Factory-Set Reset Threshold Voltages: 2.18V,
2.31V, 2.55V, 2.88V, 3.06V, 4.12V, 4.37V, 4.62V
● ±2.5% Reset Threshold Accuracy Over Temperature
● Fixed Reset Timeout Period: 100ms (min)
● Guaranteed RESET/RESET Valid to VCC = +1V
● Debounced Manual-Reset Detect (MXD1813/
MXD1818)
● Power-Supply Transient Immunity
● No External Components
● Low Power Consumption (4μA)
● Pin Compatible with DS181_ Products (SOT23)
● 3-Pin SC70 and SOT23 Packages
Ordering Information continued at end of data sheet.
19-2243; Rev 2; 11/14
†The MXD1810–MXD1813/MXD1815–MXD1818 are available
with factory-set VCC reset thresholds from +2.18V to +3.06V
(MXD1815–MXD1818) and +4.12V to +4.62V (MXD1810–
MXD1813). Choose the desired reset-threshold suffix from the
Reset Threshold Table and insert it in place of the “_ _”
following “R” in the part number. All devices are available in
tape-and-reel only in 2500 unit increments. Other threshold
voltages may be available. Contact factory for availability.
Devices are available in both leaded and lead(Pb)-free packag-
ing. Specify lead-free by replacing “-T” with “+T” when ordering.
PART†TEMP RANGE PIN-PACKAGE
MXD1810UR_ _-T -40°C to +105°C 3 SOT23
MXD1810XR_ _-T -40°C to +105°C 3 SC70
RESET
(RESET)
1
3 GND
VCC
MXD181_X
SC70-3
TOP VIEW
2
() ARE FOR THE MXD1812/MXD1817
RESET
(RESET) 1
3GND
VCC
MXD181_U
SOT23-3
2
MXD1810–MXD1813/
MXD1815–MXD1818
Low-Power μP Reset Circuits in 3-Pin
SC70/SOT23
Ordering Information
Pin Congurations