General Description
The MXD1810–MXD1813/MXD1815–MXD1818 family of
microprocessor (μP) reset circuits monitor power sup-
plies 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 push-button 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
Automotive Systems
Critical μP and μC Monitoring
Portable/Battery-Powered Equipment
*
Pg
Features
oPrecision Monitoring of +2.5V, +3V, +3.3V, and
+5V Power-Supply Voltages
oAvailable in Four Reset Output Configurations
oFactory-Set Reset Threshold Voltages: 2.18V,
2.31V, 2.55V, 2.88V, 3.06V, 4.12V, 4.37V, 4.62V
o±2.5% Reset Threshold Accuracy Over
Temperature
oFixed Reset Timeout Period: 100ms (min)
oGuaranteed RESET/RESET Valid to VCC = +1V
oDebounced Manual Reset
Detect (MXD1813/MXD1818)
oPower-Supply Transient Immunity
oNo External Components
oLow Power Consumption (4μA)
oPin Compatible with DS181_ Products (SOT23)
o3-Pin SC70 and SOT23 Packages
Low-Power μP Reset Circuits in 3-Pin
SC70/SOT23
________________________________________________________________
Maxim Integrated Products
1
Pin Configurations
19-2243; Rev 1; 12/05
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
The MXD1810–MXD1813/MXD1815–MXD1818 are available
with factory-set V
CC 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 “_ _” follow-
ing “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-free packaging.
Specify lead-free by replacing “-T” with “+T” when ordering.
Ordering Information continued at end of data sheet.
Ordering Information
PART TEMP RANGE PIN-PACKAGE
MXD1810UR_ _-T -40oC to +105oC 3 SOT23-3
MXD1810XR_ _-T -40oC to +105oC 3 SC70-3
RESET
(RESET)
1
3GND
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