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Maxim Integrated - Low-Power UP Reset Circuits in 3-Pin

Numéro de référence MXD1818UR
Description Low-Power UP Reset Circuits in 3-Pin
Fabricant Maxim Integrated 
Logo Maxim Integrated 





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MXD1818UR fiche technique
19-2243; Rev 0; 10/01
Low-Power µP Reset Circuits in 3-Pin
SC70/SOT23
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
*Patent pending
Features
o Precision Monitoring of +2.5V, +3V, +3.3V, and
+5V Power-Supply Voltages
o Available in Four Reset Output Configurations
o Factory-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
o Fixed Reset Timeout Period: 100ms (min)
o Guaranteed RESET/RESET Valid to VCC = +1V
o Debounced Manual Reset Detect
(MXD1813/MXD1818)
o Power-Supply Transient Immunity
o No External Components
o Low Power Consumption (4µA)
o Pin Compatible with DS181_ Products (SOT23)
o 3-Pin SC70 and SOT23 Packages
Ordering Information
PART
TEMP. RANGE PIN-PACKAGE
MXD1810UR_ _-T -40oC to +105oC
3 SOT23-3
MXD1810XR_ _-T
-40oC to +105oC
3 SC70-3
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 “_ _” 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.
Ordering Information continued at end of data sheet.
Pin Configurations
TOP VIEW
VCC 1
RESET
(RESET)
2
MXD181_X
3 GND
RESET
(RESET)
1
VCC 2
MXD181_U
3 GND
SC70-3
SOT23-3
() ARE FOR THE MXD1812/MXD1817
________________________________________________________________ Maxim Integrated Products 1
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.

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