Document
MXD1810–MXD1813/ MXD1815–MXD1818
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 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 pushpull RESET output. The MXD1810/MXD1815 (pushpull) and MXD1811/MXD1813/MXD1816/MD1818 (opendrain) 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
PART†
TEMP RANGE PIN-PACKAGE
MXD1810UR_ _-T -40°C to +105°C 3 SOT23
MXD1810XR_ _-T -40°C to +105°C 3 SC70
†The MXD1810–MXD1813/MXD1815–MXD1818 are available w(MitXh Dfa1c8t1o5ry–-MseXt DV1C8C18re) saentdth+r4e.s1h2oVldtsofr+o4m.62+V2.1(M8VXDto18+130.0–6V 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 packaging. Specify lead-free by replacing “-T” with “+T” when ordering.
Ordering Information continued at end of data sheet.
Pin Configurations
TOP VIEW
VCC 1
RESET (RESET)
1
MXD181_X 3 GND
MXD181_U 3 GND
RESET (RESET)
2
VCC 2
SC70-3
SOT23-3
() ARE FOR THE MXD1812/MXD1817
19-2243; Rev 2; 11/14
MXD1810–MXD1813/ MXD1815–MXD1818
Low-Power μP Reset Circuits in 3-Pin SC70/SOT23
Absolute Maximum Ratings
VCC to GND..........................................................-0.3V to +6.0V Push-Pull RESET (MXD1810/MXD1815),
RESET (MXD1812/MXD1817) to GND.... -0.3V to (VCC + 0.3V) Open-Drain RESET (MXD1811/MXD1816)
Output Current (RESET, RESET).......................................20mA Continuous Power Dissipation (TA = +70°C)
3-Pin SC70 (derate 2.17mW above +70°C)................174mW 3-Pin SOT23 (derate 4mW/°C above +70°C)..............320mW
to GND..............................................................-0.3V to +6.0V
Operating Temperature Range .........................-40°C to +105°C
Open-Drain RESET (MXD1813/MXD1818)
Junction Temperature......................................................+150°C
to GND.................................................. -0.3V to (VCC + 0.3V) Input Current (VCC, RESET)..............................................20mA
Storage Temperature Range .............................-65°C to +150°C Lead Temperature (soldering, 10s) .................................+300°C
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions.