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MXD1811UR41+T-MXD1816XR29+T
Low-Power µP Reset Circuits in 3-Pin SC70/SOT23
General DescriptionThe 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.†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 RANGEPIN-PACKAGE
MXD1810UR_ _-T-40°C to +105°C3 SOT23
MXD1810XR_ _-T-40°C to +105°C3 SC70
RESET
(RESET)GND
VCC
MXD181_X
SC70-3TOP VIEW
() ARE FOR THE MXD1812/MXD1817
RESET
(RESET)1GND
VCC
MXD181_U
SOT23-3
MXD1810–MXD1813/
MXD1815–MXD1818Low-Power μP Reset Circuits in 3-Pin SC70/SOT23
Ordering Information
Pin Conigurations
VCC to GND .........................................................-0.3V to +6.0VPush-Pull RESET (MXD1810/MXD1815), RESET (MXD1812/MXD1817) to GND ...-0.3V to (VCC + 0.3V)Open-Drain RESET (MXD1811/MXD1816) to GND ..............................................................-0.3V to +6.0VOpen-Drain RESET (MXD1813/MXD1818) to GND ..................................................-0.3V to (VCC + 0.3V)Input Current (VCC, RESET) ..............................................20mA
Output Current (RESET, RESET) ......................................20mAContinuous Power Dissipation (TA = +70°C) 3-Pin SC70 (derate 2.17mW above +70°C) ................174mW 3-Pin SOT23 (derate 4mW/°C above +70°C) .............320mWOperating Temperature Range .........................-40°C to +105°CJunction Temperature......................................................+150°CStorage Temperature Range .............................-65°C to +150°CLead Temperature (soldering, 10s) .................................+300°C
(VCC = full range, TA = -40°C to +105°C, unless otherwise specified. Typical values are at TA = +25°C.) (Note 1)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITSSupply Voltage RangeVCCTA = 0°C to +105°C1.05.5VTA = -40°C to +105°C1.25.5
Supply CurrentICCVCC = +5.5V, VCC > VTH, no load916µAVCC = +3.6V, VCC > VTH, no load410
Reset ThresholdVTH
MXD181_ _ R464.504.624.75
MXD181_ _ R444.254.374.49
MXD181_ _ R414.004.124.24
MXD181_ _ R312.983.063.15
MXD181_ _ R292.802.882.97
MXD181_ _ R262.472.552.64
MXD181_ _ R232.252.312.37
MXD181_ _ R222.122.182.25
Active Reset-Timeout PeriodtRPVCC rising100150250ms
VCC to Reset DelaytRDVCC = (VTH + 100mV) falling to (VTH - 200mV)25µs
VCC rising, tR = 5μs100150250ms
Push-Button Detect to ResettPBMXD1813/MXD1818 only1.5µs
Push-Button Reset-Timeout PeriodtPBRSTMXD1813/MXD1818 only100150250ms
Input Low VoltageVILMXD1813/MXD1818 only
TA = +25°C to +105°C0.34VTA = -40°C to +25°C0.15
Input High VoltageVIHMXD1813/MXD1818 only0.7 × VCCV
RESET Output Source CurrentIOHVCC ≥ VTH(MAX), reset not asserted,
MXD1810/MXD1815350μA
RESET Output Source CurrentIOHVCC ≥ VTH(MAX), reset asserted, MXD1812/MXD1817350μA
RESET Output Sink CurrentIOLVCC ≥ 2.7V, reset asserted, VOUT = 0.4V
MXD1810/MXD1811/MXD1813/MXD1815/ MXD1816/MXD1818 (Note 2)mA
RESET Output Sink CurrentIOLVCC ≥ 2.7V, reset not asserted, VOUT = 0.4V MXD1812/MXD181710mA
MXD1810–MXD1813/
MXD1815–MXD1818Low-Power μP Reset Circuits in 3-Pin SC70/SOT23
Absolute Maximum RatingsStresses 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 beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect
device reliability.
Electrical Characteristics
(VCC = full range, TA = -40°C to +105°C, unless otherwise specified. Typical values are at TA = +25°C.) (Note 1)
Note 1: Production testing done at TA = +25°C; limits over temperature guaranteed by design.
Note 2: The MXD1811/MXD1813/MXD1816/MXD1818 have an internal pullup resistor which may deliver 1mA of sink current.
Note 3: Guaranteed by design.
(TA = +25°C, unless otherwise noted.)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITSOutput High VoltageVOH0 < IOH < 500μAVCC - 0.5VCC - 0.1V
Output Capacitance (Note 2)COUT10pF
Internal Pullup Resistor, Open-DrainRPMXD1811/MXD18163.55.57.5kΩMXD1813/MXD18183.15.57.5
RESET TIMEOUT PERIOD
vs. TEMPERATURE (VCC RISING)
MXD1810-13/15-18 toc02
TEMPERATURE (°C)
TIMEOUT PERIOD (ms)
VCC = +2.5V
VCC = +5V
NORMALIZED RESET THRESHOLD
vs. TEMPERATURE (VCC FALLING)
MXD1810-13/15-18 toc03
TEMPERATURE (°C)
NORMALIZED RESET
THRESHO
VTH = +4.62V
VTH = +2.18V
POWER-DOWN RESET DELAY
vs. TEMPERATURE
MXD1810-13/15-18 toc04
POWER-DOWN RESET DELAY (µs)
VTH = +4.62V
VTH = +2.18V
MAXIMUM TRANSIENT DURATION
vs. RESET THRESHOLD OVERDRIVE
MXD1810-13/15 toc05
MAXIMUM TRANSIENT DURATION (µs)
RESET OCCURS
ABOVE THIS LINE
OUTPUT VOLTAGE
vs. OUTPUT SINK CURRENT
MXD1810-13/15-18 toc06
OUTPUT VOLTAGE (mV)
SUPPLY CURRENT vs. TEMPERATURE
MXD1810-13/15-18 toc01
TEMPERATURE (°C)
SUPPLY CURRENT (µA)
RESET/RESET NOT ASSERTED
VCC = +2.5V
VCC = +3.3V
VCC = +5V
MXD1810–MXD1813/
MXD1815–MXD1818Low-Power μP Reset Circuits in 3-Pin SC70/SOT23
Electrical Characteristics (continued)
Typical Operating Characteristics
(TA = +25°C, unless otherwise noted.)
PINNAMEFUNCTIONSC70SOT231RESETPush-Pull, Active-Low Reset Output. RESET changes from high to low when VCC drops below the selected reset threshold. RESET remains low for the reset timeout period after VCC exceeds the device reset threshold.2VCCSupply Voltage and Input for Reset-Threshold Monitor3GNDGround
PINNAMEFUNCTIONSC70SOT231RESETOpen-Drain, Active-Low Reset Output. RESET changes from high to low when VCC drops below the selected reset threshold. RESET remains low for the reset timeout period after VCC exceeds the device reset threshold. RESET has an internal 5.5kΩ pullup resistor.2VCCSupply Voltage and Input for Reset-Threshold Monitor3GNDGround
OUTPUT VOLTAGE
vs. OUTPUT SOURCE CURRENT
MXD1810-13/15-18 toc07
OUTPUT CURRENT (mA)
- V
OUT
(V)
INPUT LOW VOLTAGE
vs. VCC AND TEMPERATURE
MXD1810-13/15 toc08
TEMPERATURE (°C)
INPUT
LOW VOLTAGE (V)
VCC = +5.5V
VCC = +2.2V
MXD1810–MXD1813/
MXD1815–MXD1818Low-Power μP Reset Circuits in 3-Pin SC70/SOT23
Pin Descriptions
Typical Operating Characteristics (continued)
MXD1810/MXD1815
MXD1811/MXD1816
Detailed Description
RESET/RESET Outputmicroprocessor’s (μP’s) reset input starts the micro-processor in a known state. The MXD1810–MXD1813/MXD1815–MXD1818 μP supervisory circuits assert reset to prevent code-execution errors during power-up, power-down, and brownout conditions (Figure 4). Whenever VCC falls below the reset threshold, the reset output asserts. Once VCC exceeds the reset threshold, an internal timer keeps the reset output asserted for the specified reset timeout period (tRP). Reset is also triggered by an externally initiated rising edge on the
RESET pin (MXD1813/MXD1818), following a low signal of 1.5μs minimum duration.
Push-Button Reset (MXD1813/MXD1818)Many μP-based products require push-button reset capability (Figure 5), allowing the operator, a test technician, or external logic circuitry to initiate reset. On the MXD1813/MXD1818, a logic-low on RESET held for greater than 1.5μs asserts a reset. RESET deasserts following a 100ms minimum reset timeout
delay (tPBRST). A manual-reset input shorter than 1.5μs
may release RESET without the 100ms minimum reset timeout delay. To facilitate use with mechanical switches, the MXD1813/MXD1818 contain internal debouncing circuitry. A debounced waveform is shown in Figure 6.
Applications Information
Interfacing to μPs with Bidirectional
Reset PinsSince the RESET output on the MXD1811/MXD1816 is open drain, these devices interface easily with μPs that have bidirectional reset pins, such as the Motorola 68HC11. Connecting the μP supervisor’s RESET output directly to the microcontroller’s (μC’s) RESET pin allows either device to assert reset (Figure 7). No external pullup resistor is required, as it is contained within the MXD1811/MXD1816.
Negative-Going VCC TransientsIn addition to issuing a reset to the μP during power-up, power-down, and brownout conditions, these devices are relatively immune to short-duration, negative-going VCC transients (glitches).
PINNAMEFUNCTIONSC70SOT231RESETPush-Pull, Active-High Reset Output. RESET changes from low to high when VCC drops below the selected reset threshold. RESET remains high for the reset timeout period after VCC exceeds the device reset threshold.2VCCSupply Voltage and Input for Reset- Threshold Monitor3GNDGround
PINNAMEFUNCTIONSC70SOT231RESET
Open-Drain, Active-Low Reset Output with Manual Reset Detect. RESET changes from high to low when VCC drops below the selected reset threshold, or RESET is externally pulled low for at least 1.5μs. RESET remains low for the reset timeout period after VCC exceeds the device reset threshold or after the external manual reset is released. RESET has an internal 5.5kΩ pullup resistor.2VCCSupply Voltage and Input for Reset-Threshold Monitor3GNDGround
MXD1810–MXD1813/
MXD1815–MXD1818Low-Power μP Reset Circuits in 3-Pin SC70/SOT23
Pin Description (continued)
MXD1812/MXD1817
MXD1813/MXD1818
The Typical Operating Characteristics show the Maximum Transient Duration vs. Reset Threshold Overdrive for which reset pulses are not generated. The graph shows the maximum pulse width that a negative-going VCC transient may typically have without issuing a reset signal. As the amplitude of the transient increases, the maximum allowable pulse width decreases.
Ensuring a Valid Reset Output Down to
VCC = 0When VCC falls below the minimum operating voltage, push-pull-structured reset sinking (or sourcing) capabili-ties decrease dramatically. High-impedance CMOSlogic inputs connected to the RESET/RESET pin can drift to indeterminate voltages. This does not present a problem in most cases, since most μPs and circuitry do not operate at VCC below +1V. For MXD1810/MXD1815 applications where RESET must be valid down to VCC = 0, adding a pulldown resistor between RESET and GND removes stray leakage currents, holding RESET low (Figure 8). The pulldown resistor value is not critical; 100kΩ is large enough not to load RESET and small enough to pull
RESET low. For MXD1812/ MXD1817 applications where
Figure 3. Functional Diagram, Open-Drain Active-Low Output
with Manual Reset Detection
Figure 1. Functional Diagram, Push-Pull OutputFigure 2. Functional Diagram, Open-Drain Active-Low Output
MONITOR
VREF
VCC
RESET
MXD1813
MXD1818RESET
GENERATOR
RESET
GENERATOR
VREF
VCC
RESET
RESET
MXD1810
MXD1812
MXD1815
MXD1817RESET
GENERATOR
VREF
VCC
RESET
MXD1811
MXD1816MXD1810–MXD1813/
MXD1815–MXD1818Low-Power μP Reset Circuits in 3-Pin SC70/SOT23
Functional Diagram
