MXD1818XR29+T

MXD1810–MXD1813/ MXD1815–MXD1818 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 Low-Power μP Reset Circuits in 3-Pin SC70/SOT23 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 MXD1810UR_ _-T -40°C to +105°C 3 SOT23 MXD1810XR_ _-T -40°C to +105°C 3 SC70 PIN-PACKAGE †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 packaging. Specify lead-free by replacing “-T” with “+T” when ordering. Ordering Information continued at end of data sheet. Pin Configurations TOP VIEW RESET 1 (RESET) VCC 1 MXD181_U 3 GND MXD181_X 3 GND RESET 2 (RESET) 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) to GND...............................................................-0.3V to +6.0V Open-Drain RESET (MXD1813/MXD1818) to GND................................................... -0.3V to (VCC + 0.3V) Input Current (VCC, RESET)...............................................20mA 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 Operating Temperature Range .........................-40°C to +105°C Junction Temperature......................................................+150°C 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 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) PARAMETER SYMBOL Supply Voltage Range VCC Supply Current ICC Reset Threshold VTH Active Reset-Timeout Period tRP VCC to Reset Delay tRD Push-Button Detect to Reset Push-Button Reset-Timeout Period tPB tPBRST CONDITIONS TA = 0°C to +105°C TA = -40°C to +105°C MIN TYP 5.5 1.2 5.5 VCC = +5.5V, VCC > VTH, no load VCC = +3.6V, VCC > VTH, no load MAX 1.0 9 16 4 10 UNITS V µA MXD181_ _ R46 4.50 4.62 4.75 MXD181_ _ R44 4.25 4.37 4.49 MXD181_ _ R41 4.00 4.12 4.24 MXD181_ _ R31 2.98 3.06 3.15 MXD181_ _ R29 2.80 2.88 2.97 MXD181_ _ R26 2.47 2.55 2.64 MXD181_ _ R23 2.25 2.31 2.37 MXD181_ _ R22 2.12 2.18 2.25 VCC rising 100 150 250 2 5 µs VCC rising, tR = 5μs 100 150 250 ms MXD1813/MXD1818 only 1.5 MXD1813/MXD1818 only 100 150 250 ms VCC = (VTH + 100mV) falling to (VTH - 200mV) V ms µs TA = +25°C to +105°C 0.34 Input Low Voltage VIL MXD1813/MXD1818 only Input High Voltage VIH MXD1813/MXD1818 only RESET Output Source Current IOH VCC ≥ VTH(MAX), reset not asserted, MXD1810/MXD1815 350 μA RESET Output Source Current IOH VCC ≥ VTH(MAX), reset asserted, MXD1812/MXD1817 350 μA RESET Output Sink Current IOL VCC ≥ 2.7V, reset asserted, VOUT = 0.4V MXD1810/MXD1811/MXD1813/MXD1815/ MXD1816/MXD1818 (Note 2) 10 mA RESET Output Sink Current IOL VCC ≥ 2.7V, reset not asserted, VOUT = 0.4V MXD1812/MXD1817 10 mA www.maximintegrated.com TA = -40°C to +25°C 0.15 0.7 × VCC V V Maxim Integrated │  2 MXD1810–MXD1813/ MXD1815–MXD1818 Low-Power μP Reset Circuits in 3-Pin SC70/SOT23 Electrical Characteristics (continued) (VCC = full range, TA = -40°C to +105°C, unless otherwise specified. Typical values are at TA = +25°C.) (Note 1) PARAMETER SYMBOL Output High Voltage VOH Output Capacitance (Note 2) COUT Internal Pullup Resistor, Open-Drain CONDITIONS 0 < IOH < 500μA MIN TYP VCC 0.5 VCC 0.1 3.5 5.5 MAX UNITS V 10 MXD1811/MXD1816 RP 7.5 MXD1813/MXD1818 3.1 5.5 7.5 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. pF kΩ Typical Operating Characteristics (TA = +25°C, unless otherwise noted.) VCC = +3.3V VCC = +2.5V 0 -04 -01 144 20 50 80 TEMPERATURE (°C) 140 110 POWER-DOWN RESET DELAY vs. TEMPERATURE 2.5 VTH = +4.62V 1.5 1.0 VTH = +2.18V 0.5 0 -40 -10 20 50 80 TEMPERATURE (°C) www.maximintegrated.com 110 100 MAXIMUM TRANSIENT DURATION (µs) MXD1810-13/15-18 toc04 POWER-DOWN RESET DELAY (µs) 3.0 2.0 VCC = +2.5V 148 -40 -10 20 50 80 TEMPERATURE (°C) 80 60 MXD1810-13/15-18 toc03 1.000 VTH = +2.18V 0.995 -40 -10 20 50 80 TEMPERATURE (°C) 110 OUTPUT VOLTAGE vs. OUTPUT SINK CURRENT MAXIMUM TRANSIENT DURATION vs. RESET THRESHOLD OVERDRIVE 90 70 VTH = +4.62V 0.990 110 MXD1810-13/15 toc05 2 152 1.005 RESET OCCURS ABOVE THIS LINE 50 40 30 20 200 MXD1810-13/15-18 toc06 4 VCC = +5V NORMALIZED RESET THRESHOLD 6 156 NORMALIZED RESET THRESHOLD vs. TEMPERATURE (VCC FALLING) 1.010 OUTPUT VOLTAGE (mV) VCC = +5V 8 160 TIMEOUT PERIOD (ms) RESET/RESET NOT ASSERTED MXD1810-13/15-18 toc01 SUPPLY CURRENT (µA) 10 MXD1810-13/15-18 toc02 RESET TIMEOUT PERIOD vs. TEMPERATURE (VCC RISING) SUPPLY CURRENT vs. TEMPERATURE 160 120 80 40 10 0 10 100 1000 RESET THRESHOLD OVERDRIVE, VTH - VCC (mV) 0 0 3 6 9 12 OUTPUT CURRENT (mA) 15 Maxim Integrated │  3 MXD1810–MXD1813/ MXD1815–MXD1818 Low-Power μP Reset Circuits in 3-Pin SC70/SOT23 Typical Operating Characteristics (continued) (TA = +25°C, unless otherwise noted.) OUTPUT VOLTAGE vs. OUTPUT SOURCE CURRENT VCC - VOUT (V) 0.3 0.2 VCC = +5.5V 0.6 0.4 VCC = +2.2V 0.1 0 0 0.5 1.0 1.5 2.5 2.0 OUTPUT CURRENT (mA) 3.0 MXD1810-13/15 toc08 0.4 0.8 INPUT LOW VOLTAGE (V) MXD1810-13/15-18 toc07 0.5 INPUT LOW VOLTAGE vs. VCC AND TEMPERATURE 0.2 -40 -10 20 50 80 TEMPERATURE (°C) 110 Pin Descriptions MXD1810/MXD1815 PIN NAME SC70 SOT23 2 1 RESET 1 2 3 3 VCC GND FUNCTION Push-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. Supply Voltage and Input for Reset-Threshold Monitor Ground MXD1811/MXD1816 PIN NAME SC70 SOT23 2 1 RESET 1 2 3 3 VCC www.maximintegrated.com GND FUNCTION Open-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. Supply Voltage and Input for Reset-Threshold Monitor Ground Maxim Integrated │  4 MXD1810–MXD1813/ MXD1815–MXD1818 Low-Power μP Reset Circuits in 3-Pin SC70/SOT23 Pin Description (continued) MXD1812/MXD1817 PIN SC70 SOT23 2 1 1 2 3 3 NAME RESET VCC GND FUNCTION Push-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. Supply Voltage and Input for Reset- Threshold Monitor Ground MXD1813/MXD1818 PIN SC70 NAME SOT23 2 1 RESET 1 2 3 3 VCC GND FUNCTION 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. Supply Voltage and Input for Reset-Threshold Monitor Ground Detailed Description RESET/RESET Output A microprocessor’s (μP’s) reset input starts the microprocessor in a known state. The MXD1810–MXD1813/ MXD1815–MXD1818 μP supervisory circuits assert reset to prevent code-execution errors during power-up, powerdown, 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 www.maximintegrated.com 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 Pins Since 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 Transients In 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). Maxim Integrated │  5 MXD1810–MXD1813/ MXD1815–MXD1818 Low-Power μP Reset Circuits in 3-Pin SC70/SOT23 Functional Diagram MXD1810 MXD1812 MXD1815 MXD1817 VCC MXD1811 MXD1816 VCC RESET RESET GENERATOR VREF VREF Figure 1. Functional Diagram, Push-Pull Output Figure 2. Functional Diagram, Open-Drain Active-Low Output 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. MXD1813 MXD1818 VCC Ensuring a Valid Reset Output Down to VCC = 0 MR MONITOR RESET GENERATOR RESET VREF Figure 3. Functional Diagram, Open-Drain Active-Low Output with Manual Reset Detection www.maximintegrated.com RESET GENERATOR RESET OR RESET When VCC falls below the minimum operating voltage, push-pull-structured reset sinking (or sourcing) capabilities 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 Maxim Integrated │  6 MXD1810–MXD1813/ MXD1815–MXD1818 Low-Power μP Reset Circuits in 3-Pin SC70/SOT23 VCC VCC VTH MXD1813 MXD1818 VCC tRP RESET RESET VCC(MIN) GND RESET MANUAL RESET tRP RESET Figure 4. Power-Up Reset Timing Diagram Figure 5. Push-Button Manual Reset VCC tPBRST tPBRST (OPEN) SWITCH BOUNCE EXTERNAL PUSH BUTTON (CLOSED) RESET Figure 6. Manual Reset Timing Diagram RESET must be valid to VCC = 0, a 100kΩ pullup resistor between RESET and VCC holds RESET high when VCC falls below the minimum operating voltage (Figure 9). The MXD1811/MXD1813/MXD1816/MXD1818 have open-drain, active-low outputs with a pullup resistor included internal to the devices. While using these devices, RESET will most likely not maintain an active www.maximintegrated.com condition when the supply voltage drops below the minimum VCC, but will drift to a nonactive level due to the pullup resistor and the reduced sinking capability of the open-drain output. Therefore, these devices are not recommended for applications where the RESET pin is required to be valid at VCC = 0. Maxim Integrated │  7 MXD1810–MXD1813/ MXD1815–MXD1818 Low-Power μP Reset Circuits in 3-Pin SC70/SOT23 Table 1. Device Marking Codes VCC PART VCC VCC MXD1811 MXD1816 RESET µP RESET GND GND RPULLDOWN* AHT FZKF AHW MXD1811_R44 FZIW AEL MXD1811_R41 FZKE AHV FZIX AEM MXD1813_R46 FZIY AEN MXD1813_R44 FZKJ AIA MXD1813_R41 FZKI AHZ MXD1815_R31 FZKN AIE MXD1815_R29 FZIZ AEO MXD1815_R26 FZKM AID MXD1815_R23 FZKL AIC MXD1815_R22 FZKK AIB µP MXD1816_R31 FZKR AII MXD1816_R29 FZKQ AIH GND MXD1816_R26 FZKP AIG MXD1816_R23 FZKO AIF MXD1816_R22 FZJA AEP MXD1817_R31 FZJB AEQ MXD1817_R29 FZKV AIM MXD1817_R26 FZKU AIL MXD1817_R23 FZKT AIK MXD1817_R22 FZKS AIJ VCC VCC RESET FZKC MXD1811_R46 MXD1812_R41 VCC RESET MXD1810_R41 AHY Figure 8. Ensuring Valid RESET Output Down to VCC = 0 (MXD1810/MXD1815 only) MXD1812 MXD1817 AHU AHX *MXD1810/MXD1815 ONLY RPULLUP* FZKD FZKH VCC GND AEK MXD1810_R44 FZKG VCC RESET FZIV MXD1812_R44 VCC RESET SC70 MXD1810_R46 MXD1812_R46 Figure 7. Interfacing to Microprocessors with Bidirectional Reset Pins MXD1810 MXD1815 TOP MARK SOT23 MXD1818_R31 FZKY AIP MXD1818_R29 FZKX AIO MXD1818_R26 FZJC AER MXD1818_R23 FZKW AIN MXD1818_R22 FZJE AEV µP GND GND *MXD1812/MXD1817 ONLY Figure 9. Ensuring Valid RESET Output Down to VCC = 0 (MXD1812/MXD1817 only) www.maximintegrated.com Maxim Integrated │  8 MXD1810–MXD1813/ MXD1815–MXD1818 Low-Power μP Reset Circuits in 3-Pin SC70/SOT23 Selector Guide PUSH-PULL RESET OPEN-DRAIN RESET PUSH-PULL RESET OPEN-DRAIN RESET WITH PUSHBUTTON DETECT PART 5V SYSTEMS 2.5V/3.0V/3.3V SYSTEMS MXD1810 ✔ — ✔ — — — MXD1811 ✔ — — ✔ — — MXD1812 ✔ — — — ✔ — MXD1813 ✔ — — — — ✔ MXD1815 — ✔ — — — MXD1816 — ✔ ✔ — ✔ — — MXD1817 — ✔ — — ✔ — — ✔ — — — ✔ MXD1818 Ordering Information (continued) PART† TEMP RANGE MXD1811UR_ _-T -40°C to +105°C 3 SOT23 MXD1811XR_ _-T -40°C to +105°C MXD1812UR_ _-T -40°C to +105°C MXD1812XR_ _-T MXD1813UR_ _-T PIN-PACKAGE Reset Threshold Table PART SUFFIX (_ _) TYP. RESET THRESHOLD (V)* 3 SC70 MXD1810–MXD1813 46 4.62 3 SOT23 MXD1810–MXD1813 44 4.37 -40°C to +105°C 3 SC70 MXD1810–MXD1813 41 4.12 -40°C to +105°C 3 SOT23 MXD1815–MXD1818 31 3.06 MXD1813XR_ _-T -40°C to +105°C 3 SC70 MXD1815–MXD1818 29 2.88 MXD1815UR_ _-T -40°C to +105°C 3 SOT23 MXD1815–MXD1818 26 2.55 MXD1815XR_ _-T -40°C to +105°C 3 SC70 MXD1815–MXD1818 23 2.31 MXD1816UR_ _-T -40°C to +105°C 3 SOT23 MXD1815–MXD1818 22 2.18 MXD1816XR_ _-T -40°C to +105°C 3 SC70 MXD1817UR_ _-T -40°C to +105°C 3 SOT23 MXD1817XR_ _-T -40°C to +105°C 3 SC70 MXD1818UR_ _-T -40°C to +105°C 3 SOT23 MXD1818XR_ _-T -40°C to +105°C 3 SC70 †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 packaging. Specify lead-free by replacing “-T” with “+T” when ordering. www.maximintegrated.com *Factory-trimmed reset thresholds are nominally ±1.5% at room temperature. Chip Information PROCESS TECHNOLOGY: BiCMOS Package Information For the latest package outline information and land patterns (footprints), go to www.maximintegrated.com/packages. Note that a “+”, “#”, or “-” in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the package regardless of RoHS status. PACKAGE TYPE PACKAGE CODE OUTLINE NO. LAND PATTERN NO. 3 SC70 X3-2 21-0075 90-0208 3 SOT23 U3-1 21-0051 90-0179 Maxim Integrated │  9 MXD1810–MXD1813/ MXD1815–MXD1818 Low-Power μP Reset Circuits in 3-Pin SC70/SOT23 Revision History REVISION NUMBER REVISION DATE PAGES CHANGED 1 12/05 Miscellaneous updates 2 11/14 No /V OPN in Ordering Information, removed automotive reference from Applications section; updated Packaging Information DESCRIPTION 1,9-11 1, 10, 11 For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim Integrated’s website at www.maximintegrated.com. Maxim Integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim Integrated product. No circuit patent licenses are implied. Maxim Integrated reserves the right to change the circuitry and specifications without notice at any time. The parametric values (min and max limits) shown in the Electrical Characteristics table are guaranteed. Other parametric values quoted in this data sheet are provided for guidance. Maxim Integrated and the Maxim Integrated logo are trademarks of Maxim Integrated Products, Inc. ©  2014 Maxim Integrated Products, Inc. │  10