MAX701ESA+G002

MAX700/MAX701/MAX702 Power-Supply Monitor with Reset General Description The MAX700/MAX701/MAX702 are supervisory circuits used to monitor the power supplies in microprocessor (µP) and digital systems. The RESET/RESET outputs of the MAX700/MAX701/MAX702 are guaranteed to be in the correct state for VCC voltages down to +1V (Figure 4). They provide excellent circuit reliability and low cost by eliminating external components and adjustments when used with +5V-powered circuits. The MAX702 is the simplest part in the family. When VCC falls to 4.65V, RESET goes low. The MAX702 also provides a debounced manual-reset input. The MAX701 performs the same functions but has both RESET and RESET outputs. Their primary function is to provide a system reset. Accordingly, an active reset signal is supplied for low supply voltages and for at least 200ms after the supply voltage reaches its operating value. In addition to the features of the MAX701 and MAX702, the MAX700 provides preset or adjustable-voltage detection so thresholds other than 4.65V can be selected, and adjustable hysteresis. All parts are supplied in 8-pin PDIP and narrow-SO packages in commercial and extended temperature ranges. Applications ●● ●● ●● ●● Computers Controllers Intelligent Instruments Critical µP Power Monitoring Features ●● Min 200ms RESET Pulse on Power-Up, PowerDown, and During Low-Voltage Conditions ●● Reset Threshold Factory Trimmed for +5V Systems ●● No External Components or Adjustments with +5V-Powered Circuits ●● Debounced Manual-Reset Input ●● Preset or Adjustable-Voltage Detection (MAX700) ●● Adjustable Hysteresis (MAX700) ●● 8-Pin PDIP and Narrow-SO Packages Ordering Information PART* TEMP RANGE PIN-PACKAGE MAX700C/D 0°C to +70°C MAX700CPA 0°C to +70°C 8 PDIP MAX700CSA 0°C to +70°C 8 Narrow SO MAX700EPA -40°C to +85°C 8 PDIP MAX700ESA -40°C to +85°C 8 Narrow SO MAX701C/D 0°C to +70°C MAX701CPA 0°C to +70°C 8 PDIP MAX701CSA 0°C to +70°C 8 Narrow SO MAX701EPA -40°C to +85°C 8 PDIP MAX701ESA -40°C to +85°C 8 Narrow SO MAX702C/D 0°C to +70°C Dice MAX702CPA 0°C to +70°C 8 PDIP MAX702CSA 0°C to +70°C 8 Narrow SO MAX702EPA -40°C to +85°C Dice Dice 8 PDIP MAX702ESA -40°C to +85°C 8 Narrow SO *Devices in PDIP and SO packages are available in both leaded and lead(Pb)-free packaging. Specify lead free by adding the + symbol at the end of the part number when ordering. Pin Configurations TOP VIEW 1 8 VCC MR 1 7 N.C. VCC 2 3 6 RESET GND GND 4 5 RESET 8 VCC MR 1 7 CTL N.C. 2 3 6 RESET N.C. GND 4 5 RESET MR SENSE 2 HYST MAX700 DIP/SO 19-2690; Rev 3; 5/14 MAX701 DIP/SO 8 N.C. 7 RESET 3 6 N.C. N.C. 4 5 N.C. MAX702 DIP/SO MAX700/MAX701/MAX702 Power-Supply Monitor with Reset Absolute Maximum Ratings VCC......................................................................-0.3V to +15.5V Voltage (with respect to GND) at RESET, RESET, HYST, CTL, SENSE............................................ -0.3V to VCC Operating Temperature Range C Suffix................................................................0°C to +70°C E Suffix............................................................ -40°C to +85°C Rate of Rise, VCC...........................................................100V/µs Power Dissipation, Any Package.....................................380mW Storage Temperature Range............................. -55°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 = +5V, CTL = GND on MAX700, TA = +25°C, unless otherwise noted.) PARAMETER CONDITIONS VCC Monitor Voltage Range (MAX700 Only) TA = TMIN to TMAX, CTL = VCC Min VCC for Valid Reset Output, Declining Supply TA = TMIN to TMAX, VRESET ≤ 0.4V when sinking 1mA MIN 3 1.5 Supply Current Reset Threshold TA = TMIN to TMAX Internal Hysteresis HYST not connected TYP MAX UNITS 15 V 1 V 100 200 Power-up 4.50 4.65 4.75 Power-down 4.50 4.62 4.75 30 Reset Output Pulse Width 200 RESET Fall Time MAX700/MAX701 only, CLOAD = 100pF VCC Pulse Duration Guaranteeing 5V to 4V VCC pulse 10 100 500 0.7 MR Pullup Current -5 ms ns 1 10 MR Input Threshold V mV 200 No reset Reset 350 µA µs V -30 µA MAX700 RESET Output Low RESET Output High RESET Output Low RESET Output High www.maximintegrated.com ISINK = 3.2mA, VCC = 5V 0.4 ISINK = 1.6mA, VCC = 3V 0.4 ISOURCE = 3.2mA, VCC = 4.25V VCC - 0.4 ISOURCE = 1.6mA, VCC = 3V VCC - 0.4 ISOURCE = 0.5mA, VCC = 1.5V VCC - 0.4 V ISINK = 16mA, VCC = 4.25V 0.4 ISINK = 1.6mA, VCC = 3V 0.4 ISINK = 0.4mA, VCC = 1.5V 0.4 ISOURCE = 3.2mA, VCC = 5V VCC - 0.4 ISOURCE = 1.6mA, VCC = 3V VCC - 0.4 V V V Maxim Integrated │  2 MAX700/MAX701/MAX702 Power-Supply Monitor with Reset Electrical Characteristics (continued) (VCC = +5V, CTL = GND on MAX700, TA = +25°C, unless otherwise noted.) PARAMETER CONDITIONS MIN TYP MAX UNITS 0.4 V MAX701 RESET Output Low RESET Output High RESET Output Low RESET Output High ISINK = 16mA, VCC = 5V ISOURCE = 3.2mA, VCC = 4.25V VCC - 0.4 ISOURCE = 1.6mA, VCC = 3V VCC - 0.4 ISOURCE = 0.5mA, VCC = 1.5V VCC - 0.4 V ISINK = 3.2mA, VCC = 4.25V 0.4 ISINK = 1.6mA, VCC = 3V ISINK = 0.4mA, VCC = 1.5V 0.4 ISOURCE = 3.2mA, VCC = 5V V 0.4 VCC - 0.4 V MAX702 RESET Output Low RESET Output High ISINK = 3.2mA, VCC = 4.25V 0.4 ISINK = 1.6mA, VCC = 3V 0.4 ISINK = 0.4mA, VCC = 1.5V 0.4 ISOURCE = 3.2mA, VCC = 5V VCC - 0.4 V V MAX700 ONLY (CTL = VCC, unless otherwise noted) SENSE Input Threshold TA = TMIN to TMAX 1.25 1.29 1.35 V SENSE Input Current 0.1 nA HYST Input On-Resistance 0.5 kΩ CTL Input Threshold 2 CTL Pulldown Current 30 www.maximintegrated.com V 100 µA Maxim Integrated │  3 MAX700/MAX701/MAX702 Power-Supply Monitor with Reset Pin Description PIN NAME MAX700 MAX701 MAX702 1 1 1 MR 2 — — SENSE FUNCTION Input for Manual Pushbutton Reset. Has internal 5µA pullup. Low input activates the RESET/RESET outputs. The voltage-sense input when CTL = VCC. Its threshold is 1.29V. SENSE always remains connected to the internal comparator. So, when VCC is being monitored internally (CTL = GND), SENSE should be left open circuit. 3 — — HYST Normally NOT used when voltage is monitored through VCC (CTL = GND). When monitoring through SENSE (CTL = VCC), HYST allows hysteresis to be added, reducing noise and spurious reset activity (Figure 3). HYST turns on 5µs before the RESET/RESET outputs are activated, and its on-resistance to GND is typically 1kΩ. 4 4 3 GND Ground 5 6 7 RESET Goes low when VCC falls below 4.65V, or when CTL = VCC on the MAX700 goes low when SENSE falls below 1.29V. 6 5 — RESET Inverted Version of RESET 7 — — CTL When CTL = GND, VCC is monitored by the reset circuit. When CTL = VCC, VCC is ignored and SENSE is monitored, allowing the threshold to be set with external resistors. 8 8 2 VCC Chip Power and +5V Sensing Input (When CTL = GND on MAX700) — 2, 3, 7 4, 5, 6, 8 N.C. No Connection www.maximintegrated.com Maxim Integrated │  4 MAX700/MAX701/MAX702 Power-Supply Monitor with Reset 1M MR 1 8 VCC MANUAL RESET BUTTON 7 CTL COMPARATOR SENSE 2 1 150k N.C. MAX700 2 3 1.29VREF R RC 6 RESET 4 R OSC HYST 3 MAX700 MR VCC SENSE CTL HYST RESET GND RESET 8 +5V 7 6 N.C. 5 TO µP 5 RESET GND 4 Figure 1. MAX700 Block Diagram MANUAL RESET BUTTON VIN R1 MAX700 1 MR 2 R2 Figure 2. MAX700 Typical Connection Diagram SENSE VCC CTL 8 VIN 3V TO 15V 7 2V/div RESET R3 3 4 R1 = R2 HYST RESET GND RESET 6 0V N.C. 5 TO µP 2V/div VCC ( 1.29V - 1) V = LOWER VOLTAGE THRESHOLD L 0V L VTR1 R3 = V = UPPER VOLTAGE THRESHOLD VU - VL U 1s/div HYSTERESIS = VU - VL Figure 3. MAX700 Connected for External Senses and Hysteresis Figure 4. Typical MAX700/MAX701/MAX702 RESET Output vs. VCC Figure 4 shows the RESET output of the MAX700/ MAX701/MAX702 in the correct state for VCC voltages down to 0V. Note the effect of the built-in hysteresis on the trigger lever of RESET. Package Information www.maximintegrated.com 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. 8 PDIP P8+2 21-0143 — 8 Narrow SO S8+4 21-0041 90-0096 Maxim Integrated │  5 MAX700/MAX701/MAX702 Power-Supply Monitor with Reset Revision History REVISION NUMBER REVISION DATE PAGES CHANGED 0 3/90 Initial release — 1 11/05 Added lead-free information to the Ordering Information table. 1 2 12/07 Updated Pin Description table. 4 3 5/14 No /V OPNs; removed automotive reference from Applications section 1 DESCRIPTION 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. │  6