MAX6711L/M/R/S/T/Z, MAX6712L/M/R/S/T/Z, MAX6713L/M/R/S/T/Z 4-Pin SC70 Microprocessor Reset Circuits with Manual Reset Input General Description The MAX6711/MAX6712/MAX6713 are microprocessor (P) supervisory circuits used to monitor the power supplies in P and digital systems. They provide excellent circuit reliability and low cost by eliminating external components and adjustments when used with +5.0V, +3.3V, +3.0V, or +2.5V-powered circuits. They also provide a debounced manual reset input. These circuits assert a reset signal whenever the VCC supply voltage declines below a preset threshold or whenever manual reset is asserted. Reset remains asserted for at least 140ms after VCC has risen above the reset threshold or when manual reset is deasserted. Reset thresholds suitable for operation with a variety of supply voltages are available. The MAX6713 has an open-drain output stage, while the MAX6711/MAX6712 have push-pull outputs. The MAX6713's open-drain RESET output requires a pull-up resistor that can be connected to a voltage higher than VCC. The MAX6711/MAX6713 have an active-low reset output, while the MAX6712 has an active-high reset output. The reset comparator is designed to ignore fast transients on VCC, and the outputs are guaranteed to be in the correct logic state for VCC down to 1V. Low supply current makes the MAX6711/MAX6712/ MAX6713 ideal for use in portable equipment. These devices are available in a 4-pin SC70 package. Applications Computers Controllers Intelligent Instruments Critical P and C Power Monitoring Portable/BatteryPowered Equipment Ordering Information PART TEMP RANGE PIN-PACKAGE MAX6711_EXS-T -40C to +125C 4 SC70 MAX6711_EXS-T10 -40C to +125C 4 SC70 MAX6712_EXS-T -40C to +125C 4 SC70 MAX6712_EXS-T10 -40C to +125C 4 SC70 MAX6713_EXS-T -40C to +125C 4 SC70 MAX6713_EXS-T10 -40C to +125C 4 SC70 Note: These parts are offered in 2.5k or 10k reels and must be ordered in 2.5k or 10k increments. Order MAX6711_EXS-T for 2.5k reels and MAX6711_EXS-T10 for 10k reels. Insert the desired suffix letter from the Selector Guide into the blank to complete the part number. Devices are available in both leaded and lead-free packaging. Specify lead-free by replacing "-T" with "+T" when ordering. Pin Configuration VCC TOP VIEW VCC VCC MAX6711 MAX6713 RESET PUSHBUTTON MR SWITCH GND 19-1623; Rev 2; 5/14 Precision Monitoring of 2.5V, 3.0V, 3.3V, and 5.0V Power-Supply Voltages Fully Specified Over Temperature Available in Three Output Configurations Push-Pull RESET Output (MAX6711) Push-Pull RESET Output (MAX6712) Open-Drain RESET Output (MAX6713) 140ms min Power-On-Reset Pulse Width Manual Reset Input 12A Supply Current Guaranteed Reset Valid to VCC = +1V Power-Supply Transient Immunity No External Components 4-Pin SC70 Package Selector Guide appears at end of data sheet. Typical Operating Circuit *MAX6713 ONLY Features RPULL-UP* GND 1 P VCC 3 MR MAX6711 MAX6712 MAX6713 RESET INPUT GND 4 RESET (RESET) 2 ( ) ARE FOR MAX6712. SC70-4 MAX6711L/M/R/S/T/Z, MAX6712L/M/R/S/T/Z, MAX6713L/M/R/S/T/Z 4-Pin SC70 Microprocessor Reset Circuits with Manual Reset Input Absolute Maximum Ratings Terminal Voltage (with respect to GND) VCC........................................................................-0.3V to +6.0V RESET, RESET (push-pull)....................... -0.3V to (VCC + 0.3V) RESET (open drain)..............................................-0.3V to +6.0V MR............................................................. -0.3V to (VCC + 0.3V) Input Current, VCC, MR.......................................................20mA Output Current, RESET, RESET.........................................20mA Rate of Rise, VCC...........................................................100V/s Continuous Power Dissipation (TA = +70C) 4-Pin SC70 (derate 3.1mW/C above +70C)..............245mW Operating Temperature Range.......................... -40C to +125C Storage Temperature Range............................. -65C to +150C Lead Temperature (soldering, 10s).................................. +300C 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 = -40C to +125C, unless otherwise noted. Typical values are at VCC = +5V for L/M versions, VCC = +3.3V for T/S versions, VCC = +3V for R version, VCC = +2.5V for Z version, and TA = +25C.) (Note 1) PARAMETER SYMBOL VCC Range Supply Current ICC CONDITIONS MIN TA = 0C to +70C 1.0 5.5 TA = -40C to +105C 1.2 5.5 VCC < 5.5V, MAX671_L/M 16 35 +85C VCC < 3.6V, MAX671_R/S/T/Z 12 30 TA = +85C to VCC < 5.5V, MAX671_L/M +105C VCC < 3.6V, MAX671_R/S/T/Z MAX671_M MAX671_T VTH MAX671_S MAX671_R MAX671_Z 75 Reset Active Timeout Period www.maximintegrated.com UNITS V A 75 TA = +25C 4.56 TA = -40C to +85C 4.50 4.75 TA = +85C to +105C 4.40 4.86 TA = +25C 4.31 TA = -40C to +85C 4.25 4.50 TA = +85C to +105C 4.16 4.56 TA = +25C 3.04 TA = -40C to +85C 3.00 3.15 TA = +85C to +105C 2.92 3.23 TA = +25C 2.89 TA = -40C to +85C 2.85 TA = +85C to +105C 2.78 TA = +25C 2.59 TA = -40C to +85C 2.55 TA = +85C to +105C 2.50 TA = +25C 2.28 TA = -40C to +85C 2.25 2.38 TA = +85C to +105C 2.21 2.45 Reset-Threshold Tempco VCC to Reset Delay (Note 2) MAX TA = -40C to MAX671_L Reset Threshold TYP 4.63 4.38 3.08 2.93 4.70 4.45 3.11 2.96 3.00 3.08 2.63 2.66 2.70 2.76 2.32 2.35 30 VCC = VTH to (VTH - 100 mV) ppm/C 20 TA = -40C to +85C 140 TA = +85C to +125C 100 V 240 s 460 840 ms Maxim Integrated 2 MAX6711L/M/R/S/T/Z, MAX6712L/M/R/S/T/Z, MAX6713L/M/R/S/T/Z 4-Pin SC70 Microprocessor Reset Circuits with Manual Reset Input Electrical Characteristics (continued) (VCC = full range, TA = -40C to +125C, unless otherwise noted. Typical values are at VCC = +5V for L/M versions, VCC = +3.3V for T/S versions, VCC = +3V for R version, VCC = +2.5V for Z version, and TA = +25C.) (Note 1) PARAMETER SYMBOL CONDITIONS MIN TYP VCC = VTH min, ISINK = 1.2mA, RESET Output-Voltage Low (MAX6711/MAX6713) VOL 0.4 MAX6711L/M, MAX6713L/M VCC > 1.0V, ISINK = 50A RESET Output-Voltage High (MAX6711) RESET Output-Voltage Low (MAX6712) RESET Output-Voltage High (MAX6712) VOH VOL MAX6711L/M VCC = VTH max, ISINK = 1.2mA, VOH 0.8 x VCC V VCC x 1.5 0.3 MAX6712R/S/T/Z 1.8V < VCC < VTH min, ISOURCE = 150A V 0.4 0.8 x VCC 1 0.3 x VCC VIH 0.7 x VCC MR Pull-Up Resistance 10 MR Minimum Pulse Width 1 MR Glitch Immunity MR to Reset Delay Note 1: Production testing done at TA = +25C; limits over temperature guaranteed by design only. Note 2: RESET output for MAX6711/MAX6713; RESET output for MAX6712. www.maximintegrated.com V VCC > VTH, RESET deasserted VIL V 0.3 VCC = VTH max, ISINK = 3.2mA, MAX6712L/M RESET Open-Drain OutputLeakage Current MR Input Threshold MAX6711R/S/T/Z VCC > VTH max, ISOURCE = 800A, UNITS 0.3 MAX6711R/S/T/Z, MAX6713R/S/T/Z VCC = VTH min, ISINK = 3.2mA, VCC > VTH max, ISOURCE = 500A, MAX 20 A V kW s 100 ns 200 ns Maxim Integrated 3 MAX6711L/M/R/S/T/Z, MAX6712L/M/R/S/T/Z, MAX6713L/M/R/S/T/Z 4-Pin SC70 Microprocessor Reset Circuits with Manual Reset Input Typical Operating Characteristics (VCC = full range, TA = -40C to +125C, unless otherwise noted. Typical values are at VCC = +5V for L/M versions, VCC = +3.3V for T/S versions, VCC = +3V for R version, VCC = +2.5V for Z version, and TA = +25C.) 5 MAX671 _L/M/R/S/T/Z, VCC = 1V 0 20 40 60 80 40 20 VOD = 100mV 100 120 0 MAX6711/12/13-TOC4 POWER-UP RESET TIMEOUT (ms) 40 60 80 MAX671_ R/S/T/Z 250 225 60 VOD = 100mV 30 0 -40 -20 100 120 POWER-UP RESET TIMEOUT vs. TEMPERATURE 275 200 20 VOD = 20mV 90 VOD = 200mV 0 TEMPERATURE (C) TEMPERATURE (C) 300 120 VOD = 200mV 0 -40 -20 VOD = 10mV 150 1.001 20 40 60 80 TEMPERATURE (C) 100 120 RESET THRESHOLD vs. TEMPERATURE MAX6711/12/13-TOC5 -40 -20 VOD = 20mV RESET THRESHOLD (V) 0 60 POWER-DOWN RESET DELAY (s) MAX671 _Z, VCC = 2.5V MAX671 _R/S/T, VCC = 3.3V VOD = 10mV MAX671_L/M POWER-DOWN RESET DELAY vs. TEMPERATURE 180 MAX6711/12/13-TOC2 POWER-DOWN RESET DELAY (s) MAX671_L/M, VCC = 5V 10 80 MAX6711/12/13 toc01 SUPPLY CURRENT (A) 15 MAX671_R/S/T/Z POWER-DOWN RESET DELAY vs. TEMPERATURE MAX6711/12/13-TOC3 SUPPLY CURRENT vs. TEMPERATURE (NO LOAD) VTH = 4.63V 1.000 0.999 MAX671_ L/M -40 -20 0 20 40 60 80 TEMPERATURE (C) www.maximintegrated.com 100 120 0.998 -40 -20 0 20 40 60 80 100 120 TEMPERATURE (C) Maxim Integrated 4 MAX6711L/M/R/S/T/Z, MAX6712L/M/R/S/T/Z, MAX6713L/M/R/S/T/Z 4-Pin SC70 Microprocessor Reset Circuits with Manual Reset Input Pin Description PIN NAME 1 GND FUNCTION VCC Ground RESET output remains low while VCC is below the reset threshold, and for at least 140ms after V CC rises above the reset threshold. RESET (MAX6711/ MAX6713) MAX6711 RESET MR GND 2 RESET output remains high while VCC is below the reset threshold, and for at least 140ms after VCC rises above the reset threshold. RESET (MAX6712) 3 4 Manual Reset Input. RESET (RESET) remains asserted as long as MR is low, and for at least 140ms after MR is deasserted. This active-low input has an internal 20kW(typ) pull-up resistor. MR It can be driven from a TTL- or CMOS- logic line, or shorted to ground with a switch. Leave open or connect to VCC if unused. Supply Voltage (+5.0V, +3.3V, +3.0V, or +2.5V) VCC MAXIMUM TRANSIENT DURATION (s) 400 TA = +25C 320 240 160 MAX671_L/M 80 MAX671_R/S/T/Z 0 1 10 100 1000 RESET COMPARATOR OVERDRIVE, VTH - VCC (mV) Figure 1. Maximum Transient Duration Without Causing a Reset Pulse vs. Reset Comparator Overdrive Detailed Description Reset Output A microprocessor's (P's) reset input starts the P in a known state. The MAX6711/MAX6712/MAX6713 assert reset to prevent code-execution errors during powerup, power-down, or brownout conditions. They assert a reset signal whenever the VCC supply voltage declines below a preset threshold, keeping it asserted for at www.maximintegrated.com R1 100k Figure 2. RESET Valid to VCC = Ground Circuit least 140ms after VCC has risen above the reset threshold. The MAX6713 uses an open-drain output, and the MAX6711/MAX6712 have a push-pull output stage. Connect a pull-up resistor on the MAX6713's RESET output to any supply between 0 and 6V. Manual Reset Input Many P-based systems require manual reset capability, allowing the operator, a test technician, or external logic circuitry to initiate a reset. Reset remains asserted while MR is low, and for at least 140ms after MR returns high. This input has an internal 20k pullup resistor, so it can be left open if it is not used. MR can be driven with TTL- or CMOS-logic levels, or with open-drain/collector outputs. To create a manual reset function, connect a normally open momentary switch from MR to ground; external debounce circuitry is not required. If MR is driven from long cables or if the device is used in a noisy environment, connecting a 0.1F capacitor from MR to ground provides additional noise immunity. Applications Information Negative-Going VCC Transients In addition to issuing a reset to the P during power-up, power-down, and brownout conditions, the MAX6711/ MAX6712/MAX6713 are relatively immune to short-duration negative-going VCC transients (glitches). Figure 1 shows typical transient duration vs. reset comparator overdrive, for which the MAX6711/MAX6712/ MAX6713 do not generate a reset pulse. The graph was generated using a negative-going pulse applied to VCC, starting 0.5V above the actual reset threshold and ending below it by the magnitude indicated (reset comparator overdrive). The graph indicates the maximum pulse width a negative-going VCC transient can have without causing a reset pulse. As the magnitude of the transient increases (goes farther below the reset threshold), the Maxim Integrated 5 MAX6711L/M/R/S/T/Z, MAX6712L/M/R/S/T/Z, MAX6713L/M/R/S/T/Z 4-Pin SC70 Microprocessor Reset Circuits with Manual Reset Input +5.0V +3.3V VCC VCC VCC P MAX6713 RESET MOTOROLA RESET 68HCXX INPUT VCC VCC RPULLUP MAX6713 RESET 5V SYSTEM RESET INPUT MR GND GND GND GND Figure 3. Interfacing to Ps with Bidirectional Reset I/O Figure 4. MAX6713 Open-Drain RESET Output Allows Use with Multiple Supplies maximum allowable pulse width decreases. Typically, for the MAX671_L and MAX671_M, a VCC transient that goes 100mV below the reset threshold and lasts 20s or less will not cause a reset pulse. A 0.1F bypass capacitor mounted as close as possible to the VCC pin provides additional transient immunity. MAX6713 Open-Drain RESET Output Allows Use with Multiple Supplies Ensuring a Valid Reset Output Down to VCC = 0 When VCC falls below 1V, the MAX6711 RESET output no longer sinks current--it becomes an open circuit. Therefore, high-impedance CMOS-logic inputs connected to RESET can drift to undetermined voltages. This presents no problem in most applications since most P and other circuitry is inoperative with VCC below 1V. However, in applications where RESET must be valid down to 0, adding a pull-down resistor to RESET causes any stray leakage currents to flow to ground, holding RESET low (Figure 2). R1's value is not critical; 100k is large enough not to load RESET and small enough to pull RESET to ground. A 100k pull-up resistor to VCC is also recommended for the MAX6712 if RESET is required to remain valid for VCC < 1V.66 Interfacing to Ps with Bidirectional Reset Pins Since the RESET output on the MAX6713 is opendrain, this device interfaces easily with Ps that have bidirectional reset pins, such as the Motorola 68HC11. Connecting the P supervisor's RESET output directly to the P's RESET pin with a single pull-up resistor allows either device to assert reset (Figure 3). www.maximintegrated.com Generally, the pull-up connected to the MAX6713 will connect to the supply voltage that is being monitored at the IC's VCC pin. However, some systems may use the open-drain output to level-shift from the monitored supply to reset circuitry powered by some other supply (Figure 4). Note that as the MAX6713's VCC decreases below 1V, so does the IC's ability to sink current at RESET. Also, with any pullup, RESET will be pulled high as VCC decays toward 0. The voltage where this occurs depends on the pull-up resistor value and the voltage to which it is connected. Benefits of Highly Accurate Reset Threshold Most P supervisor ICs have reset threshold voltages between 5% and 10% below the value of nominal supply voltages. This ensures a reset will not occur within 5% of the nominal supply, but will occur when the supply is 10% below nominal. When using ICs rated at only the nominal supply 5%, a zone of uncertainty where the supply is between 5% and 10% low, and where the reset may or may not be asserted is left. The MAX671_L/T/Z use highly accurate circuitry to ensure that reset is asserted close to the 5% limit, and long before the supply has declined to 10% below nominal. Chip Information TRANSISTOR COUNT: 380 Maxim Integrated 6 MAX6711L/M/R/S/T/Z, MAX6712L/M/R/S/T/Z, MAX6713L/M/R/S/T/Z 4-Pin SC70 Microprocessor Reset Circuits with Manual Reset Input Selector Guide PART/SUFFIX RESET THRESHOLD (V) OUTPUT TYPE TOP MARK MAX6711L 4.63 Push-Pull RESET AAB MAX6711M 4.38 Push-Pull RESET AAC MAX6711T 3.08 Push-Pull RESET AAD MAX6711S 2.93 Push-Pull RESET AAE MAX6711R 2.63 Push-Pull RESET AAF MAX6711Z 2.32 Push-Pull RESET AAG MAX6712L 4.63 Push-Pull RESET AAH MAX6712M 4.38 Push-Pull RESET AAI MAX6712T 3.08 Push-Pull RESET AAJ MAX6712S 2.93 Push-Pull RESET AAK MAX6712R 2.63 Push-Pull RESET AAL MAX6712Z 2.32 Push-Pull RESET AAM MAX6713L 4.63 Open-Drain RESET AAN MAX6713M 4.38 Open-Drain RESET AAO MAX6713T 3.08 Open-Drain RESET AAP MAX6713S 2.93 Open-Drain RESET AAQ MAX6713R 2.63 Open-Drain RESET AAR MAX6713Z 2.32 Open-Drain RESET AAS 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. 4 SC70 X4-1 21-0098 90-0187 www.maximintegrated.com Maxim Integrated 7 MAX6711L/M/R/S/T/Z, MAX6712L/M/R/S/T/Z, MAX6713L/M/R/S/T/Z 4-Pin SC70 Microprocessor Reset Circuits with Manual Reset Input Revision History REVISION NUMBER REVISION DATE 2 5/14 PAGES CHANGED DESCRIPTION No /V OPNs; removed automotive reference from Applications section 1 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. 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