MAX16000

19-3870; Rev 3; 12/08 Low-Voltage, Quad-/Hex-/Octal-Voltage µP Supervisors General Description The MAX16000–MAX16007 are low-voltage, quad-/hex-/ octal-voltage µP supervisors in small thin QFN and TSSOP packages. These devices provide supervisory functions for complex multivoltage systems. The MAX16000/ MAX16001/MAX16002 monitor four voltages, the MAX16003/MAX16004/MAX16005 monitor six voltages, and the MAX16006/MAX16007 monitor eight voltages. The MAX16000/MAX16001/MAX16003/MAX16004/ MAX16006 offer independent outputs for each monitored voltage. The MAX16001/MAX16002/MAX16004– MAX16007 offer a reset output that asserts whenever any of the monitored voltages fall below their respective thresholds or the manual reset input is asserted. The reset output remains asserted for the reset timeout after all voltages are above their respective thresholds and the manual reset input is deasserted. The minimum reset timeout is internally set to 140ms or can be adjusted with an external capacitor. All open-drain outputs have internal 30µA pullups that eliminate the need for external pullup resistors. However, each output can be driven with an external voltage up to 5.5V. Other features offered include a manual reset input, a tolerance pin for selecting 5% or 10% input thresholds, and a margin enable function for deasserting the outputs during margin testing. The MAX16001/MAX16002/MAX16004–MAX16007 offer a watchdog timer that asserts RESET or an independent watchdog output (MAX16005) when the watchdog timeout period (1.6s typ) is exceeded. The watchdog timer can be disabled by floating the input. These devices are offered in 12-, 16-, 20-, and 24-lead thin QFN and 16-lead TSSOP packages. These are fully specified from -40°C to +125°C. Features o Fixed Thresholds for 5V, 3.3V, 3V, 2.5V, 1.8V, 1.5V, 1.2V, and 0.9V Systems o Adjustable Thresholds Monitor Voltages Down to 0.4V o Open-Drain Outputs with Internal Pullups Reduce the Number of External Components o Fixed 140ms (min) or Capacitor-Adjustable Reset Timeout o Manual Reset, Margin Enable, and Tolerance Select Inputs o Watchdog Timer 1.6s (typ) Timeout Period 54s Startup Delay After Reset (Except MAX16005) o Independent Watchdog Output (MAX16005) o RESET Output Indicates All Voltages Present o Independent Voltage Monitors o Guaranteed Correct Logic State Down to VCC = 1V o Small (4mm x 4mm) Thin QFN Package o TSSOP (5mm x 4.4mm) Package (MAX16005) MAX16000–MAX16007 Ordering Information PART MAX16000_TC+ TEMP RANGE -40°C to +125°C PIN-PACKAGE 12 TQFN-EP* Note: The “_” is a placeholder for the input voltage threshold. See Table 1. +Denotes lead(Pb)-free/RoHS-compliant package. For tape-and-reel, add a “T” after the “+.” Tape-and-reel are offered in 2.5k increments. *EP = Exposed pad. Ordering Information continued at end of data sheet. Typical Operating Circuit Applications Storage Equipment Servers Networking/Telecommunication Equipment Multivoltage ASICs VCC VIN1 VIN2 VIN3 VIN4 VIN5 VIN6 IN1 IN2 IN3 IN4 IN5 IN6 MR MAX16005 RESET WDI WDO RST I/O NMI µP SRT MARGIN Selector Guide appears at end of data sheet. GND TOL ________________________________________________________________ Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. Low-Voltage, Quad-/Hex-/Octal-Voltage µP Supervisors MAX16000–MAX16007 ABSOLUTE MAXIMUM RATINGS VCC, OUT_, IN_, RESET, WDO to GND....................-0.3V to +6V TOL, MARGIN, MR, SRT, WDI, to GND ..........-0.3V to VCC + 0.3 Input/Output Current (RESET, MARGIN, SRT, MR, TOL, OUT_, WDO, WDI) ..............................±20mA Continuous Power Dissipation (TA = +70°C) 12-Pin TQFN (derate 16.9mW/°C above +70°C) ........1349mW 16-Pin TQFN (derate 16.9mW/°C above +70°C) ........1349mW 20-Pin TQFN (derate 16.9mW/°C above +70°C) ........1355mW 24-Pin TQFN (derate 16.9mW/°C above +70°C) ........1666mW 16-Pin TSSOP (derate 9.4mW/°C above +70°C) ..........754mW Operating Temperature Range .........................-40°C to +125°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 = 2.0V to 5.5V, TA = -40°C to +125°C, unless otherwise specified. Typical values are at VCC = 3.3V, TA = +25°C.) (Note 1) PARAMETER Operating Voltage Range Supply Current UVLO (Undervoltage Lockout) IN_ (See Table 1) 5V threshold, TOL = GND 5V threshold, TOL = VCC 3.3V threshold, TOL = GND 3.3V threshold, TOL = VCC 3.0V threshold, TOL = GND 3.0V threshold, TOL = VCC 2.5V threshold, TOL = GND Threshold Voltages (IN_ Falling) VTH 2.5V threshold, TOL = VCC 1.8V threshold, TOL = GND 1.8V threshold, TOL = VCC 1.5V threshold, TOL = GND 1.5V threshold, TOL = VCC 1.2V threshold, TOL = GND 1.2V threshold, TOL = VCC 0.9V threshold, TOL = GND 0.9V threshold, TOL = VCC 4.50 4.25 2.970 2.805 2.70 2.55 2.250 2.125 1.62 1.53 1.350 1.275 1.08 1.02 0.810 0.765 4.625 4.375 3.053 2.888 2.775 2.625 2.313 2.188 1.665 1.575 1.388 1.313 1.11 1.05 0.833 0.788 4.75 4.50 3.135 2.970 2.85 2.70 2.375 2.250 1.71 1.62 1.425 1.350 1.14 1.08 0.855 0.810 V SYMBOL VCC ICC VUVLO (Note 2) VCC = 3.3V, OUT_, RESET not asserted (Note 3) VCC = 5V, OUT_, RESET not asserted VCC rising 1.62 CONDITIONS MIN 1.0 45 50 1.8 TYP MAX 5.5 65 70 1.98 V UNITS V µA 2 _______________________________________________________________________________________ Low-Voltage, Quad-/Hex-/Octal-Voltage µP Supervisors ELECTRICAL CHARACTERISTICS (continued) (VCC = 2.0V to 5.5V, TA = -40°C to +125°C, unless otherwise specified. Typical values are at VCC = 3.3V, TA = +25°C.) (Note 1) PARAMETER Adjustable Threshold (IN_ Falling) IN_ Hysteresis IN_ Input Current RESET SRT = VCC Reset Timeout tRP CSRT = 1500pF (Note 4) CSRT = 100pF CSRT = open SRT Ramp Current SRT Threshold SRT Hysteresis IN_ to Reset Delay RESET Output-Voltage Low tRD VOL IN_ falling VCC = 3.3V, ISINK = 10mA, RESET asserted VCC = 2.5V, ISINK = 6mA, RESET asserted VCC = 1.2V, ISINK = 50µA, RESET asserted RESET Output-Voltage High MR Input-Voltage Low MR Input-Voltage High MR Minimum Pulse Width MR Glitch Rejection MR to Reset Delay MR Pullup Resistance OUTPUTS (OUT_ ) OUT_ Output-Voltage Low OUT_ Output-Voltage High IN_ to OUT_ Propagation Delay VOL VOH tD VCC = 3.3V, ISINK = 2mA VCC = 2.5V, ISINK = 1.2mA VCC ≥ 2.0V, ISOURCE = 6µA (VTH + 100mV) to (VTH - 100mV) 0.8 x VCC 20 0.30 0.30 V V µs Pulled up to VCC 12 VOH VIL VIH 0.7 x VCC 1 100 200 20 28 VCC ≥ 2.0V, ISOURCE = 6µA, RESET deasserted 0.8 x VCC 0.3 x VCC ISRT VSRT = 0V 460 1.173 140 2.43 200 3.09 0.206 50 600 1.235 100 20 0.30 0.30 0.30 V V V µs ns ns kΩ V 740 1.293 µs nA V mV µs 280 3.92 ms SYMBOL VTH VTH_HYS TOL = GND TOL = VCC IN_ rising Fixed thresholds Adjustable thresholds -100 CONDITIONS MIN 0.388 0.366 TYP 0.394 0.372 0.5 3 16 +100 MAX 0.400 0.378 UNITS V % VTH µA nA MAX16000–MAX16007 _______________________________________________________________________________________ 3 Low-Voltage, Quad-/Hex-/Octal-Voltage µP Supervisors MAX16000–MAX16007 ELECTRICAL CHARACTERISTICS (continued) (VCC = 2.0V to 5.5V, TA = -40°C to +125°C, unless otherwise specified. Typical values are at VCC = 3.3V, TA = +25°C). (Note 1) PARAMETER Reference Short-Circuit Current Reference Output Accuracy Line Regulation Reference Load Regulation Sourcing, 0 ≤ IREF ≤ 40µA WATCHDOG TIMER (MAX16001/MAX16002/MAX16004–MAX16007) WDI Input-Voltage Low WDI Input-Voltage High WDI Pulse Width Watchdog Timeout Period Watchdog Startup Period Watchdog Input Current WDO Output-Voltage Low (MAX16005 Only) WDO Output-Voltage High (MAX16005 Only) DIGITAL LOGIC TOL Input-Voltage Low TOL Input-Voltage High TOL Input Current MARGIN Input-Voltage Low MARGIN Input-Voltage High MARGIN Pullup Resistance MARGIN Delay Time tMD VIL VIH Pulled up to VCC Rising or falling (Note 6) 0.7 x VCC 12 20 50 28 VIL VIH TOL = VCC 0.7 x VCC 100 0.3 x VCC 0.3 x VCC V V nA V V kΩ µs VOL VOH tWDI MAX16001/2/4/6/7 VWDI = 0 to VCC (Note 5) VCC = 3.3V, ISINK = 2mA VCC = 2.5V, ISINK = 1.2mA VCC ≥ 2.0V, ISOURCE = 6µA, WDO deasserted 0.8 x VCC VIL VIH (Note 5) 0.7 x VCC 50 1.12 35 -1 1.6 54 2.40 72 +1 0.30 0.30 0.3 x VCC V V ns s s µA V V VREF SYMBOL CONDITIONS Shorted to GND No load 1.200 MIN TYP 0.8 1.235 0.005 10 1.270 MAX UNITS mA V %/V Ω REFERENCE OUTPUT (MAX16005 Only) Note 1: Devices are tested at TA = +25°C and guaranteed by design for TA = TMIN to TMAX. Note 2: The outputs are guaranteed to be in the correct logic state down to VCC = 1V. Note 3: Measured with WDI, MARGIN, and MR unconnected. Note 4: The minimum and maximum specifications for this parameter are guaranteed by using the worst case of the SRT ramp current and SRT threshold specifications. Note 5: Guaranteed by design and not production tested. Note 6: Amount of time required for logic to lock/unlock outputs from margin testing. 4 _______________________________________________________________________________________ Low-Voltage, Quad-/Hex-/Octal-Voltage µP Supervisors Typical Operating Characteristics (VCC = 3.3V, TA = +25°C, unless otherwise noted.) NORMALIZED NORMALIZED THRESHOLD vs. SUPPLY VOLTAGE MAX16000 toc02 MAX16000–MAX16007 SUPPLY CURRENT vs. SUPPLY VOLTAGE MAX16000 toc01 SUPPLY CURRENT vs. TEMPERATURE 60 WDI, MARGIN, AND MR UNCONNECTED 55 SUPPLY CURRENT (µA) 50 45 40 VCC = 2.5V 35 30 VCC = 3.3V VCC = 5V 1.010 1.008 NORMALIZED THRESHOLD 1.005 1.003 1.000 0.998 0.995 0.993 0.990 -40 -25 -10 5 20 35 50 65 80 95 110 125 TEMPERATURE (°C) 1.5 2.0 WDI, MARGIN, AND MR UNCONNECTED 55 SUPPLY CURRENT (µA) 50 45 40 35 30 1.5 2.0 2.5 3.0 3.5 4.0 4.5 SUPPLY VOLTAGE (V) 5.0 5.5 2.5 3.0 3.5 4.0 4.5 SUPPLY VOLTAGE (V) 5.0 5.5 NORMALIZED THRESHOLD vs. TEMPERATURE MAX16000 toc04 OUTPUT VOLTAGE vs. SINK CURRENT 100 MAX16000 toc05 OUTPUT VOLTAGE vs. SOURCE CURRENT MAX16000 toc06 1.001 1.000 NORMALIZED THRESHOLD 0.999 0.998 0.997 1000 800 VCC - VOUT_ (mV) 75 VOUT_ (mV) 600 50 400 25 0.996 OUT_ LOW 0.995 -40 -25 -10 5 20 35 50 65 80 95 110 125 TEMPERATURE (°C) 0 0 1 2 3 4 5 6 SINK CURRENT (mA) 7 8 200 OUT_ HIGH 0 0 5 10 15 20 SOURCE CURRENT (µA) 25 30 MAXIMUM TRANSIENT DURATION vs. INPUT OVERDRIVE MAXIMUM TRANSIENT DURATION (µs) OUTPUT GOES LOW ABOVE THIS LINE MAX16000 toc07 RESET TIMEOUT PERIOD vs. TEMPERATURE 197 RESET TIMEOUT PERIOD (ms) 196 195 194 193 192 191 190 MAX16000 toc08 RESET TIMEOUT DELAY MAX16000 toc09 600 500 400 300 200 100 0 1 10 100 198 MAX16000 toc03 60 IN1 5V/div OUT1 2V/div RESET 2V/div SRT = VCC -40 -25 -10 5 20 35 50 65 80 95 110 125 TEMPERATURE (°C) 40ms/div 1000 INPUT OVERDRIVE (mV) _______________________________________________________________________________________ 5 Low-Voltage, Quad-/Hex-/Octal-Voltage µP Supervisors MAX16000–MAX16007 Typical Operating Characteristics (continued) (VCC = 3.3V, TA = +25°C, unless otherwise noted.) RESET TIMEOUT PERIOD vs. CSRT MAX16000 toc10 WATCHDOG TIMEOUT PERIOD vs. TEMPERATURE 1.59 WATCHDOG TIMEOUT PERIOD (s) 1.58 1.57 1.56 1.55 1.54 1.53 1.52 1.51 MAX16000 toc11 MARGIN ENABLE FUNCTION MAX16000 toc12 1000 1.60 100 MARGIN 2V/div tRP (ms) 10 1 OUT_ 2V/div 0.1 0.01 0.01 0.1 1 10 100 1000 CSRT (nF) OUT_ AND RESET ARE BELOW RESPECTIVE THRESHOLDS -40 -25 -10 5 20 35 50 65 80 95 110 125 TEMPERATURE (°C) 100µs/div RESET 2V/div 1.50 MARGIN DISABLE FUNCTION MAX16000 toc13 REFERENCE VOLTAGE vs. SOURCE CURRENT MAX16005 MARGIN 2V/div 1.255 1.250 1.245 OUT_ 2V/div RESET 2V/div VREF (V) 1.240 1.235 1.230 1.225 1.220 0 100 200 300 400 500 SOURCE CURRENT (µA) 600 MAX16000 toc14 MAX16000 toc16 1.260 OUT_ AND RESET ARE BELOW RESPECTIVE THRESHOLDS 100µs/div REFERENCE VOLTAGE vs. SUPPLY VOLTAGE MAX16000 toc15 REFERENCE VOLTAGE vs. TEMPERATURE 1.28 MAX16005 1.27 REFERENCE VOLTAGE (V) 1.26 1.25 1.24 1.23 1.22 1.21 1.20 1.260 MAX16005 1.255 REFERENCE VOLTAGE (V) 1.250 1.245 1.240 1.235 1.230 1.225 1.220 1.5 2.0 2.5 3.0 3.5 4.0 4.5 SUPPLY VOLTAGE (V) 5.0 5.5 -40 -25 -10 5 20 35 50 65 80 95 110 125 TEMPERATURE (°C) 6 _______________________________________________________________________________________ Low-Voltage, Quad-/Hex-/Octal-Voltage µP Supervisors Pin Description (MAX16000/MAX16001/MAX16002) PIN MAX16000 MAX16001 MAX16002 NAME FUNCTION MAX16000–MAX16007 1 2 3 4 5 6 7 8 9 10 11 12 1 2 4 5 6 7 10 11 12 14 15 16 1 2 4 5 — — 8 — — 10 11 12 IN3 IN4 GND VCC OUT3 OUT4 MARGIN OUT2 OUT1 IN1 IN2 TOL Monitored Input Voltage 3. See Table 1 for the input voltage threshold. Monitored Input Voltage 4. See Table 1 for the input voltage threshold. Ground Unmonitored Power-Supply Input Output 3. When the voltage at IN3 falls below its threshold, OUT3 goes low and stays low until the voltage at IN3 exceeds its threshold. The open-drain output has a 30µA internal pullup to V CC . Output 4. When the voltage at IN4 falls below its threshold, OUT4 goes low and stays low until the voltage at IN4 exceeds its threshold. The open-drain output has a 30µA internal pullup to VCC. Active-Low Manual Deassert Input. Pull MARGIN low to deassert all outputs (go into high state), regardless of the voltage at any monitored input. Output 2. When the voltage at IN2 falls below its threshold, OUT2 goes low and stays low until the voltage at IN2 exceeds its threshold. The open-drain output has a 30µA internal pullup to VCC. Output 1. When the voltage at IN1 falls below its threshold, OUT1 goes low and stays low until the voltage at IN1 exceeds its threshold. The open-drain output has a 30µA internal pullup to VCC. Monitored Input Voltage 1. See Table 1 for the input voltage threshold. Monitored Input Voltage 2. See Table 1 for the input voltage threshold. Threshold Tolerance Input. Connect TOL to GND to select 5% threshold tolerance. Connect TOL to VCC to select 10% threshold tolerance. Watchdog Timer Input. If WDI remains low or high for longer than the watchdog timeout period, RESET is asserted. The timer clears whenever a reset is asserted or a rising or falling edge on WDI is detected. The watchdog timer enters a startup period that allows 54s for the first transition to occur before a reset. Leave WDI unconnected to disable the watchdog timer. The WDI floating-state detector uses a small 400nA current. Therefore, do not connect WDI to anything that will source or sink more than 200nA. Note that the leakage current specification for most three-state drivers exceeds 200nA. Active-Low Manual Reset Input. Pull MR low to assert RESET low. RESET remains low for the reset timeout period after MR is deasserted. MR is pulled up to VCC through a 20kΩ resistor. Set Reset Timeout Input. Connect a capacitor from SRT to GND to set the reset timeout period. The reset timeout period can be calculated as follows: Reset Timeout (s) = 2.06 x 106 (Ω) x CSRT (F). For the internal timeout period of 140ms (min), connect SRT to VCC. Active-Low Reset Output. RESET asserts low when any of the monitored voltages falls below its respective threshold or MR is asserted. RESET remains asserted for the reset timeout period after all monitored voltages exceed their respective thresholds and MR is deasserted. This open-drain output has a 30µA internal pullup. Exposed Pad. EP is internally connected to GND. Connect EP to the ground plane to provide a low thermal resistance path from the IC junction to the PCB. Do not use as the electrical connection to GND. — 3 3 WDI — 8 6 MR — 9 7 SRT — 13 9 RESET — — — EP _______________________________________________________________________________________ 7 Low-Voltage, Quad-/Hex-/Octal-Voltage µP Supervisors MAX16000–MAX16007 Pin Description (MAX16003/MAX16004/MAX16005) PIN MAX16005 TSSOP MAX16003 MAX16004 MAX16005 TQFN NAME FUNCTION 1 2 3 4 5 6 1 2 3 5 6 7 3 4 5 7 8 — 1 2 3 5 6 — IN4 IN5 IN6 GND VCC OUT4 Monitored Input Voltage 4. See Table 1 for the input voltage threshold. Monitored Input Voltage 5. See Table 1 for the input voltage threshold. Monitored Input Voltage 6. See Table 1 for the input voltage threshold. Ground Unmonitored Power-Supply Input Output 4. When the voltage at IN4 falls below its threshold, OUT4 goes low and stays low until the voltage at IN4 exceeds its threshold. The open-drain output has a 30µA internal pullup to VCC. Output 5. When the voltage at IN5 falls below its threshold, OUT5 goes low and stays low until the voltage at IN5 exceeds its threshold. The open-drain output has a 30µA internal pullup to VCC. Output 6. When the voltage at IN6 falls below its threshold, OUT6 goes low and stays low until the voltage at IN6 exceeds its threshold. The open-drain output has a 30µA internal pullup to VCC. Manual Deassert Input. Pull MARGIN low to deassert all outputs (go into high state), regardless of the voltage at any monitored input. Output 3. When the voltage at IN3 falls below its threshold, OUT3 goes low and stays low until the voltage at IN3 exceeds its threshold. The open-drain output has a 30µA internal pullup to VCC. Output 2. When the voltage at IN2 falls below its threshold, OUT2 goes low and stays low until the voltage at IN2 exceeds its threshold. The open-drain output has a 30µA internal pullup to VCC. Output 1. When the voltage at IN1 falls below its threshold, OUT1 goes low and stays low until the voltage at IN1 exceeds its threshold. The open-drain output has a 30µA internal pullup to VCC. Monitored Input Voltage 1. See Table 1 for the input voltage threshold. Monitored Input Voltage 2. See Table 1 for the input voltage threshold. Monitored Input Voltage 3. See Table 1 for the input voltage threshold. 7 8 — — OUT5 8 9 — — OUT6 9 12 13 11 MARGIN 10 13 — — OUT3 11 14 — — OUT2 12 13 14 15 15 17 18 19 — 15 16 1 — 13 14 15 OUT1 IN1 IN2 IN3 8 _______________________________________________________________________________________ Low-Voltage, Quad-/Hex-/Octal-Voltage µP Supervisors Pin Description (MAX16003/MAX16004/MAX16005) (continued) PIN MAX16005 TSSOP MAX16003 MAX16004 MAX16005 TQFN NAME FUNCTION MAX16000–MAX16007 16 20 2 16 TOL Threshold Tolerance Input. Connect TOL to GND to select 5% threshold tolerance. Connect TOL to VCC to select 10% threshold tolerance. Watchdog Timer Input. MAX16004: If WDI remains low or high for longer than the watchdog timeout period, RESET is asserted and the timer is cleared. The timer also clears whenever a reset is asserted or a rising or falling edge on WDI is detected. The watchdog timer enters a startup period that allows 54s for the first transition to occur before a reset. Leave WDI unconnected to disable the watchdog timer. MAX16005: If WDI remains low or high for longer than the watchdog timeout period, WDO is asserted. The timer clears whenever a rising or falling edge on WDI is detected. Leave WDI unconnected to disable the watchdog timer. The MAX16005 does not have a startup period. MAX16004/MAX16005: The WDI floating-state detector uses a small 100nA current. Therefore, do not connect WDI to anything that will source or sink more than 50nA. Note that the leakage current specification for most three-state drivers exceeds 50nA. Active-Low Manual Reset Input. Pull MR low to assert RESET low. RESET remains low for the reset timeout period after MR is deasserted. MR is pulled up to VCC through a 20kΩ resistor. Set Reset Timeout Input. Connect a capacitor from SRT to GND to set the reset timeout period. The reset timeout period can be calculated as follows: Reset Timeout (s) = 2.06 x 106 (Ω) x CSRT (F). For the internal timeout period of 140ms (min), connect SRT to VCC. Active-Low Reset Output. RESET asserts low when any of the monitored voltages falls below its respective threshold or MR is asserted. RESET remains asserted for the reset timeout period after all monitored voltages exceed their respective thresholds and MR is deasserted. This open-drain output has a 30µA internal pullup. Reference Output. The reference output voltage of 1.23V can source up to 40µA. Active-Low Watchdog Output. WDO asserts and stays low whenever any of the IN_ inputs fall below their respective thresholds. WDO deasserts without a timeout delay when all the IN_ inputs rise above their thresholds. When all the IN_ inputs rise above their thresholds, WDO asserts low whenever the watchdog timer times out. WDO deasserts after a valid WDI transition or if MR is pulled low. The watchdog timer begins counting after the reset timeout period once MR goes high. Pull MARGIN low to deassert WDO. Exposed Pad. EP is internally connected to GND. Connect EP to the ground plane to provide a low thermal resistance path from the IC junction to the PCB. Do not use as the electrical connection to GND. — 4 6 4 WDI — 10 11 9 MR — 11 12 10 SRT — 16 14 12 RESET — — 9 7 REF — — 10 8 WDO — — — — EP _______________________________________________________________________________________ 9 Low-Voltage, Quad-/Hex-/Octal-Voltage µP Supervisors MAX16000–MAX16007 Pin Description (MAX16006/MAX16007) PIN MAX16006 MAX16007 NAME FUNCTION 1 2 3 4 1 2 3 4 IN5 IN6 IN7 IN8 Monitored Input Voltage 5. See Table 1 for the input voltage threshold. Monitored Input Voltage 6. See Table 1 for the input voltage threshold. Monitored Input Voltage 7. See Table 1 for the input voltage threshold. Monitored Input Voltage 8. See Table 1 for the input voltage threshold. Watchdog Timer Input. If WDI remains low or high for longer than the watchdog timeout period, RESET is asserted and the timer is cleared. The timer also clears whenever a reset is asserted or a rising or falling edge on WDI is detected. The watchdog timer enters a startup period that allows 54s for the first transition to occur before a reset. Leave WDI unconnected to disable the watchdog timer. The WDI floating-state detector uses a small 400nA current. Therefore, do not connect WDI to anything that will source or sink more than 200nA. Note that the leakage current specification for most three-state drivers exceeds 200nA. Ground Unmonitored Power-Supply Input Output 5. When the voltage at IN5 falls below its threshold, OUT5 goes low and stays low until the voltage at IN5 exceeds its threshold. The open-drain output has a 30µA internal pullup to VCC. Output 6. When the voltage at IN6 falls below its threshold, OUT6 goes low and stays low until the voltage at IN6 exceeds its threshold. The open-drain output has a 30µA internal pullup to VCC. Output 7. When the voltage at IN7 falls below its threshold, OUT7 goes low and stays low until the voltage at IN7 exceeds its threshold. The open-drain output has a 30µA internal pullup to VCC. Output 8. When the voltage at IN8 falls below its threshold, OUT8 goes low and stays low until the voltage at IN8 exceeds its threshold. The open-drain output has a 30µA internal pullup to VCC. Active-Low Manual Reset Input. Pull MR low to assert RESET low. RESET remains low for the reset timeout period after MR is deasserted. MR is pulled up to VCC through a 20kΩ resistor. Set Reset Timeout Input. Connect a capacitor from SRT to GND to set the reset timeout period. The reset timeout period can be calculated as follows: Reset Timeout (s) = 2.06 x 106 (Ω) x CSRT (F). For the internal timeout period of 140ms (min), connect SRT to VCC. 5 5 WDI 6 7 8 9 10 11 12 6 7 — — — — 10 GND VCC OUT5 OUT6 OUT7 OUT8 MR 13 11 SRT 10 ______________________________________________________________________________________ Low-Voltage, Quad-/Hex-/Octal-Voltage µP Supervisors MAX16000–MAX16007 Pin Description (MAX16006/MAX16007) (continued) PIN MAX16006 MAX16007 NAME FUNCTION 14 15 16 17 18 12 — — — — MARGIN OUT4 OUT3 OUT2 OUT1 Margin Disable Input. Pull MARGIN low to deassert all outputs (go into high state), regardless of the voltage at any monitored input. Output 4. When the voltage at IN4 falls below its threshold, OUT4 goes low and stays low until the voltage at IN4 exceeds its threshold. The open-drain output has a 30µA internal pullup to VCC. Output 3. When the voltage at IN3 falls below its threshold, OUT3 goes low and stays low until the voltage at IN3 exceeds its threshold. The open-drain output has a 30µA internal pullup to VCC. Output 2. When the voltage at IN2 falls below its threshold, OUT2 goes low and stays low until the voltage at IN2 exceeds its threshold. The open-drain output has a 30µA internal pullup to VCC. Output 1. When the voltage at IN1 falls below its threshold, OUT1 goes low and stays low until the voltage at IN1 exceeds its threshold. The open-drain output has a 30µA internal pullup to VCC. Active-Low Reset Output. RESET asserts low when any of the monitored voltages falls below its respective threshold or MR is asserted. RESET remains asserted for the reset timeout period after all monitored voltages exceed their respective thresholds and MR is deasserted. This open-drain output has a 30µA internal pullup. Monitored Input Voltage 1. See Table 1 for the input voltage threshold. Monitored Input Voltage 2. See Table 1 for the input voltage threshold. Monitored Input Voltage 3. See Table 1 for the input voltage threshold. Monitored Input Voltage 4. See Table 1 for the input voltage threshold. Threshold Tolerance Input. Connect TOL to GND to select 5% threshold tolerance. Connect TOL to VCC to select 10% threshold tolerance. Not Internally Connected Exposed Pad. EP is internally connected to GND. Connect EP to the ground plane to provide a low thermal resistance path from the IC junction to the PCB. Do not use as the electrical connection to GND. 19 15 RESET 20 21 22 23 24 — — 16 17 18 19 20 8, 9, 13, 14 — IN1 IN2 IN3 IN4 TOL N.C. EP ______________________________________________________________________________________ 11 Low-Voltage, Quad-/Hex-/Octal-Voltage µP Supervisors MAX16000–MAX16007 Table 1. Input-Voltage-Threshold Selector PART MAX16000A MAX16000B MAX16000C MAX16000D MAX16000E MAX16001A MAX16001B MAX16001C MAX16001D MAX16001E MAX16002A MAX16002B MAX16002C MAX16002D MAX16002E MAX16003A MAX16003B MAX16003C MAX16003D MAX16003E MAX16004A MAX16004B MAX16004C MAX16004D MAX16004E MAX16005A MAX16005B MAX16005C MAX16005D MAX16005E MAX16006A MAX16006B MAX16006C MAX16006D MAX16006E MAX16006F MAX16007A MAX16007B MAX16007C MAX16007D IN1 3.3 3.3 ADJ 3.3 ADJ 3.3 3.3 ADJ 3.3 ADJ 3.3 3.3 ADJ 3.3 ADJ 3.3 3.3 3.3 ADJ ADJ 3.3 3.3 3.3 ADJ ADJ 3.3 3.3 3.3 ADJ ADJ 3.3 3.3 3.3 ADJ ADJ 5.0 3.3 3.3 3.3 ADJ IN2 2.5 ADJ 2.5 2.5 ADJ 2.5 ADJ 2.5 2.5 ADJ 2.5 ADJ 2.5 2.5 ADJ 2.5 ADJ 2.5 2.5 ADJ 2.5 ADJ 2.5 2.5 ADJ 2.5 ADJ 2.5 2.5 ADJ 2.5 ADJ 2.5 2.5 ADJ 3.3 2.5 ADJ 2.5 2.5 IN3 ADJ ADJ ADJ ADJ ADJ ADJ ADJ ADJ ADJ ADJ ADJ ADJ ADJ ADJ ADJ ADJ ADJ ADJ ADJ ADJ ADJ ADJ ADJ ADJ ADJ ADJ ADJ ADJ ADJ ADJ ADJ ADJ ADJ ADJ ADJ 3.0 ADJ ADJ ADJ ADJ IN4 1.8 1.8 1.8 ADJ ADJ 1.8 1.8 1.8 ADJ ADJ 1.8 1.8 1.8 ADJ ADJ 1.8 1.8 ADJ 1.8 ADJ 1.8 1.8 ADJ 1.8 ADJ 1.8 1.8 ADJ 1.8 ADJ 1.8 1.8 ADJ 1.8 ADJ 2.5 1.8 1.8 ADJ 1.8 IN5 — — — — — — — — — — — — — — — ADJ ADJ ADJ ADJ ADJ ADJ ADJ ADJ ADJ ADJ ADJ ADJ ADJ ADJ ADJ ADJ ADJ ADJ ADJ ADJ 1.8 ADJ ADJ ADJ ADJ IN6 — — — — — — — — — — — — — — — ADJ ADJ ADJ ADJ ADJ ADJ ADJ ADJ ADJ ADJ ADJ ADJ ADJ ADJ ADJ ADJ ADJ ADJ ADJ ADJ 1.5 ADJ ADJ ADJ ADJ IN7 — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — ADJ ADJ ADJ ADJ ADJ 1.2 ADJ ADJ ADJ ADJ IN8 — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — ADJ ADJ ADJ ADJ ADJ 0.9 ADJ ADJ ADJ ADJ ADJ MAX16007E ADJ ADJ ADJ ADJ ADJ ADJ ADJ Note: Other fixed thresholds may be available. Contact factory for availability. 12 ______________________________________________________________________________________ Low-Voltage, Quad-/Hex-/Octal-Voltage µP Supervisors MAX16000–MAX16007 Functional Diagrams VCC VCC RESET CIRCUIT IN1 OUT1 IN2 OUT2 OUTPUT DRIVER IN3 OUT3 EN IN4 OUT4 VCC TOL REFERENCE VCC MAX16000 UNDERVOLTAGE LOCKOUT VCC MARGIN Figure 1. MAX16000D Functional Diagram ______________________________________________________________________________________ 13 Low-Voltage, Quad-/Hex-/Octal-Voltage µP Supervisors MAX16000–MAX16007 Functional Diagrams (continued) WDI MR SRT VCC VCC WATCHDOG TIMER CIRCUIT TIMING RESET CIRCUIT IN1 RESET (OUT1) IN2 (OUT2) OUTPUT DRIVER IN3 (OUT3) EN IN4 (OUT4) VCC TOL REFERENCE VCC UNDERVOLTAGE LOCKOUT VCC MAX16001/ MAX16002 ( ) MAX16001 ONLY MARGIN Figure 2. MAX16001D/MAX16002D Functional Diagram 14 ______________________________________________________________________________________ Low-Voltage, Quad-/Hex-/Octal-Voltage µP Supervisors MAX16000–MAX16007 Functional Diagrams (continued) (WDI) (MR) (SRT) VCC VCC WATCHDOG TIMER CIRCUIT TIMING RESET CIRCUIT IN1 (RESET) OUT1 IN2 OUT2 IN3 OUT3 OUTPUT DRIVER IN4 OUT4 IN5 OUT5 IN6 EN OUT6 VCC TOL REFERENCE VCC UNDERVOLTAGE LOCKOUT VCC MAX16003/ MAX16004 MARGIN ( ) MAX16004 ONLY Figure 3. MAX16003C/MAX16004C Functional Diagram ______________________________________________________________________________________ 15 Low-Voltage, Quad-/Hex-/Octal-Voltage µP Supervisors MAX16000–MAX16007 Functional Diagrams (continued) WDO WDI MR SRT VCC VCC WATCHDOG TIMER CIRCUIT TIMING RESET CIRCUIT IN1 RESET IN2 IN3 OUTPUT DRIVER IN4 IN5 IN6 EN VCC TOL REFERENCE VCC UNDERVOLTAGE LOCKOUT VCC MAX16005 REF MARGIN Figure 4. MAX16005C Functional Diagram 16 ______________________________________________________________________________________ Low-Voltage, Quad-/Hex-/Octal-Voltage µP Supervisors MAX16000–MAX16007 Functional Diagrams (continued) WDI MR SRT VCC VCC WATCHDOG TIMER CIRCUIT TIMING RESET CIRCUIT IN1 RESET (OUT1) IN2 (OUT2) IN3 (OUT3) OUTPUT DRIVER IN4 (OUT4) IN5 (OUT5) IN6 (OUT6) IN7 (OUT7) IN8 EN OUT8 VCC TOL REFERENCE VCC UNDERVOLTAGE LOCKOUT VCC MAX16006/ MAX16007 ( ) MAX16006 ONLY MARGIN Figure 5. MAX16006C/MAX16007C Functional Diagram ______________________________________________________________________________________ 17 Low-Voltage, Quad-/Hex-/Octal-Voltage µP Supervisors MAX16000–MAX16007 Detailed Description The MAX16000–MAX16007 are low-voltage, quad-/hex-/ octal-voltage µP supervisors in small thin QFN and TSSOP packages. These devices provide supervisory functions for complex multivoltage systems. The MAX16000/ MAX16001/MAX16002 monitor four voltages, the MAX16003/MAX16004/MAX16005 monitor six voltages, and the MAX16006/MAX16007 monitor eight voltages. The MAX16000/MAX16001/MAX16003/MAX16004/ MAX16006 offer independent outputs for each monitored voltage. The MAX16001/MAX16002/MAX16004– MAX16007 offer a reset output that asserts whenever any of the monitored voltages fall below their respective thresholds or the manual reset input is asserted. The reset output remains asserted for the reset timeout after all voltages are above their respective thresholds and the manual reset input is deasserted. The minimum reset timeout is internally set to 140ms or can be adjusted with an external capacitor. All open-drain outputs have internal 30µA pullups that eliminate the need for external pullup resistors. However, each output can be driven with an external voltage up to 5.5V. Other features offered include a manual reset input, a tolerance pin for selecting 5% or 10% input thresholds, and a margin enable function for deasserting the outputs during margin testing. The MAX16001/MAX16002/MAX16004–MAX16007 offer a watchdog timer that asserts RESET or an independent watchdog output (MAX16005) when the watchdog timeout period (1.6s typ) is exceeded. The watchdog timer can be disabled by floating the input. Window Detection A window detector circuit uses two auxiliary inputs in the configuration shown in Figure 8. External resistors set the two threshold voltages of the window detector circuit. External logic gates create the OUT signal. The window detection width is the difference between the threshold voltages (Figure 9). 5V VCC V1 V2 V3 V4 IN1 IN2 IN3 IN4 MAX16000 MAX16001 OUT1 OUT2 OUT3 OUT4 GND Figure 6. Quad Undervoltage Detector with LED Indicators 5V D1 Applications Information Undervoltage-Detection Circuit The open-drain outputs of the MAX16000–MAX16007 can be configured to detect an undervoltage condition. Figure 6 shows a configuration where an LED turns on when the comparator output is low, indicating an undervoltage condition. These devices can also be used in applications such as system supervisory monitoring, multivoltage level detection, and VCC bar-graph monitoring (Figure 7). VIN(5V) VCC IN1 OUT1 D2 OUT2 IN2 D3 IN3 MAX16000 MAX16001 OUT3 IN4 D4 Tolerance (TOL) The MAX16000–MAX16007 feature a pin-selectable threshold tolerance. Connect TOL to GND to select 5% threshold tolerance. Connect TOL to VCC to select 10% threshold tolerance. GND OUT4 Figure 7. VCC Bar-Graph Monitoring 18 ______________________________________________________________________________________ Low-Voltage, Quad-/Hex-/Octal-Voltage µP Supervisors MAX16000–MAX16007 R1 VTH1 = 1 + R2 ( ) (VTH + VTH_HYS) IN1 R2 IN2 IN3 VINTH 5V R1 R1 VCC OUT1 MAX16000 OUT2 MAX16001 OUT3 R2 OUT INPUT R3 IN4 R4 GND OUT4 VTH R1 = R2 (VV INTH TH -1 ) Figure 10. Setting the Adjustable Input R3 VTH4 = 1 + R4 VTH ( ) Adjustable Input Figure 8. Window Detection OUT1 V TH1 These devices offer several monitor options with adjustable input thresholds (see Table 1). The threshold voltage at each adjustable IN_ input is typically 0.394V (TOL = GND) or 0.372 (TOL = VCC). To monitor a voltage VINTH, connect a resistive-divider network to the circuit as shown in Figure 10. VINTH = VTH ((R1 / R2) + 1) R1 = R2 ((VINTH / VTH) - 1) Large resistors can be used to minimize current through the external resistors. For greater accuracy, use lowervalue resistors. Unused Inputs OUT4 V TH4 Connect any unused IN_ inputs to a voltage above its threshold. OUT_ Outputs (MAX16000/MAX16001/MAX16003/ MAX16004/MAX16006) OUT ∆V TH Figure 9. Output Response of Window Detector Circuit The OUT_ outputs go low when their respective IN_ inputs drop below their specified thresholds. The output is open drain with a 30µA internal pullup to VCC. For many applications, no external pullup resistor is required to interface with other logic devices. An external pullup resistor to any voltage from 0 to 5.5V overrides the internal pullup if interfacing to different logic supply voltages. Internal circuitry prevents reverse current flow from the external pullup voltage to VCC (Figure 11). ______________________________________________________________________________________ 19 Low-Voltage, Quad-/Hex-/Octal-Voltage µP Supervisors MAX16000–MAX16007 VCC = 3.3V 5V IN_ VTH_ VTH_ 100kΩ VCC VCC RESET 90% 10% tRD tRP OUT_ RESET OUT_ 90% 10% MAX16001/ MAX16002/ MAX16004–MAX16007 GND GND tD tD Figure 11. Interfacing to a Different Logic Supply Voltage Figure 12. Output Timing Diagram RESET Output (MAX16001/MAX16002/ MAX16004–MAX16007) RESET asserts low when any of the monitored voltages fall below their respective thresholds or MR is asserted. RESET remains asserted for the reset timeout period after all monitored voltages exceed their respective thresholds and MR is deasserted (see Figure 12). This open-drain output has a 30µA internal pullup. An external pullup resistor to any voltage from 0 to 5.5V overrides the internal pullup if interfacing to different logic supply voltages. Internal circuitry prevents reverse current flow from the external pullup voltage to VCC (Figure 11). WDO (MAX16005 Only) WDO asserts and stays low whenever any of the IN_ inputs fall below their respective thresholds. W DO deasserts without a timeout delay when all the IN_ inputs rise above their thresholds. When all the IN_ inputs rise above their thresholds, WDO asserts low whenever the watchdog timer times out. W DO deasserts after a valid WDI transition or if MR is pulled low. The watchdog timer begins counting after the reset timeout period once MR goes high. Pull MARGIN low to deassert WDO regardless of any other condition. The watchdog timer continues to run when MARGIN is low and if a timeout occurs. W DO will assert M R after MARGIN is deasserted. This open-drain output has a 30µA internal pullup. An external pullup resistor to any voltage from 0 to 5.5V overrides the internal pullup if interfacing to different logic supply voltages. Internal circuitry prevents reverse current flow from the external pullup voltage to VCC (Figure 11). 20 ______________________________________________________________________________________ Low-Voltage, Quad-/Hex-/Octal-Voltage µP Supervisors MAX16000–MAX16007 VTH + VTH_HYST VTH VIN VTH + VTH_HYST RESET tRP tRP WDO WDI t