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MAX807NCWE+

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MAX807NCWE+

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Part Number MAX807NCWE+
Manufacturer Maxim Integrated
Description IC SUPERVISOR MPU 16-SOIC
Datasheet MAX807NCWE+ Datasheet
Package 16-SOIC (0.295", 7.50mm Width)
In Stock 277 piece(s)
Unit Price $ 11.9700 *
Lead Time Can Ship Immediately
Estimated Delivery Time Dec 2 - Dec 7 (Choose Expedited Shipping)
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Part Number # MAX807NCWE+ (PMIC - Supervisors) is manufactured by Maxim Integrated and distributed by Heisener. Being one of the leading electronics distributors, we carry many kinds of electronic components from some of the world’s top class manufacturers. Their quality is guaranteed by its stringent quality control to meet all required standards.

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MAX807NCWE+ Specifications

ManufacturerMaxim Integrated
CategoryIntegrated Circuits (ICs) - PMIC - Supervisors
Datasheet MAX807NCWE+Datasheet
Package16-SOIC (0.295", 7.50mm Width)
Series-
TypeBattery Backup Circuit
Number of Voltages Monitored1
Output-
ResetActive High/Active Low
Reset Timeout140 ms Minimum
Voltage - Threshold4.425V
Operating Temperature0°C ~ 70°C (TA)
Mounting TypeSurface Mount
Package / Case16-SOIC (0.295", 7.50mm Width)
Supplier Device Package16-SOIC

MAX807NCWE+ Datasheet

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General Description The MAX807 microprocessor (µP) supervisory circuit reduces the complexity and number of components needed to monitor power-supply and battery-control func- tions in µP systems. A 70µA supply current makes the MAX807 ideal for use in portable equipment, while a 2ns chip-enable propagation delay and 250mA output current capability (20mA in battery-backup mode) make it suit- able for larger, higher-performance equipment. The MAX807 comes in 16-pin DIP, SO, and TSSOP pack- ages, and provides the following functions: • µP reset. The active-low RESET output is asserted dur- ing power-up, power-down, and brownout conditions, and is guaranteed to be in the correct state for VCC down to 1V. • Active-high RESET output. • Manual-reset input. • Two-stage power-fail warning. A separate low-line comparator compares VCC to a threshold 52mV above the reset threshold. This low-line comparator is more accurate than those in previous µP supervisors. • Backup-battery switchover for CMOS RAM, real-time clocks, µPs, or other low-power logic. • Write protection of CMOS RAM or EEPROM. • 2.275V threshold detector provides for power-fail warning and low-battery detection, or monitors a power supply other than +5V. • BATT OK status flag indicates that the backup-battery voltage is above +2.275V. • Watchdog-fault output—asserted if the watchdog input has not been toggled within a preset timeout period. Applications Computers Controllers Intelligent Instruments Critical µP Power Monitoring Portable/Battery-Powered Equipment Features ♦ Precision 4.675V (MAX807L), 4.425V (MAX807M), or 4.575V (MAX807N) Voltage Monitoring ♦ 200ms Power-OK/Reset Time Delay ♦ RESET and RESET Outputs ♦ Independent Watchdog Timer ♦ 1µA Standby Current ♦ Power Switching 250mA in VCC Mode 20mA in Battery-Backup Mode ♦ On-Board Gating of Chip-Enable Signals; 2ns CE Gate Propagation Delay ♦ MaxCap® and SuperCap® Compatible ♦ Voltage Monitor for Power Fail ♦ Backup-Battery Monitor ♦ Guaranteed RESET Valid to VCC = 1V ♦ ±1.5% Low-Line Threshold Accuracy 52mV above Reset Threshold M A X 8 0 7 L /M /N Full-Featured µP Supervisory Circuit with ±1.5% Reset Accuracy ________________________________________________________________ Maxim Integrated Products 1 19-0433; Rev 4; 11/05 For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. 16 15 14 13 12 11 10 9 1 2 3 4 5 6 7 8RESET RESET WDO CE INGND VCC OUT BATT TOP VIEW MAX807 CE OUT WDI LOW LINE MR BATT OK PFI PFO BATT ON DIP/SO/TSSOP Pin Configuration Ordering Information and Typical Operating Circuit appear at end of data sheet. SuperCap is a registered trademark of Baknor Industries. MaxCap is a registered trademark of Cesiwid, Inc.

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M A X 8 0 7 L /M /N Full-Featured µP Supervisory Circuit with ±1.5% Reset Accuracy 2 _______________________________________________________________________________________ ABSOLUTE MAXIMUM RATINGS ELECTRICAL CHARACTERISTICS (VCC = 4.60V to 5.5V for the MAX807L, VCC = 4.50V to 5.5V for the MAX807N, VCC = 4.35V to 5.5V for the MAX807M, VBATT = 2.8V, VPFI = 0V, TA = TMIN to TMAX. Typical values are tested with VCC = 5V and TA = +25°C, unless otherwise noted.) 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. Input Voltages (with respect to GND) VCC ..........................................................................-0.3V to 6V VBATT .......................................................................-0.3V to 6V All Other Inputs......................................-0.3V to (VOUT + 0.3V) Input Current VCC Peak ...........................................................................1.0A VCC Continuous .............................................................500mA IBATT Peak......................................................................250mA IBATT Continuous .............................................................50mA GND .................................................................................50mA All Other Inputs ................................................................50mA Continuous Power Dissipation (TA = +70°C) Plastic DIP (derate 10.53mW/°C above +70°C) ..........842mW Wide SO (derate 9.52mW/°C above +70°C)................762mW CERDIP (derate 10.00mW/°C above +70°C)...............800mW TSSOP (derate 6.70 mW/°C above +70°C) .................533mW Operating Temperature Ranges MAX807_C_E ......................................................0°C to +70°C MAX807_E_E ...................................................-40°C to +85°C MAX807_MJE ................................................-55°C to +125°C Storage Temperature Range .............................-65°C to +160°C Lead Temperature (soldering, 10s) .................................+300°C VBATT = 2.8V, VCC = 3.0V VCC = 0V, VBATT = 2.8V VCC = 3V, IOUT = 100mA VCC = 4.5V, IOUT = 250mA VBATT = 2.0V, IOUT = 5mA, VCC = 0V VBATT = 2.8V, IOUT = 10mA, VCC = 0V VBATT = 4.5V, IOUT = 20mA, VCC = 0V CONDITIONS µA -1.0 1.0 BATT Standby Current (Note 3) -0.1 0.1 µA 50 Supply Current in Battery- Backup Mode (excludes IOUT) (Note 2) 5 0.4 1 µA70 110 Supply Current in Normal Operating Mode (excludes IOUT) V VBATT - 0.20 VBATT - 0.08 VOUT in Battery-Backup Mode VBATT - 0.25 VBATT - 0.12 VBATT - 0.17 Ω 1.2 2.5 VCC to OUT On-Resistance 1.8 1.0 1.4 UNITSMIN TYP MAXSYMBOLPARAMETER V0 5.5 Operating Voltage Range VBATT, VCC (Note 1) MAX807C/E MAX807M VBATT = 2.0V, IOUT = 5mA VBATT = 2.8V, IOUT = 10mA VBATT = 4.5V, IOUT = 20mA Ω 16 40 BATT to OUT On-Resistance 12 25 8.5 TA = +25°C MAX807C/E MAX807M TA = +25°C TA = TMIN to TMAX VBATT = 2.8V Power up Power down V VBATT Battery-Switchover Threshold VBATT + 0.05 VCC = 3V, VBATT = 2.8V, IOUT = 100mA VCC = 4.5V VCC - 0.02IOUT = 25mA IOUT = 250mA, MAX807C/E IOUT = 250mA, MAX807M VOUT in Normal Operating Mode V VCC - 0.25 VCC - 0.12 VCC - 0.35 VCC - 0.22 VCC - 0.45 mV 0.1 0.4 Battery-Switchover Hysteresis 50 BATT ON Output, Low Voltage VRST (max), ISINK = 3.2mA V 2 2.7BATT ON Output, High Voltage VCC = 0V, ISOURCE = 0.1mA, VBATT = 2.8V V

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M A X 8 0 7 L /M /N Full-Featured µP Supervisory Circuit with ±1.5% Reset Accuracy _______________________________________________________________________________________ 3 VIH ELECTRICAL CHARACTERISTICS (continued) (VCC = 4.60V to 5.5V for the MAX807L, VCC = 4.50V to 5.5V for the MAX807N, VCC = 4.35V to 5.5V for the MAX807M, VBATT = 2.8V, VPFI = 0V, TA = TMIN to TMAX. Typical values are tested with VCC = 5V and TA = +25°C, unless otherwise noted.) CONDITIONS UNITSMIN TYP MAXSYMBOLPARAMETER Sink current 70 4.600 4.675 4.750 V 5 BATT ON Output Short-Circuit Current Source current, VCC = 0V, VBATT = 2.8V 4.350 4.425 4.500 LOW LINE to RESET Threshold Voltage VLR Reset Threshold Hysteresis VCC falling 30 52 70 mV 13 mV 4.500 4.575 4.650VRSTReset Threshold VCC rising and falling 4.63 4.71MAX807N VCC to LOW LINE Delay VCC falling at 1mV/µs 24 µs µs26VCC to RESET Delay VCC falling at 1mV/µs 4.48 4.56MAX807M Minimum Watchdog Input Pulse Width Watchdog-Timeout Period VIL = 0.8V, VIH = 0.75 x VCC tWD 100 ns V 1.12 1.6 2.24 s ms140 200 280tRPRESET Active-Timeout Period VCC rising 4.73 4.81MAX807L MAX807L MAX807N MAX807M 0.3 0.3 ISINK = 50µA, VBATT = 0V, VCC falling VCC - 1.5 VCC - 0.1 RESET Output Voltage ISOURCE = 0.1mA 0.1 0.4ISINK = 3.2mA, VCC = 4.25V mA 60Output sink current, VCC = 4.25V 1.6 ISC RESET Output Short-Circuit Current Output source current VCC = 1V, MAX807_C VCC = 1.2V, MAX807_E/M V 0.4ISINK = 3.2mA VCC - 1.5 RESET Output Voltage ISOURCE = 5mA V 0.4ISINK = 3.2mA, VCC = 4.25V VCC - 1.5 LOW LINE Output Voltage ISOURCE = 5mA mA 60Output sink current 15 ISC RESET Output Short-Circuit Current Output source current, VCC = 4.25V mA 28Output sink current, VCC = 4.25V 20 ISC LOW LINE Output Short-Circuit Current Output source current V 0.4ISINK = 3.2mA VCC - 1.5 WDO Output Voltage ISOURCE = 5mA mA mA 35Output sink current 20 ISC WDO Output Short-Circuit Current Output source current VLL V LOW LINE Threshold, VCC Rising V 0.75 x VCC 0.8 VIHWDI Threshold Voltage (Note 4) VIL µA -50 -10Reset deasserted, WDI = 0V 16 50 WDI Input Current Reset deasserted, WDI = VCC RESET, LOW LINE, AND WATCHDOG TIMER

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M A X 8 0 7 L /M /N Full-Featured µP Supervisory Circuit with ±1.5% Reset Accuracy 4 _______________________________________________________________________________________ Note 1: Either VCC or VBATT can go to 0 if the other is greater than 2.0V. Note 2: The supply current drawn by the MAX807 from the battery (excluding IOUT) typically goes to 15µA when (VBATT - 0.1V) < VCC < VBATT. In most applications, this is a brief period as VCC falls through this region (see Typical Operating Characteristics). Note 3: “+”= battery discharging current, “-”= battery charging current. Note 4: WDI is internally connected to a voltage-divider between VCC and GND. If unconnected, WDI is driven to 1.8V (typical), disabling the watchdog function. Note 5: Overdrive (VOD) is measured from center of hysteresis band. Note 6: The chip-enable resistance is tested with VCE IN = VCC/2, and ICE IN = 1mA. Note 7: The chip-enable propagation delay is measured from the 50% point at CE IN to the 50% point at CE OUT. ELECTRICAL CHARACTERISTICS (continued) (VCC = 4.60V to 5.5V for the MAX807L, VCC = 4.50V to 5.5V for the MAX807N, VCC = 4.35V to 5.5V for the MAX807M, VBATT = 2.8V, VPFI = 0V, TA = TMIN to TMAX. Typical values are tested with VCC = 5V and TA = +25°C, unless otherwise noted.) CONDITIONS UNITSMIN TYP MAXSYMBOLPARAMETER PFI Leakage Current ±0.005 ±40 nA mV20PFI Hysteresis µA±0.00002 ±1CE IN Leakage Current Disabled mode, MR = 0V µs14PFI to PFO Delay (Note 5) PFI Input Threshold VPFT VPFI falling 2.22 2.285 2.35 V 2.20 2.265 2.33 RESET to CE OUT Delay VCC falling 28 µs Ω75 150CE IN to CE OUT Resistance (Note 6) Enabled mode, VCC = VRST (max) MR Minimum Pulse Input 1 µs ns170 MR-to-RESET Propagation Delay mA17 CE OUT Short-Circuit Current (RESET Active) VCC = 5V, disabled mode, CE OUT = 0, MR = 0V ns2 8 CE IN to CE OUT Propagation Delay (Note 7) VCC = 5V, CLOAD = 50pF, 50Ω source impedance driver V 3.5 CE OUT Output Voltage High (RESET Active) Disabled mode, MR = 0V MR Threshold VIH 2.4 V BATT OK Threshold VBOK 2.200 2.265 2.350 V BATT OK Hysteresis 20 mV Output Voltage (PFO, BATT OK) VOL ISINK = 3.2mA 0.4 V Output Short-Circuit Current ISC Output sink current 35 mA VPFI rising VBATT - 0.1 VBATT VCC = 5V, IOUT = 2mA VCC = 0V, IOUT = 10µA VIL 0.8 VOH ISOURCE = 5mA VCC - 1.5 Output source current 20 VOD = 30mV, VPFI falling MR Pullup Current MR = 0V 50 100 200 µA CHIP-ENABLE GATING MANUAL RESET INPUT BATT OK COMPARATOR LOGIC OUTPUTS

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M A X 8 0 7 L /M /N Full-Featured µP Supervisory Circuit with ±1.5% Reset Accuracy _______________________________________________________________________________________ 5 __________________________________________Typical Operating Characteristics (VCC = 5V, VBATT = 2.8V, PFI = 0, no load, TA = +25°C, unless otherwise noted.) 80 60 -60 -20 60 140 VCC SUPPLY CURRENT vs. TEMPERATURE (NORMAL OPERATING MODE) 64 76 M A X 8 0 7 -0 1 TEMPERATURE (°C) V C C S U P P LY C U R R EN T (µ A ) 20 100-40 40 1200 80 72 68 62 66 78 74 70 3.0 2.5 2.0 1.5 1.0 0.5 0 -60 -20 60 140 BATTERY SUPPLY CURRENT vs. TEMPERATURE (BATTERY-BACKUP MODE) M A X 8 0 7 -0 2 TEMPERATURE (°C) B A TT ER Y S U P P LY C U R R EN T (µ A ) 20 100-40 40 1200 80 6 5 4 3 2 1 0 -60 -20 60 140 CHIP-ENABLE PROPAGATION DELAY vs. TEMPERATURE M A X 8 0 7 -0 3 TEMPERATURE (°C) P R O P A G A TI O N D EL A Y ( ns ) 20 100-40 40 1200 80 30 5 -60 -20 60 140 BATT-TO-OUT ON-RESISTANCE vs. TEMPERATURE 10 25 M A X 8 0 7 -0 4 TEMPERATURE (°C) B A TT -T O -O U T O N -R ES IS TA N C E (Ω ) 20 100-40 40 1200 80 20 15 VBATT = 2.0V VBATT = 2.8V VBATT = 4.5V VCC = 0V IOUT = 10mA 4.70 4.65 4.60 4.55 4.50 4.45 4.40 -60 -20 60 140 RESET THRESHOLD vs. TEMPERATURE M A X 8 0 7 -0 7 TEMPERATURE (°C) R ES ET T H R ES H O LD ( V ) 20 100-40 40 1200 80 MAX807L MAX807N MAX807M 1.6 1.5 1.4 1.3 1.2 1.1 1.0 0.9 0.8 0.7 -60 -20 60 140 VCC-TO-OUT ON-RESISTANCE vs. TEMPERATURE M A X 8 0 7 -0 5 TEMPERATURE (°C) V C C -T O -O U T O N -R ES IS TA N C E (Ω ) 20 100-40 40 1200 80 IOUT = 250mA 2.340 2.320 2.300 2.280 2.260 2.240 2.220 2.200 -60 -20 60 140 PFI THRESHOLD vs. TEMPERATURE (VPFI FALLING) M A X 8 0 7 -0 6 TEMPERATURE (°C) P FI T H R ES H O LD ( V ) 20 100-40 40 1200 80 280 260 240 220 200 180 160 140 -60 -20 60 140 RESET TIMEOUT PERIOD vs. TEMPERATURE (VCC RISING) M A X 8 0 7 -0 8 TEMPERATURE (°C) R ES ET T IM EO U T P ER IO D ( m s) 20 100-40 40 1200 80 0 10 20 30 40 50 60 70 80 -60 -20 60 140 LOW LINE -TO-RESET THRESHOLD vs. TEMPERATURE (VCC FALLING) M A X 8 0 7 -0 9 TEMPERATURE (°C) LO W L IN E- TO -R ES ET T H R ES H O LD ( m V ) 20 100-40 40 1200 80

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M A X 8 0 7 L /M /N Full-Featured µP Supervisory Circuit with ±1.5% Reset Accuracy 6 _______________________________________________________________________________________ Typical Operating Characteristics (contiued) (VCC = 5V, VBATT = 2.8V, PFI = 0, no load, TA = +25°C, unless otherwise noted.) 4.75 4.80 4.70 4.65 4.60 4.55 4.50 4.45 4.40 -60 -20 60 140 LOW LINE THRESHOLD vs. TEMPERATURE (VCC RISING) M A X 8 0 7 -1 0 TEMPERATURE (°C) LO W L IN E T H R ES H O LD ( V ) 20 100-40 40 1200 80 L VERSION N VERSION M VERSION 0 5 10 15 20 25 30 35 40 -60 -20 60 140 LOW LINE COMPARATOR PROPAGATION DELAY vs. TEMPERATURE (VCC FALLING) M A X 8 0 7 -1 1 TEMPERATURE (°C) LO W L IN E C O M P A R A TO R P R O P D EL A Y ( µs ) 20 100-40 40 1200 80 VCC FALLING AT 1mV/µs 0 5 10 15 20 25 30 35 40 -60 -20 60 140 RESET COMPARATOR PROPAGATION DELAY vs. TEMPERATURE (VCC FALLING) M A X 8 0 7 -1 2 TEMPERATURE (°C) R ES ET C O M P A R A TO R P R O P D EL A Y ( µs ) 20 100-40 40 1200 80 VCC FALLING AT 1mV/µs 0 2 4 6 8 10 12 14 16 2.5 2.6 2.7 2.8 2.9 3.0 BATTERY CURRENT vs. INPUT SUPPLY VOLTAGE M A X 8 0 7 -1 3 VCC (V) B A TT ER Y C U R R EN T (µ A ) 1000 100 10 1 1 10010 1000 VCC-TO-OUT vs. OUTPUT CURRENT M A X 8 0 7 -1 6 IOUT (mA) V C C - V O U T (m V ) SLOPE = 1.0Ω 0 50Ω DRIVER 2 4 6 8 0 50 100 CHIP-ENABLE PROPAGATION DELAY vs. CE OUT LOAD CAPACITANCE M A X 8 0 7 -1 4 CLOAD (pF) P R O P A G A TI O N D EL A Y ( ns ) 1000 100 10 1 10 100 BATT-TO-OUT vs. OUTPUT CURRENT M A X 8 0 7 -1 5 IOUT (mA) B A TT -T O -O U T (m V ) VCC = 0V SLOPE = 12Ω 1000 100 10 1 1 10010 1000 MAXIMUM TRANSIENT DURATION vs. RESET COMPARATOR OVERDRIVE M A X 8 0 7 -1 7 RESET COMPARATOR OVERDRIVE (mV) M A X IM U M T R A N S IE N T D U R A TI O N ( µs ) RESET OCCURS

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M A X 8 0 7 L /M /N Full-Featured µP Supervisory Circuit with ±1.5% Reset Accuracy _______________________________________________________________________________________ 7 Pin Description Active-Low Reset Output. RESET is triggered and stays low when VCC is below the reset threshold or when MR is low. It remains low 200ms after VCC rises above the reset threshold or MR returns high. RESET has a strong pulldown but a relatively weak pullup, and can be wire-OR connected to logic gates. Valid for VCC ≥ 1V. RESET swings between VCC and GND. RESET9 Watchdog Output. This CMOS-logic output goes low if WDI remains high or low longer than the watch- dog-timeout period (tWD), and remains low until the next transition of WDI. WDO remains high if WDI is unconnected. WDO is high during reset. WDO swings between VCC and GND. Connect WDO to MR to generate resets during watchdog faults. WDO10 Chip-Enable Output. Output to the chip-enable gating circuit. CE OUT is pulled up to the higher of VCC or VBATT, when the chip-enable gate is disabled. CE OUT11 Chip-Enable InputCE IN12 Battery-On Output. CMOS-logic output/external bypass switch driver. High when OUT is connected to BATT and low when OUT is connected to VCC. Connect the base of a PNP transistor or gate of a PMOS transistor to BATT ON for IOUT requirements exceeding 250mA. BATT ON swings between the higher of VCC and VBATT and GND. BATT ON13 GroundGND5 Manual-Reset Input. A logic low on MR asserts reset. Reset remains asserted as long as MR remains low and for 200ms after MR returns high. MR is an active-low input with an internal pullup to VCC. It can be driven using TTL or CMOS logic, or shorted to ground with a switch. Connect to VCC, or leave uncon- nected if not used. MR6 Low-Line Comparator Output. This CMOS-logic output goes low when VCC falls to 52mV above the reset threshold. Use this output to generate an NMI to initiate an orderly shutdown routine when VCC is falling. LOW LINE swings between VCC and GND. LOW LINE7 Active-High Reset Output. RESET is the inverse of RESET. It is a CMOS output that sources and sinks current. RESET swings between VCC and GND. RESET8 Watchdog Input. If WDI remains high or low longer than the watchdog-timeout period (1.6s, typ), WDO goes low. Leave unconnected to disable the watchdog function. WDI4 Input Supply Voltage, nominally +5V. Bypass with a 0.1µF capacitor to GND.VCC3 PIN Power-Fail Output. This CMOS-logic output goes low when PFI is less than VPFT (2.265V). Valid for VCC ≥ 4V. PFO swings between VCC and GND. PFO2 Power-Fail Input. When PFI is less than VPFT (2.265V), PFO goes low. Connect to ground when unused.PFI1 FUNCTIONNAME Backup-Battery Input. When VCC falls below the reset threshold and VBATT, OUT switches from VCC to BATT. VBATT may exceed VCC. The battery can be removed while the MAX807 is powered-up, provided BATT is bypassed with a 0.1µF capacitor to GND. If no battery is used, connect BATT to ground, and connect VCC and OUT together. BATT14 Battery-OK Signal Output. High in normal operating mode when VBATT exceeds VBOK (2.265V). Valid for VCC ≥ 4V. BATT OK15 Output Supply Voltage to CMOS RAM. When VCC exceeds the reset threshold or VCC > VBATT, OUT is connected to VCC. When VCC falls below the reset threshold and VBATT, OUT connects to BATT. Bypass OUT with a 0.1µF capacitor to GND. OUT16

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Detailed Description The MAX807 µP supervisory circuit provides power- supply monitoring, backup-battery switchover, and pro- gram execution watchdog functions in µP systems (Figure 1). Use of BiCMOS technology results in an improved 1.5% reset-threshold precision, while keeping supply currents typically below 70µA. The MAX807 is intended for battery-powered applications that require high reset-threshold precision, allowing a wide power- supply operating range while preventing the system from operating below its specified voltage range. RESET and RESET Outputs The MAX807’s RESET output ensures that the µP pow- ers up in a known state, and prevents code execution errors during power-down and brownout conditions. It accomplishes this by resetting the µP, terminating pro- gram execution when VCC dips below the reset thresh- old or MR is pulled low. Each time RESET is asserted it stays low for the 200ms reset timeout period, which is set by an internal timer to ensure the µP has adequate time to return to an initial state. Any time VCC goes below the reset threshold before the reset-timeout peri- od is completed, the internal timer restarts. The watch- dog timer can also initiate a reset if WDO is connected to MR (see the Watchdog Input section).M A X 8 0 7 L /M /N Full-Featured µP Supervisory Circuit with ±1.5% Reset Accuracy 8 _______________________________________________________________________________________ MAX807 CE IN PFI GND VCC BATT VCC THE HIGHER OF VCC OR VBATT BATTERY-BACKUP COMPARATOR RESET COMPARATOR LOW-LINE COMPARATOR BATTERY-OK COMPARATOR POWER-FAIL COMPARATOR 2.275V P OUT BATT ON LOW LINE BATT OK PFO WDI MR 50kΩ RESET RESET WDO CE OUT N P P N WATCHDOG TRANSITION DETECTOR STATE MACHINE OSCILLATOR Figure 1. Block Diagram

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M A X 8 0 7 L /M /N Full-Featured µP Supervisory Circuit with ±1.5% Reset Accuracy _______________________________________________________________________________________ 9 The RESET output is active low and implemented with a strong pulldown/relatively weak pullup structure. It is guaranteed to be a logic low for 0 < VCC < VRST, pro- vided VBATT is greater than 2V. Without a backup bat- tery, RESET is guaranteed valid for VCC ≥ 1. It typically sinks 3.2mA at 0.1V saturation voltage in its active state. The RESET output is the inverse of the RESET output; it both sources and sinks current and cannot be wire-OR connected. Figure 2a shows a timing diagram with VCC rising and Figure 2b shows VCC falling. Manual Reset Input Many µP-based products require manual-reset capabil- ity to allow an operator or test technician to initiate a reset. The Manual Reset (MR) input permits the genera- tion of a reset in response to a logic low from a switch, WDO, or external circuitry. Reset remains asserted while MR is low, and for 200ms after MR returns high. MR has an internal 50µA to 200µA pullup current, 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. Connect a normally open momentary switch from MR to GND to create a manual-reset function; external debounce circuitry is not required. If MR is dri- ven from long cables or if the device is used in a noisy environment, connect a 0.1µF capacitor from MR to ground to provide additional noise immunity. As shown in Figure 3, diode-ORed connections can be used to allow manual resets from multiple sources. Figure 4 shows the reset timing. Watchdog Timer Watchdog Input The watchdog circuit monitors the µP’s activity. If the µP does not toggle the watchdog input (WDI) within 1.6s, WDO goes low. The internal 1.6s timer is cleared and WDO returns high when reset is asserted or when a transition (low-to-high or high-to-low) occurs at WDI while RESET is high. As long as reset is asserted, the timer remains cleared and does not count. As soon as reset is released, the timer starts counting (Figure 5). Supply current is typically reduced by 10µA when WDI is at a valid logic level. VRESET VLOW LINE VCC (MAX801) VRESET (MAX808) VCE OUT VRST VLL tRP tRP VBATT SHOWN FOR VCC = 0 to 5V, VBATT = 2.8V, CE IN = GND VRESET VLOW LINE VCC VRESET VCE OUT VRSTVRST + VLR VBATT SHOWN FOR VCC = 5V to 0, VBATT = 2.8V, CE IN = GND Figure 2a. Timing Diagram, VCC Rising Figure 2b. Timing Diagram, VCC Falling MAX807 * * OTHER RESET SOURCES MANUAL RESET MR *DIODES NOT REQUIRED ON OPEN-DRAIN OUTPUTS. Figure 3. Diode “OR” Connections Allow Multiple Reset Sources to Connect to MR

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LT1585ACM-1.5#TRPBF LT1585ACM-1.5#TRPBF Linear Technology, IC REG LINEAR 1.5V 5A D2PAK-3, TO-263-4, D2Pak (3 Leads + Tab), TO-263AA, - View
RCS2012F5110CS RCS2012F5110CS Samsung, RESISTOR 0805 511OHM 0.125W, -, - View
ERM5-075-04.0-L-DV-WT-TR ERM5-075-04.0-L-DV-WT-TR Samtec Inc., .5MM EDGE RATE TERMINAL ASSEMBLY, -, - View
LJT06RE-15-35PA-014 LJT06RE-15-35PA-014 Amphenol Aerospace Operations, LJT 37C 37#22D PIN WALL RECP, -, - View
97-3106A20-17PW-417-940 97-3106A20-17PW-417-940 Amphenol Industrial Operations, AB 6C 1#16, 5#12 PIN PLUG, -, - View
RMM36DTBN-S273 RMM36DTBN-S273 Sullins Connector Solutions, CONN EDGE DUAL FMALE 72POS 0.156, -, - View
KTPS24-24010MP-VI-P1 KTPS24-24010MP-VI-P1 Volgen America/Kaga Electronics USA, AC/DC WALL MOUNT ADAPTER 24V 24W, -, - View
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MAX807NCWE+

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