Reset Circuits with Capacitor-Adjustable Reset/Watchdog Timeout Delay
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19-2530; 8/03
Reset Circuits with Capacitor-Adjustable Reset/Watchdog Timeout Delay
MAX6746-MAX6753 low-power microprocessor (µP) supervisory circuits monitor single/dual system supply voltages from 1.575V provide maximum adjustability reset watchdog functions. These devices assert reset signal whenever supply voltage RESET falls below reset threshold when manual reset pulled low. reset output remains asserted reset timeout period after RESET rise above reset threshold. reset function features immunity power-supply transients. MAX6746-MAX6753 have factory-trimmed reset threshold voltages approximately 100mV increments from 1.575V 5.0V and/or adjustable reset threshold voltages using external resistors. reset watchdog delays adjustable with external capacitors. MAX6746-MAX6751 contain watchdog select input that extends watchdog timeout period 128x. MAX6752/MAX6753 contain window watchdog timer that looks activity outside expected window operation. MAX6746-MAX6753 available with push-pull open-drain active-low RESET output. MAX6746- MAX6753 available 8-pin SOT23 package fully specified over automotive temperature range (-40°C +125°C).
Features
Factory-Set Reset Threshold Options from 1.575V ~100mV Increments Adjustable Reset Threshold Options Single/Dual Voltage Monitoring Capacitor-Adjustable Reset Timeout Capacitor-Adjustable Watchdog Timeout Min/Max (Windowed) Watchdog Option Manual Reset Input Option Guaranteed RESET Valid 3.7µA Supply Current Push-Pull Open-Drain RESET Output Options Power-Supply Transient Immunity Small 8-Pin SOT23 Packages
MAX6746-MAX6753
Ordering Information
PART MAX6746KA_ MAX6747KA_ MAX6748KA-T MAX6749KA-T MAX6750KA_ MAX6751KA_ MAX6752KA_ MAX6753KA_ TEMP RANGE -40°C +125°C -40°C +125°C -40°C +125°C -40°C +125°C -40°C +125°C -40°C +125°C -40°C +125°C -40°C +125°C PIN-PACKAGE SOT23-8 SOT23-8 SOT23-8 SOT23-8 SOT23-8 SOT23-8 SOT23-8 SOT23-8
Applications
Medical Equipment Automotive Intelligent Instruments Portable Equipment Battery-Powered Computers/Controllers Embedded Controllers Critical Monitoring Set-Top Boxes Computers
Configurations
VIEW
RESET (MR) RESET
Note: represents number suffix needed when ordering reset threshold voltage value MAX6746/MAX6747 MAX6750-MAX6753. reset threshold voltages available approximately 100mV increments. Table contains suffix reset factory-trimmed voltages. devices available tape-and-reel only. There 2500-piece minimum order increment standard versions (see Table Sample stock typically held standard versions only. Nonstandard versions require minimum order increment 10,000 pieces. Contact factory availability.
MAX6746- MAX6751
Selector Guide appears data sheet. Typical Operating Circuit appears data sheet.
SOT23-8
MAX6746 MAX6747 ONLY.
Configurations continued data sheet. Maxim Integrated Products
pricing, delivery, ordering information, please contact Maxim/Dallas Direct! 1-888-629-4642, visit Maxim's website www.maxim-ic.com.
Reset Circuits with Capacitor-Adjustable Reset/Watchdog Timeout Delay MAX6746-MAX6753
ABSOLUTE MAXIMUM RATINGS
.-0.3V +6.0V SRT, SWT, SET0, SET1, RESET WDS, WDI, .-0.3V (VCC 0.3V) RESET (Push-Pull) GND.-0.3V (VCC 0.3V) RESET (Open Drain) .-0.3V +6.0V Input Current (All Pins) .±20mA Output Current (RESET) .±20mA Continuous Power Dissipation +70°C) 8-Pin SOT23 (derate 8.9mW/°C above +70°C).714mW Operating Temperature Range .-40°C +125°C Storage Temperature Range .-65°C +150°C Junction Temperature .+150°C Lead Temperature (soldering, 10s) .+300°C
Stresses beyond those listed under "Absolute Maximum Ratings" cause permanent damage device. These stress ratings only, functional operation device these other conditions beyond those indicated operational sections specifications implied. Exposure absolute maximum rating conditions extended periods affect device reliability.
ELECTRICAL CHARACTERISTICS
(VCC +1.2V +5.5V, TMIN TMAX, unless otherwise specified. Typical values +25°C.) (Note
PARAMETER Supply Voltage SYMBOL CONDITIONS +125°C -40°C 5.5V Supply Current 3.3V 2.0V Reset Threshold Hysteresis Reset Delay Reset Timeout Period Ramp Current Ramp Threshold Normal Watchdog Timeout Period (MAX6746-MAX6751) Extended Watchdog Timeout (MAX6746-MAX6751) Slow Watchdog Period (MAX6752/MAX6753) Fast Watchdog Timeout Period, Ratio (MAX6752/MAX6753) Fast Watchdog Timeout Period, Ratio (MAX6752/MAX6753) IRAMP VRAMP tWD2 VHYST falling from 100mV 100mV 1mV/µs CSRT 1500pF CSRT 100pF VSRT 1.23V; 1.6V 1.6V (VRAMP rising) CSWT 1500pF CSWT 100pF CSWT 1500pF CSWT 100pF CSWT 1500pF CSWT 100pF CSWT 1500pF tWD1 CSWT 100pF CSWT 1500pF tWD1 CSWT 100pF 4.05 45.53 8.09 60.71 75.89 91.08 728.6 728.6 1.173 5.692 5.692 selection table -40°C to+125°C 7.590 0.506 1.235 7.590 0.506 971.5 64.77 971.5 64.77 121.43 151.80 1214.4 1214.4 1.297 9.487 9.487 UNITS
Reset Circuits with Capacitor-Adjustable Reset/Watchdog Timeout Delay
ELECTRICAL CHARACTERISTICS (continued)
(VCC +1.2V +5.5V, TMIN TMAX, unless otherwise specified. Typical values +25°C.) (Note
PARAMETER Fast Watchdog Timeout Period, Ratio (MAX6752/MAX6753) Fast Watchdog Minimum Period (MAX6752/MAX6753) Ramp Current Ramp Threshold RESET Output Voltage Open-Drain, Push-Pull (Asserted) RESET Output Voltage HIGH, Push-Pull (Not Asserted) RESET Output Leakage Current, Open Drain IRAMP VRAMP VSWT 1.23V, 1.6V 1.6V (VRAMP rising) 1.0V, ISINK 50µA 2.7V, ISINK 1.2mA 4.5V, ISINK 3.2mA 1.8V, ISOURCE 200µA 2.25V, ISOURCE 500µA 4.5V, ISOURCE 800µA ILKG VTH, reset asserted, RESET 5.5V SYMBOL tWD1 CSWT 100pF 2000 1.173 1.235 1.297 1.01 CONDITIONS CSWT 1500pF 11.38 15.18 18.98 UNITS
MAX6746-MAX6753
DIGITAL INPUTS (MR, SET0, SET1, WDI, WDS) Input Logic Levels Minimum Pulse Width Glitch Rejection RESET Delay Pullup Resistance Minimum Pulse Width RESET RESET Threshold RESET Leakage Current RESET RESET Delay VRESET IRESET RESET falling 1mV/µs -40°C +125°C 1.216 1.235 1.254 Pullup 4.0V 4.0V
Note Production testing done +25°C. Over temperature limits guaranteed design.
Reset Circuits with Capacitor-Adjustable Reset/Watchdog Timeout Delay MAX6746-MAX6753
Typical Operating Characteristics
(VCC +5V, +25°C, unless otherwise noted.)
SUPPLY CURRENT SUPPLY VOLTAGE
MAX6746 toc02 MAX6746 toc03
RESET TIMEOUT PERIOD CSRT
MAX6746 toc01
WATCHDOG TIMEOUT PERIOD CSWT
100,000 WATCHDOG TIMEOUT PERIOD (ms) 10,000 EXTENDED MODE 1000 NORMAL MODE MAX6746-MAX6751 SUPPLY CURRENT (µA) 1000 CSWT (pF) 10,000 100,000
10,000
RESET TIMEOUT PERIOD (ms)
1000
1000 CSRT (pF) 10,000 100,000
SUPPLY VOLTAGE
NORMALIZED RESET TIMEOUT PERIOD TEMPERATURE
MAX6746 toc04
NORMALIZED WATCHDOG TIMEOUT PERIOD TEMPERATURE
1.15 NORMALIZED TIMEOUT PERIOD 1.10 1.05 1.00 0.95 0.90 0.85 0.80 CSWT 100pF CSWT 1500pF
MAX6746 toc05
MAXIMUM TRANSIENT DURATION RESET THRESHOLD OVERDRIVE
TRANSIENT DURATION (µs) 2.92V 1000 RESET OCCURS ABOVE CURVE
MAX6746 toc06
1.20 NORMALIZED TIMEOUT PERIOD 1.15 1.10 CSRT 100pF 1.05 1.00 0.95 0.90
1.20
CSRT 1500pF
TEMPERATURE (°C)
TEMPERATURE (°C)
RESET THRESHOLD OVERDRIVE (mV)
SUPPLY CURRENT TEMPERATURE
MAX6746 toc07
NORMALIZED RESET THRESHOLD VOLTAGE TEMPERATURE
MAX6746 toc08
RESET THRESHOLD SUPPLY VOLTAGE
MAX6746 toc08b
NORMALIZED RESET THRESHOLD VOLTAGE
SUPPLY CURRENT (µA) 3.3V 1.8V
1.010 1.008 1.006 1.004 1.002 1.000 0.998 0.996 0.994 0.992 0.990
1.240
RESET THRESHOLD
1.239
1.238
1.237
1.236
1.235 TEMPERATURE (°C) SUPPLY VOLTAGE
TEMPERATURE (°C)
Reset Circuits with Capacitor-Adjustable Reset/Watchdog Timeout Delay
Typical Operating Characteristics (continued)
(VCC +5V, +25°C, unless otherwise noted.)
RESET DELAY TEMPERATURE (VCC FALLING)
MAX6746 toc09
MAX6746-MAX6753
RESET WATCHDOG TIMEOUT PERIOD
MAX6746 toc10
RESET WATCHING TIMEOUT PERIOD
CSWT CSRT 1500pF
MAX6746 toc11
27.0
FALLING 1mV/µs
0.60
CSWT CSRT 100pF
TIMEOUT PERIOD (ms)
RESET DELAY (µs)
26.6
0.56 TIMEOUT PERIOD (ms)
RESET WATCHDOG
26.2
0.52
25.8
0.48
25.4
0.44
25.0 TEMPERATURE (°C)
0.40
Description
MAX6746 MAX6747 MAX6748- MAX6751 MAX6752 MAX6753 NAME FUNCTION Manual Reset Input. Pull manually reset device. Reset remains asserted reset timeout period after released. Reset Input. High-impedance input adjustable reset comparator. Connect RESET center point external resistor-divider threshold externally monitored voltage. Logic Input. SET0 selects watchdog window ratio disables watchdog timer. Table Watchdog Timeout Input. MAX6746-MAX6751: Connect capacitor between ground basic watchdog timeout period (tWD). Determine period formula 5.06 CSWT with seconds CSWT Farads. Extend basic watchdog timeout period using input. Connect ground disable watchdog timer function. MAX6752/MAX6753: Connect capacitor between ground slow watchdog timeout period (tWD2). Determine slow watchdog period formula: tWD2 0.65 CSWT with tWD2 seconds CSWT Farads. fast watchdog timeout period pinstrapping SET0 SET1 (Connect SET0 high SET1 disable watchdog timer function.) Table Reset Timeout Input. Connect capacitor from select reset timeout period. Determine period follows: 5.06 CSRT with seconds CSRT Farads. Ground
RESET
SET0
Reset Circuits with Capacitor-Adjustable Reset/Watchdog Timeout Delay MAX6746-MAX6753
Description (continued)
MAX6746 MAX6747 MAX6748- MAX6751 MAX6752 MAX6753 NAME FUNCTION
Watchdog Select Input. selects watchdog mode. Connect ground select normal mode watchdog timeout period. Connect select extended mode, multiplying basic timeout period factor 128. change state clears watchdog timer. Logic Input. SET1 selects watchdog window ratio disables watchdog timer. Table Watchdog Input. MAX6746-MAX6751: falling transition must occur within selected watchdog timeout period reset pulse occurs. watchdog timer clears when transition occurs whenever RESET asserted. Connect ground disable watchdog timer function.
SET1
MAX6752/MAX6753: falling transitions within periods shorter than tWD1 longer than tWD2 force RESET assert reset timeout period. watchdog timer begins count after RESET deasserted. watchdog timer clears when valid transition occurs whenever RESET asserted. Connect SET0 high SET1 disable watchdog timer function. Watchdog Timer section. Push/Pull Open-Drain Reset Output. RESET asserts whenever RESET drops below selected reset threshold voltage (VTH VRESET respectively) manual reset pulled low. RESET remains reset timeout period after reset conditions deasserted, then goes high. watchdog timer triggers reset pulse (tRP) whenever watchdog fault occurs. Supply Voltage. power-supply input input fixed threshold monitor.
RESET
Reset Circuits with Capacitor-Adjustable Reset/Watchdog Timeout Delay MAX6746-MAX6753
tWD1 (MIN) tWD1 (MAX) tWD2 (MIN) tWD2 (MAX)
GUARANTEED ASSERT RESET
GUARANTEED GUARANTEED ASSERT ASSERT RESET RESET *UNDETERMINED *UNDETERMINED
CONDITION
FAST FAULT
CONDITION
NORMAL OPERATION
CONDITION *UNDETERMINED STATES GENERATE FAULT CONDITION
SLOW FAULT
Figure MAX6752/MAX6753 Detailed Watchdog Input Timing Relationship
Detailed Description
MAX6746-MAX6753 assert reset signal whenever supply voltage RESET falls below reset threshold. reset output remains asserted reset timeout period after RESET rise above respective reset threshold. watchdog timer triggers reset pulse whenever watchdog fault occurs. reset watchdog delays adjustable with external capacitors. MAX6746-MAX6751 contain watchdog select input that extends watchdog timeout period 128x. MAX6752 MAX6753 have sophisticated watchdog timer that detects when processor running outside expected window operation. watchdog signals fault when input pulses arrive early (faster that selected tWD1 timeout period) late (slower than selected tWD2 timeout period) (see Figure
RESET guaranteed correct logic state greater than applications requiring valid reset logic when less than section Ensuring Valid RESET Output Down
RESET Threshold
MAX6748-MAX6751 monitor voltage RESET using adjustable reset threshold (VRESET with external resistor voltage-divider (Figure following formula calculate externally monitored voltage (VMON_TH): VMON_TH VRESET
VMON_TH
Reset Output
reset output typically connected reset input µP's reset input starts restarts known state. MAX6746-MAX6753 supervisory circuits provide reset logic prevent code-execution errors during power-up, power-down, brownout conditions (see theTypical Operating Circuit). RESET changes from high whenever monitored voltage, RESET and/or drop below reset threshold voltages. Once VRESET and/or exceeds respective reset threshold voltage(s), RESET remains reset timeout period, then goes high.
RESET
MAX6748 MAX6749 MAX6750 MAX6751
VMON_TH 1.235
Figure Calculating Monitored Threshold Voltage (VMON_TH)
Reset Circuits with Capacitor-Adjustable Reset/Watchdog Timeout Delay MAX6746-MAX6753
VMON_TH
guarantee RESET threshold accuracy timing performance. MAX6748 MAX6749 configured monitor voltage connecting VMON_TH.
Dual-Voltage Monitoring (MAX6750/MAX6751)
MAX6750 MAX6751 contain both factorytrimmed threshold voltages adjustable reset threshold input, allowing monitoring voltages, VMON_TH (see Figure RESET asserted when either voltages falls below respective threshold voltages.
RESET
MAX6748 MAX6749 MAX6750 MAX6751
Manual Reset (MAX6746/MAX6747)
Many µP-based products require manual reset capability, allow operator external logic circuitry initiate reset. manual reset input (MR) connect directly switch without external pullup resistor debouncing network. internally pulled and, therefore, left unconnected unused. designed reject fast, falling transients (typically 100ns pulses) must held minimum assert reset output. 0.1µF capacitor from ground provides additional noise immunity. After transitions from high, reset remains asserted duration reset timeout period. manual reset option easily implemented with MAX6748-MAX6751 connecting normally open momentary switch parallel with (Figure When switch closed, voltage RESET goes zero, initiating reset. Similar MAX6746/ MAX6747 manual reset, reset remains asserted while voltage RESET zero reset timeout period after switch opened.
Figure Adding External Manual Reset Function MAX6748-MAX6751
where VMON_TH desired reset threshold voltage reset input threshold (1.235V). Resistors have very high values minimize current consumption leakage currents. some conveniently high value (500k, example) calculate based desired reset threshold voltage, using following formula: (VMON_TH/VRESET MAX6748 MAX6749 monitor supply voltage, therefore, must greater than 1.5V
RESET NORMAL MODE (WDS GND)
Figure Watchdog Timing Diagram,
Reset Circuits with Capacitor-Adjustable Reset/Watchdog Timeout Delay MAX6746-MAX6753
RESET EXTENDED MODE (WDS VCC)
Figure Watchdog Timing Diagram,
Watchdog Timer
MAX6746-MAX6751 watchdog's circuit monitors µP's activity. does toggle watchdog input (WDI) within (user-selected), RESET asserts reset timeout period. internal watchdog timer cleared event that asserts RESET, falling transition (which detect pulses short 300ns) transition WDS. watchdog timer remains cleared while reset asserted; soon reset released, timer starts counting. MAX6746-MAX6751 feature modes watchdog operation: normal mode extended mode. normal mode (Figure 4a), watchdog timeout period determined value capacitor connected between ground. extended mode (Figure 4b), watchdog timeout period multiplied 128. example, extended mode, 0.1µF capacitor gives watchdog timeout period (see ExtendedMode Watchdog Timeout Period CSWT graph Typical Operating Characteristics). disable watchdog timer function, connect ground. MAX6752/MAX6753 MAX6752 MAX6753 have windowed watchdog timer that asserts RESET adjusted reset timeout period when watchdog recognizes fast watchdog fault (tWDI tWD1), slow watchdog fault (period tWD2). reset timeout period adjusted independently watchdog timeout period. slow watchdog period, tWD2 calculated follows: tWD2 0.65 CSWT with tWD2 seconds CSWT Farads. fast watchdog period, tWD1, selectable ratio from slow watchdog fault period (tWD2). Select fast watchdog period pinstrapping SET0 SET1,
Table Min/MAX Watchdog Setting
SET0 HIGH HIGH SET1 HIGH HIGH RATIO Watchdog Disabled
where HIGH GND. Table illustrates SET0 SET1 configuration window ratio tWD2/tWD1). example, CSWT 1500pF, SET0 SET1 low, then tWD2 975ms (typ) tWD1 122ms (typ). RESET asserts watchdog input falling edges close each other (faster than tWD1) (Figure falling edges that apart (slower than tWD2) (Figure 5b). Normal watchdog operation displayed (Figure 5c). internal watchdog timer cleared when falling edge detected within valid watchdog window when RESET deasserted. inputs ignored while RESET asserted. watchdog timer begins count after RESET deasserted. watchdog timer clears begins count after valid falling logic input. falling transitions within periods shorter than tWD1 longer than tWD2 force RESET assert reset timeout period. falling transitions within tWD1 window assert RESET. transitions between WD1(min) WD1(max) WD2(min) tWD2(max) guaranteed assert deassert RESET. guarantee that window watchdog does assert RESET, strobe between tWD1(max) tWD2(min). watchdog timer cleared when RESET asserted after falling transition after state change SET0 SET1. Disable watchdog timer connecting SET0 high SET1 low.
Reset Circuits with Capacitor-Adjustable Reset/Watchdog Timeout Delay MAX6746-MAX6753
tWDI tWD1 (MIN) 3.3V
RESET
MAX6747 MAX6749 MAX6451 MAX6753
FAST FAULT RESET tWDI tWD2 (MAX)
100k
RESET
RESET
Figure Interfacing Other Voltage Levels
SLOW FAULT tWD1 (MAX) tWDI tWD2 (MIN)
normal mode operation, calculate watchdog timeout capacitor follows: CSWT tWD/(5.06 106), with seconds CSRT Farads. MAX6752 MAX6753 windowed watchdog function, calculate slow watchdog period, tWD2 follows: tWD2 0.65 CSWT CSRT CSWT must low-leakage (<10nA) type capacitor. Ceramic capacitors recommended.
RESET
NORMAL OPERATION PULSING, OUTPUT STAYS HIGH)
Transient Immunity
Figure MAX6752/MAX6753 Window Watchdog Diagram
Applications Information
Selecting Reset/Watchdog Timeout Capacitor
reset timeout period adjustable accommodate variety applications. Adjust reset timeout period (tRP) connecting capacitor (CSRT) between ground. Calculate reset timeout capacitor folllows: CSRT (5.06 106), with seconds CSRT Farads. watchdog timeout period adjustable accommodate variety applications. With this feature, watchdog timeout optimized software execution. programmer determine often watchdog timer should serviced. Adjust watchdog timeout period (tWD) connecting specific value capacitor (CSWT) between GND.
addition issuing reset during power-up, power-down, brownout conditions, these supervisors relatively immune short-duration supply transients (glitches). Maximum Transient Duration Reset Threshold Overdrive graph Typical Operating Characteristics shows this relationship. area below curves graph region which these devices typically generate reset pulse. This graph generated using falling pulse applied starting above actual reset threshold (VTH) ending below magnitude indicated (reset-threshold overdrive). magnitude transient increases (farther below reset threshold), maximum allowable pulse width decreases. Typically, transient that goes 100mV below reset threshold lasts 50µs less does cause reset pulse issued.
Reset Circuits with Capacitor-Adjustable Reset/Watchdog Timeout Delay
Interfacing Other Voltages Logic Compatibility
open-drain RESET output used interface with other logic levels. shown Figure open-drain output connected voltages from Generally, pullup resistor connected RESET connects supply voltage that being monitored IC's pin. However, some systems open-drain output level-shift from monitored supply reset circuitry powered some other supply. Keep mind that supervisor's decreases towards does IC's ability sink current RESET. Also, with pullup resistor, RESET pulled high decays toward zero. voltage where this occurs depends pullup resistor value voltage which connected.
Ensuring Valid RESET Down (Push-Pull RESET)
When falls below RESET current sinking capabilities decline drastically. high-impedance CMOSlogic inputs connected RESET drift undetermined voltages. This presents problems most applications, since most other circuitry operate with below those applications where RESET must valid down pulldown resistor between RESET MAX6746/MAX6748/MAX6750/MAX6752 push/pull outputs. resistor sinks stray leakage currents, holding RESET (Figure value pulldown resistor critical; 100k large enough load RESET small enough pull RESET ground. external pulldown used with open-drain reset outputs.
MAX6746-MAX6753
MAX6746 MAX6748 MAX6450 MAX6752
RESET 100k
Figure Ensuring RESET Valid
Reset Circuits with Capacitor-Adjustable Reset/Watchdog Timeout Delay MAX6746-MAX6753
Table Reset Threshold Voltage Suffix -40°C +125°C)
SUFFIX 4.900 4.802 4.704 4.606 4.533 4.410 4.288 4.214 4.116 4.018 3.920 3.822 3.724 3.626 3.528 3.430 3.332 3.234 3.136 3.014 2.940 2.867 2.744 2.646 2.573 2.450 2.352 2.267 2.144 2.058 1.960 1.862 1.764 1.632 1.544 5.000 4.900 4.800 4.700 4.625 4.500 4.375 4.300 4.200 4.100 4.000 3.900 3.800 3.700 3.600 3.500 3.400 3.300 3.200 3.075 3.000 2.925 2.800 2.700 2.625 2.500 2.400 2.313 2.188 2.100 2.000 1.900 1.800 1.665 1.575 5.100 4.998 4.896 4.794 4.718 4.590 4.463 4.386 4.284 4.182 4.080 3.978 3.876 3.774 3.672 3.570 3.468 3.366 3.264 3.137 3.060 2.984 2.856 2.754 2.678 2.550 2.448 2.359 2.232 2.142 2.040 1.938 1.836 1.698 1.607
Table Standard Version Table
PART MAX6746KA16 MAX6746KA23 MAX6746KA26 MAX6746KA29 MAX6746KA46 MAX6747KA16 MAX6747KA23 MAX6747KA26 MAX6747KA29 MAX6747KA46 MAX6748KA MAX6749KA MAX6750KA16 MAX6750KA23 MAX6750KA26 MAX6750KA29 MAX6750KA46 MAX6751KA16 MAX6751KA23 MAX6751KA26 MAX6751KA29 MAX6751KA46 MAX6752KA16 MAX6752KA23 MAX6752KA26 MAX6752KA29 MAX6752KA46 MAX6753KA16 MAX6753KA23 MAX6753KA26 MAX6753KA29 MAX6753KA46 MARK AEDI AEDJ AEDK AALN AEDL AALO AEDM AEDN AEDO AEDP AALP AALQ AEDQ AALR AEDR AEDS AEDT AEDU AEDV AEDW AEDX AEDY AEDZ AEEA AALT AEEB AEEC AEED AEEE AEEF AEEG AEEH
Note: Standard versions shown bold. There 2500piece minimum order increment standard versions. Sample stock typically held standard versions only. Nonstandard versions require minimum order increment 10,000 pieces. Contact factory availability.
Reset Circuits with Capacitor-Adjustable Reset/Watchdog Timeout Delay MAX6746-MAX6753
Selector Guide
PART MAX6746 MAX6747 MAX6748 MAX6749 MAX6750 MAX6751 MAX6752 MAX6753 FIXED RESET THRESHOLD ADJUSTABLE RESET THRESHOLD STANDARD WATCHDOG TIMER MIN/MAX WATCHDOG TIMER PUSH/ PULL RESET OPEN-DRAIN RESET MANUAL RESET INPUT
Typical Operating Circuit
MAX6749 MAX4751
Configurations (continued)
VIEW
SET0
RESET SET1
RESET
MAX6752 MAX6753
MAX6748 MAX6749 MAX6750 MAX6751
RESET
RESET
SOT23-8
CSRT CSWT
Chip Information
TRANSISTOR COUNT: 1100 PROCESS: BiCMOS
NORMAL MODE EXTENDED MODE
Reset Circuits with Capacitor-Adjustable Reset/Watchdog Timeout Delay MAX6746-MAX6753
Package Information
(The package drawing(s) this data sheet reflect most current specifications. latest package outline information, www.maxim-ic.com/packages.)
SOT23, .EPS
REV.
DETAIL
SYMBOL
0.90 0.00 0.90 0.28 0.09 2.80 2.60 1.50 0.30
1.45 0.15 1.30 0.45 0.20 3.00 3.00 1.75 0.60 0.25 BSC. 0.65 BSC. 1.95 REF.
I.D. (SEE NOTE
SEATING PLANE
GAUGE PLANE
NOTE:
DIMENSIONS MILLIMETERS. FOOT LENGTH MEASURED FROM LEAD UPPER RADIUS HEEL LEAD PARALLEL SEATING PLANE PACKAGE OUTLINE EXCLUSIVE MOLD FLASH METAL BURR. PACKAGE OUTLINE INCLUSIVE SOLDER PLATING. COPLANARITY MILS. MAX. I.D. MIN. LOCATED ABOVE SOLDER THICKNESS MEASURED FLAT SECTION LEAD BETWEEN 0.08mm 0.15mm FROM LEAD TIP. MEETS JEDEC MO178.
PROPRIETARY INFORMATION TITLE:
DETAIL
PACKAGE OUTLINE, SOT-23, BODY
APPROVAL DOCUMENT CONTROL
21-0078
Maxim cannot assume responsibility circuitry other than circuitry entirely embodied Maxim product. circuit patent licenses implied. Maxim reserves right change circuitry specifications without notice time.
_Maxim Integrated Products, Gabriel Drive, Sunnyvale, 94086 408-737-7600 2003 Maxim Integrated Products Printed registered trademark Maxim Integrated Products.
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