MAX6806/MAX6807/MAX6808 precision voltage detectors ideal accurate mon

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MAX6806/MAX6807/MAX6808 precision voltage detectors ideal accurate mon

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MAX6806/MAX6807/MAX6808 precision voltage detectors ideal accurate monitoring power supplies digital systems. They provide circuit reliability reduce total cost eliminating external components adjustments. MAX6806/MAX6807/MAX6808 assert reset signal whenever supply voltage (VCC) falls below factorypreset, accurate threshold. Internal hysteresis ensures stable switching. MAX6806/MAX6807/ MAX6808 available 4.6V 2.6V thresholds (2.3V also available MAX6806 only). MAX6806 features active-low, push-pull RESET output; MAX6807 features active-high, push-pull RESET output; MAX6808 features active-low, open-drain RESET output. RESET valid down (MAX6806/ MAX6808), RESET (MAX6807) guaranteed down 1.2V. MAX6806/MAX6807/MAX6808 available 3-pin SC70, 3-pin SOT23, 4-pin SOT143 packages. SOT143 package includes manual-reset input.
Features
Preset Reset Thresholds: 4.6V 2.6V (2.3V also available MAX6806 only) Accurate Reset Thresholds Reset Output Available Active-Low (MAX6806), Active-High (MAX6807), Open-Drain (MAX6808) Versions Immune Power-Supply Transients RESET Valid 1.0V (MAX6806/MAX6808) 35µA Supply Current External Components Manual Reset Available with 4-Pin SOT143 Package Miniature 3-Pin SC70, 3-Pin SOT23, 4-Pin SOT143 Packages
MAX6806/MAX6807/MAX6808
Ordering Information
PART MAX6806XR_ MAX6806UR_ MAX6806US_ MAX6807XR_ MAX6807UR_ MAX6807US_ MAX6808XR_ MAX6808UR_ MAX6808US_ TEMP. RANGE -40°C +85°C -40°C +85°C -40°C +85°C -40°C +85°C -40°C +85°C -40°C +85°C -40°C +85°C -40°C +85°C -40°C +85°C PIN-PACKAGE SC70 SOT23 SOT143 SC70 SOT23 SOT143 SC70 SOT23 SOT143
Applications
Computers Controllers Intelligent Instruments Critical Power Monitoring Portable/Battery-Powered Equipment Automotive Bar-Code Scanners
Typical Operating Circuit Configurations appear data sheet.
devices available tape-and-reel only, 2500 piece minimum order quantity. Note: Insert desired number from Selector Guide into blank complete part number. Also Selector Guide mark.
Selector Guide
PART RESET OUTPUT MARK FZDP FZDQ FZDR KABT KABU KABV NOMINAL VTH-
MAX6806UR46-T MAX6806UR26-T MAX6806UR23-T Active-Low, Push-Pull MAX6806US46-T MAX6806US26-T MAX6806US23-T Other reset thresholds available. Contact factory availability.
Selector Guide continued data sheet.
Maxim Integrated Products
free samples latest literature: http://www.maxim-ic.com, phone 1-800-998-8800. small orders, phone 1-800-835-8769.
Voltage Detectors MAX6806/MAX6807/MAX6808
ABSOLUTE MAXIMUM RATINGS
.-0.3V +6.0V RESET, RESET (MAX6806/MAX6807) .-0.3V (VCC 0.3V) RESET (MAX6808).-0.3V 6.0V (SOT143 package only) .-0.3V 6.0V Input Current, .±20mA Output Current, RESET, RESET .±20mA Rate Rise, .100V/µs Continuous Power Dissipation +70°C) SOT23, SOT143 (derate 4mW/°C above +70°C) .320mW SC70 (derate 2.17mW/°C above +70°C) .174mW Operating Temperature Range .-40°C +85°C Storage Temperature Range .-65°C +160°C Lead Temperature (soldering, 10sec) .+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 +5V, -40°C +85°C, unless otherwise noted. Typical values +25°C.) (Note PARAMETER Supply Voltage Range Supply Current SYMBOL CONDITIONS +70°C -40°C +85°C +3.6V, load +5.5V, load MAX680_ Reset Threshold VTHTA +25°C, falling +25°C, Figure ISINK 20µA, 1.0V ISINK 1.0mA, 2.0V ISOURCE 2.0mA, 5.0V (MAX6806 only) 5.5V, RESET deasserted (MAX6808 only) ISOURCE 20µA, 1.2V ISOURCE 400µA, 2.0V ISINK 3.2mA, 5.0V falling 1mV/µs VTH+ 0.7VCC 0.8VCC 0.8VCC ppm/°C 0.8VCC MAX680_ MAX680_ 4.508 2.548 2.254 4.60 2.60 2.30 0.02 VTHTYP 4.692 2.652 2.346 0.03 VTH0.3 UNITS
Reset Threshold Hysteresis
VHYST
RESET Output Voltage (MAX6806/MAX6808)
RESET Output Leakage Current RESET Output Voltage (MAX6807) Reset Delay (Note Reset Threshold Tempco Pull-Down Resistance Input Threshold
Note1: devices 100% production tested +25°C, guaranteed design TMIN TMAX, specified. Note RESET output MAX6806/MAX6808, RESET output MAX6807.
Typical Operating Characteristics
+25°C, unless otherwise noted.)
POWER-DOWN RESET DELAY TEMPERATURE
RESET DELAY (µs) 1.0V -30-15 120135 TEMPERATURE (°C) TEMPERATURE (°C) VTH- 100mV FALLING 1mV/µS
MAX6806/7/8toc02 MAX6806/7/8-01
MAX6806/MAX6807/MAX6808
SUPPLY CURRENT TEMPERATURE
SUPPLY CURRENT (µA) 1.8V 3.3V 5.0V
POWER-UP RESET DELAY TEMPERATURE
VTH+ DELAY TIME (µs) TEMPERATURE (°C) 200mV 50mV 100mV
MAX6806/7/8-03
NORMALIZED RESET THRESHOLD TEMPERATURE
1.0080 NORMALIZED RESET THRESHOLD 1.0060 1.0040 1.0020 1.0000 0.9980 0.9960 0.9940 0.9920 0.9900 TEMPERATURE (°C) FALLING (VTH-) RISING (VTH+)
MAX6806/7/8-04
1.0100
Description
NAME SOT23/SC70 SOT143 RESET RESET Active-Low Reset Output (MAX6806/MAX6808). RESET remains while below reset-threshold voltage while held high. Active-High Reset Output (MAX6807). RESET remains high while below reset-threshold voltage while held high. Ground Supply Voltage Input Active-High Manual Reset Input. Internal resistor GND. FUNCTION
Voltage Detectors MAX6806/MAX6807/MAX6808
_Detailed Description
Reset Output
MAX6806 voltage detector features active-low, push-pull RESET output, while MAX6807 features active-high, push-pull RESET output. Unlike microprocessor (µP) supervisory circuits that offer reset timeout period, MAX6806 MAX6807 RESET goes high RESET goes virtually immediately once exceeds reset threshold. brownout occurs (VCC falls below reset threshold), RESET goes RESET goes high. RESET guaranteed logic RESET guaranteed logic high 1.2V. MAX6808 features active-low, open-drain RESET output. output sinks current when falls below reset threshold. Connect pull-up resistor from RESET supply voltage (Figure Select resistor value large enough provide logic small enough provide logic high while supplying input leakage currents connected RESET line. 100k resistor sufficient applications driving high-impedance loads. manual reset input (MR, 4-pin SOT143 package) also initiate reset (see Manual Reset Input section).
Manual Reset Input
Many applications require manual-reset capabilities, allowing operator, test technician, external logic circuitry initiate reset. logic high asserts reset remains asserted while high. This input pull-down resistor, input left unconnected used. Connect normally open momentary switch from create manualreset function. driven from long cables device used noisy environment, connecting 0.1µF capacitor from ground provides noise immunity.
Hysteresis
MAX6806/MAX6807/MAX6808 feature internal hysteresis that creates trip points: rising supply voltage falling supply voltage (Figure hysteresis prevents output from oscillating (chattering) when near reset threshold.
Reset Threshold Accuracy
MAX6806/MAX6807/MAX6808 ideal systems using ±5%, ±5%, 2.5V power supply with specified ±10%, ±10%, 2.5V ±10%, respectively. reset guaranteed assert after power supply falls regulation, before power drops below minimum specified operating voltage range system ICs.
+3.3V
+5.0V VTH+ HYST VHYST VTH+ VTH-
VTH-
100k
MAX6808
SYSTEM RESET (MAX6806/MAX6808)
RESET
RESET (MAX6807)
Figure MAX6808 open-drain RESET output allows with multiple supplies.
Figure Input Output Waveforms with Varied
Applications Information
Negative-Going Transients addition asserting reset signal during power-up, power-down, brown-out conditions, MAX6806/ MAX6807/MAX6808 immune short-duration, negative-going transients. Figure displays typical transient durations resetcomparator overdrive which MAX6806/MAX6807/ MAX6808 generate reset pulse. graph generated using negative-going pulse applied VCC, starting 0.5V above actual reset threshold ending below magnitude indicated (reset-comparator overdrive). graph indicates maximum pulse width negative-going transient have without causing reset pulse. magnitude transient increases (goes further below reset threshold), maximum allowable pulse width decreases. 0.1µF capacitor mounted close possible provides additional transient immunity. Ensuring Valid Reset Output Down Ground
When falls below MAX6806/MAX6808 RESET output longer sinks current-it becomes open circuit. Therefore, high-impedance CMOS logic inputs connected RESET drift undetermined voltages. This presents problem most applications, since most circuitry inoperative when below applications where RESET must valid down ground, pull-down resistor RESET stray leakage currents flow ground, holding RESET (Figure Select large enough load RESET small enough pull RESET ground. most applications, 100k will load RESET will pull RESET ground. Similarly, RESET (MAX6807) must valid below 1.2V, pull-up resistor RESET.
MAX6806/MAX6807/MAX6808
+25°C MAXIMUM TRANSIENT DURATION (µs) MAX680 1000 RESET COMPARATOR OVERDRIVE, VTH- (mV) 100k RESET RESET 100k
MAX6806
MAX6807
Figure Maximum Transient Duration without Causing Reset Pulse Reset Comparator Overdrive
Figure RESET RESET Valid Ground Circuit
Voltage Detectors MAX6806/MAX6807/MAX6808
Interfacing with Bidirectional Reset Pins
with bidirectional reset pins (such Motorola 68HC11 series) contend with push-pull RESET outputs, resulting indeterminate logic levels. MAX6808 with open-drain RESET when interfacing this type controller.
4.7k
MAX6808
RESET
RESET
Figure Interfacing with Bidirectional Reset
Selector Guide (continued)
PART* MAX6806XR46-T MAX6806XR26-T MAX6806XR23-T MAX6807UR46-T MAX6807UR26-T MAX6807US46-T MAX6807US26-T MAX6807XR46-T MAX6807XR26-T MAX6808UR46-T MAX6808UR26-T MAX6808US46-T MAX6808US26-T MAX6808XR46-T MAX6808XR26-T Other reset thresholds available. Contact factory availability. RESET OUTPUT MARK FZDS FZDT KABW KABX FZDU FZDV KABY KABZ NOMINAL VTH-
Active-Low, Push-Pull
Active-High, Push-Pull
Active-Low, Open-Drain
Configurations
VIEW
MAX6806/MAX6807/MAX6808
(RESET)/RESET (RESET)/RESET
MAX6806 MAX6807 MAX6808
MAX6806 MAX6807 MAX6808
SOT23/SC70 SOT143
MAX6807
Typical Operating Circuit
MAX6806 MAX6807 MAX6808
(RESET)/RESET RESET INPUT
MAX6807
_Chip Information
TRANSISTOR COUNT:
Voltage Detectors MAX6806/MAX6807/MAX6808
Package Information
SC70, 3L.EPS
Package Information (continued)
SOTPO3L.EPS
MAX6806/MAX6807/MAX6808
Voltage Detectors MAX6806/MAX6807/MAX6808
Package Information (continued)
SOT1434.EPS
NOTES
MAX6806/MAX6807/MAX6808
Voltage Detectors MAX6806/MAX6807/MAX6808
NOTES
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 1999 Maxim Integrated Products Printed registered trademark Maxim Integrated Products.

MAX6806/MAX6807/MAX6808 precision voltage detectors ideal accurate mon

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