3-Pin, Ultra-Low-Voltage, Low-Power Reset Circuits MAX6332/MAX633

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3-Pin, Ultra-Low-Voltage, Low-Power Reset Circuits MAX6332/MAX633

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19-1411; 12/98
3-Pin, Ultra-Low-Voltage, Low-Power Reset Circuits
MAX6332/MAX6333/MAX6334 microprocessor (µP) supervisory circuits monitor power supplies 1.8V 3.3V digital systems. They increase circuit reliability reduce cost eliminating external components adjustments. These devices perform single function: they assert reset signal whenever supply voltage declines below preset threshold, keeping asserted preset timeout period after risen above reset threshold. only difference among three devices their output. MAX6333 (push/pull) MAX6334 (open-drain) have active-low RESET output, while MAX6332 (push/pull) active-high RESET output. MAX6332/MAX6333 guaranteed correct state down 0.7V. MAX6334 guaranteed correct state down 1.0V. reset comparator these designed ignore fast transients VCC. Reset thresholds factorytrimmable between 1.6V 2.5V, approximately 100mV increments. There standard versions available (2,500 piece minimum-order quantity); contact factory availability nonstandard versions (10,000 piece minimum-order quantity). space-critical applications, MAX6332/MAX6333/MAX6334 come packaged 3-pin SOT23. 3.3µA Supply Current Precision Monitoring 1.8V 2.5V PowerSupply Voltages Reset Thresholds Available from 1.6V 2.5V, Approximately 100mV Increments Fully Specified over Temperature Three Power-On Reset Pulse Widths Available (1ms min, 20ms min, 100ms min) Cost Three Available Output Structures: Push/Pull RESET, Push/Pull RESET, Open-Drain RESET Guaranteed RESET/RESET Valid 0.7V (MAX6332/MAX6333) Power-Supply Transient Immunity External Components 3-Pin SOT23 Package Pin-Compatible with MAX809/MAX810 MAX6326/MAX6327/MAX6328
Features
Ultra-Low 0.7V Operating Supply Voltage
MAX6332/MAX6333/MAX6334
Applications
Pentium IIComputers Computers Controllers Intelligent Instruments Critical µP/µC Power Monitoring Portable/Battery-Powered Equipment Automotive
PART*
MAX6332UR_D_-T MAX6333UR_D_-T MAX6334UR_D_-T
Ordering Information
TEMP. RANGE -40°C +85°C -40°C +85°C -40°C +85°C PIN-PACKAGE SOT23-3 SOT23-3 SOT23-3
Typical Operating Circuit Configuration appear data sheet. Selector Guide appears data sheet.
These devices available factory-set reset thresholds from 1.6V 2.5V, approximately 0.1V increments. Choose desired reset threshold suffix from Table insert blanks following "UR" part number. Factory-programmed reset timeout periods also available. Insert number corresponding desired nominal reset timeout period min, 20ms min, 100ms min) blank following part number. There standard versions with required order increment 2500 pieces. Sample stock generally held standard versions only (see Selector Guide). Contact factory availability nonstandard versions (required order increment 10,000 pieces). devices available tape-and-reel only.
Pentium trademark Intel Corp.
Maxim Integrated Products
free samples latest literature: http://www.maxim-ic.com, phone 1-800-998-8800. small orders, phone 1-800-835-8769.
3-Pin, Ultra-Low-Voltage, Low-Power Reset Circuits MAX6332/MAX6333/MAX6334
ABSOLUTE MAXIMUM RATINGS
Terminal Voltage (with respect GND) .-0.3V Push/Pull RESET, RESET .-0.3V (VCC 0.3V) Open-Drain RESET .-0.3V Input Current (VCC) .20mA Output Current (RESET, RESET).20mA Rate Rise, .100V/µs Continuous Power Dissipation +70°C) SOT23-3 (derate 4mW/°C above +70°C) .320mW 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 full range, -40°C +85°C, unless otherwise noted. Typical values +25°C reset asserted.) PARAMETER SYMBOL CONDITIONS MAX6332/MAX6333 +85°C MAX6334 MAX6332/MAX6333 -40°C +85°C MAX6334 1.8V load 2.5V MAX633_UR_D_-T, Table falling 10V/ms MAX633_UR_D1-T MAX633_UR_D2-T MAX633_UR_D3-T Reset asserted Reset asserted Reset asserted Reset asserted ISINK 50µA, 1.0V ISINK 500µA, 1.8V ISOURCE 200µA, 1.8V ISOURCE 500µA, 2.7V ISOURCE 1µA, 1.0V ISOURCE 200µA, 1.8V ISINK 500µA, 1.8V ISINK 1.2mA, 2.7V 0.8VCC 0.8VCC 0.8VCC 0.8VCC +25°C -40°C +85°C 0.78 1.8% UNITS
Supply Voltage Range
Supply Current
1.8%
Reset Threshold
Falling Reset Delay Reset Active Timeout Period RESET Output Voltage (MAX6333/MAX6334) RESET Output High Voltage (MAX6333)
RESET Output Voltage (MAX6332) RESET Output Leakage Current (MAX6334)
Reset VTH, RESET deasserted asserted
3-Pin, Ultra-Low-Voltage, Low-Power Reset Circuits
Typical Operating Characteristics
(Reset asserted, +25°C, unless otherwise noted.)
NORMALIZED RESET TIMEOUT PERIOD TEMPERATURE
MAX6332/33/34 toc-1 MAX6332/33/34-2
MAX6332/MAX6333/MAX6334
SUPPLY CURRENT TEMPERATURE
(µA) TEMPERATURE (°C) RESET ASSERTED 1.8V 2.5V 1.050 NORMALIZED RESET TIMEOUT PERIOD 1.040 1.030 1.020 1.010 1.000 0.990 0.980 0.970 0.960 0.950
OUTPUT VOLTAGE SUPPLY VOLTAGE
OUTPUT VOLTAGE (mV) -40°C 1.00 1.50 2.00 2.50 3.00 +25°C +85°C 2.5V ISINK 500µA RESET ASSERTED
MAX6332/33/34 toc-6
2.2V
TEMPERATURE (°C)
OUTPUT VOLTAGE HIGH SUPPLY VOLTAGE
OUTPUT VOLTAGE HIGH (VCC VOH) (mV) +25°C 0.75 1.25 1.75 2.25 +85°C -40°C MAXIMUM TRANSIENT DURATION (µs) 2.2V ISOURCE 100µA RESET ASSERTED
MAX6332/33/34 toc-5
MAXIMUM TRANSIENT DURATION RESET COMPARATOR OVERDRIVE
MAX6332/33/34 toc-4
FALLING PROPAGATION DELAY TEMPERATURE
MAX6332/33/34 toc-3
RESET DOES OCCUR RESET OCCURS
PROPAGATION DELAY (µs) FALLING 10V/ms FALLING 1V/ms
1000 RESET COMPARATOR OVERDRIVE (mV)
TEMPERATURE (°C)
Description
MAX6332 MAX6333 MAX6334 NAME RESET Ground Active-Low Reset Output. RESET remains while below reset threshold reset timeout period (tRP) after rises above reset threshold. RESET MAX6334 open-drain. Active-High Reset Output. RESET remains high while below reset threshold reset timeout period (tRP) after rises above reset threshold. Supply Voltage (0.7V 5.5V) FUNCTION
RESET
3-Pin, Ultra-Low-Voltage, Low-Power Reset Circuits MAX6332/MAX6333/MAX6334
_Applications Information
Interfacing with Bidirectional Reset Pins
Since RESET output MAX6334 open-drain, this device interfaces easily with that have bidirectional reset pins, such Motorola 68HC11. Connecting supervisor's RESET output directly microcontroller's (µC's) RESET with single pull-up resistor allows either device assert reset (Figure
MOTOROLA 68HCXX RESET INPUT
MAX6334
RESET
Negative-Going Transients addition issuing reset during power-up, power-down, brownout conditions, these devices relatively immune short-duration, negative-going transients (glitches). Typical Operating Characteristics show Maximum Transient Duration Reset Comparator Overdrive graph. graph shows maximum pulse width that negative-going transient typically have without issuing reset signal. amplitude transient increases, maximum allowable pulse width decreases. Ensuring Valid Reset Output Down
When falls below approaches minimum operating voltage 0.7V, push/pull-structured reset sinking sourcing) capabilities decrease drastically. High-impedance CMOS-logic inputs connected RESET drift indeterminate voltages. This does present problem most cases, since most circuitry operate below MAX6333, where RESET must valid down adding pull-down resistor between RESET removes stray leakage currents, holding RESET (Figure 2a). pull-down resistor value critical; 100k large enough load RESET small enough pull low. MAX6332, where RESET must valid 100k pull-up resistor between RESET will hold RESET high when falls below 0.7V (Figure 2b). Since MAX6334 open-drain, active-low output, typically uses pull-up resistor. With this device, RESET will most likely maintain active condition, will drift non-active level pull-up resistor reduced sinking capability opendrain device. Therefore, this device recommended applications where RESET required valid down
Figure Interfacing with Bidirectional Reset Pins
100k*
MAX6333
RESET
MAX6332
RESET
100k
*ASSUMES HIGH-Z RESET INPUT
Figure Ensuring Reset Valid Down
Table Factory-Trimmed Reset Thresholds*
RESETTHRESHOLD SUFFIX MAX633_UR25D_ MAX633_UR24D_ MAX633_UR23D_ MAX633_UR22D_ MAX633_UR21D_ MAX633_UR20D_ MAX633_UR19D_ MAX633_UR18D_ MAX633_UR17D_ MAX633_UR16D_ +25°C 2.46 2.50 2.36 2.40 2.26 2.30 2.16 2.20 2.06 2.10 1.96 2.00 1.87 1.90 2.55 2.44 2.34 2.24 2.14 2.04 1.93 -40°C +85°C 2.43 2.33 2.23 2.13 2.04 1.94 1.84 1.75 1.65 1.55 2.58 2.47 2.37 2.27 2.16 2.06 1.96 1.85 1.75 1.65
1.77 1.80 1.83 1.67 1.70 1.73 1.57 1.60 1.63
Factory-trimmed reset thresholds available approximately 100mV increments, with ±1.8% room-temperature variance.
3-Pin, Ultra-Low-Voltage, Low-Power Reset Circuits
Configuration
VIEW
Typical Operating Circuit
MAX6332/MAX6333/MAX6334
MAX6332 MAX6333 MAX6334
MAX6332 MAX6333
RESET (RESET)
RESET INPUT
RESET (RESET)
SOT23-3
MAX6332
MAX6332
Selector Guide (standard versions*)
PART MAX6332UR23D3-T MAX6332UR22D3-T MAX6332UR20D3-T MAX6332UR18D3-T MAX6332UR16D3-T MAX6333UR23D3-T MAX6333UR22D3-T MAX6333UR20D3-T MAX6333UR18D3-T MAX6333UR16D3-T MAX6334UR23D3-T MAX6334UR22D3-T MAX6334UR20D3-T MAX6334UR18D3-T MAX6334UR16D3-T OUTPUT STAGE Push/Pull RESET Push/Pull RESET Push/Pull RESET Push/Pull RESET Push/Pull RESET Push/Pull RESET Push/Pull RESET Push/Pull RESET Push/Pull RESET Push/Pull RESET Open-Drain RESET Open-Drain RESET Open-Drain RESET Open-Drain RESET Open-Drain RESET NOMINAL 2.30 2.20 2.00 1.80 1.60 2.30 2.20 2.00 1.80 1.60 2.30 2.20 2.00 1.80 1.60 MINIMUM RESET TIMEOUT (ms) MARK FZDM FZCN FZDL FZCM FZCL FZCS FZCR FZCQ FZCP FZCO FZDO FZCV FZDN FZCU FZCT
Sample stock generally held standard versions.
3-Pin, Ultra-Low-Voltage, Low-Power Reset Circuits MAX6332/MAX6333/MAX6334
Chip Information
TRANSISTOR COUNT:
Package Information
SOTPO3L.EPS
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 1998 Maxim Integrated Products Printed registered trademark Maxim Integrated Products.

3-Pin, Ultra-Low-Voltage, Low-Power Reset Circuits MAX6332/MAX633

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