4-Pin, Ultra-Low-Voltage, Low-Power Reset Circuits with Manual Reset

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4-Pin, Ultra-Low-Voltage, Low-Power Reset Circuits with Manual Reset

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19-1412; 12/98
4-Pin, Ultra-Low-Voltage, Low-Power Reset Circuits with Manual Reset
MAX6335/MAX6336/MAX6337 microprocessor (µP) supervisory circuits monitor power supplies 1.8V 3.3V digital systems. They increase circuit reliability reduce cost eliminating external components adjustments. They also feature debounced manual-reset input. These devices perform single function: they assert reset signal whenever supply voltage declines below preset threshold whenever manual reset asserted. Reset remains asserted preset timeout period after risen above reset threshold after manual reset deasserted. only difference among three devices their output. MAX6336 (push/pull) MAX6337 (open-drain) have activelow RESET output, while MAX6335 (push/pull) active-high RESET output. MAX6335/MAX6336 guaranteed correct state down 0.7V. MAX6337 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 (2500 piece minimum-order quantity); contact factory availability nonstandard versions (10,000 piece minimum-order quantity). space-critical applications, MAX6335/MAX6336/MAX6337 come packaged 4-pin SOT143. 3.3µA Supply Current Precision Monitoring 1.8V 2.5V PowerSupply Voltages Reset Thresholds Available from 1.6V 2.5V, Approximately 100mV Increments Debounced Manual Reset 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 (MAX6335/MAX6336) Power-Supply Transient Immunity External Components 4-Pin SOT143 Package Pin-Compatible with MAX811/MAX812 MAX6314/MAX6315
Features
Ultra-Low 0.7V Operating Supply Voltage
MAX6335/MAX6336/MAX6337
Applications
Pentium IIComputers Computers Controllers Intelligent Instruments Critical µP/µC Power Monitoring Portable/Battery-Powered Equipment Automotive
PART*
MAX6335US_D_-T MAX6336US_D_-T MAX6337US_D_-T
Ordering Information
TEMP. RANGE -40°C +85°C -40°C +85°C -40°C +85°C PIN-PACKAGE SOT143 SOT143 SOT143
Typical Operating Circuit Configuration appear data sheet. Selector Guide appears data sheet. Pentium trademark Intel Corp.
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 "US" 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.
Maxim Integrated Products
free samples latest literature: http://www.maxim-ic.com, phone 1-800-998-8800. small orders, phone 1-800-835-8769.
4-Pin, Ultra-Low-Voltage, Low-Power Reset Circuits with Manual Reset MAX6335/MAX6336/MAX6337
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) SOT143 (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, unconnected, -40°C +85°C, unless otherwise noted. Typical values +25°C reset asserted.) PARAMETER SYMBOL CONDITIONS +85°C Supply Voltage Range -40°C +85°C Supply Current load MAX6335/MAX6336 MAX6337 MAX6335/MAX6336 MAX6337 0.78 1.8% 0.8VCC 0.8VCC 0.8VCC 0.8VCC 2.6V 2.6V 0.3VCC VTH, RESET deasserted 0.42 0.7VCC 1.8% UNITS
1.8V 2.5V
+25°C -40°C +85°C
Reset Threshold
MAX633_US_ _D_-T, Table falling 10V/ms MAX633_US_ _D1-T
Falling Reset Delay Reset Active Timeout Period RESET Output Voltage (MAX6336/MAX6337) RESET Output High Voltage (MAX6336)
MAX633_US_ _D2-T MAX633_US_ _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
RESET Output Voltage (MAX6335) Minimum Pulse Width Glitch Immunity Reset Delay Threshold Pull-Up Resistance RESET Output Leakage Current (MAX6337)
4-Pin, Ultra-Low-Voltage, Low-Power Reset Circuits with Manual Reset
_Typical Operating Characteristics
(Reset asserted, +25°C, unless otherwise noted.)
MAX6335/MAX6336/MAX6337
SUPPLY CURRENT TEMPERATURE
MAX6335/36/37 toc-1
NORMALIZED RESET TIMEOUT PERIOD TEMPERATURE
NORMALIZED RESET TIMEOUT PERIOD 1.040 1.030 1.020 1.010 1.000 0.990 0.980 0.970 0.960 0.950 2.2V
MAX6335/36/37-2
OUTPUT VOLTAGE SUPPLY VOLTAGE
OUTPUT VOLTAGE (mV) -40°C 0.50 1.00 1.50 2.00 2.50 3.00 +25°C +85°C 2.5V ISINK 500µA RESET ASSERTED
MAX6335/36/37 toc-3
(µA) RESET ASSERTED 1.8V 2.5V
1.050
TEMPERATURE (°C)
TEMPERATURE (°C)
OUTPUT VOLTAGE HIGH SUPPLY VOLTAGE
OUTPUT VOLTAGE HIGH (VCC VOH) (mV) +85°C 0.75 1.25 1.75 2.25 +25°C -40°C MAXIMUM TRANSIENT DURATION (µs) 2.2V ISOURCE 100µA RESET ASSERTED
MAX6335/36/37 toc-4
MAXIMUM TRANSIENT DURATION RESET COMPARATOR OVERDRIVE
MAX6335/36/37 toc-5
FALLING PROPAGATION DELAY TEMPERATURE
MAX6332/33/34 toc-6
RESET DOES OCCUR RESET OCCURS
PROPAGATION DELAY (µs) FALLING 10V/ms FALLING 1V/ms
1000 RESET COMPARATOR OVERDRIVE (mV)
TEMPERATURE (°C)
4-Pin, Ultra-Low-Voltage, Low-Power Reset Circuits with Manual Reset MAX6335/MAX6336/MAX6337
Description
MAX6335 MAX6336 MAX6337 NAME Ground Active-Low Reset Output. RESET remains while below reset threshold, asserted reset timeout period (tRP) after rises above reset threshold, deasserted. RESET MAX6337 open-drain. Active-High Reset Output. RESET remains high while below reset threshold, asserted reset timeout period (tRP) after rises above reset threshold, deasserted. RESET also asserts when low. Manual-Reset Input. logic asserts reset. Reset remains asserted long low, reset timeout period (tRP) after goes high. Leave unconnected connect used. Supply Voltage (0.7V 5.5V) FUNCTION
RESET
RESET
Applications Information
Manual-Reset Inputs
Many µP-based products require manual-reset capability, allowing operator, test technician, external logic circuitry initiate reset. logic asserts reset. Reset remains asserted while low, reset active timeout period after returns high. internal pull-up resistor, left unconnected used. Connect normally open momentary switch from create manual-reset function; external debounce circuitry required.
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 MAX6336, where RESET must valid down adding pull-down resistor between RESET removes stray leakage currents, holding RESET
Interfacing with Bidirectional Reset Pins
Since RESET output MAX6337 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
MAX6337
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
RESET
Figure Interfacing with Bidirectional Reset Pins
4-Pin, Ultra-Low-Voltage, Low-Power Reset Circuits with Manual Reset
Table Factory-Trimmed Reset Thresholds*
RESET THRESHOLD SUFFIX MAX633_US25D_ MAX633_US24D_ 100k MAX633_US23D_ MAX633_US22D_ MAX633_US21D_ +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
MAX6335/MAX6336/MAX6337
MAX6336
RESET
MAX633_US20D_ MAX633_US19D_ 100k* MAX633_US18D_ MAX633_US17D_ MAX633_US16D_
1.77 1.80 1.83 1.67 1.70 1.73 1.57 1.60 1.63
MAX6335
RESET
Factory-trimmed reset thresholds available approximately 100mV increments, with ±1.8% room-temperature variance.
*ASSUMES HIGH-Z RESET INPUT
Figure Ensuring Reset Valid down
(Figure 2a). pull-down resistor value critical; 100k large enough load RESET, small enough pull low. MAX6335, where RESET must valid 100k pull-up resistor between RESET will hold RESET high when falls below 0.7V (Figure 2b). Since MAX6337 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
4-Pin, Ultra-Low-Voltage, Low-Power Reset Circuits with Manual Reset MAX6335/MAX6336/MAX6337
Selector Guide (standard versions*)
PART MAX6335US23D3-T MAX6335US22D3-T MAX6335US20D3-T MAX6335US18D3-T MAX6335US16D3-T MAX6336US23D3-T MAX6336US22D3-T MAX6336US20D3-T MAX6336US18D3-T MAX6336US16D3-T MAX6337US23D3-T MAX6337US22D3-T MAX6337US20D3-T MAX6337US18D3-T MAX6337US16D3-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 KABQ KAAR KABP KAAQ KAAP KAAW KAAV KAAU KAAT KAAS KABS KAAZ KABR KAAY KAAX
Sample stock generally held standard versions.
Configuration
VIEW
Typical Operating Circuit
MAX6335 MAX6336 MAX6337
MAX6335 MAX6336
RESET (RESET) RESET
RESET (RESET)
SOT143
MAX6335
PUSHBUTTON SWITCH MAX6335
4-Pin, Ultra-Low-Voltage, Low-Power Reset Circuits with Manual Reset
Chip Information
TRANSISTOR COUNT:
MAX6335/MAX6336/MAX6337
Package Information
SOT1434.EPS
4-Pin, Ultra-Low-Voltage, Low-Power Reset Circuits with Manual Reset MAX6335/MAX6336/MAX6337
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 1998 Maxim Integrated Products Printed registered trademark Maxim Integrated Products.

4-Pin, Ultra-Low-Voltage, Low-Power Reset Circuits with Manual Reset

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