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19-1411; Rev 2; 12/05
3-Pin, Ultra-Low-Voltage, Low-Power P Reset Circuits
General Description
The MAX6332/MAX6333/MAX6334 microprocessor (P) supervisory circuits monitor the power supplies in 1.8V to 3.3V P and digital systems. They increase circuit reliability and reduce cost by eliminating external components and adjustments. These devices perform a single function: they assert a reset signal whenever the VCC supply voltage declines below a preset threshold, keeping it asserted for a preset timeout period after VCC has risen above the reset threshold. The only difference among the three devices is their output. The MAX6333 (push/pull) and MAX6334 (open-drain) have an active-low RESET output, while the MAX6332 (push/pull) has an active-high RESET output. The MAX6332/MAX6333 are guaranteed to be in the correct state for VCC down to 0.7V. The MAX6334 is guaranteed to be in the correct state for VCC down to 1.0V. The reset comparator in these ICs is designed to ignore fast transients on VCC. Reset thresholds are factorytrimmable between 1.6V and 2.5V, in approximately 100mV increments. There are 15 standard versions available (2,500 piece minimum-order quantity); contact the factory for availability of nonstandard versions (10,000 piece minimum-order quantity). For space-critical applications, the MAX6332/MAX6333/MAX6334 come packaged in a 3-pin SOT23. Low 3.3A Supply Current Precision Monitoring of 1.8V and 2.5V PowerSupply Voltages Reset Thresholds Available from 1.6V to 2.5V, in Approximately 100mV Increments Fully Specified over Temperature Three Power-On Reset Pulse Widths Available (1ms min, 20ms min, 100ms min) Low Cost Three Available Output Structures: Push/Pull RESET, Push/Pull RESET, Open-Drain RESET Guaranteed RESET/RESET Valid to VCC = 0.7V (MAX6332/MAX6333) Power-Supply Transient Immunity No External Components 3-Pin SOT23 Package Pin Compatible with MAX809/MAX810 and MAX6326/MAX6327/MAX6328
Features
Ultra-Low 0.7V Operating Supply Voltage
MAX6332/MAX6333/MAX6334
Applications
Pentium IITM Computers Computers Controllers Intelligent Instruments Critical P/C Power Monitoring Portable/Battery-Powered Equipment Automotive
PART*
MAX6332UR__D_-T MAX6333UR__D_-T MAX6334UR__D_-T
Ordering Information
TEMP. RANGE -40C to +125C -40C to +125C -40C to +125C PIN-PACKAGE 3 SOT23-3 3 SOT23-3 3 SOT23-3
Typical Operating Circuit and Pin Configuration appear at end of data sheet. Selector Guide appears at end of data sheet.
* These devices are available in factory-set VCC reset thresholds from 1.6V to 2.5V, in approximately 0.1V increments. Choose the desired reset threshold suffix from Table 1 and insert it in the blanks following "UR" in the part number. Factory-programmed reset timeout periods are also available. Insert the number corresponding to the desired nominal reset timeout period (1 = 1ms min, 2 = 20ms min, 3 = 100ms min) in the blank following "D" in the part number. There are 15 standard versions with a required order increment of 2500 pieces. Sample stock is generally held on the standard versions only (see Selector Guide). Contact the factory for availability of nonstandard versions (required order increment is 10,000 pieces). All devices available in tape-and-reel only. Devices are available in both leaded and lead-free packaging. Specify lead-free by replacing "-T" with "+T" when ordering.
Pentium II is a trademark of Intel Corp.
________________________________________________________________ Maxim Integrated Products
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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.
3-Pin, Ultra-Low-Voltage, Low-Power P Reset Circuits MAX6332/MAX6333/MAX6334
ABSOLUTE MAXIMUM RATINGS
Terminal Voltage (with respect to GND) VCC ......................................................................-0.3V to +6V Push/Pull RESET, RESET .......................-0.3V to (VCC + 0.3V) Open-Drain RESET ..............................................-0.3V to +6V Input Current (VCC) .............................................................20mA Output Current (RESET, RESET).........................................20mA Continuous Power Dissipation (TA = +70C) SOT23-3 (derate 4mW/C above +70C) ....................320mW Operating Temperature Range .........................-40C to +125C Storage Temperature Range .............................-65C to +160C Lead Temperature (soldering, 10s) .................................+300C
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.
ELECTRICAL CHARACTERISTICS
(VCC = full range, TA = -40C to +125C, unless otherwise noted. Typical values are at TA = +25C and VCC = 3V, reset not assertPARAMETER SYMBOL CONDITIONS MAX6332/MAX6333 TA = 0C to +85C MAX6334 TA = -40C to +85C TA = -40C to +125C Supply Current ICC No load MAX6332/MAX6333 MAX6334 MAX6332/MAX6333 MAX6334 VCC = 1.8V VCC = 2.5V TA = +25C TA = -40C to +125C VTH 1.8% VTH 3% 1 20 100 MIN 0.7 1.0 0.78 1.2 1.2 3.0 3.3 VTH VTH 24 1.5 30 150 TYP MAX 5.5 5.5 5.5 5.5 5.5 6.0 7.0 VTH + 1.8% VTH + 3% 2 40 200 0.4 0.3 0.8VCC 0.8VCC 0.8VCC 0.8VCC 0.3 0.3 0.5 A V UNITS
Supply Voltage Range
VCC
Reset Threshold
VTH
MAX633_UR__D_-T, Table 1 VCC falling at 10V/ms MAX633_UR__D1-T MAX633_UR__D2-T MAX633_UR__D3-T Reset asserted Reset not asserted Reset asserted Reset not asserted
V
VCC Falling Reset Delay Reset Active Timeout Period RESET Output Low Voltage (MAX6333/MAX6334) RESET Output High Voltage (MAX6333)
s ms
tRP
VOL VOH VOH
ISINK = 50A, VCC 1.0V ISINK = 500A, VCC 1.8V ISOURCE = 200A, VCC 1.8V ISOURCE = 500A, VCC 2.7V ISOURCE = 1A, VCC 1.0V ISOURCE = 200A, VCC 1.8V ISINK = 500A, VCC 1.8V ISINK = 1.2mA, VCC 2.7V
V V V V A
RESET Output Voltage (MAX6332) VOL RESET Output Leakage Current (MAX6334)
VCC > VTH, RESET deasserted
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3-Pin, Ultra-Low-Voltage, Low-Power P Reset Circuits
Typical Operating Characteristics
(Reset not asserted, TA = +25C, unless otherwise noted.)
NORMALIZED RESET TIMEOUT PERIOD vs. TEMPERATURE
MAX6332/33/34 toc-1 MAX6332/33/34-2
MAX6332/MAX6333/MAX6334
SUPPLY CURRENT vs. TEMPERATURE
4.0 3.8 3.6 3.4 ICC (A) 3.2 3.0 2.8 2.6 2.4 2.2 2.0 -60 -40 -20 0 20 40 60 80 100 TEMPERATURE (C) RESET NOT ASSERTED VCC = 1.8V VCC = 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 LOW vs. SUPPLY VOLTAGE
70 OUTPUT VOLTAGE LOW (mV) 60 50 40 30 20 TA = -40C 10 0 0.5 1.00 1.50 2.00 2.50 3.00 TA = +25C TA = +85C VTH = 2.5V ISINK = 500A RESET ASSERTED
MAX6332/33/34 toc-6
80
VTH = 2.2V
-60
-40
-20
0
20
40
60
80
100
TEMPERATURE (C)
VCC (V)
OUTPUT VOLTAGE HIGH vs. SUPPLY VOLTAGE
OUTPUT VOLTAGE HIGH (VCC - VOH) (mV) 140 120 100 80 60 TA = +25C 40 20 0 0.5 0.75 1.0 1.25 1.5 1.75 2.0 2.25 2.5 VCC (V) TA = +85C 0 TA = -40C MAXIMUM TRANSIENT DURATION (s) VTH = 2.2V ISOURCE = 100A RESET ASSERTED
MAX6332/33/34 toc-5
MAXIMUM TRANSIENT DURATION vs. RESET COMPARATOR OVERDRIVE
MAX6332/33/34 toc-4
VCC FALLING PROPAGATION DELAY vs. TEMPERATURE
MAX6332/33/34 toc-3
160
600 500 400 300 200 100 RESET DOES NOT OCCUR RESET OCCURS
80 70 PROPAGATION DELAY (s) 60 50 40 30 20 10 VCC FALLING AT 10V/ms VCC FALLING AT 1V/ms
0.1
100 1000 RESET COMPARATOR OVERDRIVE (mV)
1
10
-60
-40
-20
0
20
40
60
80
100
TEMPERATURE (C)
Pin Description
PIN MAX6332 1 -- MAX6333 MAX6334 1 2 NAME GND RESET Ground Active-Low Reset Output. RESET remains low while VCC is below the reset threshold and for a reset timeout period (tRP) after VCC rises above the reset threshold. RESET on the MAX6334 is open-drain. Active-High Reset Output. RESET remains high while VCC is below the reset threshold and for a reset timeout period (tRP) after VCC rises above the reset threshold. Supply Voltage (0.7V to 5.5V) FUNCTION
2 3
-- 3
RESET VCC
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3-Pin, Ultra-Low-Voltage, Low-Power P Reset Circuits MAX6332/MAX6333/MAX6334
______________Applications Information
Interfacing to Ps with Bidirectional Reset Pins
Since the RESET output on the MAX6334 is open-drain, this device interfaces easily with Ps that have bidirectional reset pins, such as the Motorola 68HC11. Connecting the P supervisor's RESET output directly to the microcontroller's (C's) RESET pin with a single pull-up resistor allows either device to assert reset (Figure 1).
VCC VCC VCC P MOTOROLA 68HCXX RESET INPUT GND
MAX6334
RESET GND
Negative-Going VCC Transients In addition to issuing a reset to the P during power-up, power-down, and brownout conditions, these devices are relatively immune to short-duration, negative-going VCC transients (glitches). The Typical Operating Characteristics show the Maximum Transient Duration vs. Reset Comparator Overdrive graph. The graph shows the maximum pulse width that a negative-going VCC transient may typically have without issuing a reset signal. As the amplitude of the transient increases, the maximum allowable pulse width decreases. Ensuring a Valid Reset Output Down to VCC = 0
When VCC falls below 1V and approaches the minimum operating voltage of 0.7V, push/pull-structured reset sinking (or sourcing) capabilities decrease drastically. High-impedance CMOS-logic inputs connected to the RESET pin can drift to indeterminate voltages. This does not present a problem in most cases, since most Ps and circuitry do not operate at VCC below 1V. For the MAX6333, where RESET must be valid down to 0, adding a pull-down resistor between RESET and GND removes stray leakage currents, holding RESET low (Figure 2a). The pull-down resistor value is not critical; 100k is large enough not to load RESET and small enough to pull it low. For the MAX6332, where RESET must be valid to VCC = 0, a 100k pull-up resistor between RESET and VCC will hold RESET high when VCC falls below 0.7V (Figure 2b). Since the MAX6334 has an open-drain, active-low output, it typically uses a pull-up resistor. With this device, RESET will most likely not maintain an active condition, but will drift to a non-active level due to the pull-up resistor and the reduced sinking capability of the opendrain device. Therefore, this device is not recommended for applications where the RESET pin is required to be valid down to VCC = 0.
Figure 1. Interfacing to Ps with Bidirectional Reset Pins
VCC
VCC
100k* MAX6333
RESET
MAX6332
RESET
GND
100k (b)
GND
(a)
*ASSUMES HIGH-Z RESET INPUT TO THE P
Figure 2. Ensuring Reset Valid Down to VCC = 0
Table 1. 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_ TA = +25C MIN TYP MAX 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 TA = -40C to +125C MIN 2.43 2.33 2.23 2.13 2.04 1.94 1.84 1.75 1.65 1.55 MAX 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 are available in approximately 100mV increments, with a 1.8% room-temperature variance.
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3-Pin, Ultra-Low-Voltage, Low-Power P Reset Circuits
Pin Configuration
TOP VIEW
GND 1 VCC VCC VCC
Typical Operating Circuit
MAX6332/MAX6333/MAX6334
MAX6332 MAX6333 MAX6334
MAX6332 MAX6333
3 VCC RESET (RESET) GND
P
RESET INPUT
GND
RESET (RESET) 2
SOT23-3
( ) ARE FOR MAX6332
( ) ARE FOR 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 VTH (V) 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) 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 SOT TOP MARK FZDM FZCN FZDL FZCM FZCL FZCS FZCR FZCQ FZCP FZCO FZDO FZCV FZDN FZCU FZCT
* Sample stock is generally held on all standard versions.
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3-Pin, Ultra-Low-Voltage, Low-Power P Reset Circuits MAX6332/MAX6333/MAX6334
Chip Information
TRANSISTOR COUNT: 505
Package Information
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information, go to www.maxim-ic.com/packages.)
SOTPO3L.EPS
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
6 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 (c) 2005 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products, Inc.

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