MAX6332/MAX6333/ MAX6334 3-Pin, Ultra-Low-Voltage, Low-Power P Reset Circuits General Description Benefits and Features 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. Ultra-Low 0.7V Operating Supply Voltage Low 3.3A Supply Current Precision Monitoring of 1.8V and 2.5V Power- Supply Voltages 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. Reset Thresholds Available from 1.6V to 2.5V, in Approximately 100mV Increments The reset comparator in these ICs is designed to ignore fast transients on VCC. Reset thresholds are factory-trimmable 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. Power-Supply Transient Immunity 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) No External Components 3-Pin SOT23 Package Pin-Compatible with MAX809/MAX810 and MAX6326/MAX6327/MAX6328 Selector Guide (Standard Versions*) appears at end of data sheet. Applications Pentium(R) II Computers Computers Controllers Intelligent Instruments Critical P/C Power Monitoring Portable/Battery-Powered Equipment Typical Operating Circuit VCC VCC VCC MAX6332 MAX6333 RESET (RESET) GND ( ) ARE FOR MAX6332 Pentium is a registered trademark of Intel Corp. 19-1411; Rev 4; 2/16 P RESET INPUT GND MAX6332/MAX6333/ MAX6334 3-Pin, Ultra-Low-Voltage, Low-Power P Reset Circuits 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 Soldering Temperature (reflow) Lead(Pb)-free packages...............................................+260C Packages containing lead (Pb).....................................+240C 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 asserted.) PARAMETER SYMBOL CONDITIONS TA = 0C to +85C Supply Voltage Range VCC TA = -40C to +85C TA = 0C to +125C Supply Current Reset Threshold ICC No load VTH MAX633_UR__D_-T, Table 1 VCC Falling Reset Delay Reset Active Timeout Period MIN MAX MAX6332/MAX6333 0.7 5.5 MAX6334 1.0 5.5 MAX6332/MAX6333 0.78 5.5 MAX6334 1.2 5.5 MAX6332/MAX6333 MAX6334 1.2 5.5 VCC = 1.8V 3.0 6.0 VCC = 2.5V 3.3 7.0 VTH - 1.8% VTH VTH + 1.8% VTH - 3% VTH VTH + 3% TA = +25C TA = -40C to +125C VCC falling at 10V/ms tRP TYP 24 MAX633_UR__D1-T 1 1.5 2 MAX633_UR__D2-T 20 30 40 MAX633_UR__D3-T 100 150 200 VOL Reset asserted ISINK = 50A, VCC 1.0V 0.4 ISINK = 500A, VCC 1.8V 0.3 RESET Output High Voltage (MAX6333) VOH Reset not asserted ISOURCE = 200A, VCC 1.8V 0.8 x VCC ISOURCE = 500A, VCC 2.7V 0.8 x VCC VOH Reset asserted ISOURCE = 1A, VCC 1.0V 0.8 x VCC ISOURCE = 200A, VCC 1.8V 0.8 x VCC VOL Reset not asserted ISINK = 500A, VCC 1.8V 0.3 ISINK = 1.2mA, VCC 2.7V 0.3 RESET Output Leakage Current (MAX6334) www.maximintegrated.com VCC > VTH, RESET not asserted V A V s RESET Output Low Voltage (MAX6333/MAX6334) RESET Output Voltage (MAX6332) UNITS ms V V 0.5 V A Maxim Integrated 2 MAX6332/MAX6333/ MAX6334 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 3.2 VCC = 2.5V 3.0 VCC = 1.8V 2.8 2.6 2.4 2.2 -40 -20 0 20 40 60 80 1.010 1.000 0.990 0.980 0.970 70 60 VCC FALLING AT 1V/ms 50 40 30 VCC FALLING AT 10V/ms 20 0.960 0.950 100 MAX6332/33/34 toc03 1.020 80 -60 -40 -20 0 20 40 60 80 10 100 -60 -40 -20 0 20 40 60 TEMPERATURE (C) TEMPERATURE (C) TEMPERATURE (C) MAXIMUM TRANSIENT DURATION vs. RESET COMPARATOR OVERDRIVE OUTPUT VOLTAGE HIGH vs. SUPPLY VOLTAGE OUTPUT VOLTAGE LOW vs. SUPPLY VOLTAGE 400 RESET OCCURS 300 200 RESET DOES NOT OCCUR 100 0.1 1 10 100 1000 RESET COMPARATOR OVERDRIVE (mV) www.maximintegrated.com 160 VTH = 2.2V ISOURCE = 100A RESET ASSERTED 140 120 100 80 60 TA = +25C 40 20 0 TA = -40C 80 OUTPUT VOLTAGE LOW (mV) 500 0 1.030 MAX6332/33/34 toc05 MAXIMUM TRANSIENT DURATION (s) 600 -60 MAX6332/33/34 toc04 2.0 RESET NOT ASSERTED OUTPUT VOLTAGE HIGH (VCC - VOH) (mV) ICC (A) 3.4 VTH = 2.2V 1.040 0.5 0.75 1.0 1.25 1.5 1.75 2.0 2.25 2.5 VCC (V) 100 VTH = 2.5V ISINK = 500A RESET ASSERTED 70 60 50 40 TA = +25C 30 20 0 TA = +85C TA = -40C 10 TA = +85C 80 MAX6332/33/34 toc06 3.6 1.050 MAX6332/33/34 toc02 3.8 NORMALIZED RESET TIMEOUT PERIOD MAX6332/33/34 toc01 4.0 VCC FALLING PROPAGATION DELAY vs. TEMPERATURE PROPAGATION DELAY (s) SUPPLY CURRENT vs. TEMPERATURE 0.5 1.00 1.50 2.00 2.50 3.00 VCC (V) Maxim Integrated 3 MAX6332/MAX6333/ MAX6334 3-Pin, Ultra-Low-Voltage, Low-Power P Reset Circuits Pin Configuration TOP VIEW GND 1 MAX6332 MAX6333 MAX6334 3 VCC RESET (RESET) 2 ( ) ARE FOR MAX6332 SOT23-3 Pin Description PIN MAX6332 MAX6333 MAX6334 NAME 1 1 GND -- 2 RESET 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. 2 -- RESET 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. 3 3 VCC www.maximintegrated.com FUNCTION Ground Supply Voltage (0.7V to 5.5V) Maxim Integrated 4 MAX6332/MAX6333/ MAX6334 3-Pin, Ultra-Low-Voltage, Low-Power P Reset Circuits Applications Information VCC Interfacing to Ps with Bidirectional Reset Pins VCC Since the RESET output on the MAX6334 is opendrain, 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 pullup resistor allows either device to assert reset (Figure 1). Negative-Going VCC Transients In addition to issuing a reset to the P during powerup, power-down, and brownout conditions, these devices are relatively immune to short-duration, negativegoing 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 open-drain device. Therefore, this device is not recommended for applications where the RESET pin is required to be valid down to VCC = 0. VCC P MOTOROLA 68HCXX RESET INPUT MAX6334 RESET GND GND Figure 1. Interfacing to Ps with Bidirectional Reset Pins VCC VCC MAX6333 MAX6332 RESET RESET 100k GND 100k* (a) GND (b) *ASSUMES HIGH-Z RESET INPUT TO THE P Figure 2. Ensuring Reset Valid Down to VCC = 0 Table 1. Factory-Trimmed Reset Thresholds* TA = -40C to +125C BIT 4 RESETTHRESHOLD SUFFIX MIN TYP MAX MIN MAX MAX633_UR25D_ 2.46 2.50 2.55 2.43 2.58 MAX633_UR24D_ 2.36 2.40 2.44 2.33 2.47 MAX633_UR23D_ 2.26 2.30 2.34 2.23 2.37 MAX633_UR22D_ 2.16 2.20 2.24 2.13 2.27 MAX633_UR21D_ 2.06 2.10 2.14 2.04 2.16 MAX633_UR20D_ 1.96 2.00 2.04 1.94 2.06 MAX633_UR19D_ 1.87 1.90 1.93 1.84 1.96 MAX633_UR18D_ 1.77 1.80 1.83 1.75 1.85 MAX633_UR17D_ 1.67 1.70 1.73 1.65 1.75 MAX633_UR16D_ 1.57 1.60 1.63 1.55 1.65 TA = +25C *Factory-trimmed reset thresholds are available in approximately 100mV increments, with a 1.8% room-temperature variance. www.maximintegrated.com Maxim Integrated 5 MAX6332/MAX6333/ MAX6334 3-Pin, Ultra-Low-Voltage, Low-Power P Reset Circuits Selector Guide (Standard Versions*) PART OUTPUT STAGE NOMINAL VTH (V) MINIMUM RESET TIMEOUT (ms) SOT TOP MARK MAX6332UR23D3-T Push/Pull RESET 2.30 100 FZDM MAX6332UR22D3-T Push/Pull RESET 2.20 100 FZCN MAX6332UR20D3-T Push/Pull RESET 2.00 100 FZDL MAX6332UR18D3-T Push/Pull RESET 1.80 100 FZCM MAX6332UR16D3-T Push/Pull RESET 1.60 100 FZCL MAX6333UR23D3-T Push/Pull RESET 2.30 100 FZCS MAX6333UR22D3-T Push/Pull RESET 2.20 100 FZCR MAX6333UR20D3-T Push/Pull RESET 2.00 100 FZCQ MAX6333UR18D3-T Push/Pull RESET 1.80 100 FZCP MAX6333UR16D3-T Push/Pull RESET 1.60 100 FZCO MAX6334UR23D3-T Open-Drain RESET 2.30 100 FZDO MAX6334UR22D3-T Open-Drain RESET 2.20 100 FZCV MAX6334UR20D3-T Open-Drain RESET 2.00 100 FZDN MAX6334UR18D3-T Open-Drain RESET 1.80 100 FZCU Open-Drain RESET 1.60 100 FZCT MAX6334UR16D3-T *Sample stock is generally held on all standard versions. Package Information Ordering Information PART TEMP RANGE PIN-PACKAGE MAX6332UR__D_-T -40C to +125C 3 SOT23 MAX6333UR__D_-T -40C to +125C 3 SOT23 MAX6334UR__D_-T -40C to +125C 3 SOT23 *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. For the latest package outline information and land patterns (footprints), go to www.maximintegrated.com/packages. Note that a "+", "#", or "-" in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the package regardless of RoHS status. PACKAGE TYPE PACKAGE CODE OUTLINE NO. LAND PATTERN NO. 3 SOT23 U3+1 21-0051 90-0179 Devices are available in both leaded and lead-free packaging. Specify lead-free by replacing "-T" with "+T" when ordering. www.maximintegrated.com Maxim Integrated 6 MAX6332/MAX6333/ MAX6334 3-Pin, Ultra-Low-Voltage, Low-Power P Reset Circuits Revision History REVISION NUMBER REVISION DATE PAGES CHANGED 0 12/98 Initial release 1 6/00 Revised Ordering Information, Absolute Maximum Ratings, Electrical Characteristics, and Table 1. 2 12/05 Revised Ordering Information to add lead-free information. 1 3 6/12 Update Ordering Information with automotive part. 1 4 2/16 Updated Ordering Information table and Applications section 1 DESCRIPTION -- 1, 2, 4 For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim Integrated's website at www.maximintegrated.com. Maxim Integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim Integrated product. No circuit patent licenses are implied. Maxim Integrated reserves the right to change the circuitry and specifications without notice at any time. The parametric values (min and max limits) shown in the Electrical Characteristics table are guaranteed. Other parametric values quoted in this data sheet are provided for guidance. Maxim Integrated and the Maxim Integrated logo are trademarks of Maxim Integrated Products, Inc. (c) 2016 Maxim Integrated Products, Inc. 7 Mouser Electronics Authorized Distributor Click to View Pricing, Inventory, Delivery & Lifecycle Information: Maxim Integrated: MAX6333UR21D1+T MAX6332UR16D1+T MAX6332UR16D2+T MAX6332UR16D3+T MAX6332UR17D1+T MAX6332UR17D2+T MAX6332UR17D3+T MAX6332UR18D1+T MAX6332UR18D2+T MAX6332UR18D3+T MAX6332UR19D1+T MAX6332UR19D2+T MAX6332UR20D1+T MAX6332UR20D2+T MAX6332UR20D3+T MAX6332UR21D1+T MAX6332UR21D2+T MAX6332UR21D3+T MAX6332UR22D1+T MAX6332UR22D2+T MAX6332UR22D3+T MAX6332UR23D1+T MAX6332UR23D2+T MAX6332UR23D3+T MAX6332UR24D1+T MAX6332UR24D2+T MAX6332UR24D3+T MAX6332UR25D1+T MAX6332UR25D2+T MAX6332UR25D3+T MAX6333UR16D1+T MAX6333UR16D2+T MAX6333UR16D3+T MAX6333UR17D1+T MAX6333UR17D2+T MAX6333UR17D3+T MAX6333UR18D1+T MAX6333UR18D2+T MAX6333UR18D3+T MAX6333UR19D1+T MAX6333UR19D2+T MAX6333UR19D3+T MAX6333UR20D1+T MAX6333UR20D2+T MAX6333UR20D3+T MAX6333UR21D2+T MAX6333UR21D3+T MAX6333UR22D1+T MAX6333UR22D2+T MAX6333UR22D3+T MAX6333UR23D1+T MAX6333UR23D2+T MAX6333UR23D3+T MAX6333UR24D1+T MAX6333UR24D2+T MAX6333UR24D3+T MAX6333UR25D1+T MAX6333UR25D2+T MAX6333UR25D3+T MAX6334UR16D1+T MAX6334UR16D2+T MAX6334UR16D3+T MAX6334UR17D1+T MAX6334UR17D2+T MAX6334UR17D3+T MAX6334UR18D1+T MAX6334UR18D2+T MAX6334UR18D3+T MAX6334UR19D1+T MAX6334UR19D2+T MAX6334UR19D3+T MAX6334UR20D1+T MAX6334UR20D2+T MAX6334UR20D3+T MAX6334UR21D1+T MAX6334UR21D2+T MAX6334UR21D3+T MAX6334UR22D1+T MAX6334UR22D2+T MAX6334UR22D3+T MAX6334UR23D1+T MAX6334UR23D2+T MAX6334UR23D3+T MAX6334UR24D1+T MAX6334UR24D2+T MAX6334UR24D3+T MAX6334UR25D1+T MAX6334UR25D2+T MAX6334UR25D3+T