MAX6443-MAX6452 P Reset Circuits with Long Manual Reset Setup Period General Description The MAX6443-MAX6452 low-current microprocessor reset circuits feature single or dual manual reset inputs with an extended setup period. Because of the extended setup period, short switch closures (nuisance resets) are ignored. On all devices, the reset output asserts when any of the monitored supply voltages drops below its specified threshold. The reset output remains asserted for the reset timeout period (210ms typ) after all monitored supplies exceed their reset thresholds. The reset output is oneshot pulse asserted for the reset timeout period (140ms min) when selected manual reset input(s) are held low for an extended setup timeout period. These devices ignore manual reset transitions of less than the extended setup timeout period. The MAX6443-MAX6448 are single fixed-voltage P supervisors. The MAX6443/MAX6444 have a single extended manual reset input. The MAX6445/MAX6446 have two extended manual reset inputs. The MAX6447/ MAX6448 have one extended and one immediate manual reset input. The MAX6449-MAX6452 have one fixed-threshold P supervisor and one adjustable-threshold P supervisor. The MAX6449/MAX6450 have two delayed manual reset inputs. The MAX6451/MAX6452 have one delayed and one immediate manual reset input. The MAX6443-MAX6452 have an active-low RESET with push-pull or open-drain output logic options. These devices, offered in small SOT packages, are fully guaranteed over the extended temperature range (-40C to +85C). Applications Set-Top Boxes Consumer Electronics DVD Players Cable/DSL Modems MP3 Players Industrial Equipment Automotive Medical Devices Ordering Information continued at end of data sheet. Features Single or Dual-Supply Voltage Monitors Precision Factory-Set Reset Thresholds from 1.6V to 4.6V Adjustable Threshold to Monitor Voltages Down to 0.63V (MAX6449-MAX6452) Single or Dual Manual Reset Inputs with Extended Setup Period Optional Short Setup Time Manual Reset Input (MAX6447/MAX6448 and MAX6451/MAX6452) Immune to Short Voltage Transients Low 6A Supply Current Guaranteed Valid Reset Down to VCC = 1.0V Active-Low RESET (Push-Pull or Open-Drain) Outputs 140ms (min) Reset Timeout Period Small SOT143 and SOT23 Packages Ordering Information PART MAX6443US_ _ _+T MAX6444US_ _ _+T TEMP RANGE -40C to +85C -40C to +85C PIN-PACKAGE 4 SOT143 4 SOT143 MAX6444US_ _ _/V+T* -40C to +85C 4 SOT143 Note: The first "_ _" is a placeholder for the threshold voltage level of the devices. A desired threshold level is set by the two-number suffix found in Table 1. The third "_" is a placeholder for the manual reset setup period of the devices. A desired setup period is set by the letter suffix found in Table 2. All devices are available in tapeand-reel only. There is a 2500-piece minimum order increment for standard versions (Table 2). Sample stock is typically held on standard versions only. Nonstandard versions require a minimum order increment of 10,000 pieces. Contact factory for availability. Most devices are available in lead(Pb)-free packaging only. See Ordering Information for devices available in both leaded and lead(Pb)-free packaging. /V denotes an automotive qualified part. *Future product--contact factory for availability. +Denotes Lead(Pb)-free packages and - denotes leaded packages. For top mark information, please go to https://www.maximintegrated.com/en/design/packaging/topmark/. Pin Configurations TOP VIEW 4 VCC GND 1 MAX6443 MAX6444 3 MR1 RESET 2 SOT143 Pin Configurations continued at end of data sheet. 19-2656; Rev 5; 12/15 MAX6443-MAX6452 P Reset Circuits with Long Manual Reset Setup Period Absolute Maximum Ratings (All voltages referenced to GND.) VCC .........................................................................-0.3V to +6V Open-Drain RESET .................................................-0.3V to +6V Push-Pull RESET ..................................... -0.3V to (VCC + 0.3V) MR1, MR2, MR2, RSTIN .........................................-0.3V to +6V Input Current, All Pins.......................................................20mA Continuous Power Dissipation (TA = +70C) 4-Pin SOT143 (derate 4.0mW/C above +70C).........320mW 5-Pin SOT23 (derate 7.1mW/C above +70C)...........571mW 6-Pin SOT23 (derate 8.7mW/C above +70C)...........696mW Operating Temperature Range............................ -40C to +85C Junction Temperature.......................................................+150C Storage Temperature Range............................. -65C to +150C Lead Temperature (soldering, 10s).................................. +300C Soldering Temperature (reflow) Lead(Pb)-free...............................................................+260C Containing lead.............................................................+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 = 1.0V to 5.5V, TA = -40C to +85C, unless otherwise specified. Typical values are at TA = +25C.) (Note 1) PARAMETER Operating Voltage Range VCC Supply Current VCC Reset Threshold SYMBOL CONDITIONS VCC ICC VTH MIN 1.0 5.5 V 20 VCC = 3.6V, no load 6 16 46 4.50 4.63 4.75 44 4.25 4.38 4.50 31 3.00 3.08 3.15 29 2.85 2.93 3.00 26 2.55 2.63 2.70 23 2.25 2.32 2.38 22 2.12 2.19 2.25 17 1.62 1.67 1.71 16 1.52 1.58 1.62 60 VTH-RSTIN MAX6449-MAX6452 VHYST MAX6449-MAX6452 RSTIN Input Current IRSTIN MAX6449-MAX6452 TA = 0C to +85C 0.615 TA = -40C to +85C 0.610 Reset Timeout Period tRP VCC to RESET Output Delay tRD tMR 0.650 -25 V mV +25 15 nA s 140 210 K 6.72 10.08 13.44 L 4.48 6.72 8.96 S 2.24 3.36 4.48 T 1.12 1.68 2.24 VCC falling at 1mV/s V mV 0.645 2.5 MAX6449-MAX6452, VRSTIN falling at 1mV/s RSTIN to Reset Output Delay 0.630 A ppm/C 2 x VTH RSTIN Threshold Hysteresis www.maximintegrated.com UNITS 7 Reset Threshold Hysteresis Manual Reset Minimum Setup Period Pulse Width MAX VCC = 5.5V, no load Reset Threshold Tempco RSTIN Threshold TYP 280 20 ms s s Maxim Integrated 2 MAX6443-MAX6452 P Reset Circuits with Long Manual Reset Setup Period Electrical Characteristics (continued) (VCC = 1.0V to 5.5V, TA = -40C to +85C, unless otherwise specified. Typical values are at TA = +25C.) (Note 1) PARAMETER SYMBOL CONDITIONS MR2 Minimum Setup Period Pulse Width MAX6447/MAX6448/MAX6451/MAX6452 MR2 Glitch Rejection MAX6447/MAX6448/MAX6451/MAX6452 MR2 to RESET Delay Manual Reset Timeout Period MR2 to VCC Pullup Impedance RESET Output High (Push-Pull) RESET Open-Drain Leakage Current MAX6445/MAX6446/MAX6449/MAX6450 VOL VOH ILKG MR1, MR2, MR2 Input Low Voltage VIL MR1, MR2, MR2 Input High Voltage VIH TYP MAX 1 UNITS s 100 MAX6447/MAX6448/MAX6451/MAX6452 tMRP MR1 to VCC Pullup Impedance RESET Output Low (Open Drain or Push-Pull) MIN ns 200 ns 140 210 280 ms 25 50 75 kW 25 50 75 kW VCC 1.00V, ISINK = 50A, RESET asserted 0.3 VCC 1.20V, ISINK = 100A, RESET asserted 0.3 VCC 2.55V, ISINK = 1.2mA, RESET asserted 0.3 VCC 4.25V, ISINK = 3.2mA, RESET asserted 0.4 V VCC 1.80V, ISOURCE = 200A, RESET deasserted 0.8 x VCC VCC 3.15V, ISOURCE = 500A, RESET deasserted 0.8 x VCC VCC 4.75V, ISOURCE = 800A, RESET deasserted 0.8 x VCC RESET deasserted V 1 0.3 x VCC 0.7 x VCC A V V Note 1: Devices production tested at TA = +25C. Overtemperature limits are guaranteed by design. www.maximintegrated.com Maxim Integrated 3 MAX6443-MAX6452 P Reset Circuits with Long Manual Reset Setup Period Typical Operating Characteristics (VCC = 3.3V, TA = +25C, unless otherwise noted.) SUPPLY CURRENT vs. SUPPLY VOLTAGE 5 4 TA = -40C 3 2 1 1.00 0.99 0.98 0.97 MAX6443/52 toc03 MAX6443/52 toc02 1.01 200 150 RESET OCCURS ABOVE THE CURVE 100 50 VTH = 4.4V -40 -15 10 35 60 0 85 0 200 400 600 800 1000 RESET THRESHOLD OVERDRIVE (mV) NORMALIZED VCC RESET THRESHOLD vs. TEMPERATURE VCC TO RESET DELAY vs. TEMPERATURE RSTIN TO RESET DELAY vs. TEMPERATURE (RSTIN FALLING) 1.01 1.00 0.99 0.98 VCC = FALLING AT 1mV/s 23.6 23.2 22.8 22.4 22.0 21.6 21.2 20.8 -40 -15 10 35 60 85 RSTIN FALLING AT 1mV/s 23.6 23.2 22.8 22.4 22.0 21.6 21.2 20.8 20.4 20.4 20.0 24.0 RSTIN TO RESET DELAY (s) 1.02 24.0 -40 -15 TEMPERATURE (C) 10 35 60 85 20.0 -40 -15 MANUAL RESET TO RESET DELAY (MAX6445L/MAX6446L/MAX6449L/MAX6450L) MAX6443/52 toc07 MR1 (5V/div) 10 35 60 85 TEMPERATURE (C) TEMPERATURE (C) VCC = 5V MAX6443/52 toc06 TEMPERATURE (C) MAX6443/52 toc05 SUPPLY VOLTAGE (V) MAX6443/52 toc04 NORMALIZED VCC RESET THRESHOLD 1.02 0.95 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 1.03 0.97 1.03 250 0.96 VCC TO RESET DELAY (s) 0 1.04 TRANSIENT DURATION (s) 6 1.05 NORMALIZED TIMEOUT PERIOD SUPPLY CURRENT (A) TA = +85C TA = +25C 7 MAX6443/52 toc01 9 8 MAXIMUM TRANSIENT DURATION vs. RESET THRESHOLD OVERDRIVE NORMALIZED RESET TIMEOUT PERIOD vs. TEMPERATURE VCC TO RESET DELAY MAX6443/52 toc08 VCC = 4.5V VTH = 4.392V VCC (100mV/div) VCC = 4.3V MR2 (5V/div) RESET (5V/div) TIME (1s/div) www.maximintegrated.com RESET (2V/div) TIME (100s/div) Maxim Integrated 4 MAX6443-MAX6452 P Reset Circuits with Long Manual Reset Setup Period Pin Description PIN MAX6443 MAX6444 MAX6445 MAX6446 MAX6447 MAX6448 MAX6449 MAX6450 MAX6451 MAX6452 NAME 1 2 2 2 2 GND 2 1 1 1 1 3 -- 3 -- 3 RESET MR1 -- 3 -- 3 -- 4 4 4 4 4 FUNCTION Ground Active-Low Push-Pull or Open-Drain Output. RESET changes from high to low when VCC or RSTIN drops below its selected reset threshold and remains low for the 210ms reset timeout period after all monitored power-supply inputs exceed their selected reset thresholds. RESET is one-shot pulsed low for the reset timeout period (140ms min) after selected manual reset inputs are asserted longer than the specified setup period. For the open-drain output, use a minimum 20kW pullup resistor to VCC. Manual Reset Input, Active Low. Internal 50kW pullup to VCC. Pull MR1 low for the typical input pulse width (tMR) to one-shot pulse RESET for the reset timeout period. Manual Reset Input, Active Low. Pull both MR1 and MR2 low for the typical input pulse width (tMR) to oneshot pulse RESET for the reset timeout period. VCC V CC Voltage Input. Power supply and input for the primary microprocessor voltage reset monitor. -- 5 -- 6 -- MR2 Manual Reset Input, Active Low. Internal 50kW pullup to VCC. Pull both MR1 and MR2 low for the typical input pulse width (tMR) to one-shot pulse RESET for the reset timeout period. -- -- 5 -- 6 MR2 Manual Reset Input. Pull the MR2 high to immediately one-shot pulse RESET for the reset timeout period. -- -- -- 5 5 RSTIN Reset Input. High-impedance input to the adjustable reset comparator. Connect RSTIN to the center point of an external resistor-divider to set the threshold of the externally monitored voltage. Detailed Description Reset Output The reset output is typically connected to the reset input of a microprocessor (P). A P's reset input starts or restarts the P in a known state. The MAX6443- MAX6452 P supervisory circuits provide the reset logic to prevent code-execution errors during powerup, power-down and brownout conditions (see the Typical Operating Circuit). RESET changes from high to low whenever the monitored voltages (RSTIN or VCC) drop below the reset www.maximintegrated.com threshold voltages. Once VRSTIN and VCC exceed their respective reset threshold voltages, RESET remains low for the reset timeout period and then goes high. RESET is one-shot pulsed whenever selected manual reset inputs are asserted. RESET stays asserted for the normal reset timeout period (140ms min). RESET is guaranteed to be in the proper output logic state for VCC inputs 1V. For applications requiring valid reset logic when VCC is less than 1V, see the Ensuring a Valid RESET Output Down to VCC = 0V section. Maxim Integrated 5 MAX6443-MAX6452 P Reset Circuits with Long Manual Reset Setup Period Manual Reset Input Options Unlike typical manual reset functions associated with supervisors, each device in the MAX6443-MAX6452 family includes at least one manual reset input, which must be held logic-low for an extended setup period (tMR) before the RESET output asserts. When valid manual reset input conditions/setup periods are met, the RESET output is one-shot pulse asserted low for a fixed reset timeout period (140ms min). Existing front-panel pushbutton switches (i.e., power on/off, channel up/down, or mode select) can be used to drive the manual reset inputs. The extended manual reset setup period prevents nuisance system resets during normal front-panel usage or resulting from inadvertent short-term pushbutton closure. The MAX6443/MAX6444, MAX6447/MAX6448, and MAX6451/MAX6452 include a single manual reset input with extended setup period (MR1). The MAX6445/ MAX6446 and MAX6449/MAX6450 include two manual reset inputs (MR1 and MR2) with extended setup periods. For dual MR1, MR2 devices, both inputs must be held low simultaneously for the extended setup period (tMR) before the reset output is pulse asserted. The dual extended setup provides greater protection from nuisance resets. (For example, the user or service technician is informed to simultaneously push both the on/off button and the channel-select button for 6.72s (L suffix) to reset the system.) The MAX6443/MAX6452 RESET output is pulse asserted once for the reset timeout period after each valid manual reset input condition. At least one manual reset input must be released (go high) and then be driven low for the extended setup period before RESET asserts again. Internal timing circuitry debounces low-to-high manual reset logic transitions, so no external circuitry is required. Figure 1 illustrates the single manual reset function of the MAX6443/MAX6444 single-voltage monitors, and Figure 2 represents the dual manual reset function of the MAX6445/MAX6446 and MAX6449/MAX6450. The MAX6447/MAX6448 and MAX6451/MAX6452 include both an extended setup period and immediate setup period manual reset inputs. A low-to-high MR2 rising edge transition immediately pulse asserts the RESET output for the reset timeout period (140ms min). If the MAX6447/MAX6448 and MAX6451/MAX6452 MR2 input senses another rising edge before the end of the 140ms timeout period (Figure 3), the internal timer clears and begins counting again. If no rising edges are detected within the 210ms timeout period, RESET deasserts. The high-to-low transition on MR2 input is internally debounced for 210ms to ensure that www.maximintegrated.com RESET TIMEOUT PERIOD 210ms MR1 SETUP PERIOD tMR MR1 RESET Figure 1. MAX6443/MAX6444 Manual Reset Timing Diagram 210ms MR1 tMR MR2 RESET Figure 2. MAX6445/MAX6446/MAX6449/MAX6450 Manual Reset Timing Diagram there are no false RESET assertions when MR2 is driven from high to low (Figure 4). The MR2 input can be used for system test purposes or smart-card-detect applications (see the Applications Information section). Adjustable Input Voltage (RSTIN) The MAX6449-MAX6452 monitor the voltage on RSTIN using an adjustable reset threshold set with an external resistor voltage-divider (Figure 5). Use the following formula to calculate the externally monitored voltage (VMON-TH): VMON-TH = VTH-RSTIN x (R1 + R2)/R2 where VMON-TH is the desired reset threshold voltage and VTH-RSTIN is the reset input threshold (0.63V). Resistors R1 and R2 can have very high values to minimize current consumption because of low leakage currents. Set R2 to some conveniently high value (250k, for example), and calculate R1 based on the desired reset threshold voltage, using the following formula: R1 = R2 x (VMON-TH/VTH-RSTIN - 1) Maxim Integrated 6 MAX6443-MAX6452 P Reset Circuits with Long Manual Reset Setup Period t < 210ms COUNTER RESET 210ms DEBOUNCING PERIOD POSITIVE EDGE t = 210ms MR2 210ms TIMEOUT PERIOD MR2 NO RESET OUTPUT ASSERTED RESET RESET Figure 3. MAX6447/MAX6448/MAX6451/MAX6452 MR2 Assertion DebouncingTiming Diagram VCC VMON_TH Figure 4. MAX6447/MAX6448/MAX6451/MAX6452 MR2 Deassertion Debouncing Timing Diagram +3.3V MAX6449 MAX6451 R1 RSTIN VCC VCC RESET RESET MAX6443L R2 VCC P LED GND RESET GND MR1 NMI VMON_TH = 0.63 x (R1 + R2) / R2 Figure 5. Calculating the Monitored Threshold Voltages Applications Information Interrupt Before Reset To minimize data loss and speed system recovery, many applications interrupt the processor or reset only portions of the system before a processor hard reset is asserted. The extended setup time of the MAX6443- MAX6452 manual reset inputs allows the same pushbutton (connected to both the processor interrupt and the extended MR1 input, as shown in Figure 6) to control both the interrupt and hard reset functions. If the pushbutton is closed for less than tMR, the processor is only interrupted. If the system still does not respond properly, the pushbutton (or two buttons for the dual manual reset) can be closed for the full extended setup period to hard reset the processor. If desired, connect an LED to the RESET output to blink off (or on) for the reset timeout period to signify when the pushbutton is www.maximintegrated.com PUSHBUTTON SWITCH: CLOSE FOR < 4.48s FOR SYSTEM INTERRUPT; CLOSE FOR > 6.72s FOR SYSTEM RESET Figure 6. Interrupt Before Reset Application Circuit closed long enough for a hard reset (the same LED might be used as the front-panel power-on display). Smart Card Insertion/Removal The MAX6447/MAX6448/MAX6451/MAX6452 dual manual resets are useful in applications in which both an extended and immediate setup periods are needed. Figure 7 illustrates the insertion and removal of a smart card. MR1 monitors a front-panel pushbutton. When closed for tMR, RESET one-shot pulses low for 140ms min. Because MR1 is internally pulled to VCC through a 50k resistor, the front-panel switch can be connected to a microprocessor for general-purpose I/O control. MR2 monitors a switch to detect when a smart card is inserted. When the switch is closed high (card inserted), Maxim Integrated 7 MAX6443-MAX6452 P Reset Circuits with Long Manual Reset Setup Period +3.3V +1.5V 3.3V 5V CORE SUPPLY I/O SUPPLY VCC RESET MAX6451 RSTIN VCC P MR1 GND RESET DIGITAL INPUT MAX6444 MAX6446 MAX6448 MAX6450 MAX6452 MR2 SMART CARD DETECT: IMMEDIATE ONE-SHOT WHEN MANUAL RESET CLOSES 100k RESET P RESET N GND FRONT-PANEL SWITCH STANDARD P INPUT AND tMR MANUAL RESET DELAY Figure 7. MAX6451/MAX6452 Application Circuit Figure 8. Interfacing to Other Voltage Levels RESET one-shot pulses low for 140ms. MR2 is internally debounced for 210ms to prevent false resets when the smart card is removed. Ensuring a Valid RESET Down to VCC = 0V (Push-Pull RESET) Interfacing to Other Voltages for Logic Compatibility The open-drain RESET output can be used to interface to a P with other logic levels. As shown in Figure 8, the open-drain output can be connected to voltages from 0 to 6V. Generally, the pullup resistor connected to the RESET connects to the supply voltage that is being monitored at the IC's VCC pin. However, some systems may use the open-drain output to level-shift from the monitored supply to reset circuitry powered by some other supply (Figure 8). Keep in mind that as the supervisor's VCC decreases toward 1V, so does the IC's ability to sink current at RESET. RESET is pulled high as VCC decays toward 0. The voltage where this occurs depends on the pullup resistor value and the voltage to which it is connected. www.maximintegrated.com When VCC falls below 1V, RESET current-sinking capabilities decline drastically. The high-impedance CMOS-logic inputs connected to RESET can drift to undetermined voltages. This presents no problems in most applications, because most Ps and other circuitry do not operate with VCC below 1V. In applications in which RESET must be valid down to 0V, add a pulldown resistor between RESET and GND for the push-pull outputs. The resistor sinks any stray leakage currents, holding RESET low (Figure 9). The value of the pulldown resistor is not critical; 100k is large enough not to load RESET and small enough to pull RESET to ground. The external pulldown cannot be used with the open-drain reset outputs. Transient Immunity In addition to issuing a reset to the P during power-up, power-down, and brownout conditions, these supervisors are relatively immune to short-duration falling transients (glitches). The graph Maximum Transient Duration vs. Reset Threshold Overdrive in the Typical Operating Characteristics section shows this relationship. Maxim Integrated 8 MAX6443-MAX6452 P Reset Circuits with Long Manual Reset Setup Period VCC MAX6443 MAX6445 MAX6447 MAX6449 MAX6451 VCC RESET 100k GND The area below the curves of the graph is the region in which these devices typically do not generate a reset pulse. This graph was generated using a falling pulse applied to VCC, starting above the actual reset threshold (VTH) and ending below it by the magnitude indicated (reset threshold overdrive). As the magnitude of the transient increases (VCC goes further below the reset threshold), the maximum allowable pulse width decreases. Typically, a VCC transient that goes 100mV below the reset threshold and lasts 20s or less does not cause a reset pulse to be asserted. Figure 9. Ensuring RESET Valid to VCC = 0V Table 1. Reset Voltage Threshold PART NO. SUFFIX (__) VCC NOMINAL VOLTAGE THRESHOLD (V) 46 4.625 44 4.375 31 3.075 29 2.925 26 2.625 23 2.313 22 2.188 17 1.665 16 1.575 Table 2. Manual Reset Setup Period (tMR) PART NO. SUFFIX (_) MANUAL RESET SETUP PERIOD (s) K 10.08 L 6.72 S 3.36 T 1.68 www.maximintegrated.com Maxim Integrated 9 MAX6443-MAX6452 P Reset Circuits with Long Manual Reset Setup Period Pin Configurations (continued) TOP VIEW RESET 1 GND 2 5 MR2 MAX6445 MAX6446 MR1 3 RESET 1 GND 2 4 VCC RESET 1 GND 2 MAX6449 MAX6450 MR1 3 RESET 1 6 MR2 5 RSTIN GND 2 4 VCC MR1 3 Ordering Information (continued) TEMP RANGE PIN-PACKAGE MAX6445UK_ _ _+T -40C to +85C 5 SOT23 MAX6446UK_ _ _+T -40C to +85C 5 SOT23 MAX6447UK_ _ _+T -40C to +85C 5 SOT23 MAX6448UK_ _ _+T -40C to +85C 5 SOT23 MAX6449UT_ _ _+T -40C to +85C 6 SOT23 MAX6450UT_ _ _+T -40C to +85C 6 SOT23 MAX6451UT_ _ _+T -40C to +85C 6 SOT23 MAX6452UT_ _ _+T -40C to +85C 6 SOT23 Note: The first "_ _" is a placeholder for the threshold voltage level of the devices. A desired threshold level is set by the two-number suffix found in Table 1. The third "_" is a placeholder for the manual reset setup period of the devices. A desired setup period is set by the letter suffix found in Table 2. All devices are available in tapeand-reel only. There is a 2500-piece minimum order increment for standard versions (Table 2). Sample stock is typically held on standard versions only. Nonstandard versions require a minimum order increment of 10,000 pieces. Contact factory for availability. Most devices are available in lead(Pb)-free packaging only. See Ordering Information for devices available in both leaded and lead(Pb)-free packaging. /V denotes an automotive qualified part. *Future product--contact factory for availability. +Denotes Lead(Pb)-free packages and - denotes leaded packages. For top mark information, please go to https://www.maximintegrated.com/en/design/packaging/topmark/. www.maximintegrated.com 4 VCC 6 MR2 5 RSTIN 4 VCC SOT23-5 SOT23-6 PART MR2 MAX6447 MAX6448 MR1 3 SOT23-5 5 MAX6451 MAX6452 SOT23-6 Typical Operating Circuit +3.3V VCC VCC MAX6444 MR1 RESET GND P RESET GND RESET TIMEOUT PERIOD 210ms MR1 SETUP PERIOD tMR MR1 RESET Maxim Integrated 10 MAX6443-MAX6452 P Reset Circuits with Long Manual Reset Setup Period Selector Guide PART MR1 EXT. SETUP MR2 (NO SETUP) MR2 EXT. SETUP RSTIN PUSH-PULL RESET OPEN-DRAIN RESET MAX6443 -- -- -- -- MAX6444 -- -- -- -- MAX6445 -- -- -- MAX6446 -- -- -- -- -- MAX6447 -- MAX6448 -- -- -- MAX6449 -- -- MAX6450 -- -- MAX6451 -- -- -- -- MAX6452 Functional Diagram VCC MAX6443- MAX6452 RESET TIMEOUT PERIOD (210ms typ) MAX6449- RSTIN MAX6452 VCC MANUAL RESET SETUP PERIOD tMR 0.63V 1.23V VCC GND MR2 ONE-SHOT DEBOUNCE CIRCUIT RESET MR2 MAX6447 MAX6448 MAX6451 MAX6452 VCC MR1 MR2 MAX6445 MAX6446 MAX6449 MAX6450 www.maximintegrated.com Maxim Integrated 11 MAX6443-MAX6452 Chip Information PROCESS: BiCMOS www.maximintegrated.com P Reset Circuits with Long Manual Reset Setup Period Package Information 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. 4 SOT143 U4+1 21-0052 90-0183 5 SOT23 U5+1, U5-1 21-0057 90-0174 6 SOT23 U6+1 21-0058 90-0175 Maxim Integrated 12 MAX6443-MAX6452 P Reset Circuits with Long Manual Reset Setup Period Revision History REVISION NUMBER REVISION DATE PAGES CHANGED 0 10/02 Initial release 3 6/10 Revised the General Description, Features, Applications, Ordering Information, Absolute Maximum Ratings, Electrical Characteristics, Typical Operating Characteristics, Pin Description, the Manual Reset Input Options, Interrupt Before Reset, and Smart Card Insertion/Removal sections, Functional Diagram, Typical Operating Circuit, Selector Guide, Figures 1, 6, and 7, as well as Tables 2 and 3 to add extended setup timeout specifications 4 3/14 Added the automotive MAX6444US_ _ _/V+T to the Ordering Information table 5 12/15 Added lead-free package part numbers, removed top mark table and added reference to top mark information on website DESCRIPTION -- 1, 2, 4, 5-12 1 1, 10, 12 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) 2015 Maxim Integrated Products, Inc. 13 Mouser Electronics Authorized Distributor Click to View Pricing, Inventory, Delivery & Lifecycle Information: Maxim Integrated: MAX6448UK44L+T MAX6443US22L+T MAX6443US16L+T MAX6443US17L+T MAX6443US23L+T MAX6443US26L+T MAX6443US29L+T MAX6443US31L+T MAX6443US44L+T MAX6443US46L+T MAX6444US16L+T MAX6444US17L+T MAX6444US22L+T MAX6444US23L+T MAX6444US26L+T MAX6444US29L+T MAX6444US31L+T MAX6444US44L+T MAX6444US46L+T MAX6445UK16L+T MAX6445UK17L+T MAX6445UK22L+T MAX6445UK23L+T MAX6445UK26L+T MAX6445UK29L+T MAX6445UK31L+T MAX6445UK44L+T MAX6445UK46L+T MAX6446UK16L+T MAX6446UK17L+T MAX6446UK22L+T MAX6446UK23L+T MAX6446UK26L+T MAX6446UK29L+T MAX6446UK31L+T MAX6446UK44L+T MAX6446UK46L+T MAX6447UK16L+T MAX6447UK17L+T MAX6447UK22L+T MAX6447UK23L+T MAX6447UK26L+T MAX6447UK29L+T MAX6447UK31L+T MAX6447UK44L+T MAX6447UK46L+T MAX6448UK16L+T MAX6448UK17L+T MAX6448UK22L+T MAX6448UK23L+T MAX6448UK26L+T MAX6448UK29L+T MAX6448UK31L+T MAX6448UK46L+T MAX6449UT16L+T MAX6449UT17L+T MAX6449UT22L+T MAX6449UT23L+T MAX6449UT26L+T MAX6449UT29L+T MAX6449UT31L+T MAX6449UT44L+T MAX6449UT46L+T MAX6450UT16L+T MAX6450UT17L+T MAX6450UT22L+T MAX6450UT23L+T MAX6450UT26L+T MAX6450UT29L+T MAX6450UT31L+T MAX6450UT44L+T MAX6450UT46L+T MAX6451UT16L+T MAX6451UT17L+T MAX6451UT22L+T MAX6451UT23L+T MAX6451UT26L+T MAX6451UT29L+T MAX6451UT31L+T MAX6451UT44L+T MAX6451UT46L+T MAX6452UT16L+T MAX6452UT17L+T MAX6452UT22L+T MAX6452UT23L+T MAX6452UT26L+T MAX6452UT29L+T MAX6452UT31L+T MAX6452UT44L+T MAX6452UT46L+T