MAXIM MAX6361/MAX6363/MAX6364 handbook
Contents
1. AX6361 E vr A 19 1615 Rev 0 1 00 SOT23 Low Power Supervisory Circuits General Description The MAX6361 MAX6363 MAX6364 supervisory circuits reduce the complexity and number of components required for power supply monitoring and battery control functions in microprocessor uP systems The circuits sig nificantly improve system reliability and accuracy com pared to that obtainable with separate ICs or discrete components Their functions include uP reset backup battery switchover and power failure warning The MAX6361 MAX6363 MAX6364 operate from supply voltages as low as 1 2V The factory preset reset threshold voltage ranges from 2 32V to 4 63V see Ordering Information These devices provide a manual reset input MAX6361 battery on output MAX6363 and an auxiliary adjustable reset input MAX6364 In addition each part type is offered in three reset output versions an active low push pull reset an active low open drain reset and an active high push pull reset see Selector Guide at end of data sheet Applications Computers Fax Machines Controllers Industrial Control Intelligent Instruments Critical uP uC Power Monitoring POS Equipment Portable Battery Powered Equipment Pin Configurations TOP VIEW MAXIM MAX6361 SOT23 6 Pin Configurations continued at end of data sheet Selector Guide appears at end of data sheet Typical Operating Circuit appears at end of2. 6364 Applications Information Operation Without a Backup Power Source The MAX6361 MAX6363 MAX6364 were designed for battery backed applications If a backup battery is not used connect Vcc to OUT and connect BATT to GND Replacing the Backup Battery If BATT is decoupled with a 0 1uF capacitor to ground the backup power source can be removed while Vcc remains valid without danger of triggering a reset pulse The device does not enter battery backup mode when Vcc stays above the reset threshold voltage Negative Going Vcc Transients These supervisors are relatively immune to short dura tion negative going Vcc transients Resetting the uP when Vcc experiences only small glitches is usually not desirable The Typical Operating Characteristics section shows a graph of Maximum Transient Duration vs Reset Threshold Overdrive for which reset is not asserted The graph was produced using negative going Vcc pulses starting at Vcc and ending below the reset threshold by the magnitude indicated reset threshold overdrive The graph shows the maximum pulse width Table 1 Reset Threshold Ranges RESET THRESHOLD RANGES V SUFFIX MIN TYP MAX 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 Table 2 Input and Output Status in Battery Backup Mode PIN STATUS Vcc Disconnected from OUT OUT
3. except at startup MAXIM 3 P9 9XVW E9E9XVMW L9 9XVIW MAX6361 MAX6363 MAX6364 SOT23 Low Power Supervisory Circuits with Battery Backup Typical Operating Characteristics TA 25 C unless otherwise noted SUPPLY CURRENT vs TEMPERATURE BATTERY SUPPLY CURRENT BATTERY TO OUT ON RESISTANCE NO LOAD BACKUP MODE vs TEMPERATURE vs TEMPERATURE 8 7 8 3 5 5 z amp t5 Vgarr 2 0V a a 2 gt Ga 3 0 gt ES 3 2 8V c a gt 2 Es P 5 Vaart 5 0V 1 lout 25mA 0 0 40 20 0 20 40 60 8 40 20 0 20 40 60 8 40 20 0 20 40 60 8 EMPERATURE C EMPERATURE C EMPERATURE C Vec TO OUT ON RESISTANCE RESET TIMEOUT PERIOD TO RESET PROPAGATION DELAY vs TEMPERATURE vs TEMPERATURE vs TEMPERATURE 210 s 155 8 E 8 FALLING 5 E 3 8 120 8 amp E 7 Bi z105 0 25V ms 5 t 2 90 22 a 25 E 5 200 5 2 60 E 3 to S 45 E D 195 x 1V ms E eS 190 0 40 20 0 2 40 60 8 40 20 0 2 40 60 8 40 20 0 20 40 60 8 TEMPERATURE C EMPERATURE C T
4. Connected to BATT Connected to OUT Current drawn from BATT he battery is less than 1pA at VBATT 2 8V excluding louT when Vcc 0 RESET RESET Asserted BATT ON High state MR RESET IN nputs ignored MAXIM SOT23 Low Power Supervisory Circuits with Battery Backup Selector Guide P9 9XVW E9E9XVMW L9 9XVIW BART MANUAL RESET INPUT BATT RESET RESET RESET RESET MR ON IN PUSH PULL OPEN DRAIN PUSH PULL MAX6361LUT__ AX6361PUT__ AX6361HUT__ MAX6363LUT__ AX6363PUT__ 7 6 _ 7 7 MAX6364LUT__ 7 AX6364PUT_ _ 7 6 6 _ 7 Device Marking Codes PART TOP MARK PART TOP MARK PART TOP MARK MAX6361LUT23 AAE MAX6363LUT23 AAFS MAX6364LUT23 AAGK AX6361LUT26 AAEH MAX6363LUT26 AAFR MAX6364LUT26 AAGJ AX6361LUT29 AAEG MAX6363LUT29 AAFQ MAX6364LUT29 AAGI AX6361LUT31 AAEF MAX6363LUT31 AAFP MAX6364LUT31 AAGH AX6361LUT44 AAEE MAX6363LUT44 AAFO MAX6364LUT44 AAGG AX6361LUT46 AAED MAX6363LUT46 AAFN MAX6364LUT46 AAGF AX6361PUT23 AAEO MAX6363PUT23 AAFY MAX6364PUT23 AAGQ AX6361PUT26 AAEN MAX6363PUT26 AAFX MAX6364PUT26 AAGP AX6361PUT29 AAE MAX6363PUT29 AAFW MAX6364PUT29 AAGO AX6361PUT31 AAEL MAX6363PUT31 AAFV MAX6364PUT31 AAGN AX6361PUT44 AAEK MAX6363PUT44 AAFU MAX6364PUT44 AAGM AX6361PUT46 AAEJ MAX6363P
5. MOTE 6 NOTE ALL DIMENSIONS IM MILLIMETERS 3 EXDLUSIvE OF FLASH amp PETAL PACKAGE OUTLINE IMELUSTV E PTS L LOWER LEFT PIN IHE LEFT RIGHT CREE ERLE Tur MARO LI d i MM PB NM LOCATED ANIYE MAXIM PACKAGE OUTLINE STE pass iW 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 8 Maxim Integrated Products 120 San Gabriel Drive Sunnyvale CA 94086 408 737 7600 2000 Maxim Integrated Products Printed USA AAAXLM is registered trademark of Maxim Integrated Products
6. data sheet MAXIM with Battery Backup Features Low 1 2V Operating Supply Voltage Vcc or VBATT Precision Monitoring of 5 0V 3 3V 3 0V and 2 5V Power Supply Voltages Debounced Manual Reset Input MAX6361 Battery On Output Indicator MAX6363 Auxiliary User Adjustable RESET IN MAX6364 Three Available Output Structures Push Pull RESET Open Drain RESET Push Pull RESET RESET RESET Valid Down to 1 2V Guaranteed Vcc or VBATT Power Supply Transient Immunity 150ms min Reset Timeout Period Small 6 Pin SOT23 Package 9 Ordering Information PART TEMP RANGE PIN PACKAGE MAX6361LUT _ T 40 C to 85 C 6 SOT23 6 AX6361PUT T 40 C to 85 C 6 SOT23 6 AX6361HUT_ _ T 40 C to 85 C 6 SOT23 6 MAX6363LUT_ _ T 40 C to 85 C 6 SOT23 6 AX6363PUT_ _ T 40 C to 85 C 6 SOT23 6 6 6 _ 40 C to 85 C 6 SOT23 6 MAX6364LUT_ _ T 40 C to 85 C 6 SOT23 6 AX6364PUT_ _ T 40 C to 85 C 6 SOT23 6 AX6364HUT_ _ 40 C to 85 C 6 SOT23 6 Note These parts offer a choice of reset threshold voltages From Table 1 select the suffix corresponding to the desired threshold voltage and insert it into the part number to complete it When ordering from the factory there is a 2500 piece mini mum on the SOT package only Maxim Integrated Products 1 For free samples and the latest lite
7. EMPERATURE C RESET THRESHOLD MAXIMUM TRANSIENT DURATION BATTERY SUPPLY CURRENT vs TEMPERATURE vs RESET THRESHOLD OVERDRIVE vs SUPPLY VOLTAGE E 400 2 2 636 46 8 E E amp 9 P 2 E m S 300 a BS gt B 250 amp 636 46 3 2 200 8 amp g RESET OCCURS E amp 150 ABOVE CURVE a e MAX636_26 100 E E a 50 AX636 26 0 40 20 0 20 40 6 80 1 10 00 1k 10k EMPERATURE C RESET THRESHOLD OVERDRIVE Vr Voc mV SOT23 Low Power Supervisory Circuits with Battery Backup Typical Operating Characteristics continued TA 25 C unless otherwise noted MAX6364 RESET IN THRESHOLD vs TEMPERATURE MAX6364 RESET IN TO RESET PROPAGATION DELAY vs TEMPERATURE 1 236 E 50 E E 25 J 5 22 c 2 1 235 5 4g lt S 16 13 1 234 10 40 20 0 20 40 60 80 40 20 0 20 40 60 80 TEMPERATURE C TEMPERATURE C Pin Description PIN NAME FUNCTION Active High Reset Output for H versions RESET remains high while Vcc is below the reset threshold RESET and for at least 150ms trp after Vcc rises above the reset threshold RESET also asserts when or RESET IN is low Active Low Reset Output for L and P versions RESET remains low while Vcc is below the rese
8. TICS Vcc 2 4V to 5 5V Ta 40 C to 85 C reset not asserted typical values are at Ta 25 C unless otherwise noted Note 1 PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS 2 age Range oa No load Note 2 0 5 5 V Vcc 2 8V 10 30 2 Ice Noload Vcc gt Viu Voc 3 6V 11 35 Vcc 5 5V 15 50 i B 2 TA 25 C 1 ae ISUPPIDY Veo 0 pe TA 40 C to 85 C 3 m 5 5V gt Vcc gt Ta 25 C 0 1 0 02 bani 020 Ta 40 C to 85 C 10 002 Vcc 4 75V louT lt 150mA 1 25 Vcc to OUT On Resistance RON Vcc 3 15V lout 65mA 2 25 Q Vcc 2 38V louT lt 25mA 4 6 VBATT 4 5V lout lt 20mA 0 2 Vour in Battery Backup Mode VBATT 3 0V louT 10mA VBATT 0 15 V VBATT 2 25V IOUT 5mA VBATT 0 15 Battery Switchover Threshold Wena Vis Power up 20 ay Vcc VBATT Power down 20 MAX636_UT46 4 50 4 63 4 75 MAX636_UT44 4 25 4 38 4 50 MAX636_UT31 3 00 3 08 3 15 Reset Threshold VTH V 636 UT29 2 85 2 93 3 00 MAX636 UT26 2 55 2 63 2 70 636 UT23 2 25 2 32 2 38 Vcc Falling Reset Delay Vcc falling at 10V ms 35 us Reset Active Timeout Period tRP 150 280 ms SOT23 Low Power Supervisory Circuits with Battery Backup ELECTRICAL CHARACTERISTICS continued Vcc 2 4V to 5 5V TA 40 C to 85 re
9. UT46 AAFT MAX6364PUT46 AAGL AX6361HUT23 AAEU MAX6363HUT23 AAGE MAX6364HUT23 AAGW AX6361HUT26 AAET MAX6363HUT26 AAGD MAX6364HUT26 AAGV AX6361HUT29 AAES MAX6363HUT29 AAGC MAX6364HUT29 AAGU AX6361HUT31 AAER MAX6363HUT31 AAGB MAX6364HUT31 AAGT AX6361HUT44 AAEQ MAX6363HUT44 AAGA MAX6364HUT44 AAGS AX6361HUT46 AAEP MAX6363HUT46 AAFZ MAX6364HUT46 AAGR Sample stock generally held on standard versions only Contact factory for availability of nonstandard versions A O 1yF bypass capacitor mounted close to the Vcc pin provides additional transient immunity that a negative going Vcc transient can typically have without triggering a reset pulse As the amplitude of the transient increases i e 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 for 30us will not trigger a reset pulse MAXIM 7 MAX6361 MAX6363 MAX6364 SOT23 Low Power Supervisory Circuits with Battery Backup Pin Configurations continued Typical Operating Circuit TOP VIEW UNREGULATED 24 1055 DC VOLTAGE RESET RESET MAXIM MAX6363 Vcc Vcc RESET RESET uP GND RESET IN MAXIM MAX6364 3 6V Li BATTERY RESET RESET MAXIM MAX6364 Chip Information TRANSISTOR COUNT 720 SOT23 6 Package Information SEE 5 EXAMPLE TOP nes FIN 1 LI DOT SEE
10. c circuitry to initiate a reset For the MAX6361 a logic low on MR asserts reset Reset remains asserted while MR is low and for a minimum of 150ms tnp after it returns high MR has an internal 20kQ pull up resistor This input can be driven with TTL CMOS logic levels or with open drain collector outputs Connect a normally open momentary switch from MR to GND to create a manual reset function external debounce circuitry is not required If MR is driven from long cables or the device is used in a noisy environment connect a O 1uF capaci tor from MR to GND to provide additional noise immunity Reset In MAX6364 only RESET IN is compared to an internal 1 235V reference If the voltage at RESET IN is less than 1 235V reset is asserted The RESET IN comparator may be used as an undervoltage detector to signal a failing power sup ply It can also be used as a secondary power supply reset monitor Reset Output A uP s reset input starts the uP in a known state Th MAX6361 MAX6363 MAX6364 UP supervisory circui assert a reset to prevent code execution errors during power up power down and brownout conditions RESET is guaranteed to be a logic low or high depend ing on the device chosen see Ordering Information RESET or RESET asserts when Vcc is below the reset threshold and for at least 150ms tnp after Vcc rises above the reset threshold RESET or RESET also asserts when MR is low MAX6361 and when RESET IN is less than 1 235V
11. is greater than the reset threshold or to the greater of Vcc or VBATT when VCC is less than the reset threshold OUT can supply up MAXIM to 150 from Vcc When Vcc is higher than VBATT the BATT ON MAX6363 output is low When Vcc is lower than VBATT an internal MOSFET connects the backup battery to OUT The on resistance of the MOSFET is a function of backup battery voltage and is shown in the Battery to Out On Resistance vs Temperature graph in the Typical Operating Characteristics section P9 9XVW E9E9XVMW L9 9XVIW MAX6361 MAX6363 MAX6364 SOT23 Low Power Supervisory Circuits with Battery Backup Backup Battery Switchover In a brownout or power failure it may be necessary to preserve the contents of the RAM With a backup bat tery installed at BATT the MAX6361 MAX6363 MAX6364 automatically switch the RAM to backup power when Vcc falls The MAX6363 has a BATT ON output that goes high when in battery backup mode These devices require two conditions before switching to battery backup mode 1 Vcc must be below the reset threshold 2 Vcc must be below Table 2 lists the status of the inputs and outputs in battery backup mode The device will not power up if the only voltage source is on BATT OUT will only power up from Vcc at startup Manual Reset Input MAX6361 only Many products require manual reset capabili ty allowing the operator a test technician or external logi
12. rature visit www maxim ic com or phone 1 800 998 8800 For small orders phone 1 800 835 8769 P9 9XVW E9E9XVMW L9 9XVIW MAX6361 MAX6363 MAX6364 SOT23 Low Power Supervisory Circuits with Battery Backup ABSOLUTE MAXIMUM RATINGS Terminal Voltages with respect to GND Output Current BATI OUT eicere tees 0 3V to 6V Os RESET open 0 3V to 6V RESET RESET BATT ON BATT ON MR RESET IN 0 3V to Vour 0 3V Continuous Power Dissipation TA 70 C RESET tti hen 0 3V to VouT 0 3V 6 SOT23 derate 8 70mW C above 70 C Input Current Operating Temperature Range NERO UTR LEES 1A 6 6 denise VC 250mA Storage Temperature Range BATT Peak Lead Temperature soldering 10s BATT Continuous Short Circuit Protection for up to 10s 40 C to 85 C 65 C to 150 C 300 C 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 CHARACTERIS
13. set not asserted typical values are at TA 25 C unless otherwise noted Note 1 PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS ISINK 1 6mA 03 V Reset asserted Vcc 2 2 1V l OL 0 100A BEGET SINK HA RESET Output Voltage Vcc gt 1 2V 0 4 V Reset not asserted ISOURCE 5 VOH MAX636_L only Voc 2 VTH MAX 08 ISOURCE 200HA 0 7 Vcc Reset asserted Vcc 2 1 2V VOH Varr 0 1 SOURCE 1 RESET Output Voltage Vcc gt 1 8V 0 8 Vcc V ISINK 1 V Reset not asserted 0 3 gt VTH MAX RESET Output Leakage Current ILK MAX636_P only 1 UA MANUAL RESET MAX6361 only o2 VIL 0 3 V MR Input Voltage V VIH 0 7 Vcc Pull Up Resistance 20 kQ Minimum Pulse Width 1 us Glitch Immunity Voc 3 3V 100 ns MR to Reset Delay 3 3V 120 ns BATT ON MAX6363 only Output Voltage VoL ISINK 3 2mA VBATT 2 1V 0 4 V Sink current Vcc 5V 60 mA Output Short Circuit Current ES Source current VBATT 2 2V 10 30 100 UA RESET IN MAX6364 only Input Threshold 1 185 1 285 1 285 V RESET IN Leakage Current 0 01 25 nA RESET IN to Reset Delay Overdrive voltage 50mV RESET IN falling 1 5 Us Note 1 Overtemperature limits are guaranteed by design and not production tested Note 2 can be 0 anytime or Vcc can go down to 0 if VBATT is active
14. t thresh RESET old and for at least 150ms trp after Vcc rises above the reset threshold RESET also asserts when MR or RESET IN is low 2 GND Ground 2 2 6361 Manual Reset Input Maintaining logic low on MR asserts a reset Reset output remains assert MR ed for at least 150ms trp after MR transitions from low to high Leave unconnected or connected to Vcc if not used 3 BATT ON MAX6363 Battery On Output BATT ON goes high in battery backup mode RESET IN MAX6364 Reset Input When RESET IN falls below 1 235V reset is asserted Reset output remains 7 asserted as long as RESET IN is low and for at least 150ms trp after RESET IN goes high A V Supply Voltage Reset is asserted when Vcc drops below the reset threshold voltage VTH Reset remains asserted until Vcc rises above and for at least 150ms after Vcc rises above VTH Output OUT sources from Vcc when it is above the reset threshold VrH and from the greater of Vcc or 5 OUT BATT when Vcc is below VTH Backup Battery Input When Vcc falls below the reset threshold BATT switches to OUT if VBATT is 20mV 6 BATT greater than Vcc When Vcc rises 20mV above Vcc switches to OUT The 40mV hysteresis prevents repeated switching if Vcc falls slowly Detailed Description The Typical Operating Circuit shows a typical connec tion for the MAX6361 MAX6363 MAX6364 family OUT powers the static random access memory SRAM OUT is internally connected to Vcc if Vcc
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MAXIM MAX6361/MAX6363/MAX6364 handbook