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19-1615; Rev 2; 7/00
SOT23, Low-Power P Supervisory Circuits with Battery Backup
General Description
The MAX6361-MAX6364 supervisory circuits reduce the complexity and number of components required for power-supply monitoring and battery control functions in microprocessor (P) systems. The circuits significantly improve system reliability and accuracy compared to that obtainable with separate ICs or discrete components. Their functions include P reset, backup battery switchover, and power failure warning. The MAX6361-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), watchdog timer input (MAX6362), 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 opendrain reset (see Selector Guide at end of data sheet).
Features
o Low +1.2V Operating Supply Voltage (VCC or VBATT) o Precision Monitoring of +5.0V, +3.3V, +3.0V, and +2.5V Power-Supply Voltages o Debounced Manual Reset Input (MAX6361) o Watchdog Timer with 1.6s Timeout Period (MAX6362) o Battery-On Output Indicator (MAX6363) o Auxiliary User-Adjustable RESET IN (MAX6364) o Three Available Output Structures Push-Pull RESET, Open-Drain RESET, Open-Drain RESET o RESET/RESET Valid Down to 1.2V Guaranteed (VCC or VBATT) o Power-Supply Transient Immunity o 150ms (min) Reset Timeout Period o Small 6-Pin SOT23 Package
MAX6361-MAX6364
Ordering Information Applications
Computers Controllers Intelligent Instruments Critical P/C Power Monitoring Fax Machines Industrial Control POS Equipment Portable/Battery-Powered Equipment
PART MAX6361LUT_ _-T MAX6361PUT_ _-T MAX6361HUT_ _-T MAX6362LUT_ _-T MAX6362PUT_ _-T MAX6362HUT_ _-T MAX6363LUT_ _-T MAX6363PUT_ _-T MAX6363HUT_ _-T MAX6364LUT_ _-T MAX6364PUT_ _-T MAX6364HUT_ _-T
RESET, RESET 1 6 BATT
TEMP. RANGE -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C
PIN-PACKAGE 6 SOT23-6 6 SOT23-6 6 SOT23-6 6 SOT23-6 6 SOT23-6 6 SOT23-6 6 SOT23-6 6 SOT23-6 6 SOT23-6 6 SOT23-6 6 SOT23-6 6 SOT23-6
Pin Configurations
TOP VIEW
GND 2
MAX6361
5
OUT
Note: These parts offer a choice of reset threshold voltages. From the table below, 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 2500piece minimum on the SOT package (tape-and-reel only). RESET THRESHOLD RANGES (V) MIN 4.50 4.25 3.00 2.85 2.55 2.25 TYP 4.63 4.38 3.08 2.93 2.63 2.32 MAX 4.75 4.50 3.15 3.00 2.70 2.38 1
MR 3
4
VCC
SUFFIX 46
SOT23-6 Pin Configurations continued at end of data sheet. Selector Guide appears at end of data sheet. Typical Operating Circuit appears at end of data sheet.
44 31 29 26 23
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SOT23, Low-Power P Supervisory Circuits with Battery Backup MAX6361-MAX6364
ABSOLUTE MAXIMUM RATINGS
Terminal Voltages (with respect to GND) VCC, BATT, OUT.......................................................-0.3V to +6V RESET (open drain), RESET (open drain) ................-0.3V to +6V BATT ON, RESET (push-pull), RESET IN, WDI.......................................................-0.3V to (VOUT + 0.3V) MR .............................................................-0.3V to (VCC + 0.3V) Input Current VCC Peak ............................................................................1A VCC Continuous ............................................................250mA BATT Peak ....................................................................250mA BATT Continuous ............................................................40mA GND ................................................................................75mA Output Current OUT................................Short-Circuit Protection for up to 10s RESET, RESET, BATT ON ..............................................20mA Continuous Power Dissipation (TA = +70C) 6-Pin SOT23 (derate 8.70mW/C above +70C) .........696mW Operating Temperature Range ...........................-40C to +85C Junction Temperature ......................................................+150C Storage Temperature Range .............................-65C to +150C 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 = +2.4V to +5.5V, VBATT = 3V, TA = -40C to +85C, reset not asserted. Typical values are at TA = +25C, unless otherwise noted.) (Note 1) PARAMETER Operating Voltage Range, VCC or VBATT Supply Current (Excluding IOUT) ISUPPLY in Battery-Backup Mode (Excluding IOUT) BATT Standby Current SYMBOL VCC, VBATT ICC CONDITIONS No load (Note 2) No load, VCC > VTH, WDI = VCC or GND (MAX6362) VBATT = 2.8V, VCC = 0 5.5V > VCC > (VBATT + 0.2V) VCC = 2.8V VCC = 3.6V VCC = 5.5V TA = +25C TA = -40C to +85C TA = +25C TA = -40C to +85C -0.1 -1.0 MIN 0 10 11 15 TYP MAX 5.5 30 35 50 1 3 0.02 0.02 2.75 3.0 4.6 VBATT - 0.2 VBATT - 0.15 VBATT - 0.15 20 -20 4.50 4.25 3.00 2.85 2.55 2.25 150 4.63 4.38 3.08 2.93 2.63 2.32 35 280 4.75 4.50 3.15 3.00 2.70 2.38 s ms V mV V A A A UNITS V
ISUPPLY IBATT
VCC = 4.75V, IOUT 150mA VCC to OUT On-Resistance RON VCC = 3.15V, IOUT 65mA VCC = 2.38V, IOUT 25mA VBATT = 4.5V, IOUT 20mA VOUT in Battery-Backup Mode Battery-Switchover Threshold (VCC - VBATT) VBATT = 3.0V, IOUT 10mA VBATT = 2.25V, IOUT 5mA VCC < VTH MAX636_UT46 MAX636_UT44 Reset Threshold VTH MAX636_UT31 MAX636_UT29 MAX636_UT26 MAX636_UT23 VCC Falling Reset Delay Reset-Active Timeout Period tRP VCC falling at 10V/ms Power-up Power-down
2
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SOT23, Low-Power P Supervisory Circuits with Battery Backup
ELECTRICAL CHARACTERISTICS (continued)
(VCC = +2.4V to +5.5V, VBATT = 3V, TA = -40C to +85C, reset not asserted. Typical values are at TA = +25C, unless otherwise noted.) (Note 1) PARAMETER SYMBOL Reset asserted, VBATT = 0 Reset not asserted (MAX636_L only) Reset not asserted CONDITIONS ISINK = 1.6mA, VCC 2.1V ISINK = 100A, VCC 1.2V ISOURCE = 500A, VCC VTH(MAX) ISINK = 1.6mA, VCC VTH(MAX) 0.8 VCC 0.3 1 V A MIN TYP MAX 0.3 0.4 V UNITS
MAX6361-MAX6364
VOL RESET Output Voltage VOH RESET Output Voltage RESET, RESET Output Leakage Current MANUAL RESET (MAX6361 only) MR Input Voltage Pull-Up Resistance Minimum Pulse Width Glitch Immunity MR to Reset Delay WATCHDOG INPUT (MAX6362 only) Watchdog Timeout Period Minimum WDI Input Pulse Width Input Voltage BATT ON (MAX6363 only) Output Voltage Output Short-Circuit Current RESET IN (MAX6364 only) Input Threshold RESET IN Leakage Current RESET IN to Reset Delay VOL tWD tWDI VIL VIH VIL VIH VOL ILK
MAX636_P, MAX636_H only
0.3 VCC 0.7 VCC 20 1 VCC = 3.3V VCC = 3.3V 1.00 100 0.3 VCC 0.7 VCC ISINK = 3.2mA, VBATT = 2.1V Sink current, VCC = 5V Source current, VBATT 2V 10 1.185 Overdrive voltage = 50mV, RESET IN falling 60 30 1.235 0.01 1.5 100 1.285 25 0.4 100 120 1.60 2.25
V k s ns ns s ns V
V mA A V nA s
Note 1: All devices are 100% production tested at TA = +25C. Limits over temperature are guaranteed by design. Note 2: VBATT can be 0 anytime or VCC can go down to 0 if VBATT is active (except at startup).
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3
SOT23, Low-Power P Supervisory Circuits with Battery Backup MAX6361-MAX6364
Typical Operating Characteristics
(TA = +25C, unless otherwise noted.)
SUPPLY CURRENT vs. TEMPERATURE (NO LOAD)
MAX6361 toc01
BATTERY SUPPLY CURRENT (BACKUP MODE) vs. TEMPERATURE
VCC = 0 VBATT = 2.8V
MAX6361 toc02
BATTERY TO OUT ON-RESISTANCE vs. TEMPERATURE
MAX6361 toc03
20
1.2 BATTERY SUPPLY CURRENT (A) 1.0 0.8 0.6 VBATT = 2.0V 0.4 0.2 0
7 BATT TO OUT ON-RESISTANCE () 6 5 VBATT = 2.0V 4 3 2 VBATT = 5.0V 1 0 IOUT = 25mA VCC = 0 -40 -20 0 20 40 60 80 VBATT = 2.8V
SUPPLY CURRENT (A)
18
16
14 VBATT = 0 VCC = 5.0V -40 -20 0 20 40 60 80 TEMPERATURE (C)
12
-40
-20
0
20
40
60
80
TEMPERATURE (C)
TEMPERATURE (C)
VCC TO OUT ON-RESISTANCE vs. TEMPERATURE
MAX6361 toc04
RESET TIMEOUT PERIOD vs. TEMPERATURE
MAX6361 toc05
VCC TO RESET PROPAGATION DELAY vs. TEMPERATURE
135 120 PROPAGATION DELAY (s) 105 90 75 60 45 30 15 10V/ms -40 -20 0 20 40 60 80 1V/ms VCC FALLING 0.25V/ms
MAX6361 toc06
1.2 VOUT TO OUT ON-RESISTANCE () VCC = 2.3V IOUT = 25mA 0.9
210
RESET TIMEOUT PERIOD (ms)
205
0.6 VCC = 4.5V IOUT = 150mA 0.3
VCC = 3.0V IOUT = 65mA
200
195
0 -40 -20 0 20 40 60 80 TEMPERATURE (C)
190 -40 -20 0 20 40 60 80 TEMPERATURE (C)
0 TEMPERATURE (C)
MAX6362 WATCHDOG TIMEOUT PERIOD vs. TEMPERATURE
MAX6361toc06a
RESET THRESHOLD vs. TEMPERATURE
MAX6361 toc07
MAXIMUM TRANSIENT DURATION vs. RESET THRESHOLD OVERDRIVE
MAXIMUM TRANSIENT DURATION (s) 350 300 250 MAX636_46 200 150 100 50 0 1 MAX636_26 10 100 1k 10k RESET OCCURS ABOVE CURVE
MAX6361 toc08
2.0 WATCHDOG TIMEOUT PERIOD (s) 1.9 1.8 1.7 1.6 1.5 1.4 1.3 1.2 -40 -20 0 20 40 60 80 TEMPERATURE (C)
5.0 MAX636_46 4.5 THRESHOLD (V) 4.0 3.5 3.0 MAX636_26 2.5 2.0 -40 -20 0 20 40 60 80 TEMPERATURE (C)
400
RESET THRESHOLD OVERDRIVE VTH - VCC (mV)
4
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SOT23, Low-Power P Supervisory Circuits with Battery Backup
Typical Operating Characteristics (continued)
(TA = +25C, unless otherwise noted.)
BATTERY SUPPLY CURRENT vs. SUPPLY VOLTAGE
MAX6361 toc09
MAX6361-MAX6364
MAX6364 RESET IN THRESHOLD vs. TEMPERATURE
MAX6361 toc10
MAX6364 RESET IN TO RESET PROPAGATION DELAY vs. TEMPERATURE
2.8 PROPAGATION DELAY (s) 2.5 2.2 1.9 1.6 1.3 VOD = 50mV
MAX6361 toc11
10 9 BATTERY SUPPLY CURRENT (A) 8 7 6 5 4 3 2 1 0 0 VBATT = 2.3V 1 2 VCC (V) 3 4 VBATT = 2.5V VBATT = 2.8V VTH = 2.93V
1.236
THRESHOLD (V)
1.235
1.234 -40 -20 0 20 40 60 80 TEMPERATURE (C)
1.0 -40 -20 0 20 40 60 80 TEMPERATURE (C)
Pin Description
PIN NAME FUNCTION Active-High Reset Output. RESET is continuously high when VCC is below the reset threshold (VTH), MR is low, or RESET IN is low. It asserts in pulses when the internal watchdog times out. RESET remains high for the reset timeout period (tRP) after VCC rises above the reset threshold, after the manual reset input goes from low to high, after RESET IN goes high, or after the watchdog triggers a reset event. The MAX636_H is an active-high open-drain output. Active-Low Reset Output. RESET is continuously low when VCC is below the reset threshold (VTH), MR is low, or RESET IN is low. It asserts in pulses when the internal watchdog times out. RESET remains low for the reset timeout period (tRP) after VCC rises above the reset threshold, after the manual reset input goes from low to high, after RESET IN goes high, or after the watchdog triggers a reset event. The MAX636_L is an active-low push-pull output while the MAX636_P is an active-low open-drain output. Ground MAX6361 Manual-Reset Input. Maintaining logic low on MR asserts a reset. Reset output remains asserted for at least 150ms (tRP) after MR transitions from low to high. Leave unconnected or connected to VCC if not used. MAX6362 Watchdog Input. If WDI remains high or low for longer than the watchdog timeout period (tWD), the internal watchdog timer runs out and a reset pulse is triggered for the reset timeout period (tRP) (Figure 1). The internal watchdog clears whenever reset asserts or whenever WDI sees a rising or falling edge. MAX6363 Battery-On Output. BATT ON goes high in battery backup mode. MAX6364 Reset Input. When RESET IN falls below 1.235V, reset is asserted. Reset output remains asserted as long as RESET IN is low and for at least 150ms (tRP) after RESET IN goes high. Supply Voltage, 0 to 5.5V. Reset is asserted when VCC drops below the reset threshold voltage (VTH). Reset remains asserted until VCC rises above VTH and for at least 150ms after VCC rises above VTH. Output. OUT sources from VCC when it is above the reset threshold (VTH), and from the greater of VCC or BATT when VCC is below VTH. Backup-Battery Input. When VCC falls below the reset threshold, BATT switches to OUT if VBATT is 20mV greater than VCC. When VCC rises 20mV above VBATT, VCC switches to OUT. The 40mV hysteresis prevents repeated switching if VCC falls slowly. _______________________________________________________________________________________ 5
RESET
1 RESET
2
GND MR
3
WDI BATT ON RESET IN
4 5
VCC OUT
6
BATT
SOT23, Low-Power P Supervisory Circuits with Battery Backup MAX6361-MAX6364
Detailed Description
The Typical Operating Circuit shows a typical connection for the MAX6361-MAX6364 family. OUT powers the static random-access memory (SRAM). OUT is internally connected to VCC if VCC 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 to 150mA 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. (high to low or low to high) within the watchdog timeout period (tWD) with a 100ns minimum pulse width clears the watchdog timer. If WDI remains high or low for longer than the watchdog timeout period, the internal watchdog timer runs out and a reset pulse is triggered for the reset timeout period (tRP). The internal watchdog timer clears whenever reset asserts or the WDI sees a rising or falling edge within the watchdog timeout period. If WDI remains in a high or low state for an extended period of time, a reset pulse asserts after every watchdog timeout period (tWD) (Figure 1).
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 supply. It can also be used as a secondary power-supply reset monitor. To program the reset threshold (VRTH) of the secondary power supply, use the following equation (see Typical Operating Circuit): R1 VRTH = VREF + 1 R2 where VREF = 1.235V. To simplify the resistor selection, choose a value for R2 and calculate R1: R1 = R2
Backup-Battery Switchover
In a brownout or power failure, it may be necessary to preserve the contents of the RAM. With a backup battery installed at BATT, the MAX6361-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 batterybackup mode: 1) VCC must be below the reset threshold. 2) VCC must be below VBATT. Table 1 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.
[(VRTH / VREF ) - 1]
Manual Reset Input (MAX6361 Only)
Many P-based products require manual reset capability, allowing the operator, a test technician, or external logic 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 (tRP) after it returns high. MR has an internal 20k pull-up resistor to VCC. 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 0.1F capacitor from MR to GND to provide additional noise immunity.
Since the input current at RESET IN is 25nA (max), large values (up to 1M) can be used for R2 with no significant loss in accuracy. For example, in the Typical
Table 1. Input and Output Status in Battery-Backup Mode
PIN VCC OUT BATT RESET/RESET BATT ON MR, RESET IN, WDI STATUS Disconnected from OUT Connected to BATT Connected to OUT. Current drawn from the battery is less than 1A (at VBATT = 2.8V, excluding IOUT) when VCC = 0. Asserted High state Inputs ignored
Watchdog Input (MAX6362 Only)
The watchdog monitors P activity through the input WDI. If the P becomes inactive, the reset output is asserted in pulses. To use the watchdog function, connect WDI to a bus line or P I/O line. A change of state
6
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SOT23, Low-Power P Supervisory Circuits with Battery Backup
Operating Circuit, the MAX6362 monitors two supply voltages. To monitor the secondary 5V logic or analog supply with a 4.60V nominal programmed reset threshold, choose R2 = 100k, and calculate R1 = 273k. 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 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 30s will not trigger a reset pulse. A 0.1F bypass capacitor mounted close to the VCC pin provides additional transient immunity.
MAX6361-MAX6364
Reset Output
A P's reset input starts the P in a known state. The MAX6361-MAX6364 P supervisory circuits assert a reset to prevent code-execution errors during powerup, power-down, and brownout conditions. RESET is guaranteed to be a logic low or high depending on the device chosen (see Ordering Information). RESET or RESET asserts when VCC is below the reset threshold and for at least 150ms (tRP) 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 (MAX6364). The MAX6362 watchdog function will cause RESET (or RESET) to assert in pulses following a watchdog timeout (Figure 1).
Applications Information
Operation Without a Backup Power Source
The MAX6361-MAX6364 were designed for batterybacked 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 0.1F 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-duration, negative-going VCC transients. Resetting the P
WDI
tRP tWD RESET tWD
tRP
tWD = WATCHDOG TIMEOUT PERIOD tRP = RESET TIMEOUT PERIOD
Figure 1. MAX6362 Watchdog Timeout Period and Reset Active Time
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7
SOT23, Low-Power P Supervisory Circuits with Battery Backup MAX6361-MAX6364
Watchdog Software Considerations (MAX6362 Only)
To help the watchdog timer monitor software execution more closely, set and reset the watchdog input at different points in the program, rather than "pulsing" the watchdog input low-high-low. This technique avoids a "stuck" loop, in which the watchdog timer would continue to be reset within the loop, keeping the watchdog from timing out. Figure 2 shows an example of a flow diagram where the I/O driving the WDI is set low at the beginning of the program, set high at the beginning of every subroutine or loop, then set low again when the program returns to the beginning. If the program should "hang" in any subroutine, the problem would quickly be corrected, since the I/O is continually set low and the watchdog timer is allowed to time out, triggering a reset.
START
SET WDI LOW
SUBROUTINE OR PROGRAM LOOP SET WDI HIGH
RETURN
END
Figure 2. Watchdog Flow Diagram
8
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SOT23, Low-Power P Supervisory Circuits with Battery Backup
Selector Guide
PART MANUAL RESET INPUT MR WATCHDOG INPUT WDI BATT ON RESET IN RESET PUSHPULL RESET OPEN DRAIN RESET OPEN DRAIN
MAX6361-MAX6364
MAX6361LUT_ _ MAX6361PUT_ _ MAX6361HUT_ _ MAX6362LUT_ _ MAX6362PUT_ _ MAX6362HUT_ _ MAX6363LUT_ _ MAX6363PUT_ _ MAX6363HUT_ _ MAX6364LUT_ _ MAX6364PUT_ _ MAX6364HUT_ _
Device Marking Codes
PART MAX6361LUT23 MAX6361LUT26 MAX6361LUT29* MAX6361LUT31 MAX6361LUT44 MAX6361LUT46* MAX6361PUT23 MAX6361PUT26 MAX6361PUT29* MAX6361PUT31 MAX6361PUT44 MAX6361PUT46* MAX6361HUT23 MAX6361HUT26 MAX6361HUT29 MAX6361HUT31 MAX6361HUT44 MAX6361HUT46* TOP MARK AAEI AAEH AAEG AAEF AAEE AAED AAEO AAEN AAEM AAEL AAEK AAEJ AAEU AAET AAES AAER AAEQ AAEP PART MAX6362LUT23 MAX6362LUT26 MAX6362LUT29* MAX6362LUT31 MAX6362LUT44 MAX6362LUT46* MAX6362PUT23 MAX6362PUT26 MAX6362PUT29* MAX6362PUT31 MAX6362PUT44 MAX6362PUT46* MAX6362HUT23 MAX6362HUT26 MAX6362HUT29 MAX6362HUT31 MAX6362HUT44 MAX6362HUT46* TOP MARK AAFA AAEZ AAEY AAEX AAEW AAEV AAFG AAFF AAFE AAFD AAFC AAFB AAFM AAFL AAFK AAFJ AAFI AAFH PART MAX6363LUT23 MAX6363LUT26 MAX6363LUT29* MAX6363LUT31 MAX6363LUT44 MAX6363LUT46* MAX6363PUT23 MAX6363PUT26 MAX6363PUT29* MAX6363PUT31 MAX6363PUT44 MAX6363PUT46* MAX6363HUT23 MAX6363HUT26 MAX6363HUT29 MAX6363HUT31 MAX6363HUT44 MAX6363HUT46* TOP MARK AAFS AAFR AAFQ AAFP AAFO AAFN AAFY AAFX AAFW AAFV AAFU AAFT AAGE AAGD AAGC AAGB AAGA AAFZ PART MAX6364LUT23 MAX6364LUT26 MAX6364LUT29* MAX6364LUT31 MAX6364LUT44 MAX6364LUT46* MAX6364PUT23 MAX6364PUT26 MAX6364PUT29* MAX6364PUT31 MAX6364PUT44 MAX6364PUT46* MAX6364HUT23 MAX6364HUT26 MAX6364HUT29 MAX6364HUT31 MAX6364HUT44 MAX6364HUT46* TOP MARK AAGK AAGJ AAGI AAGH AAGG AAGF AAGQ AAGP AAGO AAGN AAGM AAGL AAGW AAGV AAGU AAGT AAGS AAGR
*Sample stock generally held on standard versions only. Contact factory for availability of nonstandard versions. _______________________________________________________________________________________ 9
SOT23, Low-Power P Supervisory Circuits with Battery Backup MAX6361-MAX6364
Pin Configurations (continued)
TOP VIEW
RESET, RESET 1
6
BATT
RESET, RESET 1
6
BATT
RESET, RESET 1
6
BATT
GND 2
MAX6362
5
OUT
GND 2
MAX6363
5
OUT
GND 2
MAX6364
5
OUT
WDI 3 SOT23-6
4
VCC
BATT ON 3 SOT23-6
4
VCC
RESET IN 3 SOT23-6
4
VCC
Typical Operating Circuit
TRANSISTOR COUNT: 720
UNREGULATED DC VOLTAGE R1 0.1F 2.4V TO 5.5V VCC VCC RESET RESET IN R2 GND RESET P
Chip Information
MAX6364
BUS OUT 3.6V Li+ BATTERY BATT GND 0.1F VCC SRAM GND
10
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SOT23, Low-Power P Supervisory Circuits with Battery Backup
Package Information
6LSOT.EPS
MAX6361-MAX6364
______________________________________________________________________________________
11
SOT23, Low-Power P Supervisory Circuits with Battery Backup MAX6361-MAX6364
NOTES
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.
12 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 (c) 2000 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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