19-1615; Rev 2; 7/00 SOT23, Low-Power µP Supervisory Circuits 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) ♦ Watchdog Timer with 1.6s Timeout Period (MAX6362) ♦ Battery-On Output Indicator (MAX6363) ♦ Auxiliary User-Adjustable RESET IN (MAX6364) ♦ Three Available Output Structures Push-Pull RESET, Open-Drain RESET, Open-Drain 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 Ordering Information Applications Computers Fax Machines Controllers Industrial Control Intelligent Instruments Critical µP/µC Power Monitoring TEMP. RANGE PIN-PACKAGE -40°C to +85°C 6 SOT23-6 MAX6361PUT_ _-T -40°C to +85°C 6 SOT23-6 MAX6361HUT_ _-T -40°C to +85°C 6 SOT23-6 POS Equipment MAX6362LUT_ _-T -40°C to +85°C 6 SOT23-6 Portable/Battery-Powered Equipment MAX6362PUT_ _-T -40°C to +85°C 6 SOT23-6 MAX6362HUT_ _-T -40°C to +85°C 6 SOT23-6 MAX6363LUT_ _-T -40°C to +85°C 6 SOT23-6 MAX6363PUT_ _-T -40°C to +85°C 6 SOT23-6 MAX6363HUT_ _-T -40°C to +85°C 6 SOT23-6 MAX6364LUT_ _-T -40°C to +85°C 6 SOT23-6 MAX6364PUT_ _-T -40°C to +85°C 6 SOT23-6 MAX6364HUT_ _-T -40°C to +85°C 6 SOT23-6 Pin Configurations TOP VIEW RESET, RESET 1 GND 2 PART MAX6361LUT_ _-T MAX6361 MR 3 6 BATT 5 OUT 4 VCC 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. 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). SUFFIX RESET THRESHOLD RANGES (V) 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 ________________________________________________________________ Maxim Integrated Products 1 For free samples and the latest literature, visit www.maxim-ic.com or phone 1-800-998-8800. For small orders, phone 1-800-835-8769. MAX6361–MAX6364 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 (µP) systems. The circuits significantly improve system reliability and accuracy compared to that obtainable with separate ICs or discrete components. Their functions include µP 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). MAX6361–MAX6364 SOT23, Low-Power µP Supervisory Circuits with Battery Backup 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 = +70°C) 6-Pin SOT23 (derate 8.70mW/°C above +70°C) .........696mW Operating Temperature Range ...........................-40°C to +85°C Junction Temperature ......................................................+150°C Storage Temperature Range .............................-65°C to +150°C Lead Temperature (soldering, 10s) .................................+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 CHARACTERISTICS (VCC = +2.4V to +5.5V, VBATT = 3V, TA = -40°C to +85°C, reset not asserted. Typical values are at TA = +25°C, unless otherwise noted.) (Note 1) PARAMETER Operating Voltage Range, VCC or VBATT SYMBOL VCC, VBATT CONDITIONS MIN TYP 0 No load (Note 2) MAX UNITS 5.5 V No load, VCC > VTH, WDI = VCC or GND (MAX6362) VCC = 2.8V 10 30 VCC = 3.6V 11 35 VCC = 5.5V 15 50 ISUPPLY VBATT = 2.8V, VCC = 0 TA = +25°C 1 TA = -40°C to +85°C 3 BATT Standby Current IBATT 5.5V > VCC > (VBATT + 0.2V) TA = +25°C -0.1 0.02 TA = -40°C to +85°C -1.0 0.02 VCC = 4.75V, IOUT ≤ 150mA 2.75 VCC to OUT On-Resistance RON VCC = 3.15V, IOUT ≤ 65mA 3.0 Supply Current (Excluding IOUT) ISUPPLY in Battery-Backup Mode (Excluding IOUT) ICC VCC = 2.38V, IOUT ≤ 25mA VOUT in Battery-Backup Mode Battery-Switchover Threshold (VCC - VBATT) Reset Threshold VTH VCC Falling Reset Delay Reset-Active Timeout Period 2 VBATT - 0.2 VBATT = 3.0V, IOUT ≤ 10mA VBATT - 0.15 VBATT = 2.25V, IOUT ≤ 5mA VBATT - 0.15 µA Ω V 20 Power-up Power-down mV -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 MAX636_UT29 2.85 2.93 3.00 MAX636_UT26 2.55 2.63 2.70 MAX636_UT23 2.25 2.32 2.38 35 VCC falling at 10V/ms tRP µA 4.6 VBATT = 4.5V, IOUT ≤ 20mA VCC < VTH µA 150 _______________________________________________________________________________________ V µs 280 ms SOT23, Low-Power µP Supervisory Circuits with Battery Backup (VCC = +2.4V to +5.5V, VBATT = 3V, TA = -40°C to +85°C, reset not asserted. Typical values are at TA = +25°C, unless otherwise noted.) (Note 1) PARAMETER SYMBOL VOL RESET Output Voltage CONDITIONS Reset asserted, VBATT = 0 MIN TYP MAX UNITS ISINK = 1.6mA, VCC ≥ 2.1V 0.3 ISINK = 100µA, VCC ≥ 1.2V 0.4 V 0.3 V 1 µA VOH Reset not asserted (MAX636_L only) ISOURCE = 500µA, VCC ≥ VTH(MAX) RESET Output Voltage VOL Reset not asserted ISINK = 1.6mA, VCC ≥ VTH(MAX) RESET, RESET Output Leakage Current ILK MAX636_P, MAX636_H only 0.8 ✕ VCC MANUAL RESET (MAX6361 only) 0.3 ✕ VCC VIL MR Input Voltage 0.7 ✕ VCC VIH V Pull-Up Resistance 20 kΩ Minimum Pulse Width 1 µs Glitch Immunity VCC = 3.3V 100 ns MR to Reset Delay VCC = 3.3V 120 ns WATCHDOG INPUT (MAX6362 only) Watchdog Timeout Period tWD 1.00 Minimum WDI Input Pulse Width tWDI 100 1.60 0.3 ✕ VCC 0.7 ✕ VCC VIH s ns VIL Input Voltage 2.25 V BATT ON (MAX6363 only) Output Voltage VOL Output Short-Circuit Current 0.4 ISINK = 3.2mA, VBATT = 2.1V 60 Sink current, VCC = 5V Source current, VBATT ≥ 2V 10 V mA 30 100 1.235 1.285 V ±0.01 ±25 nA µA RESET IN (MAX6364 only) 1.185 Input Threshold RESET IN Leakage Current RESET IN to Reset Delay Overdrive voltage = 50mV, RESET IN falling 1.5 µs Note 1: All devices are 100% production tested at TA = +25°C. 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). _______________________________________________________________________________________ 3 MAX6361–MAX6364 ELECTRICAL CHARACTERISTICS (continued) Typical Operating Characteristics (TA = +25°C, unless otherwise noted.) SUPPLY CURRENT vs. TEMPERATURE (NO LOAD) 14 VBATT = 0 VCC = 5.0V -20 0.8 0.6 VBATT = 2.0V 0.4 0.2 20 40 60 80 MAX6361 toc03 MAX6361 toc02 VBATT = 2.8V 6 5 VBATT = 2.0V 4 VBATT = 2.8V 3 2 VBATT = 5.0V 1 IOUT = 25mA VCC = 0 0 0 0 -40 -20 0 20 40 60 -40 80 -20 0 80 RESET TIMEOUT PERIOD vs. TEMPERATURE VCC TO RESET PROPAGATION DELAY vs. TEMPERATURE 0.6 VCC = 4.5V IOUT = 150mA 0.3 135 205 200 195 VCC FALLING 120 PROPAGATION DELAY (µs) MAX6361 toc04 VCC = 3.0V IOUT = 65mA 210 0.25V/ms 105 90 75 60 45 1V/ms 30 15 0 20 40 60 80 10V/ms 0 190 -20 MAX6361 toc06 VCC TO OUT ON-RESISTANCE vs. TEMPERATURE 0 -40 -20 0 20 40 60 -40 80 -20 0 20 40 60 80 TEMPERATURE (°C) TEMPERATURE (°C) TEMPERATURE (°C) MAX6362 WATCHDOG TIMEOUT PERIOD vs. TEMPERATURE RESET THRESHOLD vs. TEMPERATURE MAXIMUM TRANSIENT DURATION vs. RESET THRESHOLD OVERDRIVE 4.5 THRESHOLD (V) 1.8 1.7 1.6 1.5 4.0 3.5 3.0 MAX636_26 1.4 2.5 1.3 2.0 1.2 -20 0 20 40 60 TEMPERATURE (°C) 80 400 MAX6361 toc08 MAX636_46 MAXIMUM TRANSIENT DURATION (µs) 1.9 MAX6361 toc07 5.0 MAX6361toc06a 2.0 4 60 TEMPERATURE (°C) 0.9 -40 40 TEMPERATURE (°C) VCC = 2.3V IOUT = 25mA -40 20 TEMPERATURE (°C) 1.2 VOUT TO OUT ON-RESISTANCE (Ω) 1.0 7 MAX6361 toc05 -40 VCC = 0 BATT TO OUT ON-RESISTANCE (Ω) 16 1.2 BATTERY SUPPLY CURRENT (µA) MAX6361 toc01 18 12 BATTERY TO OUT ON-RESISTANCE vs. TEMPERATURE BATTERY SUPPLY CURRENT (BACKUP MODE) vs. TEMPERATURE RESET TIMEOUT PERIOD (ms) SUPPLY CURRENT (µA) 20 WATCHDOG TIMEOUT PERIOD (s) MAX6361–MAX6364 SOT23, Low-Power µP Supervisory Circuits with Battery Backup 350 300 250 MAX636_46 200 RESET OCCURS ABOVE CURVE 150 100 50 MAX636_26 0 -40 -20 0 20 40 TEMPERATURE (°C) 60 80 1 10 100 1k 10k RESET THRESHOLD OVERDRIVE VTH - VCC (mV) _______________________________________________________________________________________ SOT23, Low-Power µP Supervisory Circuits with Battery Backup 6 5 VBATT = 2.5V 4 1.235 3 2 MAX6361 toc11 2.8 PROPAGATION DELAY (µs) VBATT = 2.8V 7 THRESHOLD (V) BATTERY SUPPLY CURRENT (µA) MAX6361 toc10 VTH = 2.93V 8 1.236 MAX6361 toc09 10 9 MAX6364 RESET IN TO RESET PROPAGATION DELAY vs. TEMPERATURE MAX6364 RESET IN THRESHOLD vs. TEMPERATURE BATTERY SUPPLY CURRENT vs. SUPPLY VOLTAGE VOD = 50mV 2.5 2.2 1.9 1.6 1.3 1 VBATT = 2.3V 0 0 1.234 1 2 3 VCC (V) 4 1.0 -40 -20 0 20 40 60 80 -40 TEMPERATURE (°C) -20 0 20 40 60 80 TEMPERATURE (°C) Pin Description PIN NAME FUNCTION RESET 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. RESET 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. 1 2 3 GND Ground MR 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. WDI 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. 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 asserted as long as RESET IN is low and for at least 150ms (tRP) after RESET IN goes high. 4 VCC 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. 5 OUT 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. 6 BATT 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 MAX6361–MAX6364 Typical Operating Characteristics (continued) (TA = +25°C, unless otherwise noted.) MAX6361–MAX6364 SOT23, Low-Power µP Supervisory Circuits with Battery Backup 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. 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. Manual Reset Input (MAX6361 Only) Many µP-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 20kΩ 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 0.1µF capacitor from MR to GND to provide additional noise immunity. Watchdog Input (MAX6362 Only) The watchdog monitors µP activity through the input WDI. If the µP becomes inactive, the reset output is asserted in pulses. To use the watchdog function, connect WDI to a bus line or µP I/O line. A change of state 6 (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 [(VRTH / VREF ) − 1] Since the input current at RESET IN is 25nA (max), large values (up to 1MΩ) 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 STATUS VCC Disconnected from OUT OUT Connected to BATT BATT Connected to OUT. Current drawn from the battery is less than 1µA (at VBATT = 2.8V, excluding IOUT) when VCC = 0. RESET/RESET Asserted BATT ON High state MR, RESET IN, WDI Inputs ignored _______________________________________________________________________________________ SOT23, Low-Power µP Supervisory Circuits with Battery Backup 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 30µs will not trigger a reset pulse. A 0.1µF bypass capacitor mounted close to the VCC pin provides additional transient immunity. Reset Output A µP’s reset input starts the µP in a known state. The MAX6361–MAX6364 µP 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 0.1µF 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 µP WDI tRP tWD tRP tWD RESET tWD = WATCHDOG TIMEOUT PERIOD tRP = RESET TIMEOUT PERIOD Figure 1. MAX6362 Watchdog Timeout Period and Reset Active Time _______________________________________________________________________________________ 7 MAX6361–MAX6364 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 = 100kΩ, and calculate R1 = 273kΩ. MAX6361–MAX6364 SOT23, Low-Power µP Supervisory Circuits with Battery Backup 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 _______________________________________________________________________________________ SOT23, Low-Power µP Supervisory Circuits with Battery Backup PART MANUAL RESET INPUT MR MAX6361LUT_ _ ✓ MAX6361PUT_ _ ✓ MAX6361HUT_ _ ✓ WATCHDOG INPUT WDI BATT ON RESET IN RESET PUSHPULL RESET OPEN DRAIN RESET OPEN DRAIN ✓ ✓ ✓ MAX6362LUT_ _ ✓ MAX6362PUT_ _ ✓ MAX6362HUT_ _ ✓ ✓ ✓ ✓ MAX6363LUT_ _ ✓ MAX6363PUT_ _ ✓ MAX6363HUT_ _ ✓ ✓ ✓ ✓ MAX6364LUT_ _ ✓ MAX6364PUT_ _ ✓ MAX6364HUT_ _ ✓ ✓ ✓ ✓ Device Marking Codes TOP MARK PART TOP MARK PART TOP MARK PART TOP MARK MAX6361LUT23 AAEI MAX6362LUT23 AAFA MAX6361LUT26 AAEH MAX6362LUT26 AAEZ MAX6363LUT23 AAFS MAX6364LUT23 AAGK MAX6363LUT26 AAFR MAX6364LUT26 AAGJ MAX6361LUT29* AAEG MAX6362LUT29* MAX6361LUT31 AAEF MAX6362LUT31 AAEY MAX6363LUT29* AAFQ MAX6364LUT29* AAGI AAEX MAX6363LUT31 AAFP MAX6364LUT31 AAGH MAX6361LUT44 AAEE MAX6362LUT44 MAX6361LUT46* AAED MAX6362LUT46* AAEW MAX6363LUT44 AAFO MAX6364LUT44 AAGG AAEV MAX6363LUT46* AAFN MAX6364LUT46* AAGF MAX6361PUT23 AAEO MAX6361PUT26 AAEN MAX6362PUT23 AAFG MAX6363PUT23 AAFY MAX6364PUT23 AAGQ MAX6362PUT26 AAFF MAX6363PUT26 AAFX MAX6364PUT26 MAX6361PUT29* AAGP AAEM MAX6362PUT29* AAFE MAX6363PUT29* AAFW MAX6364PUT29* AAGO MAX6361PUT31 AAEL MAX6362PUT31 AAFD MAX6363PUT31 AAFV MAX6364PUT31 AAGN MAX6361PUT44 AAEK MAX6362PUT44 AAFC MAX6363PUT44 AAFU MAX6364PUT44 AAGM MAX6361PUT46* AAEJ MAX6362PUT46* AAFB MAX6363PUT46* AAFT MAX6364PUT46* AAGL MAX6361HUT23 AAEU MAX6362HUT23 AAFM MAX6363HUT23 AAGE MAX6364HUT23 AAGW MAX6361HUT26 AAET MAX6362HUT26 AAFL MAX6363HUT26 AAGD MAX6364HUT26 AAGV MAX6361HUT29 AAES MAX6362HUT29 AAFK MAX6363HUT29 AAGC MAX6364HUT29 AAGU MAX6361HUT31 AAER MAX6362HUT31 AAFJ MAX6363HUT31 AAGB MAX6364HUT31 AAGT MAX6361HUT44 AAEQ MAX6362HUT44 AAFI MAX6363HUT44 AAGA MAX6364HUT44 AAGS MAX6361HUT46* AAEP MAX6362HUT46* AAFH MAX6363HUT46* AAFZ MAX6364HUT46* AAGR PART *Sample stock generally held on standard versions only. Contact factory for availability of nonstandard versions. _______________________________________________________________________________________ 9 MAX6361–MAX6364 Selector Guide MAX6361–MAX6364 SOT23, Low-Power µP Supervisory Circuits with Battery Backup Pin Configurations (continued) TOP VIEW RESET, RESET 1 GND 2 MAX6362 WDI 3 RESET, RESET 1 6 BATT 5 OUT GND 2 4 VCC BATT ON 3 SOT23-6 MAX6363 RESET, RESET 1 6 BATT 5 OUT GND 2 4 VCC RESET IN 3 SOT23-6 Typical Operating Circuit MAX6364 R1 2.4V TO 5.5V VCC RESET RESET µP RESET IN GND R2 MAX6364 BUS OUT 3.6V Li+ BATTERY BATT VCC GND 0.1µF SRAM GND 10 5 OUT 4 VCC Chip Information VCC 0.1µF BATT SOT23-6 TRANSISTOR COUNT: 720 UNREGULATED DC VOLTAGE 6 ______________________________________________________________________________________ SOT23, Low-Power µP Supervisory Circuits with Battery Backup 6LSOT.EPS ______________________________________________________________________________________ 11 MAX6361–MAX6364 Package Information MAX6361–MAX6364 SOT23, Low-Power µP Supervisory Circuits with Battery Backup 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 © 2000 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.