For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
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 open-drain reset, an
active-low open-drain reset, and an active-high open-
drain reset (see
Selector Guide
at end of data sheet).
Applications
Features
oLow +1.2V Operating Supply Voltage
(VCC or VBATT)
oPrecision Monitoring of +5.0V, +3.3V, +3.0V, and
+2.5V Power-Supply Voltages
oDebounced Manual Reset Input (MAX6361)
oWatchdog Timer with 1.6s Timeout Period
(MAX6362)
oBattery-On Output Indicator (MAX6363)
oAuxiliary User-Adjustable RESET IN (MAX6364)
oThree Available Output Structures
Push-Pull RESET, Open-Drain RESET,
Open-Drain RESET
oRESET/RESET Valid Down to 1.2V Guaranteed
(VCC or VBATT)
oPower-Supply Transient Immunity
o150ms (min) Reset Timeout Period
oSmall 6-Pin SOT23 Package
MAX6361–MAX6364
SOT23, Low-Power µP Supervisory Circuits
with Battery Backup
________________________________________________________________
Maxim Integrated Products
1
19-1615; Rev 4; 10/11
Ordering Information
Pin Configurations
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 2500-
piece minimum on the SOT package (tape-and-reel only).
Devices are available in both leaded and lead-free packaging.
Specify lead-free by replacing "-T" with "+T" when ordering.
GND
VCC
MR
16BATT
5OUT
RESET, RESET
MAX6361
TOP VIEW
2
34
SOT23-6
Computers
Controllers
Intelligent Instruments
Critical µP/µC
Power Monitoring
Fax Machines
Industrial Control
POS Equipment
Portable/Battery-Powered
Equipment
Selector Guide appears at end of data sheet.
Typical Operating Circuit appears at end of data sheet.
Pin Configurations continued at end of data sheet.
6 SOT23-40°C to +85°CMAX6364HUT_ _-T
6 SOT23-40°C to +85°CMAX6364PUT_ _-T
6 SOT23-40°C to +85°C
MAX6364LUT_ _-T
6 SOT23-40°C to +85°C
6 SOT23-40°C to +85°CMAX6363HUT_ _-T
MAX6363PUT_ _-T
6 SOT23-40°C to +85°C
6 SOT23-40°C to +85°C
MAX6363LUT_ _-T
6 SOT23
PIN-PACKAGETEMP RANGE
-40°C to +85°C
MAX6361HUT_ _-T
6 SOT23-40°C to +85°CMAX6361PUT_ _-T
MAX6361LUT_ _-T
PART
6 SOT23-40°C to +85°CMAX6362HUT_ _-T
6 SOT23-40°C to +85°CMAX6362PUT_ _-T
6 SOT23-40°C to +85°C
MAX6362LUT_ _-T
SUFFIX MIN
46 4.50 4.63
MAXTYP
44 4.25 4.38
31 3.00 3.08
4.75
4.50
3.15
23 2.25
29 2.85 2.93
2.32
26 2.55 2.63
2.38
3.00
2.70
RESET THRESHOLD RANGES (V)
MAX6361–MAX6364
SOT23, Low-Power µP Supervisory Circuits
with Battery Backup
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
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)
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.
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
Soldering Temperature (reflow)
Lead(Pb)-free...............................................................+260°C
Packages containing lead(Pb).....................................+240°C
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
V
0 5.5
No load (Note 2)
VCC,
VBATT
Operating Voltage Range,
VCC or VBATT
Supply Current
(Excluding IOUT)ICC
No load, VCC > VTH,
WDI = VCC or GND
(MAX6362)
VCC = 2.8V
VCC = 3.6V
VCC = 5.5V
10 30
11 35
15 50
µA
µA
1
3
TA= +25°C
TA= -40°C to +85°C
VBATT = 2.8V,
VCC = 0V
ISUPPLY
ISUPPLY in Battery-Backup
Mode (Excluding IOUT)
BATT Standby Current IBATT 5.5V > VCC >
(VBATT + 0.2V)
TA= +25°C
TA= -40°C to +85°C
-0.1 0.02
-1.0 0.05 µA
Ω
2.75
3.0
4.6
VCC = 4.75V, IOUT ≤150mA
VCC = 3.15V, IOUT ≤65mA
VCC = 2.38V, IOUT ≤25mA
RON
VCC to OUT On-Resistance
VOUT in Battery-Backup Mode
Battery-Switchover Threshold
(VCC - VBATT)
Reset Threshold
VCC Falling Reset Delay
Reset-Active Timeout Period tRP
VTH
VBATT = 4.5V, IOUT ≤20mA
VBATT = 3.0V, IOUT ≤10mA
VBATT = 2.25V, IOUT ≤5mA
VCC < VTH
MAX636_UT46
VCC falling at 10V/ms
VBATT - 0.2
VBATT - 0.15
VBATT - 0.15
20
-20
4.50 4.63 4.75
4.25 4.38 4.50
3.00 3.08 3.15
2.85 2.93 3.00
2.55 2.63 2.70
2.25 2.32 2.38
35
150 280 ms
µs
V
mV
V
Power-up
Power-down
MAX636_UT23
MAX636_UT26
MAX636_UT29
MAX636_UT31
MAX636_UT44
MAX6361–MAX6364
SOT23, Low-Power µP Supervisory Circuits
with Battery Backup
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS (continued)
(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)
Note 1: All devices are 100% production tested at TA= +25°C. Limits over temperature are guaranteed by design.
Note 2: VBATT can be 0V anytime or VCC can go down to 0V if VBATT is active (except at startup).
PARAMETER SYMBOL MIN TYP MAX UNITSCONDITIONS
Output Voltage VOL 0.4 V
Output Short-Circuit Current 60 mA
ISINK = 3.2mA, VBATT = 2.1V
Sink current, VCC = 5V
RESET Output Voltage VOL 0.3 V
MR Input Voltage 0.7 VCC
V
Pull-Up Resistance 20 kΩ
Minimum Pulse Width 1µs
Glitch Immunity 100 ns
MR to Reset Delay 120 ns
Reset not asserted
VCC = 3.3V
VCC = 3.3V
RESET Output Voltage
VOL
0.3
V
Reset asserted,
VBATT = 0V
Input Threshold 1.185 1.235 1.285 V
RESET IN Leakage Current ±0.01 ±25 nA
1.5 µsOverdrive voltage = 50mV, RESET IN fallingRESET IN to Reset Delay
10 30 100 µASource current, VBATT ≥2V
VIH
VIL 0.3 VCC
VOH 0.8 VCC
Reset not asserted
(MAX636_L only)
ISOURCE = 500µA,
VCC ≥VTH(MAX)
0.4
ISINK = 100µA,
VCC ≥1.2V
ISINK = 1.6mA,
VCC ≥2.1V
RESET, RESET Output Leakage
Current ILK 1µAMAX636_P, MAX636_H only
ISINK = 1.6mA,
VCC ≥VTH(MAX)
Minimum WDI Input Pulse Width tWDI 100 ns
Input Voltage VIL 0.3 VCC V
Watchdog Timeout Period tWD 1.00 1.60 2.25 s
MANUAL RESET (MAX6361 only)
BATT ON (MAX6363 only)
RESET IN (MAX6364 only)
WATCHDOG INPUT (MAX6362 only)
VIH 0.7 VCC
MAX6361–MAX6364
SOT23, Low-Power µP Supervisory Circuits
with Battery Backup
4 _______________________________________________________________________________________
Typical Operating Characteristics
(TA= +25°C, unless otherwise noted.)
12
14
16
18
20
SUPPLY CURRENT vs. TEMPERATURE
(NO LOAD)
MAX6361 toc01
TEMPERATURE (°C)
SUPPLY CURRENT (µA)
-40 20 40-20 0 60 80
VBATT = 0V
VCC = 5.0V
0
0.2
0.6
0.4
0.8
1.0
1.2
BATTERY SUPPLY CURRENT
(BACKUP MODE) vs. TEMPERATURE
MAX6361 toc02
TEMPERATURE (°C)
BATTERY SUPPLY CURRENT (µA)
-40 20 40-20 0 60 80
VBATT = 2.0V
VCC = 0
VBATT = 2.8V
0
1
4
3
2
5
6
7
BATTERY TO OUT ON-RESISTANCE
vs. TEMPERATURE
MAX6361 toc03
TEMPERATURE (°C)
BATT TO OUT ON-RESISTANCE (Ω)
-40 20 40-20 0 60 80
VBATT = 5.0V
IOUT = 25mA
VCC = 0V
VBATT = 2.8V
VBATT = 2.0V
0
0.3
0.9
0.6
1.2
VCC TO OUT ON-RESISTANCE
vs. TEMPERATURE
MAX6361 toc04
TEMPERATURE (°C)
VOUT TO OUT ON-RESISTANCE (Ω)
-40 20 40-20 0 60 80
VCC = 3.0V
IOUT = 65mA
VCC = 4.5V
IOUT = 150mA
VCC = 2.3V
IOUT = 25mA
190
195
205
200
210
RESET TIMEOUT PERIOD
vs. TEMPERATURE
MAX6361 toc05
TEMPERATURE (°C)
RESET TIMEOUT PERIOD (ms)
-40 20 40-20 0 60 80
0
30
15
75
60
45
135
120
105
90
VCC TO RESET PROPAGATION DELAY
vs. TEMPERATURE
MAX6361 toc06
TEMPERATURE (°C)
PROPAGATION DELAY (µs)
-40 20 40-20 0 60 80
VCC FALLING
0.25V/ms
1V/ms
10V/ms
2.0
3.0
2.5
5.0
4.5
4.0
3.5
RESET THRESHOLD
vs. TEMPERATURE
MAX6361 toc07
TEMPERATURE (°C)
THRESHOLD (V)
-40 20 40-20 0 60 80
MAX636_46
MAX636_26
1.2
1.4
1.3
1.6
1.5
1.9
1.8
1.7
2.0
-40 0-20 20406080
MAX6362
WATCHDOG TIMEOUT PERIOD
vs. TEMPERATURE
MAX6361toc06a
TEMPERATURE (°C)
WATCHDOG TIMEOUT PERIOD (s)
1 10010 1k 10k
MAXIMUM TRANSIENT DURATION
vs. RESET THRESHOLD OVERDRIVE
MAX6361 toc08
RESET THRESHOLD OVERDRIVE VTH - VCC (mV)
MAXIMUM TRANSIENT DURATION (µs)
400
300
350
250
200
0
50
150
100
MAX636_46
MAX636_26
RESET OCCURS
ABOVE CURVE
MAX6361–MAX6364
SOT23, Low-Power µP Supervisory Circuits
with Battery Backup
_______________________________________________________________________________________ 5
1.234
1.235
1.236
MAX6364
RESET IN THRESHOLD
vs. TEMPERATURE
MAX6361 toc10
TEMPERATURE (°C)
THRESHOLD (V)
-40 20 40-20 0 60 80
Typical Operating Characteristics (continued)
(TA= +25°C, unless otherwise noted.)
1.0
1.9
1.6
1.3
2.8
2.5
2.2
MAX6364
RESET IN TO RESET PROPAGATION DELAY
vs. TEMPERATURE
MAX6361 toc11
TEMPERATURE (°C)
PROPAGATION DELAY (µs)
-40 20 40-20 0 60 80
VOD = 50mV
Pin Description
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.
BATT6
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.
VCC
4
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.
OUT5
GroundGND2
PIN
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.
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
1
FUNCTIONNAME
0
3
2
1
4
5
6
7
8
9
10
01234
BATTERY SUPPLY CURRENT
vs. SUPPLY VOLTAGE
MAX6361 toc09
VCC (V)
BATTERY SUPPLY CURRENT (µA)
VBATT = 2.8V
VBATT = 2.5V
VTH = 2.93V
VBATT = 2.3V
MAX6361 Manual-Reset Input. Maintaining logic low on MR asserts a reset. Reset output remains assert-
ed for at least 150ms (tRP) after MR transitions from low to high. Leave unconnected or connected to VCC
if not used.
MR
3
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.
MAX6363 Battery-On Output. BATT ON goes high in battery backup mode.
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.
RESET IN
BATT ON
WDI
MAX6361–MAX6364
Detailed Description
The
Typical Operating Circuit
shows a typical connection
for the MAX6361–MAX6364 family. OUT powers the stat-
ic random-access memory (SRAM). OUT is internally
connected to VCC if VCC is greater than the reset thresh-
old, 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 bat-
tery installed at BATT, the MAX6361–MAX6364 auto-
matically 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 VBATT.
Table 1 lists the status of the inputs and outputs in bat-
tery-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 capabili-
ty, 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 20kΩpull-up resistor to
VCC. This input can be driven with TTL/CMOS logic lev-
els or with open-drain/collector outputs. Connect a nor-
mally 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, con-
nect WDI to a bus line or µP I/O line. A change of state
(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 sup-
ply. 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
):
where VREF = 1.235V. To simplify the resistor selection,
choose a value for R2 and calculate R1:
Since the input current at RESET IN is 25nA (max), large
values (up to 1MΩ) can be used for R2 with no signifi-
cant loss in accuracy. For example, in the
Typical
SOT23, Low-Power µP Supervisory Circuits
with Battery Backup
6 _______________________________________________________________________________________
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
VV
R
R
RTH REF
=+
⎛
⎝
⎜⎞
⎠
⎟
1
21
RRVV
RTH REF
12 1 / =
()
−
[]
MAX6361–MAX6364
SOT23, Low-Power µP Supervisory Circuits
with Battery Backup
_______________________________________________________________________________________ 7
Operating Circuit,
the MAX6362 monitors two supply
voltages. To monitor the secondary 5V logic or analog
supply with a 4.60V nominal programmed reset thresh-
old, choose R2 = 100kΩ, and calculate R1 = 273kΩ.
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 power-
up, 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 follow-
ing a watchdog timeout (Figure 1).
Applications Information
Operation Without a Backup
Power Source
The MAX6361–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 0.1µF 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-dura-
tion, negative-going VCC transients. Resetting the µP
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
WDI
tRP
tRP
tWD
tWD = WATCHDOG TIMEOUT PERIOD
tRP = RESET TIMEOUT PERIOD
tWD
Figure 1. MAX6362 Watchdog Timeout Period and Reset Active Time
MAX6361–MAX6364
Watchdog Software Considerations
(MAX6362 Only)
To help the watchdog timer monitor software execution
more closely, set and reset the watchdog input at dif-
ferent 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 contin-
ue 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, trigger-
ing a reset.
SOT23, Low-Power µP Supervisory Circuits
with Battery Backup
8 _______________________________________________________________________________________
START
SET
WDI
LOW
RETURN
END
SUBROUTINE
OR PROGRAM LOOP
SET WDI
HIGH
Figure 2. Watchdog Flow Diagram
MAX6361–MAX6364
SOT23, Low-Power µP Supervisory Circuits
with Battery Backup
_______________________________________________________________________________________ 9
AAGO
AAGU
AAGT
AAGS
AAGR
AAGV
AAGG
AAGF
AAGW
AAGQ
AAGN
AAGP
AAGH
AAGL
AAGI
TOP
MARK
AAGJ
AAGM
AAGK
MAX6364PUT29*
MAX6364HUT29
MAX6364HUT31
MAX6364HUT44
MAX6364HUT46*
MAX6364HUT26
MAX6364LUT44
MAX6364LUT46*
MAX6364HUT23
MAX6364PUT23
MAX6364PUT31
MAX6364PUT26
MAX6364LUT31
MAX6364PUT46*
MAX6364LUT29*
PART
MAX6364LUT26
MAX6364PUT44
MAX6364LUT23
AAFW
AAGC
AAGB
AAGA
AAFZ
AAGD
AAFO
AAFN
AAGE
AAFY
AAFV
AAFX
AAFP
AAFT
AAFQ
TOP
MARK
AAFR
AAFU
AAFS
MAX6363PUT29*
MAX6363HUT29
MAX6363HUT31
MAX6363HUT44
MAX6363HUT46*
MAX6363HUT26
MAX6363LUT44
MAX6363LUT46*
MAX6363HUT23
MAX6363PUT23
MAX6363PUT31
MAX6363PUT26
MAX6363LUT31
MAX6363PUT46*
MAX6363LUT29*
PART
MAX6363LUT26
MAX6363PUT44
MAX6363LUT23
MAX6362PUT29*
MAX6362HUT29
MAX6362HUT31
MAX6362HUT44
MAX6362HUT46*
MAX6362HUT26
MAX6362LUT44
MAX6362LUT46*
MAX6362HUT23
MAX6362PUT23
MAX6362PUT31
MAX6362PUT26
MAX6362LUT31
MAX6362PUT46*
MAX6362LUT29*
PART
MAX6362LUT26
MAX6362PUT44
MAX6362LUT23
MAX6361HUT29
MAX6361HUT31
MAX6361HUT44
MAX6361HUT46*
MAX6361HUT26
MAX6361HUT23
MAX6361PUT31
MAX6361PUT46*
MAX6361PUT44
MAX6361PUT29*
MAX6361LUT44
MAX6361LUT46*
MAX6361PUT23
MAX6361PUT26
MAX6361LUT31
MAX6361LUT29*
PART
MAX6361LUT26
MAX6361LUT23
AAFE
AAFK
AAFJ
AAFI
AAFH
AAFL
AAEW
AAEV
AAFM
AAFG
AAFD
AAFF
AAEX
AAFB
AAEY
TOP
MARK
AAEZ
AAFC
AAFA
AAES
AAER
AAEQ
AAEP
AAET
AAEU
AAEL
AAEJ
AAEK
AAEM
AAEE
AAED
AAEO
AAEN
AAEF
AAEG
TOP
MARK
AAEH
AAEI
*Sample stock generally held on standard versions only. Contact factory for availability of nonstandard versions.
Device Marking Codes
RESET
PUSH-
PULL
RESET
IN
RESET
OPEN
DRAIN
MAX6364PUT_ _
MAX6364HUT_ _
RESET
OPEN
DRAIN
MAX6363LUT_ _
MAX6363PUT_ _
MAX6363HUT_ _
MAX6364LUT_ _
MAX6361HUT_ _
PART BATT
ON
MANUAL
RESET
INPUT
MR
MAX6361PUT_ _
MAX6361LUT_ _
MAX6362LUT_ _
MAX6362PUT_ _
MAX6362HUT_ _
WATCHDOG
INPUT WDI
Selector Guide
MAX6361–MAX6364
SOT23, Low-Power µP Supervisory Circuits
with Battery Backup
10 ______________________________________________________________________________________
GND
VCC
BATT ON
16BATT
5OUT
RESET, RESET
MAX6363
TOP VIEW
2
34
GND
VCC
RESET IN
16BATT
5OUT
RESET, RESET
MAX6364
2
34
SOT23-6
SOT23-6
GND
VCC
WDI
16BATT
5OUT
RESET, RESET
MAX6362
2
34
SOT23-6
Pin Configurations (continued)
Typical Operating Circuit
BUS
RESET
OUT
GND
BATT
RESET IN
VCC
VCC
VCC
GND
µP
GND
SRAM
0.1µF
R2
R1
0.1µF
RESET
UNREGULATED
DC VOLTAGE
3.6V Li+
BATTERY
2.4V TO 5.5V
MAX6364
Chip Information
PROCESS: BiCMOS
Package Information
For the latest package outline information and land patterns
(footprints), go to www.maxim-ic.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.
6 SOT23 U6-1 21-0058 90-0175
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. 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.
11
____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600
© 2011 Maxim Integrated Products Maxim is a registered trademark of Maxim Integrated Products, Inc.
MAX6361–MAX6364
SOT23, Low-Power µP Supervisory Circuits
with Battery Backup
Revision History
REVISION
NUMBER
REVISION
DATE DESCRIPTION PAGES
CHANGED
0 1/00 Initial release —
3 11/05 Added lead-free information. 1
4 10/11 Updated Electrical Characteristics.2
