MAXIM MAX6361

19-1615; Rev 4; 10/11
SOT23, Low-Power µP Supervisory Circuits
with Battery Backup
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 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
Ordering Information
Applications
PART
TEMP RANGE
PIN-PACKAGE
MAX6361LUT_ _-T
-40°C to +85°C
6 SOT23
MAX6361PUT_ _-T
-40°C to +85°C
6 SOT23
Computers
Fax Machines
Controllers
Industrial Control
MAX6361HUT_ _-T
-40°C to +85°C
6 SOT23
Intelligent Instruments
POS Equipment
MAX6362LUT_ _-T
-40°C to +85°C
6 SOT23
Critical µP/µC
Power Monitoring
Portable/Battery-Powered
Equipment
MAX6362PUT_ _-T
-40°C to +85°C
6 SOT23
MAX6362HUT_ _-T
-40°C to +85°C
6 SOT23
MAX6363LUT_ _-T
-40°C to +85°C
6 SOT23
MAX6363PUT_ _-T
-40°C to +85°C
6 SOT23
MAX6363HUT_ _-T
-40°C to +85°C
6 SOT23
MAX6364LUT_ _-T
-40°C to +85°C
6 SOT23
MAX6364PUT_ _-T
-40°C to +85°C
6 SOT23
Pin Configurations
TOP VIEW
RESET, RESET 1
GND 2
MAX6361
MR 3
6
BATT
5
OUT
4
VCC
MAX6364HUT_ _-T
-40°C to +85°C
6 SOT23
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).
Devices are available in both leaded and lead-free packaging.
Specify lead-free by replacing "-T" with "+T" when ordering.
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
Selector Guide appears at end of data sheet.
29
2.85
2.93
3.00
Typical Operating Circuit appears at end of data sheet.
26
2.55
2.63
2.70
23
2.25
2.32
2.38
SOT23-6
Pin Configurations continued at end of data sheet.
________________________________________________________________ Maxim Integrated Products
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.
1
MAX6361–MAX6364
General Description
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
Soldering Temperature (reflow)
Lead(Pb)-free...............................................................+260°C
Packages containing lead(Pb).....................................+240°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 = 0V
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
0.05
VCC = 4.75V, IOUT ≤ 150mA
2.75
VCC to OUT On-Resistance
RON
VCC = 3.15V, IOUT ≤ 65mA
3.0
VCC = 2.38V, IOUT ≤ 25mA
4.6
Supply Current
(Excluding IOUT)
ISUPPLY in Battery-Backup
Mode (Excluding IOUT)
ICC
VOUT in Battery-Backup Mode
Battery-Switchover Threshold
(VCC - VBATT)
Reset Threshold
2
VBATT - 0.2
VBATT - 0.15
VBATT = 2.25V, IOUT ≤ 5mA
VBATT - 0.15
VCC < VTH
VTH
VCC Falling Reset Delay
Reset-Active Timeout Period
VBATT = 4.5V, IOUT ≤ 20mA
VBATT = 3.0V, IOUT ≤ 10mA
Power-down
tRP
µA
Ω
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
µA
V
20
Power-up
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 = 0V
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
Pull-Up Resistance
20
Minimum Pulse Width
1
V
kΩ
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
0.7 VCC
VIH
s
ns
0.3 VCC
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 0V anytime or VCC can go down to 0V 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)
16
14
-20
0.6
VBATT = 2.0V
0.4
0.2
20
40
60
6
5
VBATT = 2.0V
4
VBATT = 2.8V
3
2
VBATT = 5.0V
1
IOUT = 25mA
VCC = 0V
0
-40
80
MAX6361 toc03
MAX6361 toc02
0.8
0
0
-20
0
20
40
60
80
-40
-20
0
80
RESET TIMEOUT PERIOD
vs. TEMPERATURE
VCC TO RESET PROPAGATION DELAY
vs. TEMPERATURE
MAX6361 toc04
VCC = 3.0V
IOUT = 65mA
0.6
VCC = 4.5V
IOUT = 150mA
0.3
210
135
205
200
195
VCC FALLING
120
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)
VBATT = 2.8V
PROPAGATION DELAY (µs)
-40
1.0
7
MAX6361 toc05
12
VBATT = 0V
VCC = 5.0V
VCC = 0
BATTERY TO OUT ON-RESISTANCE
vs. TEMPERATURE
BATT TO OUT ON-RESISTANCE (Ω)
18
1.2
BATTERY SUPPLY CURRENT (µA)
MAX6361 toc01
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,
R1 = R2
[(VRTH / VREF ) − 1]
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 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
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.
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).
Negative-Going VCC Transients
These supervisors are relatively immune to short-duration, 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.
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.
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
PART
TOP
MARK
PART
TOP
MARK
PART
TOP
MARK
PART
TOP
MARK
MAX6361LUT23
AAEI
MAX6362LUT23
AAFA
MAX6363LUT23
AAFS
MAX6364LUT23
AAGK
MAX6361LUT26
AAEH
MAX6362LUT26
AAEZ
MAX6363LUT26
AAFR
MAX6364LUT26
AAGJ
MAX6361LUT29*
AAEG
MAX6362LUT29*
AAEY
MAX6363LUT29*
AAFQ
MAX6364LUT29*
AAGI
MAX6361LUT31
AAEF
MAX6362LUT31
AAEX
MAX6363LUT31
AAFP
MAX6364LUT31
AAGH
MAX6361LUT44
AAEE
MAX6362LUT44
AAEW
MAX6363LUT44
AAFO
MAX6364LUT44
AAGG
MAX6361LUT46*
AAED
MAX6362LUT46*
AAEV
MAX6363LUT46*
AAFN
MAX6364LUT46*
AAGF
MAX6361PUT23
AAEO
MAX6362PUT23
AAFG
MAX6363PUT23
AAFY
MAX6364PUT23
AAGQ
MAX6361PUT26
AAEN
MAX6362PUT26
AAFF
MAX6363PUT26
AAFX
MAX6364PUT26
AAGP
MAX6361PUT29*
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
*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
MAX6364
6
BATT
5
OUT
4
VCC
SOT23-6
SOT23-6
Typical Operating Circuit
Chip Information
PROCESS: BiCMOS
UNREGULATED
DC VOLTAGE
2.4V TO 5.5V
VCC
R1
0.1µF
Package Information
VCC
RESET
RESET µP
RESET IN
GND
R2
MAX6364
BUS
OUT
3.6V Li+
BATTERY
BATT
VCC
GND
0.1µF
SRAM
GND
10
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
6 SOT23
PACKAGE
CODE
OUTLINE
NO.
LAND
PATTERN NO.
U6-1
21-0058
90-0175
______________________________________________________________________________________
SOT23, Low-Power µP Supervisory Circuits
with Battery Backup
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
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
Revision History