MAX6362LUT26+T [MAXIM]
Power Supply Support Circuit, Fixed, 2 Channel, BICMOS, PDSO6, SOT-23, 6 PIN;
| 型号： | MAX6362LUT26+T |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | Power Supply Support Circuit, Fixed, 2 Channel, BICMOS, PDSO6, SOT-23, 6 PIN 信息通信管理 光电二极管 |
| 文件： | 总11页 (文件大小：118K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
19-1615; Rev 4; 10/11
SOT23, Low-Power µP Supervisory Circuits
with Battery Backup
1–MAX364
General Description
Features
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.
o Low +1.2V Operating Supply Voltage
(V
or V
)
CC
BATT
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
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).
o RESET/RESET Valid Down to 1.2V Guaranteed
(V
CC
or V
)
BATT
o Power-Supply Transient Immunity
o 150ms (min) Reset Timeout Period
o Small 6-Pin SOT23 Package
Ordering Information
Applications
PART
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
6 SOT23
6 SOT23
6 SOT23
6 SOT23
6 SOT23
6 SOT23
6 SOT23
6 SOT23
6 SOT23
6 SOT23
6 SOT23
6 SOT23
MAX6361LUT_ _-T
MAX6361PUT_ _-T
MAX6361HUT_ _-T
MAX6362LUT_ _-T
MAX6362PUT_ _-T
MAX6362HUT_ _-T
MAX6363LUT_ _-T
MAX6363PUT_ _-T
MAX6363HUT_ _-T
MAX6364LUT_ _-T
MAX6364PUT_ _-T
MAX6364HUT_ _-T
Computers
Fax Machines
Controllers
Industrial Control
POS Equipment
Intelligent Instruments
Critical µP/µC
Power Monitoring
Portable/Battery-Powered
Equipment
Pin Configurations
TOP VIEW
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.
RESET, RESET
1
2
3
6
5
4
BATT
OUT
MAX6361
GND
MR
RESET THRESHOLD RANGES (V)
SUFFIX
V
CC
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
46
44
31
29
26
23
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.
________________________________________________________________ Maxim Integrated Products
1
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.
SOT23, Low-Power µP Supervisory Circuits
with Battery Backup
ABSOLUTE MAXIMUM RATINGS
Terminal Voltages (with respect to GND)
Output Current
V , BATT, OUT.......................................................-0.3V to +6V
CC
OUT................................Short-Circuit Protection for up to 10s
RESET (open drain), RESET (open drain)................-0.3V to +6V
RESET, RESET, BATT ON ..............................................20mA
Continuous Power Dissipation (T = +70°C)
A
BATT ON, RESET (push-pull), RESET IN,
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)
WDI.......................................................-0.3V to (V
MR .............................................................-0.3V to (V
Input Current
+ 0.3V)
+ 0.3V)
OUT
CC
V
V
Peak ............................................................................1A
Continuous ............................................................250mA
CC
CC
BATT Peak ....................................................................250mA
BATT Continuous ............................................................40mA
GND ................................................................................75mA
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
(V
= +2.4V to +5.5V, V
= 3V, T = -40°C to +85°C, reset not asserted. Typical values are at T = +25°C, unless otherwise
CC
BATT
A
A
1–MAX364
noted.) (Note 1)
PARAMETER
Operating Voltage Range,
or V
SYMBOL
CONDITIONS
No load (Note 2)
No load, V > V
MIN
TYP
MAX
UNITS
V
CC
,
0
5.5
V
V
CC
V
BATT
BATT
V
V
V
= 2.8V
= 3.6V
= 5.5V
10
11
15
30
35
CC
CC
CC
,
TH
CC
Supply Current
(Excluding I
I
WDI = V
or GND
µA
CC
CC
)
OUT
(MAX6362)
50
T
T
T
T
= +25°C
1
A
A
A
A
I
in Battery-Backup
V
= 2.8V,
BATT
SUPPLY
I
µA
µA
SUPPLY
Mode (Excluding I
)
V
CC
= 0V
OUT
= -40°C to +85°C
= +25°C
3
-0.1
-1.0
0.02
0.05
2.75
3.0
4.6
5.5V > V
(V
>
CC
BATT Standby Current
I
BATT
+ 0.2V)
BATT
= -40°C to +85°C
V
CC
V
CC
V
CC
= 4.75V, I
= 3.15V, I
= 2.38V, I
≤ 150mA
≤ 65mA
≤ 25mA
≤ 20mA
≤ 10mA
OUT
OUT
OUT
V
to OUT On-Resistance
R
ON
Ω
CC
V
= 4.5V, I
V
- 0.2
BATT
BATT
BATT
OUT
OUT
BATT
V
in Battery-Backup Mode
V
= 3.0V, I
V
- 0.15
- 0.15
V
OUT
BATT
BATT
V
V
= 2.25V, I
≤ 5mA
OUT
V
Power-up
Power-down
20
Battery-Switchover Threshold
(V - V
< V
mV
CC
TH
)
BATT
CC
-20
MAX636_UT46
MAX636_UT44
MAX636_UT31
MAX636_UT29
MAX636_UT26
MAX636_UT23
4.50
4.25
3.00
2.85
2.55
2.25
4.63
4.38
3.08
2.93
2.63
2.32
35
4.75
4.50
3.15
3.00
2.70
2.38
Reset Threshold
V
TH
V
V
CC
Falling Reset Delay
V
CC
falling at 10V/ms
µs
Reset-Active Timeout Period
t
RP
150
280
ms
2
_______________________________________________________________________________________
SOT23, Low-Power µP Supervisory Circuits
with Battery Backup
1–MAX364
ELECTRICAL CHARACTERISTICS (continued)
(V
= +2.4V to +5.5V, V
= 3V, T = -40°C to +85°C, reset not asserted. Typical values are at T = +25°C, unless otherwise
CC
BATT
A
A
noted.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
I
V
= 1.6mA,
≥ 2.1V
SINK
CC
0.3
Reset asserted,
= 0V
V
OL
V
BATT
I
V
= 100µA,
≥ 1.2V
SINK
CC
0.4
V
RESET Output Voltage
Reset not asserted
(MAX636_L only)
I
V
= 500µA,
≥ V
TH(MAX)
SOURCE
CC
V
OH
0.8 ꢀ V
CC
I
V
= 1.6mA,
SINK
CC
RESET Output Voltage
V
Reset not asserted
0.3
1
V
OL
≥ V
TH(MAX)
RESET, RESET Output Leakage
Current
I
LK
MAX636_P, MAX636_H only
µA
MANUAL RESET (MAX6361 only)
V
0.3 ꢀ V
CC
IL
V
MR Input Voltage
V
IH
0.7 ꢀ V
CC
Pull-Up Resistance
20
1
kΩ
µs
ns
ns
Minimum Pulse Width
Glitch Immunity
V
V
= 3.3V
= 3.3V
100
120
CC
MR to Reset Delay
CC
WATCHDOG INPUT (MAX6362 only)
Watchdog Timeout Period
t
1.00
100
1.60
2.25
s
WD
Minimum WDI Input Pulse Width
t
ns
WDI
V
0.3 ꢀ V
IL
CC
Input Voltage
V
V
IH
0.7 ꢀ V
CC
BATT ON (MAX6363 only)
Output Voltage
V
OL
I
= 3.2mA, V = 2.1V
BATT
0.4
V
SINK
Sink current, V
= 5V
60
30
mA
µA
CC
Output Short-Circuit Current
Source current, V
≥ 2V
10
1.185
100
BATT
RESET IN (MAX6364 only)
Input Threshold
1.235 1.285
V
RESET IN Leakage Current
RESET IN to Reset Delay
0.01
1.5
25
nA
µs
Overdrive voltage = 50mV, RESET IN falling
Note 1: All devices are 100% production tested at T = +25°C. Limits over temperature are guaranteed by design.
A
Note 2: V
can be 0V anytime or V
can go down to 0V if V
is active (except at startup).
BATT
CC
BATT
_______________________________________________________________________________________
3
SOT23, Low-Power µP Supervisory Circuits
with Battery Backup
Typical Operating Characteristics
(T = +25°C, unless otherwise noted.)
A
SUPPLY CURRENT vs. TEMPERATURE
BATTERY SUPPLY CURRENT
(BACKUP MODE) vs. TEMPERATURE
BATTERY TO OUT ON-RESISTANCE
vs. TEMPERATURE
(NO LOAD)
1.2
1.0
0.8
0.6
0.4
0.2
0
7
6
5
4
3
2
1
0
20
V
= 0
CC
V
= 2.8V
BATT
18
16
14
V
= 2.0V
BATT
V
= 2.8V
BATT
V
= 2.0V
BATT
V
= 5.0V
20
BATT
0
I
= 25mA
= 0V
OUT
V
V
= 0V
= 5.0V
BATT
CC
V
CC
12
-40 -20
0
20
40
60
80
-40 -20
40
60
80
-40 -20
0
20
40
60
80
TEMPERATURE (°C)
TEMPERATURE (°C)
TEMPERATURE (°C)
1–MAX364
V
CC
TO OUT ON-RESISTANCE
vs. TEMPERATURE
V
CC
TO RESET PROPAGATION DELAY
vs. TEMPERATURE
RESET TIMEOUT PERIOD
vs. TEMPERATURE
1.2
0.9
0.6
0.3
0
210
205
200
195
190
135
V
I
= 2.3V
= 25mA
CC
OUT
V
FALLING
CC
120
105
90
75
60
45
30
15
0
0.25V/ms
V
= 3.0V
= 65mA
CC
I
OUT
V
= 4.5V
= 150mA
CC
I
OUT
1V/ms
10V/ms
20
-40 -20
0
20
40
60
80
-40 -20
0
40
60
80
-40 -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
5.0
4.5
4.0
3.5
3.0
2.5
2.0
400
350
300
250
200
150
100
50
2.0
1.9
1.8
1.7
1.6
1.5
1.4
1.3
1.2
MAX636_46
MAX636_46
RESET OCCURS
ABOVE CURVE
MAX636_26
MAX636_26
0
-40 -20
0
20
40
60
80
1
10
100
1k
10k
-40 -20
0
20
40
60
80
TEMPERATURE (°C)
RESET THRESHOLD OVERDRIVE V - V (mV)
TEMPERATURE (°C)
TH CC
4
_______________________________________________________________________________________
SOT23, Low-Power µP Supervisory Circuits
with Battery Backup
1–MAX364
Typical Operating Characteristics (continued)
(T = +25°C, unless otherwise noted.)
A
MAX6364
MAX6364
RESET IN THRESHOLD
vs. TEMPERATURE
BATTERY SUPPLY CURRENT
vs. SUPPLY VOLTAGE
RESET IN TO RESET PROPAGATION DELAY
vs. TEMPERATURE
10
9
8
7
6
5
4
3
2
1
0
1.236
1.235
1.234
V
= 50mV
OD
2.8
2.5
2.2
1.9
1.6
1.3
1.0
V
= 2.93V
TH
V
= 2.8V
BATT
V
= 2.5V
BATT
V
= 2.3V
BATT
1
0
2
3
4
-40 -20
0
20
40
60
80
-40 -20
0
20
40
60
80
V
(V)
TEMPERATURE (°C)
TEMPERATURE (°C)
CC
Pin Description
PIN
NAME
FUNCTION
Active-High Reset Output. RESET is continuously high when V
is below the reset threshold (V ), MR is
CC
TH
low, or RESET IN is low. It asserts in pulses when the internal watchdog times out. RESET remains high
for the reset timeout period (t ) after V rises above the reset threshold, after the manual reset input
RESET
RP
CC
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.
1
2
3
Active-Low Reset Output. RESET is continuously low when V
is below the reset threshold (V ), MR is
TH
CC
low, or RESET IN is low. It asserts in pulses when the internal watchdog times out. RESET remains low for
the reset timeout period (t ) after V rises above the reset threshold, after the manual reset input goes
RESET
RP
CC
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.
GND
Ground
MAX6361 Manual-Reset Input. Maintaining logic low on MR asserts a reset. Reset output remains assert-
MR
ed for at least 150ms (t ) after MR transitions from low to high. Leave unconnected or connected to V
RP
CC
if not used.
MAX6362 Watchdog Input. If WDI remains high or low for longer than the watchdog timeout period (t ), the
WD
WDI
internal watchdog timer runs out and a reset pulse is triggered for the reset timeout period (t ) (Figure 1). The
RP
internal watchdog clears whenever reset asserts or whenever WDI sees a rising or falling edge.
BATT ON
RESET IN
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 (t ) after RESET IN goes high.
RP
Supply Voltage, 0 to 5.5V. Reset is asserted when V
drops below the reset threshold voltage (V ).
TH
CC
4
5
V
CC
Reset remains asserted until V
rises above V and for at least 150ms after V
rises above V
.
TH
CC
TH
CC
Output. OUT sources from V
when it is above the reset threshold (V ), and from the greater of V
or
CC
CC
TH
OUT
BATT when V
is below V .
TH
CC
Backup-Battery Input. When V
falls below the reset threshold, BATT switches to OUT if V
is 20mV
CC
BATT
6
BATT
greater than V . When V
rises 20mV above V , V
BATT CC
switches to OUT. The 40mV hysteresis
CC
CC
prevents repeated switching if V
falls slowly.
CC
_______________________________________________________________________________________
5
SOT23, Low-Power µP Supervisory Circuits
with Battery Backup
(high to low or low to high) within the watchdog timeout
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
period (t ) with a 100ns minimum pulse width clears
WD
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
connected to V
if V
is greater than the reset thresh-
CC
CC
timeout period (t ). The internal watchdog timer clears
RP
old, or to the greater of V
or V
when V
is less
CC
BATT
CC
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
than the reset threshold. OUT can supply up to 150mA
from V . When V is higher than V , the BATT ON
CC
CC
BATT
is lower than V
(MAX6363) output is low. When V
,
CC
BATT
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.
(t ) (Figure 1).
WD
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.
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-
1–MAX364
To program the reset threshold (V
) of the secondary
RTH
matically switch the RAM to backup power when V
CC
power supply, use the following equation (see Typical
Operating Circuit):
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:
⎛
⎜
⎞
⎠
R1
⎝ R2
V
= V
+ 1
⎟
RTH
REF
1) V
2) V
must be below the reset threshold.
CC
CC
must be below V
.
BATT
where V
= 1.235V. To simplify the resistor selection,
REF
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
R1 = R2
V
/V
−1
(
[
)
]
RTH REF
from V
at startup.
CC
choose a value for R2 and calculate R1:
Manual Reset Input (MAX6361 Only)
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
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 (t ) after it
RP
returns high. MR has an internal 20kΩ pull-up resistor to
Table 1. Input and Output Status in
Battery-Backup Mode
V
CC
. 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.
PIN
STATUS
V
CC
Disconnected from OUT
OUT
Connected to BATT
Connected to OUT. Current drawn from
BATT
the battery is less than 1µA (at V
=
BATT
= 0.
2.8V, excluding I
) when V
OUT
CC
Asserted
RESET/RESET
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
BATT ON
High state
MR, RESET IN,
Inputs ignored
WDI
6
_______________________________________________________________________________________
SOT23, Low-Power µP Supervisory Circuits
with Battery Backup
1–MAX364
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.
Replacing the Backup Battery
If BATT is decoupled with a 0.1µF capacitor to ground,
the backup power source can be removed while V
CC
remains valid without danger of triggering a reset pulse.
The device does not enter battery-backup mode when
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
V
CC
stays above the reset threshold voltage.
Negative-Going V
CC
Transients
These supervisors are relatively immune to short-dura-
tion, negative-going V transients. Resetting the µP
CC
when V
experiences only small glitches is usually
CC
not desirable.
RESET asserts when V
is below the reset threshold
RP
CC
The Typical Operating Characteristics section shows a
graph of Maximum Transient Duration vs. Reset
Threshold Overdrive for which reset is not asserted.
and for at least 150ms (t ) after V
rises above the
CC
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).
The graph was produced using negative-going V
CC
pulses, starting at V
and ending below the reset
CC
threshold by the magnitude indicated (reset threshold
overdrive). The graph shows the maximum pulse width
that a negative-going V
transient can typically have
CC
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
Applications Information
Operation Without a Backup
Power Source
decreases. Typically, a V
transient that goes 100mV
CC
below the reset threshold and lasts for 30µs will not
trigger a reset pulse.
The MAX6361–MAX6364 were designed for battery-
backed applications. If a backup battery is not used,
connect V
to OUT and connect BATT to GND.
CC
A 0.1µF bypass capacitor mounted close to the V
pin provides additional transient immunity.
CC
WDI
t
RP
t
RP
t
t
WD
WD
RESET
t = WATCHDOG TIMEOUT PERIOD
WD
t = RESET TIMEOUT PERIOD
RP
Figure 1. MAX6362 Watchdog Timeout Period and Reset Active Time
_______________________________________________________________________________________
7
SOT23, Low-Power µP Supervisory Circuits
with Battery Backup
Watchdog Software Considerations
(MAX6362 Only)
To help the watchdog timer monitor software execution
START
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-
SET
WDI
LOW
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
SUBROUTINE
OR PROGRAM LOOP
should “hang” in any subroutine, the problem would
SET WDI
HIGH
quickly be corrected, since the I/O is continually set low
and the watchdog timer is allowed to time out, trigger-
ing a reset.
1–MAX364
RETURN
END
Figure 2. Watchdog Flow Diagram
8
_______________________________________________________________________________________
SOT23, Low-Power µP Supervisory Circuits
with Battery Backup
1–MAX364
Selector Guide
MANUAL
RESET
OPEN
DRAIN
RESET
PUSH-
PULL
RESET
OPEN
DRAIN
RESET
INPUT
MR
WATCHDOG
INPUT WDI
BATT
ON
RESET
IN
PART
MAX6361LUT_ _
MAX6361PUT_ _
MAX6361HUT_ _
MAX6362LUT_ _
MAX6362PUT_ _
MAX6362HUT_ _
MAX6363LUT_ _
MAX6363PUT_ _
MAX6363HUT_ _
MAX6364LUT_ _
MAX6364PUT_ _
MAX6364HUT_ _
ꢁ
ꢁ
ꢁ
ꢁ
ꢁ
ꢁ
ꢁ
ꢁ
ꢁ
ꢁ
ꢁ
ꢁ
ꢁ
ꢁ
ꢁ
ꢁ
ꢁ
ꢁ
ꢁ
ꢁ
ꢁ
ꢁ
ꢁ
ꢁ
Device Marking Codes
TOP
MARK
TOP
MARK
TOP
MARK
TOP
MARK
PART
PART
PART
PART
MAX6361LUT23
MAX6361LUT26
MAX6361LUT29*
MAX6361LUT31
MAX6361LUT44
MAX6361LUT46*
MAX6361PUT23
MAX6361PUT26
MAX6361PUT29*
MAX6361PUT31
MAX6361PUT44
MAX6361PUT46*
MAX6361HUT23
MAX6361HUT26
MAX6361HUT29
MAX6361HUT31
MAX6361HUT44
MAX6361HUT46*
AAEI
AAEH
AAEG
AAEF
AAEE
AAED
AAEO
AAEN
AAEM
AAEL
AAEK
AAEJ
AAEU
AAET
AAES
AAER
AAEQ
AAEP
MAX6362LUT23
MAX6362LUT26
MAX6362LUT29*
MAX6362LUT31
MAX6362LUT44
MAX6362LUT46*
MAX6362PUT23
MAX6362PUT26
MAX6362PUT29*
MAX6362PUT31
MAX6362PUT44
MAX6362PUT46*
MAX6362HUT23
MAX6362HUT26
MAX6362HUT29
MAX6362HUT31
MAX6362HUT44
MAX6362HUT46*
AAFA
AAEZ
AAEY
AAEX
AAEW
AAEV
AAFG
AAFF
AAFE
AAFD
AAFC
AAFB
AAFM
AAFL
AAFK
AAFJ
AAFI
MAX6363LUT23
MAX6363LUT26
MAX6363LUT29*
MAX6363LUT31
MAX6363LUT44
MAX6363LUT46*
MAX6363PUT23
MAX6363PUT26
MAX6363PUT29*
MAX6363PUT31
MAX6363PUT44
MAX6363PUT46*
MAX6363HUT23
MAX6363HUT26
MAX6363HUT29
MAX6363HUT31
MAX6363HUT44
MAX6363HUT46*
AAFS
AAFR
AAFQ
AAFP
AAFO
AAFN
AAFY
AAFX
AAFW
AAFV
AAFU
AAFT
AAGE
AAGD
AAGC
AAGB
AAGA
AAFZ
MAX6364LUT23
MAX6364LUT26
MAX6364LUT29*
MAX6364LUT31
MAX6364LUT44
MAX6364LUT46*
MAX6364PUT23
MAX6364PUT26
MAX6364PUT29*
MAX6364PUT31
MAX6364PUT44
MAX6364PUT46*
MAX6364HUT23
MAX6364HUT26
MAX6364HUT29
MAX6364HUT31
MAX6364HUT44
MAX6364HUT46*
AAGK
AAGJ
AAGI
AAGH
AAGG
AAGF
AAGQ
AAGP
AAGO
AAGN
AAGM
AAGL
AAGW
AAGV
AAGU
AAGT
AAGS
AAGR
AAFH
*Sample stock generally held on standard versions only. Contact factory for availability of nonstandard versions.
_______________________________________________________________________________________
9
SOT23, Low-Power µP Supervisory Circuits
with Battery Backup
Pin Configurations (continued)
TOP VIEW
RESET, RESET
GND
1
2
3
6
5
4
BATT
OUT
RESET, RESET
GND
1
2
3
6
5
4
BATT
OUT
RESET, RESET
GND
1
2
3
6
5
4
BATT
OUT
MAX6363
MAX6364
MAX6362
BATT ON
V
CC
RESET IN
V
WDI
V
CC
CC
SOT23-6
SOT23-6
SOT23-6
1–MAX364
Typical Operating Circuit
Chip Information
PROCESS: BiCMOS
2.4V TO 5.5V
UNREGULATED
DC VOLTAGE
V
CC
0.1µF
V
CC
R1
Package Information
RESET
OUT
RESET
µP
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.
RESET IN
GND
R2
MAX6364
PACKAGE
TYPE
6 SOT23
PACKAGE
CODE
OUTLINE
NO.
LAND
BATT
V
CC
3.6V Li+
BATTERY
PATTERN NO.
SRAM
GND
GND
0.1µF
U6-1
21-0058
90-0175
10 ______________________________________________________________________________________
SOT23, Low-Power µP Supervisory Circuits
with Battery Backup
1–MAX364
Revision History
REVISION
NUMBER
REVISION
DATE
PAGES
DESCRIPTION
CHANGED
0
3
4
1/00
11/05
10/11
Initial release
—
Added lead-free information.
1
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.
相关型号：
MAX6362LUT29+
Power Supply Support Circuit, Adjustable, 1 Channel, BICMOS, PDSO6, ROHS COMPLIANT, SOT-23, 6 PIN
MAXIM
©2020 ICPDF网 联系我们和版权申明