MAX6825SUK+T [MAXIM]
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| 型号： | MAX6825SUK+T |
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MAXIM INTEGRATED PRODUCTS |
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MAX6821/MAX6825
Low-Voltage SOT23 µP Supervisors
with Manual Reset and Watchdog Timer
General Description
Features
The MAX6821–MAX6825 are low-voltage microproces-
sor (µP) supervisory circuits that combine voltage mon-
itoring, watchdog timer, and manual reset input func-
tions in a 5-pin SOT23 package. Microprocessor super-
visory circuits significantly improve system reliability and
accuracy compared to separate ICs or discrete compo-
nents. These devices assert a reset signal whenever the
monitored voltage drops below its preset threshold, keep-
● Monitors +1.8V, +2.5V, +3.0V, +3.3V, +5.0V Supplies
● 140ms (min) Reset Timeout Delay
● 1.6s Watchdog Timeout Period (MAX6821/MAX6822/
MAX6823/MAX6824)
● Manual Reset Input (MAX6821/MAX6822/MAX6823/
MAX6825)
● Three Reset Output Options
Push-Pull RESET
ing it asserted for a minimum timeout period after V rises
CC
Push-Pull RESET
Open-Drain RESET
above the threshold. In addition, a watchdog timer monitors
against code execution errors. A debounced manual reset
is also available. The MAX6821–MAX6825 monitor voltag-
es from +1.8V to +5.0V. These outputs are guaranteed to
● Guaranteed Reset Valid to V
= +1.0V
CC
● Immune to Short Negative V
● No External Components
Transients
CC
be in the correct state for V
down to +1.0V.
CC
Nine preprogrammed reset threshold voltages are
available (see the Threshold Suffix Guide). The
MAX6821, MAX6822, and MAX6823 all have a manual
reset input and a watchdog timer. The MAX6821 has
push-pull RESET, the MAX6822 has open-drain RESET,
and the MAX6823 has push-pull RESET. The MAX6824
has a watchdog timer and both push-pull RESET and
push-pull RESET. The MAX6825 has a manual reset
input and both push-pull RESET and push-pull RESET.
The Selector Guide explains the functions offered in
this series of parts.
● Small 5-Pin SOT23 Packages
Ordering Information
PART*
TEMP RANGE
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
PIN-PACKAGE
MAX6821_UK-T
MAX6822_UK-T
MAX6823_UK-T
MAX6824_UK-T
MAX6825_UK-T
5 SOT23-5
5 SOT23-5
5 SOT23-5
5 SOT23-5
5 SOT23-5
*Insert the desired suffix letter (from the table below) into the
blank to complete the part number
Devices are available in both leaded and lead(Pb)-free packag-
ing.Specify lead-free by replacing “-T” with “+T” when ordering.
Applications
● Set-Top Boxes
● Computers and Con-
trollers
● Intelligent Instruments
● Critical µP Monitoring
● Portable/Battery-
Threshold Suffix Guide
RESET
THRESHOLD (V)
● Embedded Controllers
Powered Equipment
SUFFIX
L
M
T
4.63
4.38
3.08
2.93
2.63
2.32
2.19
1.67
1.58
Pin Configurations
TOP VIEW
S
R
Z
RESET(RESET)
1
2
3
5
4
V
CC
MAX6821
MAX6822
MAX6823
GND
Y
W
V
MR
WDI
Note: Bold indicates standard versions. Samples are typically
available for standard versions only. All parts require a 2.5k
minimum order increment. Contact factory for availability.
SOT23-5
(RESET) MAX6821 ONLY
Pin Configurations continued at end of data sheet.
Typical Operating Circuit appears at end of data sheet.
Selector Guide appears at end of data sheet.
19-1868; Rev 3; 7/14
MAX6821/MAX6825
Low-Voltage SOT23 µP Supervisors
with Manual Reset and Watchdog Timer
Absolute Maximum Ratings
CC
V
to GND .........................................................-0.3V to +6.0V
Operating Temperature Range......................... -40°C to +125°C
Junction Temperature......................................................+150°C
Storage Temperature Range............................ -65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
Open-Drain RESET..............................................-0.3V to +6.0V
Push-Pull RESET, RESET, MR, WDI....... -0.3V to (V
+ 0.3V)
CC
Input Current (V )............................................................20mA
CC
Output Current (RESET, RESET)......................................20mA
Continuous Power Dissipation (T = +70°C)
A
5-Pin SOT23 (derate 7.1mW/°C above +70°C) ..........571mW
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
CC
(V
= +4.5V to +5.5V for MAX682_L/M, V
= +2.7V to +3.6V for MAX682_T/S/R, V
= +2.1V to +2.75V for MAX682_Z/Y, V
=
CC
CC
CC
+1.53V to +2.0V for MAX682_W/V, T = -40°C to +125°C, unless otherwise specified. Typical values are at T = +25°C.) (Note 1)
A
A
PARAMETER
SYMBOL
CONDITIONS
= 0°C to +85°C
MIN
1.0
TYP
MAX
5.5
5.5
20
UNITS
T
T
A
Operating Voltage Range
V
V
CC
= -40°C to +125°C
1.2
A
T
T
T
T
T
T
= -40°C to +85°C
= -40°C to +125°C
= -40°C to +85°C
= -40°C to +125°C
= -40°C to +85°C
= -40°C to +125°C
10
7
A
A
A
A
A
A
V
= +5.5V, no load
CC
30
16
25
12
20
V
Supply Current
(MR and WDI Unconnected)
CC
I
V
V
= +3.6V, no load
= +3.6V, no load
µA
CC
CC
5
CC
(MAX6825 only)
TA = -40°C to +85°C
4.50
4.63
4.75
MAX682_L
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
= -40°C to +125°C
= -40°C to +85°C
= -40°C to +125°C
= -40°C to +85°C
= -40°C to +125°C
= -40°C to +85°C
= -40°C to +125°C
= -40°C to +85°C
= -40°C to +125°C
= -40°C to +85°C
= -40°C to +125°C
= -40°C to +85°C
= -40°C to +125°C
= -40°C to +85°C
= -40°C to +125°C
= -40°C to +85°C
4.47
4.63
4.78
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
4.25
4.22
3.00
2.97
2.85
2.83
2.55
2.53
2.25
2.24
2.12
2.11
1.62
1.61
1.52
4.38
4.38
3.08
3.08
2.93
2.93
2.63
2.63
2.32
2.32
2.19
2.19
1.67
1.67
1.58
4.50
4.53
3.15
3.17
3.00
3.02
2.70
2.72
2.38
2.40
2.25
2.27
1.71
1.72
1.62
MAX682_M
MAX682_T
MAX682_S
MAX682_R
MAX682_Z
MAX682_Y
V
CC Reset Threshold
V
VTH
V
( CC Falling)
MAX682_W
MAX682_V
Reset Threshold Temperature
Coefficient
60
ppm/°C
Reset Threshold Hysteresis
2 × V
20
mV
µs
TH
V
to Reset Output Delay
t
V
= V to (V - 100mV)
CC
RD
CC TH TH
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MAX6821/MAX6825
Low-Voltage SOT23 µP Supervisors
with Manual Reset and Watchdog Timer
Electrical Characteristics (continued)
(V
= +4.5V to +5.5V for MAX682_L/M, V
= +2.7V to +3.6V for MAX682_T/S/R, V
= +2.1V to +2.75V for MAX682_Z/Y, V
=
CC
CC
CC
CC
+1.53V to +2.0V for MAX682_W/V, T = -40°C to +125°C, unless otherwise specified. Typical values are at T = +25°C.) (Note 1)
A
A
PARAMETER
SYMBOL
CONDITIONS
TA = -40°C to +85°C
= -40°C to +125°C
MIN
TYP
200
MAX
UNITS
140
280
Reset Timeout Period
tRP
ms
V
T
100
320
A
V
CC ≥ 1.0V, ISINK = 50µA, reset asserted,
TA = 0°C to +85°C
0.3
RESET Output LOW
(Push-Pull or Open-Drain)
V
V
V
V
1.2V, I
= 100µA, reset asserted
0.3
0.3
0.4
CC ≥
CC ≥
CC ≥
SINK
VOL
2.55V, I
= 1.2mA, reset asserted
= 3.2mA, reset asserted
SINK
SINK
4.25V, I
1.8V, I
= 200µA, reset not
CC ≥
SOURCE
0.8 × V
0.8 × V
0.8 × V
CC
CC
CC
asserted
RESET Output HIGH
V
3.15V, I
= 500µA, reset not
= 800µA, reset not
CC ≥
asserted
SOURCE
SOURCE
V
V
OH
(Push-Pull Only)
V
4.75V, I
CC ≥
asserted
Open-Drain RESET Output
I
V
V
> V , RESET not asserted
TH
1.0
µA
V
LKG
CC
Leakage Current (Note 1)
1.0V, I
°
= 1µA, reset asserted,
CC ≥
SOURCE
°
0.8 × V
CC
T
= 0 C to +85 C
A
RESET Output HIGH
(Push-Pull Only)
V
V
CC ≥
V
CC ≥
V
CC ≥
V
CC ≥
V
CC ≥
V
CC ≥
1.50V, I
2.55V, I
4.25V, I
= 100µA, reset asserted 0.8 × V
= 500µA, reset asserted 0.8 × V
= 800µA, reset asserted 0.8 × V
OH
OL
SOURCE
SOURCE
SOURCE
CC
CC
CC
1.8V, I
= 500µA, reset not asserted
0.3
0.3
0.4
SINK
RESET Output LOW
(Push-Pull Only)
V
3.15V, I
4.75V, I
= 1.2mA, reset not asserted
= 3.2mA, reset not asserted
V
V
SINK
SINK
MANUAL RESET INPUT (MAX6821/MAX6822/MAX6823/MAX6825)
V
0.3 × V
CC
IL
MR Input Voltage
V
0.7 × V
1
IH
CC
MR Minimum Input Pulse
MR Glitch Rejection
MR to Reset Delay
µs
ns
ns
kΩ
100
200
50
MR Pullup Resistance
25
75
WATCHDOG INPUT (MAX6821/MAX6822/MAX6823/MAX6824)
T
T
= -40°C to +85°C
= -40°C to +125°C
1.12
0.80
50
1.60
2.40
2.60
A
Watchdog Timeout Period
WDI Pulse Width (Note 2)
WDI Input Voltage
t
s
ns
V
WD
A
t
WDI
V
0.3 × V
CC
IL
V
0.7 × V
-20
IH
CC
WDI = V , time average
CC
120
-15
160
WDI Input Current
I
µA
WDI
WDI = 0, time average
Note 1: Over-temperature limits are guaranteed by design and not production tested. Devices tested at T = +25°C.
A
Note 2: Guaranteed by design and not production tested.
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MAX6821/MAX6825
Low-Voltage SOT23 µP Supervisors
with Manual Reset and Watchdog Timer
Typical Operating Characteristics
(T = +25°C, unless otherwise noted.)
A
RESET TIMEOUT PERIOD
vs. TEMPERATURE
SUPPLY CURRENT
vs. TEMPERATURE
V
TO RESET OUTPUT DELAY
vs. TEMPERATURE
CC
250
240
230
220
210
200
190
180
170
160
150
13
35
30
25
20
15
10
5
V
FALLING, V = V - 100mV
CC TH
CC
12
V
= +5V, L VERSION
CC
11
10
9
8
V
CC
= +3.3V, S VERSION
= +1.8V, V VERSION
7
6
V
CC
5
4
0
3
-40 -20
0
20 40 60 80 100 120
TEMPERATURE (°C)
-40 -20
0
20 40 60 80 100 120
TEMPERATURE (°C)
-40 -20
0
20 40 60 80 100 120
TEMPERATURE (°C)
WATCHDOG TIMEOUT PERIOD
vs. TEMPERATURE
MAXIMUM V TRANSIENT DURATION
CC
vs. RESET THRESHOLD OVERDRIVE
NORMALIZED RESET THRESHOLD
DELAY vs. TEMPERATURE
2.0
1.9
1.8
1.7
1.6
1.5
1.4
1.3
1.2
1.1
1.0
1.06
1.04
120
100
80
60
40
20
0
1.02
1.00
RESET OCCURS
ABOVE CURVE
0.98
0.96
0.94
0
20 40 60 80 100 120 140 160 180 200
-40 -20
0
20 40 60 80 100 120
TEMPERATURE (°C)
-40 -20
0
20 40 60 80 100 120
TEMPERATURE (°C)
RESET THRESHOLD OVERDRIVE (mV), V - V
TH
CC
VOLTAGE OUTPUT LOW
vs. SINK CURRENT
VOLTAGE OUTPUT HIGH
vs. SOURCE CURRENT
0.35
0.30
0.25
0.20
0.15
0.10
0.05
0
2.92
2.90
2.88
2.86
2.84
2.82
2.80
2.78
2.76
2.74
V
CC
= +2.9V
V
CC
= +2.9V
0
1
2
3
4
5
6
7
0
0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0
(mA)
I
(mA)
I
SOURCE
SINK
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MAX6821/MAX6825
Low-Voltage SOT23 µP Supervisors
with Manual Reset and Watchdog Timer
Pin Description
PIN NUMBERS
PIN
NAME
FUNCTION
MAX6821 MAX6822 MAX6823 MAX6824 MAX6825
Active-Low Open-Drain or Push-Pull Reset Output. RESET
changes from high to low when the V
input drops below the
CC
selected reset threshold, MR is pulled low, or the watchdog triggers
1
1
1
1
3
RESET
a reset. RESET remains low for the reset timeout period after V
CC
exceeds the device reset threshold, MR goes low to high, or the
watchdog triggers a reset.
Active-High Push-Pull Reset Output. RESET changes from low to
high when the V
input drops below the selected reset threshold,
CC
MR is pulled low, or the watchdog triggers a reset. RESET remains
1
3
2
RESET
high for the reset timeout period after V exceeds the device
CC
reset threshold, MR goes low to high, or the watchdog triggers a
reset.
2
3
2
3
2
3
2
4
GND
Ground
Active-Low Manual Reset Input. Internal 50kΩ pullup to V
.
CC
Pull low to force a reset. Reset remains active as long as MR is
MR
low and for the reset timeout period after MR goes high. Leave
unconnected or connect to V
if unused.
CC
Watchdog Input. If WDI remains high or low for longer than the
watchdog timeout period, the internal watchdog timer runs out
and a reset is triggered for the reset timeout period. The internal
watchdog timer clears whenever reset is asserted, the manual
reset is asserted, or WDI sees a rising or falling edge. If WDI is left
unconnected or is connected to a three-stated buffer output, the
watchdog feature is disabled.
4
5
4
5
4
5
4
5
WDI
5
V
Supply Voltage and Input for Reset Threshold Monitor
CC
returns high. MR has an internal 50kΩ pullup resistor,
so it can be left open if not used. This input can be dri-
ven with 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 dri-
ven 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.
Detailed Description
RESET/RESET Output
A µP’s reset input starts the µP in a known state. The
MAX6821–MAX6825 µP supervisory circuits assert a
reset to prevent code-execution errors during power-up,
power-down, and brownout conditions. Whenever V
falls below the reset threshold, the reset output asserts
low for RESET and high for RESET. Once V
the reset threshold, an internal timer keeps the reset out-
CC
exceeds
CC
Watchdog Input
put asserted for the specified reset timeout period (t );
RP
In the MAX6821–MAX6824, the watchdog circuit moni-
tors the µP’s activity. If the µP does not toggle (low to
high or high to low) the watchdog input (WDI) within the
watchdog timeout period (1.6s nominal), reset asserts
for the reset timoeout period. The internal 1.6s timer
can be cleared by either a reset pulse or by toggling
WDI. The WDI can detect pulses as short as 50ns.
While reset is asserted, the timer remains cleared and
does not count. As soon as reset is released, the timer
starts counting (see Figure 3).
after this interval, reset output returns to its original state
(see Figure 2).
Manual Reset Input
Many µP-based products require manual reset capabili-
ty, allowing the operator, a test technician, or external
logic circuitry to initiate a reset. On the MAX6821/
MAX6822/MAX6823/MAX6825, a logic low on MR
asserts a reset. Reset remains asserted while MR is
low, and for the timeout period (140ms min) after it
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MAX6821/MAX6825
Low-Voltage SOT23 µP Supervisors
with Manual Reset and Watchdog Timer
V
CC
MAX6821–
MAX6825
RESET (MAX6822–MAX6825)
RESET
GENERATOR
RESET
(MAX6821/MAX6824/MAX6825)
V
CC
1.26V
MR
(MAX6821–MAX6823,
MAX6825)
WATCHDOG
TRANSITION
DETECTOR
WATCHDOG
TIMER
WDI
(MAX6821–MAX6824)
GND
Figure 1. Functional Diagram
Disable the watchdog function by leaving WDI uncon-
nected or by three-stating the driver connected to WDI.
The watchdog input is internally driven low during the
first 7/8 of the watchdog timeout period and high for the
last 1/8 of the watchdog timeout period. When WDI is
left unconnected, this internal driver clears the 1.6s timer
every 1.4s. When WDI is three-stated or unconnected,
the maximum allowable leakage current is 10µA and the
maximum allowable load capacitance is 200pF.
V
CC
V
V
TH
TH
1V
1V
t
RP
RP
t
RD
RESET
t
t
RESET
GND
RD
Figure 2. Reset Timing Diagram
Applications Information
Watchdog Input Current
Interfacing to µPs with
Bidirectional Reset Pins
The MAX6821/MAX6822/MAX6823/MAX6824 WDI inputs
are internally driven through a buffer and series resistor
from the watchdog timer (Figure 1). When WDI is left
unconnected, the watchdog timer is serviced within the
watchdog timeout period by a low-high-low pulse from
the counter chain. For minimum watchdog input current
(minimum overall power consumption), leave WDI low for
the majority of the watchdog timeout period, pulsing it low-
high-low once within the first 7/8 of the watchdog timeout
period to reset the watchdog timer. If WDI is externally
driven high for the majority of the timeout period, up to
160µA can flow into WDI.
Since the RESET output on the MAX6822 is open drain,
it interfaces easily with µPs that have bidirectional reset
pins, such as the Motorola 68HC11. Connecting the µP
supervisor’s RESET output directly to the microcon-
troller’s RESET pin with a single pullup resistor allows
either device to assert reset (see Figure 4).
Negative-Going V
Transients
CC
These supervisors are relatively immune to short-dura-
tion, negative-going V transients (glitches), which
CC
usually do not require the entire system to shut down.
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MAX6821/MAX6825
Low-Voltage SOT23 µP Supervisors
with Manual Reset and Watchdog Timer
V
CC
t
RST
V
V
CC
CC
MAX6822
RESET*
RESET
RESET
µP
t
RP
t
t
RP
WD
RESET
GENERATOR
WDI
GND
GND
*RESET IS THE INVERSE OF RESET.
Figure 3. Watchdog Timing Relationship
Figure 4. Interfacing open-Drain RESET to µPs with
Bidirectional Reset I/O
Resets are issued to the µP during power-up, pow-
er-down, and brownout conditions. The Typical Operating
Characteristics show a graph of the MAX6821–MAX6825’s
START
Maximum V
Transient Duration vs. Reset Threshold
CC
SET WDI
HIGH
Overdrive, for which reset pulses are not generated. The
graph was produced using negative-going V pulses,
starting at the standard monitored voltage and ending
below the reset threshold by the magnitude indicated
(reset threshold overdrive). The graph shows the max-
CC
PROGRAM
CODE
SUBROUTINE OR
PROGRAM LOOP
imum pulse width that a negative-going V
transient
CC
can typically have without triggering a reset pulse. As the
amplitude of the transient increases (i.e., goes farther
below the reset threshold), the maximum allowable pulse
SET WDI LOW
width decreases. Typically, a V
transient that goes
CC
100mV below the reset threshold and lasts for 20µs or
less will not trigger a reset pulse.
RETURN
Figure 5. Watchdog Flow Diagram
Typical Operating Circuit
Watchdog Software Considerations
One way to help the watchdog timer monitor software
execution more closely is to set and reset the watchdog
input at different points in the program, rather than pulsing
the watchdog input high-low-high or low-high-low. This
technique avoids a stuck loop, in which the watchdog
timer would continue to be reset inside the loop, keeping
the watchdog from timing out.
V
CC
V
CC
V
CC
RESET
RESET
Figure 5 shows an example of a flow diagram where the
I/O driving the watchdog input is set high at the begin-
ning of the program, set low at the beginning of every
subroutine or loop, then set high 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, causing a reset or interrupt
to be issued. As described in the Watchdog Input Current
section, this scheme results in higher time average WDI
input current than does leaving WDI low for the majority of
the timeout period and periodically pulsing it low-high-low.
MAX6823
µP
I/O
WDI
MR
GND
MANUAL
RESET
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MAX6821/MAX6825
Low-Voltage SOT23 µP Supervisors
with Manual Reset and Watchdog Timer
Selector Guide
ACTIVE-LOW
ACTIVE-HIGH
RESET
OPEN-DRAIN
WATCHDOG
INPUT
MANUAL
FUNCTION
RESET
—
RESET
RESET INPUT
MAX6821
MAX6822
MAX6823
MAX6824
MAX6825
—
✔
—
—
—
✔
—
—
✔
✔
✔
✔
✔
✔
—
✔
✔
✔
—
✔
—
✔
✔
✔
Pin Configurations (continued)
TOP VIEW
RESET
GND
1
2
3
5
4
V
RESET
GND
1
2
3
5
4
V
CC
CC
MAX6824
MAX6825
RESET
WDI
RESET
MR
SOT23-5
SOT23-5
Chip Information
TRANSISTOR COUNT: 750
PROCESS: BiCMOS
Package Information
For the latest package outline information and land patterns
(footprints), go to www.maximintegrated.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 PACKAGE
LAND PATTERN
NO.
OUTLINE NO.
21-0057
TYPE
CODE
5 SOT23
U5-1
—
Maxim Integrated
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www.maximintegrated.com
MAX6821/MAX6825
Low-Voltage SOT23 µP Supervisors
with Manual Reset and Watchdog Timer
Revision History
REVISION REVISION
PAGES
CHANGED
DESCRIPTION
No /V OPNs; removed automotive reference from Applications section
NUMBER
DATE
3
7/14
1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim Integrated’s website at www.maximintegrated.com.
Maxim Integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim Integrated product. No circuit patent licenses
are implied. Maxim Integrated 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.
©
Maxim Integrated and the Maxim Integrated logo are trademarks of Maxim Integrated Products, Inc.
2014 Maxim Integrated Products, Inc.
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相关型号：
MAX6825WUK+T
Power Supply Management Circuit, Adjustable, 1 Channel, BICMOS, PDSO5, LEAD FREE, SOT-23, 5 PIN
MAXIM
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