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Maxim Integrated Semiconductor Electronic Components Datasheet

MAX6822 Datasheet

Low-Voltage SOT23 uP Supervisors

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MAX6821/MAX6825
Low-Voltage SOT23 µP Supervisors
with Manual Reset and Watchdog Timer
General Description
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-
ing it asserted for a minimum timeout period after VCC rises
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
be in the correct state for VCC down to +1.0V.
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.
Applications
● Set-Top Boxes
● Computers and Con-
trollers
● Embedded Controllers
● Intelligent Instruments
● Critical µP Monitoring
● Portable/Battery-
Powered Equipment
Pin Configurations
TOP VIEW
RESET(RESET) 1
GND 2
MAX6821
MAX6822
MAX6823
5 VCC
MR 3
4 WDI
(RESET) MAX6821 ONLY
SOT23-5
Pin Configurations continued at end of data sheet.
Typical Operating Circuit appears at end of data sheet.
Features
● 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
Push-Pull RESET
Open-Drain RESET
● Guaranteed Reset Valid to VCC = +1.0V
● Immune to Short Negative VCC Transients
● No External Components
● Small 5-Pin SOT23 Packages
Ordering Information
PART*
TEMP RANGE
PIN-PACKAGE
MAX6821_UK-T -40°C to +125°C
5 SOT23-5
MAX6822_UK-T -40°C to +125°C
5 SOT23-5
MAX6823_UK-T -40°C to +125°C
5 SOT23-5
MAX6824_UK-T -40°C to +125°C
5 SOT23-5
MAX6825_UK-T -40°C to +125°C
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.
Threshold Suffix Guide
SUFFIX
L
M
RESET
THRESHOLD (V)
4.63
4.38
T 3.08
S 2.93
R 2.63
Z 2.32
Y 2.19
W 1.67
V 1.58
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.
Selector Guide appears at end of data sheet.
19-1868; Rev 3; 7/14


Maxim Integrated Semiconductor Electronic Components Datasheet

MAX6822 Datasheet

Low-Voltage SOT23 uP Supervisors

No Preview Available !

MAX6821/MAX6825
Low-Voltage SOT23 µP Supervisors
with Manual Reset and Watchdog Timer
Absolute Maximum Ratings
VCC to GND..........................................................-0.3V to +6.0V
Open-Drain RESET...............................................-0.3V to +6.0V
Push-Pull RESET, RESET, MR, WDI........ -0.3V to (VCC + 0.3V)
Input Current (VCC).............................................................20mA
Output Current (RESET, RESET).......................................20mA
Continuous Power Dissipation (TA = +70°C)
5-Pin SOT23 (derate 7.1mW/°C above +70°C)...........571mW
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
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 = +4.5V to +5.5V for MAX682_L/M, VCC = +2.7V to +3.6V for MAX682_T/S/R, VCC = +2.1V to +2.75V for MAX682_Z/Y, VCC =
+1.53V to +2.0V for MAX682_W/V, TA = -40°C to +125°C, unless otherwise specified. Typical values are at TA = +25°C.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
Operating Voltage Range
VCC Supply Current
(MR and WDI Unconnected)
VCC
TA = 0°C to +85°C
TA = -40°C to +125°C
1.0 5.5 V
1.2 5.5
VCC = +5.5V, no load
TA = -40°C to +85°C
TA = -40°C to +125°C
10 20
30
ICC
VCC = +3.6V, no load
TA = -40°C to +85°C
TA = -40°C to +125°C
7 16
µA
25
VCC = +3.6V, no load TA = -40°C to +85°C
(MAX6825 only)
TA = -40°C to +125°C
5 12
20
VCC Reset Threshold
(VCC Falling)
MAX682_L
MAX682_M
MAX682_T
MAX682_S
VTH MAX682_R
MAX682_Z
MAX682_Y
MAX682_W
MAX682_V
TA = -40°C to +85°C
TA = -40°C to +125°C
TA = -40°C to +85°C
TA = -40°C to +125°C
TA = -40°C to +85°C
TA = -40°C to +125°C
TA = -40°C to +85°C
TA = -40°C to +125°C
TA = -40°C to +85°C
TA = -40°C to +125°C
TA = -40°C to +85°C
TA = -40°C to +125°C
TA = -40°C to +85°C
TA = -40°C to +125°C
TA = -40°C to +85°C
TA = -40°C to +125°C
TA = -40°C to +85°C
4.50
4.47
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
4.63
4.63
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
4.75
4.78
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
V
Reset Threshold Temperature
Coefficient
60 ppm/°C
Reset Threshold Hysteresis
VCC to Reset Output Delay
tRD VCC = VTH to (VTH - 100mV)
2 × VTH
20
mV
µs
www.maximintegrated.com
Maxim Integrated 2


Part Number MAX6822
Description Low-Voltage SOT23 uP Supervisors
Maker Maxim
Total Page 9 Pages
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