19-1868; Rev 1; 1/01
Low-Voltage SOT23 µP Supervisors with
Manual Reset and Watchdog Timer
General Description
Features
The MAX6821–MAX6825 are low-voltage microprocessor
(µP) supervisory circuits that combine voltage monitor-
ing, watchdog timer, and manual reset input functions in
a 5-pin SOT23 package. Microprocessor supervisory cir-
cuits significantly improve system reliability and accura-
cy compared to separate ICs or discrete components.
These devices assert a reset signal whenever the moni-
tored voltage drops below its preset threshold, keeping it
o Monitors +1.8V, +2.5V, +3.0V, +3.3V, +5.0V
Supplies
o 140ms (min) Reset Timeout Delay
o 1.6s Watchdog Timeout Period
(MAX6821/MAX6822/MAX6823/MAX6824)
o Manual Reset Input
(MAX6821/MAX6822/MAX6823/MAX6825)
o Three Reset Output Options
asserted for a minimum timeout period after V
rises
CC
above the threshold. In addition, a watchdog timer moni-
tors against code execution errors. A debounced manual
reset is also available. The MAX6821–MAX6825 monitor
voltages from +1.8V to +5.0V. These outputs are guaran-
Push-Pull RESET
Push-Pull RESET
Open-Drain RESET
teed to be in the correct state for V
down to +1.0V.
CC
o Guaranteed Reset Valid to V
o Immune to Short Negative V
o No External Components
= +1.0V
CC
Nine preprogrammed reset threshold voltages are
available (see 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.
Transients
CC
o 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
5 SOT23-5
5 SOT23-5
5 SOT23-5
5 SOT23-5
5 SOT23-5
MAX6821_UK-T
MAX6822_UK-T
MAX6823_UK-T
MAX6824_UK-T
MAX6825_UK-T
________________________Applications
*Insert the desired suffix letter (from the table below) into the blank
to complete the part number.
Set-Top Boxes
Automotive Systems
Critical µP Monitoring
Computers and
Controllers
Portable/Battery-
Powered Equipment
Threshold Suffix Guide
Embedded Controllers
Intelligent Instruments
RESET
SUFFIX
THRESHOLD (V)
Pin Configurations
L
M
T
4.63
4.38
3.08
2.93
2.63
2.32
2.19
1.67
1.58
TOP VIEW
RESET(RESET)
1
2
3
5
4
V
CC
S
R
Z
MAX6821
MAX6822
MAX6823
GND
MR
Y
W
V
WDI
SOT23-5
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.
(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.
________________________________________________________________ Maxim Integrated Products
1
For price, delivery, and to place orders, please contact Maxim Distribution at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.