19-0487; Rev 1; 6/97
5-Pin Microprocessor Supervisory Circuits
_______________General Description
The MAX823/MAX824/MAX825* microprocessor (碌P)
supervisory circuits combine reset output, watchdog,
and manual-reset input functions in a 5-pin SOT23-5
package. They significantly improve system reliability
and accuracy compared to separate ICs or discrete
components. The MAX823/MAX824/MAX825 are
specifically designed to ignore fast transients on V
CC
.
Five preprogrammed reset threshold voltages are
available, designated by the following package
suffixes: L = 4.63V, M = 4.38V, T = 3.08V, S = 2.93V,
and R = 2.63V. All three devices have an active-low
reset output, which is guaranteed to be in the correct
state for V
CC
down to 1V. The MAX824/MAX825 also
have an active-high reset output. The following
Selector
Guide
explains the functions offered in this series of
parts.
____________________________Features
o
Precision Monitoring of +3V, +3.3V, and +5V
Power Supplies
o
Operating Current: 10碌A (MAX823L/M)
3碌A (MAX825T/S/R)
o
Fully Specified Over Temperature
o
140ms Min Power-On Reset
o
Guaranteed RESET Valid to V
CC
= 1V
o
Power-Supply Transient Immunity
o
Watchdog Timer with 1.6sec Timeout
(MAX823/MAX824)
o
Manual-Reset Input (MAX823/MAX825)
o
No External Components
MAX823/MAX824/MAX825
________________________Applications
Battery-Powered Computers and Controllers
Embedded Controllers
Intelligent Instruments
Automotive Systems
Critical 碌P Monitoring
Portable/Battery-Powered Equipment
______________Ordering Information
PART
鈥?/div>
MAX823_EUK
MAX824_EUK
MAX825_EUK
TEMP. RANGE
-40掳C to +85掳C
-40掳C to +85掳C
-40掳C to +85掳C
PIN-PACKAGE
5 SOT23-5
5 SOT23-5
5 SOT23-5
鈥?/div>
Insert the desired suffix letter (from the table below) into the
blank to complete the part number.
RESET
THRESHOLD (V)
4.63
4.38
3.08
2.93
2.63
_____________________Selector Guide
SUFFIX
FUNCTION
Active-Low Reset
Active-High Reset
Watchdog Input
Manual-Reset Input
鈥?/div>
鈥?/div>
鈥?/div>
MAX823
MAX824
MAX825
L
M
T
S
R
Typical Operating Circuit appears at end of data sheet.
Marking Information appears at end of data sheet.
__________________________________________________________Pin Configurations
TOP VIEW
RESET
1
5
V
CC
RESET
1
5
V
CC
RESET
1
5
V
CC
GND
2
MAX823
GND
2
MAX824
GND
2
MAX825
MR
3
4
WDI
RESET
3
4
WDI
RESET
3
4
MR
SOT23-5
SOT23-5
SOT23-5
*Patents Pending
________________________________________________________________
Maxim Integrated Products
1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.
For small orders, phone 408-737-7600 ext. 3468.
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