MAX823 Datasheet, PDF (1/8 Pages) Maxim Integrated Products – 5-Pin Microprocessor Supervisory Circuits

19-0487; Rev 1; 6/97
5-Pin Microprocessor Supervisory Circuits
_______________General Description ____________________________Features
The MAX823/MAX824/MAX825* microprocessor (µP)
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.
________________________Applications
o Precision Monitoring of +3V, +3.3V, and +5V
Power Supplies
o Operating Current: 10µA (MAX823L/M)
3µA (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
______________Ordering Information
Battery-Powered Computers and Controllers
Embedded Controllers
Intelligent Instruments
Automotive Systems
Critical µP Monitoring
Portable/Battery-Powered Equipment
PART^†
MAX823_EUK
MAX824_EUK
MAX825_EUK
TEMP. RANGE
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
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.
_____________________Selector Guide
FUNCTION
MAX823 MAX824 MAX825
SUFFIX
RESET
THRESHOLD (V)
Active-Low Reset
Active-High Reset
—
Watchdog Input
—
Manual-Reset Input
—
Typical Operating Circuit appears at end of data sheet.
L
4.63
M
4.38
T
3.08
S
2.93
R
2.63
Marking Information appears at end of data sheet.
__________________________________________________________Pin Configurations
TOP VIEW
RESET 1
5 V_CC
MAX823
GND 2
RESET 1
GND 2
5 V_CC
MAX824
RESET 1
5 V_CC
GND 2 ^MAX825
MR 3
4 WDI
RESET 3
4 WDI
RESET 3
4 MR
SOT23-5
SOT23-5
SOT23-5
*Patents Pending
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