5-Pin Microprocessor Supervisory Circuits - Maxim
Description
19-0487; Rev 1; 6/97
5-Pin Microprocessor Supervisory Circuits
_______________General Description
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 VCC.
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 VCC 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: 10µA (MAX823L/M) 3µA (MAX825T/S/R) o Fully Specified Over Temperature o 140ms Min Power-On Reset o Guaranteed RESET Valid to VCC = 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 µP Monitoring Portable/Battery-Powered Equipment
______________Ordering Information
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.
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 — — — MAX823 MAX824 MAX825 L M T S R
Typical Operatin...
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