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CAT824_12 Datasheet, PDF (1/12 Pages) ON Semiconductor – System Supervisory Voltage Reset | |||
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CAT823, CAT824, CAT825
System Supervisory Voltage
Reset with Watchdog and
Manual Reset
Description
The CAT823, CAT824, and CAT825 provide basic reset and
monitoring functions for the electronic systems. Each device monitors the
system voltage and maintains a reset output until that voltage reaches
the deviceâs specified trip value and then maintains the reset output
active condition until the deviceâs internal timer, after a minimum
timer of 140 ms; to allow the systems power supply to stabilize.
The CAT823 and CAT824 also have a watchdog input which can be
used to monitor a system signal and cause a reset to be issued if the
signal fails to change state prior to a timeout condition.
The CAT823 and CAT825 also provide a manual reset input which
can be used to initiate reset if pulled low. This input can be directly
attached to a pushâbutton or a processor signal.
Features
⢠Automatically Restarts Microprocessor after Power Failure
⢠Monitors Pushbutton for External Override
⢠Accurate Under Voltage System Monitoring
⢠Brownout Detection System Reset for use with 3.0, 3.3, and 5.0 Volt
Systems
⢠Pin and Function Compatible with the MAX823/24/25 Products
⢠Operating Range from â40°C to +85°C
⢠Available in TSOTâ23 5âlead and SCâ70 Packages
⢠These Devices are PbâFree, Halogen Free/BFR Free and are RoHS
Compliant
Applications
⢠Microprocessor and Microcontroller Based Systems
⢠Intelligent Instruments
⢠Control Systems
⢠Critical mP Monitors
⢠Portable Equipment
PIN FUNCTIONS
Pin Name
Function
RESET CMOS PushâPull Active Low Reset Output
GND
Ground
MR
Manual Reset input â Pulled high Internally by a 52 kW res-
istor designed to be driven low by a mechanical pushbutton,
open drain output or CMOS output.
RESET CMOS PushâPull Active High Reset Output
WDI
Watchdog Timer Input â Designed to be driven by a processor
output or can be disabled by triâstating or leaving open.
VCC
Power Supply
http://onsemi.com
SCâ70
SD SUFFIX
CASE 419AC
TSOTâ23
TD SUFFIX
CASE 419AE
PIN CONNECTIONS
1
RESET
VCC
GND
CAT823
MR
WDI
1
RESET
VCC
GND
CAT824
RESET
WDI
1
RESET
VCC
GND
CAT825
RESET
MR
(Top Views)
MARKING DIAGRAM
XXXMG
G
XXX
M
G
= Specific Device Code
= Date Code
= PbâFree Package*
(*Note: Microdot may be in either location)
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 11 of this data sheet.
© Semiconductor Components Industries, LLC, 2012
1
May, 2012 â Rev. 8
Publication Order Number:
CAT823/D
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