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CAT824MSDI-GT3 Datasheet(PDF) 1 Page - ON Semiconductor

No. de pieza CAT824MSDI-GT3
Descripción Electrónicos  System Supervisory Voltage Reset with Watchdog and Manual Reset
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Fabricante Electrónico  ONSEMI [ON Semiconductor]
Página de inicio  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

CAT824MSDI-GT3 Datasheet(HTML) 1 Page - ON Semiconductor

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CAT823, CAT824, CAT825
© 2010 SCILLC. All rights reserved.
1
Doc. No. MD-3027, Rev. D
Characteristics subject to change without notice
System Supervisory Voltage Reset with
Watchdog and Manual Reset
FEATURES
n Automatically restarts microprocessor after
Power failure
n Monitors pushbutton for external override
n Accurate under voltage system monitoring
n Brownout detection system reset for use with
3.0, 3.3, and 5.0 volt systems
n Pin and function compatible with the
MAX823/24/25 products
n Operating Range from -40°C to +85°C
n Available in TSOT-23 5-lead and SC-70 packages
For Ordering Information details, see page 13 & 14.
APPLICATIONS
n Microprocessor and Microcontroller based
systems
n Intelligent Instruments
n Control Systems
n Critical µP Monitors
n Portable Equipment
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 device’s specified trip value and then maintains
the reset output active condition until the device’s
internal timer, after a minimum timer of 140ms; 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 push-
button or a processor signal.
PIN CONFIGURATION
TSOT-23 5-Lead
SC-70 5-Lead
VCC
CAT823
MR
2
3
1
WDI
5
4
RESET
GND
RESET
MR
VCC
CAT824
RESET
2
3
1
WDI
5
4
RESET
GND
VCC
CAT825
RESET
2
3
1
5
4
GND
PIN FUNCTIONS
Pin Name
Function
RESET
¯¯¯¯¯¯
CMOS Push-Pull Active Low Reset
Output
GND
Ground
MR
¯¯¯
Manual Reset input – Pulled high
Internally by a 52k
Ω resistor designed
to be driven low by a mechanical
pushbutton, open drain output or CMOS
output.
RESET
CMOS Push-Pull Active High Reset
Output
WDI
Watchdog Timer Input – Designed to be
driven by a processor output or can be
disabled by tri-stating or leaving open.
VCC
Power Supply


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