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CAT825 Schematic ( PDF Datasheet ) - ON Semiconductor

Teilenummer CAT825
Beschreibung System Supervisory Voltage Reset
Hersteller ON Semiconductor
Logo ON Semiconductor Logo 




Gesamt 12 Seiten
CAT825 Datasheet, Funktion
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 device’s specified trip value and then maintains the reset output
active condition until the device’s 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 pushbutton 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 40°C to +85°C
Available in TSOT23 5lead and SC70 Packages
These Devices are PbFree, 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 PushPull Active Low Reset Output
GND
Ground
MR Manual Reset input – 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 PushPull Active High Reset Output
WDI Watchdog Timer Input – Designed to be driven by a processor
output or can be disabled by tristating or leaving open.
VCC Power Supply
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SC70
SD SUFFIX
CASE 419AC
TSOT23
TD SUFFIX
CASE 419AE
PIN CONNECTIONS
1
RESET
VCC
GND
CAT823
MR WDI
1
RESET
GND
CAT824
RESET
VCC
WDI
1
RESET
GND
CAT825
RESET
(Top Views)
VCC
MR
MARKING DIAGRAM
XXXMG
G
XXX
M
G
= Specific Device Code
= Date Code
= PbFree 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
May, 2012 Rev. 8
1
Publication Order Number:
CAT823/D






CAT825 Datasheet, Funktion
CAT823, CAT824, CAT825
Watchdog Timer
The CAT823 and CAT824 provide a Watchdog input
(WDI). The watchdog timer function forces RESET (and
RESET in the CAT824) signals active when the WDI input
does not have a transition from lowtohigh or hightolow
within 1.12 seconds. Timeout of the watchdog starts when
RESET (RESET on the CAT824) becomes inactive. If a
transition occurs on the WDI input pin prior to the watchdog
timeout, the watchdog timer is reset and begins to timeout
again. If the watchdog timer is allowed to timeout, then the
reset output(s) will go active for tRP and once released will
repeat the watchdog timeout process.
Figure 6 below shows a typical implementation of a
watchdog function. Any processor signal that repeats
dependant on the normal operation of the processor or
directed by the software operating on the processor can be
used to strobe the watchdog input. The most reliable is a
dedicated I/O output transitioned by a specific software
instruction.
The watchdog can be disabled by floating (or tristating)
the WDI input (see Figure 7). If the watchdog is disabled the
WDI pin will be pulled low for the first 7/8th’s of the
watchdog period (tWD) and pulled high for the last 1/8th of
the watchdog period. This pulling low of the WDI input and
then high is used to detect an open or tristate condition and
will continue to repeat until the WDI input is driven high or
low.
For most efficient operation of devices with the watchdog
function the WDI input should be held low the majority of
the time and only strobed high as required to reset the
watchdog timer.
WDI
Supply
Voltage
VCC
CAT823
MR
GND
RESET
PIC
μC
MCLR
ADDRESS DECODER
Figure 6. Watchdog Timer
RESET
GND
MR
VCC
VCC
Tristate
CAT823
150 kW
WDI
110 kW
mC
OUTPUT
Figure 7. Watchdog Disable Circuit
WDI
RESET
INVALID
STROBE
VALID
STROBE
tWD
MIN.
Figure 8. Timing Diagram – Strobe Input
INDETERMINATE
STROBE
MAX.
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6

6 Page









CAT825 pdf, datenblatt
CAT823, CAT824, CAT825
ORDERING INFORMATION
Order Number
NiPdAu
Voltage
Top Mark
NiPdAu
Inputs
MR WDI
Outputs
RESET RESET
Package
Quantity
per Reel
CAT825LTDIGT3
4.63 V
ECA
*
**
CAT825MTDIGT3
4.38 V
ECA
*
**
CAT825TTDIGT3
3.08 V
ECA
*
**
CAT825STDIGT3
2.93 V
ECA
*
* * TSOT235
CAT825RTDIGT3
2.63 V
ECA
*
**
CAT825ZTDIGT3
2.32 V
ECA
*
**
CAT825YTDIGT3
CAT825LSDIGT3
2.19 V
4.63 V
ECA
ECA
*
*
**
**
3,000
CAT825MSDIGT3
4.38 V
ECA
*
**
CAT825TSDIGT3
3.08 V
ECA
*
**
CAT825SSDIGT3
2.93 V
ECA
*
* * SC705
CAT825RSDIGT3
2.63 V
ECA
*
**
CAT825ZSDIGT3
2.32 V
ECA
*
**
CAT825YSDIGT3
2.19 V
ECA
*
**
5. All packages are RoHScompliant (Leadfree, Halogenfree).
6. The standard lead finish is NiPdAu.
7. Contact factory for package availability.
8. For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging
Specifications Brochure, BRD8011/D.
9. For detailed information and a breakdown of device nomenclature and numbering systems, please see the ON Semiconductor Device
Nomenclature document, TND310/D, available at www.onsemi.com
ON Semiconductor and
are registered trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC reserves the right to make changes without further notice
to any products herein. SCILLC makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does SCILLC assume any liability
arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages.
“Typical” parameters which may be provided in SCILLC data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All
operating parameters, including “Typicals” must be validated for each customer application by customer’s technical experts. SCILLC does not convey any license under its patent rights
nor the rights of others. SCILLC products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications
intended to support or sustain life, or for any other application in which the failure of the SCILLC product could create a situation where personal injury or death may occur. Should
Buyer purchase or use SCILLC products for any such unintended or unauthorized application, Buyer shall indemnify and hold SCILLC and its officers, employees, subsidiaries, affiliates,
and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death
associated with such unintended or unauthorized use, even if such claim alleges that SCILLC was negligent regarding the design or manufacture of the part. SCILLC is an Equal
Opportunity/Affirmative Action Employer. This literature is subject to all applicable copyright laws and is not for resale in any manner.
PUBLICATION ORDERING INFORMATION
LITERATURE FULFILLMENT:
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12
ON Semiconductor Website: www.onsemi.com
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For additional information, please contact your local
Sales Representative
CAT823/D

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