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PDF CAT825 Data sheet ( Hoja de datos )
| Número de pieza | CAT825 | |
| Descripción | System Supervisory Voltage Reset | |
| Fabricantes | ON Semiconductor | |
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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 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 push−button 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 TSOT−23 5−lead and SC−70 Packages
• These Devices are Pb−Free, 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 Push−Pull 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 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
http://onsemi.com
SC−70
SD SUFFIX
CASE 419AC
TSOT−23
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
= Pb−Free 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
1 page  
CAT823, CAT824, CAT825
FUNCTIONAL DESCRIPTION
Processor RESET
The CAT823−825 detect supply voltage (VCC) conditions
that are below the specified voltage trip value (VRST) and
provide a reset output to maintain correct system operation.
On power−up, RESET (and RESET if available) are kept
active for a minimum delay tRP of 140 ms after the supply
voltage (VCC) rises above VRST to allow the power supply
and processor to stabilize. When VCC drops below the
voltage trip value (VRST), the reset output signals RESET
(and RESET) are pulled active. RESET (and RESET if
available) is specifically designed to provide the reset input
signals for processors. This provides reliable and consistent
operation as power is turned on, off or during brownout
conditions by maintaining the processor operation in known
conditions.
Manual RESET
The CAT823 and CAT825 each have a Manual Reset
(MR) input to allow for alternative control of the reset
outputs. The MR input is designed for direct connection to
a pushbutton (see Figure 4). The MR input is internally
pulled up by 52 kW resistor and must be pulled low to cause
the reset outputs to go active. Internally, this input is
debounced and timed such that RESET (and RESET)
signals of at least 140 ms minimum will be generated. The
min 140 ms tRP delay commences as the Manual Reset input
is released from the low level. (see Figure 5)
MR
Supply
Voltage
VCC
CAT825
RESET
GND
RESET
MR
RESET
RESET
Figure 4. Pushbutton RESET
tPDLY
VIL
tPB
VIH
tRP
VOH
VOL
Figure 5. Timing Diagram – Pushbutton RESET
http://onsemi.com
5
5 Page 
CAT823, CAT824, CAT825
ORDERING INFORMATION
Order Number
NiPdAu
CAT823LTDI−GT3
CAT823MTDI−GT3
CAT823TTDI−GT3
CAT823STDI−GT3
CAT823RTDI−GT3
CAT823ZTDI−GT3
CAT823YTDI−GT3
CAT823LSDI−GT3
CAT823MSDI−GT3
CAT823TSDI−GT3
CAT823SSDI−GT3
CAT823RSDI−GT3
CAT823ZSDI−GT3
CAT823YSDI−GT3
Voltage
4.63 V
4.38 V
3.08 V
2.93 V
2.63 V
2.32 V
2.19 V
4.63 V
4.38 V
3.08 V
2.93 V
2.63 V
2.32 V
2.19 V
Top Mark
NiPdAu
ETA
ETA
ETA
ETA
ETA
ETA
ETA
ETA
ETA
ETA
ETA
ETA
ETA
ETA
Inputs
MR WDI
**
**
**
**
**
**
**
**
**
**
**
**
**
**
Outputs
RESET RESET
*
*
*
*
*
*
*
*
*
*
*
*
*
*
Package
TSOT−23−5
SC−70−5
Quantity
per Reel
3,000
CAT824LTDI−GT3
CAT824MTDI−GT3
CAT824TTDI−GT3
CAT824STDI−GT3
CAT824RTDI−GT3
CAT824ZTDI−GT3
CAT824YTDI−GT3
CAT824UTDI−GT3
CAT824LSDI−GT3
CAT824MSDI−GT3
CAT824TSDI−GT3
CAT824SSDI−GT3
CAT824RSDI−GT3
CAT824ZSDI−GT3
CAT824YSDI−GT3
4.63 V
4.38 V
3.08 V
2.93 V
2.63 V
2.32 V
2.19 V
2.00 V
4.63 V
4.38 V
3.08 V
2.93 V
2.63 V
2.32 V
2.19 V
EFA
EFA
EFA
EFA
EFA
EFA
EFA
EFA
EFA
EFA
EFA
EFA
EFA
EFA
EFA
** *
** *
** *
** *
TOST−23−5
** *
** *
** *
** *
3,000
** *
** *
** *
* * * SC−70−5
** *
** *
** *
5. All packages are RoHS−compliant (Lead−free, Halogen−free).
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
http://onsemi.com
11
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet CAT825.PDF ] | |
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