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ON Semiconductor - (CAT705 - CAT813) uP Supervisory Circuits

Numéro de référence CAT813
Description (CAT705 - CAT813) uP Supervisory Circuits
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CAT813 fiche technique
µP Supervisory Circuits
CAT705, CAT706, CAT813
FEATURES
n Reset guaranteed valid for 1.0 V VCC
n 6µA supply current
n 200ms Reset pulse width
n Watchdog timer function 1.6s timeout
n Accurate brownout detection reset in 3.0, 3.6,
and 5.0 volt systems
n Secondary low supply monitoring on PFI input
n Pin and function compatible with the
MAX705/MAX706/MAX813L products
n Operating Range from -40°C to +85°C
n RoHS Compliant SOIC 8-lead and MSOP 8-lead
packages
APPLICATIONS
n Microprocessor and microcontroller based
systems
n Instrument and control systems
n Portable equipment
DESCRIPTION
The CAT705, CAT706, and CAT813 provide 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
allows the system power supply to stabilize.
The devices have a watchdog input which can be
used to monitor a system signal and causes W¯¯D¯O¯ to
go low if the signal fails to change state prior to a
timeout condition.
The supervisory circuits provide a ¯M¯R¯ input which
initiates a reset if pulled low. The CAT705 and
CAT706 provide an active low R¯¯E¯S¯E¯T¯ output. The
CAT813 provides an active high RESET output.
There is a secondary supply monitor (PFI) included for
power-fail warning.
For Ordering Information details, see page 13.
PIN CONFIGURATION
SOIC 8-Lead
MR 1
8 WDO
VCC 2
GND 3
7 RESET
(RESET for CAT813)
6 WDI
PFI 4
5 PFO
MSOP 8-Lead
RESET 1
(RESET for CAT813)
WDO 2
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MR 3
8 WDI
7 PFO
6 PFI
VCC 4
5 GND
PIN FUNCTIONS
Pin Name
¯M¯R¯
VCC
GND
PFI
¯P¯F¯O¯
WDI
R¯¯E¯S¯E¯T¯
RESET
¯W¯¯D¯O¯
Function
Manual Reset Input
Power Supply
Ground
Power Fail voltage monitor Input.
Power Fail Output
Watchdog Timer Input
CMOS Push-Pull Active Low Reset
Output (CAT705 & CAT706)
CMOS Push-Pull Active High Reset
Output (CAT813)
Watchdog Timer Output
© 2010 SCILLC. All rights reserved.
Characteristics subject to change without notice
1
Doc. No. MD-3030, Rev. D

PagesPages 14
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