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CAT809RSDI-T3 Datasheet(PDF) 7 Page - ON Semiconductor

Part # CAT809RSDI-T3
Description  3-Pin Microprocessor Power Supply Supervisors
Download  11 Pages
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Manufacturer  ONSEMI [ON Semiconductor]
Direct Link  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

CAT809RSDI-T3 Datasheet(HTML) 7 Page - ON Semiconductor

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CAT803, CAT809, CAT810
http://onsemi.com
7
Valid RESET with VCC Under 1.0 V
To ensure that the CAT809 RESET pin is in a known state when VCC is under 1.0 V, a >10 kW pull−down resistor between
RESET pin and GND is recommended. For the CAT810, a pull−up resistor from RESET pin to VCC is needed.
Figure 8. RESET Valid with VCC Under 1.0 V
Figure 9. RESET Valid with VCC Under 1.1 V
CAT809
GND
Power
10 kW
Supply
CAT810
GND
Power
Supply
RESET
VCC
RESET
10 kW
VCC
Bi−directional Reset Pin Interfacing
The CAT809/810 can interface with
mP/mC bi−directional reset pins by connecting a 4.7 kW resistor in series with the
CAT809/810 reset output and the
mP/mC bi−directional reset pin.
Figure 10. Bi−directional Reset Pin Interfacing
CAT809
GND
Power
Supply
BUF
Buffered
RESET
GND
Bi−directional
I/O Pin
mP
(For example:
68HC11)
VCC
VCC
4.7 kW
RESET
RESET
INPUT
CAT803 Open−Drain RESET Application
The CAT803 features an open−drain RESET output and
therefore needs a pull−up resistor on the output for proper
operation, as shown on Figure 11. An advantage of the
open−drain output includes the ability to “wire AND”
several outputs together to form an inexpensive logic circuit.
It is also possible to have the pull−up resistor connected to
a different supply which can be higher than the CAT803 VCC
pin. The value of the pull−up resistor is not critical in most
applications, typical values being between 5 k
W and 10 kW.
Figure 11. Typical CAT803 Open−Drain
Circuit Configuration
CAT803
GND
Power
Supply
GND
mP
VCC
VCC
5 kW
RESET
RESET
INPUT


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