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CAT812MEUST3 Datasheet(PDF) 7 Page - Catalyst Semiconductor

Part # CAT812MEUST3
Description  4-Pin Microprocessor Power Supply Supervisors with Manual Reset
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Manufacturer  CATALYST [Catalyst Semiconductor]
Direct Link  http://www.catalyst-semiconductor.com
Logo CATALYST - Catalyst Semiconductor

CAT812MEUST3 Datasheet(HTML) 7 Page - Catalyst Semiconductor

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CAT811, CAT812
7
Doc No. 3005, Rev. R
© 2005 by Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
VALID RESET WITH VCC UNDER 1.0 V
To ensure that the CAT811
RESET pin is in a known
state when VCC is under 1.0 V, a 100 kΩ pull-down
resistor between
RESET pin and GND is recommended;
the value is not critical. For the CAT812, a pull-up
resistor from RESET pin to VCC is needed.
Figure 3.
RESET
RESET
RESET
RESET
RESET Valid with VCC Under 1.0 V
Figure 4. RESET Valid with VCC Under 1.1 V
Figure 5. Bi-directional Reset Pin Interfacing
CAT811
GND
VCC
100k
Power
Supply
RESET
CAT812
GND
VCC
100k
Power
Supply
RESET
MR
MR
CAT811
GND
VCC
4.7k
Power
Supply
RESET
Buffered
RESET
BUF
Bi-directional
I/O Pin
RESET
INPUT
GND
µP
(For example: 68HC11)
MR
BI-DIRECTIONAL RESET PIN INTERFACING
The CAT811/812 can interface with
µP/µC bi-directional
reset pins by connecting a 4.7 k
Ω resistor in series with
the CAT811/812 reset output and the
µP/µCbi-directional
reset pin.


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