CAT811, CAT812
VALID RESET WITH V
CC
UNDER 1.0V
¯¯¯¯¯¯
To ensure that the CAT811 RESET pin is in a known
state when V
CC
is under 1.0V, a 100kΩ 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 V
CC
is
needed.
Power
Supply
V
CC
Power
Supply
V
CC
100kΩ
CAT811
MR
RESET
GND
100kΩ
CAT812
MR
RESET
GND
¯¯¯¯¯¯
Figure 3. RESET Valid with V
CC
under 1.0V
Figure 4. RESET Valid with V
CC
under 1.1V
BI-DIRECTIONAL RESET PIN INTERFACING
The CAT811/812 can interface with µP/µC bi-
directional reset pins by connecting a 4.7kΩ resistor in
series with the CAT811/812 reset output and the
µP/µC bi-directional reset pin.
BUF
Power
Supply
Buffered
RESET
CAT811
4.7kΩ
MR
RESET
GND
V
CC
(for example: 68HC11)
µP
RESET
INPUT
CAT811
GND
Bi-directional I/O Pin
Figure 5. Bi-directional Reset Pin Interfacing
© Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
7
Doc. No. MD-3005 Rev. S
CATALYST [ CATALYST SEMICONDUCTOR ]
