CAT803, CAT809, CAT810
VALID RESET WITH V
CC
unDER 1.0V
To ensure that the CAT809
RESET
pin is in a known
state when V
CC
is under 1.0V, a >10kΩ pull-down resistor
between
RESET
pin and GND is recommended. For
the CAT810, a pull-up resistor from RESET pin to V
CC
is needed.
Power
Supply
V
CC
Power
Supply
V
CC
CAT809
RESET
GND
10kΩ
CAT810
RESET
10kΩ
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 CAT809/80 can interface with µP/µC bi-directional
reset pins by connecting a 4.7kΩ resistor in series with
the CAT809/80 reset output and the µP/µC bi-directional
reset pin.
BUF
Power
Supply
V
CC
V
CC
Buffered
RESET
CAT809
RESET
GND
Bi-directional
I/O Pin
µP
RESET
INPUT
GND
(For example:
68HC11)
figure 5. bi-directional Reset Pin Interfacing
© 2007 by Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
7
Doc No. 3004, Rev. X
CATALYST [ CATALYST SEMICONDUCTOR ]
