CAT803 CATALYST [Catalyst Semiconductor], CAT803 Datasheet - Page 7

• Manufacturer Part Number: CAT803
• Description: 3-Pin Microprocessor Power Supply Supervisors
• Manufacturer: CATALYST [Catalyst Semiconductor]

© 2007 by Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
VALID RESET WITH V
To ensure that the CAT809 RESET pin is in a known
state when V
between RESET pin and GND is recommended. For
the CAT810, a pull-up resistor from RESET pin to V
is needed.
Power
Supply
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.
Figure 3. reSeT Valid with V
CC
is under 1.0V, a >10kΩ pull-down resistor
Power
Supply
CAT809
GND
CC
V
unDER 1.0V
CC
RESET
CAT809
figure 5. bi-directional Reset Pin Interfacing
GND
CC
V
CC
RESET
under 1.0V
10kΩ
Bi-directional
I/O Pin
CC
7
Power
Supply
RESET
INPUT
figure 4. RESET Valid with V
BUF
GND
µP
V
CC
CAT810
Buffered
RESET
CAT803, CAT809, CAT810
GND
(For example:
68HC11)
V
CC
RESET
CC
under 1.1V
Doc No. 3004, Rev. X
10kΩ