IMP6303
Application Information
Negative V
CC
Transients
The IMP6303 protect µPs from brownouts and low V
CC
. Short dura-
tion transients of 100mV amplitude and 20µs or less duration typi-
cally do not cause a false RESET.
Valid Reset with V
CC
under 1.1V
To ensure logic inputs connected to the IMP6303 RESET pin are in
a known state when V
CC
is under 1.1V, a 100kΩ pull-down
resistor at RESET is needed. The value is not critical.
Bi-directional Reset Pin Interfacing
The IMP6303 can interface with µP/µC bi-directional reset pins
by connecting a 4.7kΩ resistor in series with the IMP6303 reset
output and the µP/µC bi-directional reset pin.
BUF
Buffered
RESET
VCC
VCC
Power
Supply
IMP6303
RESET
GND
100kΩ
Power
Supply
IMP6303
4.7kΩ
RESET
GND
µC
or
µP
RESET
Input
GND
Bi-directional I/O Pin
(Example: 68HC11)
6303_06.eps
6303_04.eps
Figure 2. RESET Valid with V
CC
Under 1.1V
Figure 3. Bi-directional Reset Pin Interfacing
© 2001 IMP, Inc.
Microprocessor Supervisor
5
IMP [ IMP, INC ]
