TCM809/TCM810
3.3
Controllers and Processors With
Bidirectional I/O Pins
Buffered RESET
To Other System
Components
Buffer
Some microcontrollers have bidirectional reset pins.
Depending on the current drive capability of the control-
ler pin, an indeterminate logic level may result if there
is a logic conflict. This can be avoided by adding a
4.7 kΩ resistor in series with the output of the TCM809/
TCM810 (Figure 3-3). If there are other components in
the system that require a reset signal, they should be
buffered so as not to load the reset line. If the other
components are required to follow the reset I/O of the
microcontroller, the buffer should be connected as
shown with the solid line.
VDD
®
PICmicro
TCM809
Micro-
controller
RESET
4.7 kΩ
RESET
GND
GND
FIGURE 3-3:
Interfacing the TCM809 to a
Bidirectional RESET I/O.
DS21661C-page 6
2004 Microchip Technology Inc.
MICROCHIP [ MICROCHIP ]
