TCM809 Microchip Technology, Inc., TCM809 Datasheet - Page 5

• Manufacturer Part Number: TCM809
• Description: The TCM809 And TCM810 Are Cost-effective System Supervisor Circuits Designed to Monitor VCC in Digital Systems And Provide a Reset Signal to The Host Processor When Necessary
• Manufacturer: Microchip Technology, Inc.

2.3
Some microcontrollers have bi-directional 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 k resistor in series with the output of the TCM809/
TCM810 (Figure 2-3). If there are other components in
the system which 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.
2002 Microchip Technology Inc.
Controllers and Processors With
Bidirectional I/O Pins
FIGURE 2-3:
Bidirectional RESET I/O.
V
DD
TCM809
GND
RESET
TCM809/TCM810
Interfacing
4.7 k
BUFFER
RESET
controller
Micro
GND
the
TCM809
Buffered RESET
To Other System
Components
DS21661B-page 5
to
a