TCM809 View Datasheet(PDF) - Microchip Technology

Part Name

Description

Manufacturer

TCM809

3-Pin Microcontroller Reset Monitors

Microchip Technology 

TCM809/TCM810

3.3 Controllers and Processors With

Bidirectional I/O Pins

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.

Buffer

Buffered RESET

To Other System

Components

VDD

TCM809

RESET

4.7 kΩ

PICmicro®

Micro-

controller

RESET

GND

GND

FIGURE 3-3:

Interfacing the TCM809 to a

Bidirectional RESET I/O.

DS21661C-page 6

 2004 Microchip Technology Inc.

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