MCP809, MCP810

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SNVS165A – JUNE 2001 – REVISED MAY 2013

Figure 10. Maximum Transient Duration without Causing a Reset Pulse vs. Reset Comparator Overdrive

Interfacing to µPs with Bidirectional Reset Pins

Microprocessors with bidirectional reset pins, such as the Motorola 68HC11 series, can be connected to the

MCP809 RESET output. To ensure a correct output on the MCP809 even when the microprocessor reset pin is

in the opposite state, connect a 4.7k

Ω resistor between the MCP809 RESET output and the µP reset pin, as

shown in Figure 11. Buffer the MCP809 RESET output to other system components.

Figure 11. Interfacing to Microprocessors with Bidirectional Reset I/O

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