MAX705-MAX813L

Low-Cost, µP Supervisory Circuit

www.artschip.com

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Figure 7. Monitoring a Negative Voltage

Figure 6. Monitoring Both +5V and +12V

Figure 8. Interfacing to µPs with Bidirectional Reset I/O

Interfacing to µPs with

Bidirectional Reset Pins

µPs with bidirectional reset pins, such as the Motorola 68HC11

series, can contend with the MAX705-MAX708 RESET output.

If, for example, the RESET output is driven high and the µP

wants to pull it low, indeterminate logic levels may result. To

correct this, connect a 4.7kΩ resistor between the RESET

output and the µP reset I/O, as in Figure 8. Buffer the RESET

output to other system components.