Datasheet

MAX709
Power-Supply Monitor with Reset
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Interfacing to µPs with
Bidirectional Reset Pins
Microprocessors with bidirectional reset pins (such as
the Motorola 68HC11 series) can contend with the
MAX709 reset output. If, for example the MAX709
RESET output is asserted high and the µP wants to pull
it low, indeterminate logic levels may result. To correct
this, connect a 4.7kΩ resistor between the MAX709
RESET output and the µP reset I/O (see Figure 3).
Buffer the MAX709 RESET output to other system com-
ponents.
R1
V
CC
GND
MAX709
RESET
Figure 2. RESET Valid to V
CC
= Ground Circuit
4.7k
V
CC
GND
RESET
MAX709
V
CC
GND
µP
BUFFER
BUFFERED RESET
TO OTHER SYSTEM
COMPONENTS
RESET
Figure 3. Interfacing to µPs with Bidirectional Reset I/O