___________________Chip Topography

TRANSISTOR COUNT = 380;

µP Power-Supply Monitor

with Reset

_______________________________________________________________________________________

5

4.7k

GND

RESET

MAX7705

RESET

GND

µP

BUFFER

BUFFERED RESET

TO OTHER SYSTEM

COMPONENTS

Figure 3. Interfacing to µPs with Bidirectional Reset I/O

Interfacing to µPs with

Bidirectional Reset Inputs

µPs with bidirectional reset pins, such as Motorola’s

68HC11 series, can contend with the MAX7705 reset

output. If, for example, the MAX7705

RESET output is

asserted high and the µP wants to pull it low, an inde-

terminate logic level may result. To correct this, con-

nect a 4.7k

Ω resistor between the MAX7705 RESET

output and the µP reset I/O, as in Figure 3. Buffer the

RESET signal to other system components.

RESET

GND

0.045"

(1.143mm)

0.056"

(1.422mm)