MAX705C データシートの表示（PDF） - Maxim Integrated

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MAX705C

Low-Cost, μP Supervisory Circuits

Maxim Integrated 

MAX705–MAX708/MAX813L

MAX705–MAX708/MAX813L

Low-Cost, μP Supervisory Circuits

MAX70_

RESET

R1

Figure 5. RESET Valid to Ground Circuit

+5V

R1

R2

VCC

MR

MAX70_

PFO

PFI

100kΩ

100kΩ

2N3904

RESET

GND

TO µP

V-

+5V

MR

0V

+5V

PFO

0V

V-

VTRIP

0V

5 – 1.25

R1

= 1.25 – VTRIP

R2

, VTRIP < 0

Figure 7. Monitoring a Negative Voltage

+12V +5V

1MΩ

1%

130kΩ

1%

VCC

RESET

MAX70_

MR

PFI

PFO

GND

TO µP

PARAMETER

+12V Reset

Threshold at +25°C

MIN TYP MAX UNIT

10.67 10.87 11.50 V

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

BUFFERED RESET TO OTHER SYSTEM COMPONENTS

VCC

MAX70_

RESET

4.7kΩ

VCC

µP

RESET

GND

GND

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

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.

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