MAX705CSA(1995) データシートの表示（PDF） - Maxim Integrated

部品番号

コンポーネント説明

メーカー

MAX705CSA
(Rev.:1995)

Low-Cost, μP Supervisory Circuits

Maxim Integrated 

Low-Cost, µP Supervisory Circuits

MAX70_

RESET

R1

+12V

+5V

1M

VCC

RESET

1%

MAX70_

MR

130k

1%

PFI

PFO

GND

TO µP

PARAMETER MIN TYP MAX UNIT

+12V Reset

10.67 10.87 11.50 V

Threshold at +25°C

Figure 5. RESET Valid to Ground Circuit

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

+5V

R1

R2

VCC

MR

MAX70_

100k

PFO

PFI

100k

2N3904

RESET

GND

TO µP

BUFFERED RESET TO OTHER SYSTEM COMPONENTS

VCC

MAX70_

4.7k

RESET

VCC

µP

RESET

V-

+5V

MR

0V

+5V

PFO

0V

V-

VTRIP

0V

5 − 1.25 = 1.25 − VTRIP , VTRIP < 0

R1

R2

Figure 7. Monitoring a Negative Voltage

GND

GND

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.

8 _______________________________________________________________________________________

Share Link: