CAT803 データシートの表示（PDF） - ON Semiconductor

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CAT803

3-Pin Microprocessor Power Supply Supervisors

ON Semiconductor 

CAT803, CAT809, CAT810

Valid RESET with VCC Under 1.0 V

To ensure that the CAT809 RESET pin is in a known state when VCC is under 1.0 V, a >10 kW pull−down resistor between

RESET pin and GND is recommended. For the CAT810, a pull−up resistor from RESET pin to VCC is needed.

Power

Supply

Power

Supply

VCC

CAT809

RESET

GND

10 kW

VCC

CAT810

RESET

GND

10 kW

Figure 8. RESET Valid with VCC Under 1.0 V

Figure 9. RESET Valid with VCC Under 1.1 V

Bi−directional Reset Pin Interfacing

The CAT809/810 can interface with mP/mC bi−directional reset pins by connecting a 4.7 kW resistor in series with the

CAT809/810 reset output and the mP/mC bi−directional reset pin.

Power

Supply

BUF

Buffered

RESET

VCC

CAT809

RESET

4.7 kW

GND

Bi−directional

I/O Pin

VCC

mP

RESET

INPUT

GND

(For example:

68HC11)

Figure 10. Bi−directional Reset Pin Interfacing

CAT803 Open−Drain RESET Application

The CAT803 features an open−drain RESET output and

therefore needs a pull−up resistor on the output for proper

operation, as shown on Figure 11. An advantage of the

open−drain output includes the ability to “wire AND”

several outputs together to form an inexpensive logic circuit.

It is also possible to have the pull−up resistor connected to

a different supply which can be higher than the CAT803 VCC

pin. The value of the pull−up resistor is not critical in most

applications, typical values being between 5 kW and 10 kW.

Power

Supply

VCC

CAT803

RESET

GND

5 kW

VCC

mP

RESET

INPUT

GND

Figure 11. Typical CAT803 Open−Drain

Circuit Configuration

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