CAT811(2004) データシートの表示（PDF） - Catalyst Semiconductor => Onsemi

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CAT811
(Rev.:2004)

4-Pin Microprocessor Power Supply Supervisors

Catalyst Semiconductor => Onsemi 

CAT811, CAT812

VALID RESET WITH VCC UNDER 1.0 V

To ensure that the CAT811 RESET pin is in a known state when VCC is under 1.0 V, a 100 kΩ pull-down resistor

between RESET pin and GND is recommended; the value is not critical. For the CAT812, a pull-up resistor from

RESET pin to VCC is needed.

Power

Supply

Power

Supply

VCC

CAT811

RESET

GND

100kΩ

VCC

CAT812

RESET

GND

100kΩ

FIGURE 3. RESET Valid with VCC Under 1.0 V

FIGURE 4. RESET Valid with VCC Under 1.1 V

BI-DIRECTIONAL RESET PIN INTERFACING

The CAT811/812 can interface with µP/µC bi-directional reset pins by connecting a 4.7 kΩ resistor in series with the

CAT811/812 reset output and the µP/µC bi-directional reset pin.

Power

Supply

VCC

BUF

Buffered

RESET

CAT811

RESET

4.7kΩ

µP

RESET

INPUT

GND

GND

Bi-directional I/O Pin

(For example: 68HC11)

FIGURE 5. Bi-directional Reset Pin Interfacing

Doc. No. 3005, Rev. P

8

Patent Pending

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