CAT811S 데이터 시트보기 (PDF) - Catalyst Semiconductor => Onsemi

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CAT811S

4-Pin Microprocessor Power Supply Supervisors with Manual Reset

Catalyst Semiconductor => Onsemi 

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

MR

RESET

GND

100kΩ

CAT811, CAT812

VCC

CAT812

MR

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

4.7kΩ

µP

MR

RESET

RESET

INPUT

GND

Bi-directional

I/O Pin

GND

(For example: 68HC11)

Figure 5. Bi-directional Reset Pin Interfacing

© 2005 by Catalyst Semiconductor, Inc.

Characteristics subject to change without notice

7

Doc No. 3005, Rev. R

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