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

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CAT811

4-Pin Microprocessor Power Supply Supervisors with Manual Reset

Catalyst Semiconductor => Onsemi 

CAT811, CAT812

VALID RESET WITH VCC UNDER 1.0V

To ensure that the CAT811 R¯¯E¯S¯E¯T¯ pin is in a known

state when VCC is under 1.0V, a 100kΩ pull-down

resistor between R¯¯E¯S¯E¯T¯ 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

VCC

CAT811

MR RESET

GND

100kΩ

Power

Supply

VCC

CAT812

MR RESET

GND

100kΩ

Figure 3. R¯¯E¯S¯E¯T¯ Valid with VCC under 1.0V

Figure 4. RESET Valid with VCC under 1.1V

BI-DIRECTIONAL RESET PIN INTERFACING

The CAT811/812 can interface with µP/µC bi-

directional reset pins by connecting a 4.7kΩ resistor in

series with the CAT811/812 reset output and the

µP/µC bi-directional reset pin.

Power

Supply

BUF

Buffered

RESET

CAT811

MR RESET

GND

4.7kΩ

VCC

(for example: 68HC11)

µP

RESET

INPUCTAT811

GND

Bi-directional I/O Pin

Figure 5. Bi-directional Reset Pin Interfacing

© Catalyst Semiconductor, Inc.

7

Characteristics subject to change without notice

Doc. No. MD-3005 Rev. S

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