CAT812JTBI-T3 datasheet(7/11 Pages) CATALYST

Part #	CAT812JTBI-T3

Description	4-Pin Microprocessor Power Supply Supervisors with Manual Reset

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Manufacturer	CATALYST [Catalyst Semiconductor]

Direct Link	http://www.catalyst-semiconductor.com

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CAT811, CAT812

7

Doc. No. MD-3005 Rev. S

Characteristics subject to change without notice

VALID RESET WITH VCC UNDER 1.0V

To ensure that the CAT811 RESET

¯¯¯¯¯¯ pin is in a known

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

resistor

between

RESET

¯¯¯¯¯¯

and

GND

is

recommended; the value is not critical. For the

CAT812, a pull-up resistor from RESET pin to VCC is

needed.

Figure 3. RESET

¯¯¯¯¯¯ 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.

Figure 5. Bi-directional Reset Pin Interfacing

VCC

GND

100kΩ

CAT811

MR

RESET

Power

Supply

VCC

GND

100kΩ

CAT812

MR

RESET

Power

Supply

GND

4.7kΩ

CAT811

MR

GND

BUF

RESET

INPUT

RESET

Power

Supply

µP

(for example: 68HC11)

Buffered

Bi-directional I/O Pin

VCC

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CAT812JTBI-T3 Datasheet(PDF) 7 Page - Catalyst Semiconductor

CAT812JTBI-T3 Datasheet(HTML) 7 Page - Catalyst Semiconductor

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