HV5812 datasheet(7/16 Pages) MICROCHIP

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 2016 Microchip Technology Inc.

DS20005629A-page 7

HV5812

3.0

FUNCTIONAL DESCRIPTION

Follow the steps below to power up and power down

the HV5812:

POWER-UP AND POWER-DOWN SEQUENCE

Power-up

Power-down

Step

Description

Step

Description

Connect ground.

Remove VPP.

Apply VDD.

Remove all inputs.

Set all inputs (Data, CLK, etc.) to a known state

Remove VDD.

Apply VPP. (Note 1)

Disconnect ground.

Note 1: The VPP should not drop below VDD during operation.

FUNCTION TABLE (Note 1)

Serial

Data

Input

Clock

Input

Shift Register Contents

Serial

Data

Output

Strobe

Input

Latch Contents

Blanking

Output Contents

I3... IN-1

I1 I2

I3... IN-1

L to H

R2...RN–2

RN–1

—

L to H

R2...RN–2

RN–1

—

H to L R1 R2

R3...RN–1

—

X...X

R1 R2

R3...RN–1

—

P1 P2

P3...PN–1

P1 P2

P3...PN–1

P1 P2

P3...PN–1

—

X...X

L...L

Note 1:

L = Low logic level



H = High logic level



X = Irrelevant



P = Present state



R = Previous state

VDD

INPUT

GND

VPP

L/T

GND

OUT

Logic Inputs

GND

Data Out

Logic Data Output

High Voltage Outputs

VDD

FIGURE 3-1:

IO Circuits.

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