HV57908

Features

5V CMS Logic

Output voltage up to +80V

Low power level shifting

8MHz data rate

Latched data outputs

Forward and reverse shifting options (DIR pin)

Diode to V

Outputs may be hot switched

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Functional Block Diagram

8MHz, 64-Channel Serial to Parallel Converter

with Push-Pull Outputs

General Description

The HV57908 is a low voltage serial to high voltage

parallel converter with push-pull outputs. The device has

been designed for use as a driver for EL displays. It can

also be used in any application requiring multiple output

high voltage current sourcing and sinking capability such

as driving plasma panels, vacuum fluorescent displays, or

large matrix LCD displays.

The device consists of a 64-bit shift register, 64 latches and

control logic to perform the polarity select and blanking of

the outputs. HVOUT1 is connected to the first stage of the

first shift register through the polarity and blanking logic.

Data is shifted through the shift registers on the logic low

to high transition of the clock. The DIR pin causes CCW

shifting when connected to GND, and CW shifting when

connected to VDD. A data output buffer is provided for

cascading devices. This output reflects the current status

of the last bit of the shift register (HVOUT64). Operation

of the shift register is not affected by the LE (latch enable),

BL (blanking), or the POL (polarity) inputs. Transfer of data

from the shift registers to the latches occurs when the LE

input is high. The data in the latches is stored when the LE

is low.

HVOUT2

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60 Additional

Outputs

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POL

BL

LE

Clock

64-bit

Static Shift

Register

64 Latches

HVOUT63

VPP

HVOUT1

DIR

HVOUT64

DIOB

DIOA