Supertex inc.

Supertex inc.

www.supertex.com

HV57708

Doc.# DSFP-HV57708

A061913

Features

Functional Block Diagram

32MHz, 64-Channel Serial to Parallel Converter

with Push-Pull Outputs

current sourcing and sinking capability such as driving

plasma panels, vacuum fluorescent displays, or large matrix

LCD displays.

The device has 4 parallel 16-bit registers, permitting data

rates 4x the speed of one (they are clocked together). There

are also 64 latches and control logic to perform the polarity

select and blanking of the outputs. HV

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 (HV

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.

HV

5

9

•

•

•

HV

POL

VPP

BL

D

LE

D

SR4

SR3

SR2

SR1

CLK

DIR

GND

VDD

D

D

D

D

Note:

Each SR (shift register) provides 16 outputs. SR1 supplies every fourth output starting with 1;

SR2 supplies every fourth output with 2, etc.

HV

6

10

•

•

•

HV

HV

7

11

•

•

•

HV

HV

8

12

•

•

•

HV

General Description

The HV57708 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