Supertex inc.

Supertex inc.

1235 Bordeaux Drive, Sunnyvale, CA 94089

Tel: 408-222-8888

www.supertex.com

HV5408B

Features

General Description

The HV5408B is a low voltage serial to high voltage parallel

converter with push-pull outputs. This device has been designed

for use as a driver for AC-electroluminescent displays. It can also

be used in any application requiring multiple output high voltage

current sourcing and sinking capabilities, such as driving plasma

panels, vacuum fluorescent, or large matrix LCD displays.

The HV5408B consists of a 32-bit shift register, 32 latches, and

control logic to enable outputs. Q1 is connected to the first stage

of the shift register through the Output Enable logic. Data is shifted

through the shift register on the low to high transition of the clock.

When viewed from the top of the package, the HV5408B shifts in

the counter-clockwise direction. A data output buffer is provided

for cascading devices. This output reflects the current status of

the last bit of the shift register (32). Operation of the shift register

is not affected by the LE (latch enable) or the OE (output enable)

inputs. Transfer of data from the shift register to the latch occurs

when the LE input is high. The data in the latch is retained when

LE is low.

Typical Application Circuit

32-Channel Serial to Parallel Converter

With High Voltage Push-Pull Outputs

DATA

INPUT

CLK

LE

OE

HV

Micro

Processor

Supertex HV5408B

Display

Panel

Columns

Row

Driver

HV

Data Input for cascading the next HV5408B

DATA

OUT

Low Voltage

High Voltage

Shift Register

Latches

Output Contr.

Level

Translators

&

Push-Pull

Output

Buffers

VPP

VDD