HV57708

Features

5.0V CMS Logic

Output voltage up to +80V

Low power level shifting

32MHz equivalent data rate

Latched data outputs

Foreward and reverse shifting options (DIR pin)

Diode to V

Outputs may be hot switched

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Functional Block Diagram

32MHz, 64-Channel Serial to Parallel Converter

with Push-Pull Outputs

General Description

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. 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.

HV

3

7

11

•

•

•

HV

63

HV

4

8

12

•

•

•

HV

64

HV

2

6

10

•

•

•

HV

62

HV

1

5

9

•

•

•

HV

61

POL

PP

V

OUT

BL

D 4

OUT

OUT

OUT

OUT

OUT

OUT

OUT

LE

I

D 4

O

SR4

SR3

SR2

SR1

CLK

DIR

GND

DD

V

D 3

O

D 2

O

D 1

O

D 3

I

D 2

I

D 1

I

D 1

O

D 2

O

D 3

O

D 4

O

D 1

I

D 2

I

D 3

I

D 4

I

Note:

Each SR (shift register) provides 16 outputs. SR1 supplies every fourth output starting with 1; SR2 supplies every fourth output with 2, etc.

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 current sourcing and sinking capability such

as driving plasma panels, vacuum fluorescent displays, or

large matrix LCD displays.