HV633

1

32-Channel 128-Level Amplitude Gray-Shade

Display Column Driver

Features

❏ 5V CMOS inputs

❏ Up to 80V modulation voltage

❏ Capable of 128 levels of gray shading

❏ 24MHz data throughput rate

❏ 32 outputs per device (can be cascaded)

❏ Pin-programmable shift direction (DIR)

❏ D/A conversion cycle time is 20µs

❏ Diodes in output structure allow usage

in energy recovery systems

❏ Available in 3-sided 64-lead gullwing package

General Description

The HV633 is a 32-channel driver IC for gray shade display use.

It is designed to produce varying output voltages between 3 and

80 volts. This amplitude modulation at the output is facilitated by

an external ramp voltage V

explanation.

This device consists of a dual 16-bit shift registers, 32 data latches

and comparators, and control logic to preform 128 levels of gray

shading. There are 7 bits of data inputs. Data is shifted through the

shift registers at both edges of the clock, resulting a data transfer

rate of twice of the shift clock frequency. When the DIR pin is high,

CSI/CSO is the input/output for the chip select pulse. When DIR

is low, CSI/CSO is the output/input for the chip select pulse. The

DIR = HIGH also allows the HV633 to shift data in the counter-

clockwise direction when viewed from the top of the package.

When the DIR pin is low, data is shifted in the clockwise direction.

The output circuitry allows the energy which is stored in the output

capacitance to be returned to V

output transistor.

08/08/03rev.3

Supertex Inc. does not recommend the use of its products in life support applications and will not knowingly sell its products for use in such applications unless it receives an adequate "products liability

indemnification insurance agreement." Supertex does not assume responsibility for use of devices described and limits its liability to the replacement of devices determined to be defective due to

workmanship. No responsibility is assumed for possible omissions or inaccuracies. Circuitry and specifications are subject to change without notice. For the latest product specifications, refer to the

Supertex website: http://www.supertex.com. For complete liability information on all Supertex products, refer to the most current databook or to the Legal/Disclaimer page on the Supertex website.

HV633

Applications

❏ Electroluminescent Displays

❏ Polycholesteric Displays

Functional Block Diagram

32

Low Voltage

High Voltage

High Voltage

Power Supply

Low Voltage

Power Supply

Shift Register

Latches

Comparator

Counter

Source Follower

Output Buffer

SCI

SC

LC

CC

SCO

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