HV633
HV633
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
❏
Integrated HVCMOS
®
technology
❏
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
R
. See Theory of Operation for detailed
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
PP
through the body diode of the
output transistor.
Applications
❏
Electroluminescent Displays
❏
Polycholesteric Displays
Functional Block Diagram
Low Voltage
Power Supply
V
RAMP
High Voltage
Power Supply
SCI
SC
Low Voltage
High Voltage
HV
OUT
1
LC
CC
Shift Register
Latches
Comparator
Counter
32
Source Follower
Output Buffer
~
~
HV
OUT
32
SCO
I
BIAS
Control
V
CTL
R
CTL
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
1
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.
SUPERTEX [ Supertex, Inc ]
