HV514
HV514
8-Channel Serial to Parallel Converter
with High Voltage Push-Pull Outputs
Features
❏
HVCMOS‚ technology
❏
Operating output voltage of 250V
❏
Low power level shifting from 5V to 250V
❏
Shift clock speed 8MHz @ V
DD
=5V
❏
8 latch data outputs
❏
Output blanking
❏
CMOS compatible inputs
❏
Programmable POL latch
General Description
The HV514 is a low voltage serial to high voltage parallel
converter with 8 high voltage push-pull outputs. This device has
been designed to drive small capacitve loads such as piezoelec-
tric transducers. It can also be used in any application requiring
multiple high voltage outputs, medium current sourcing and
sinking capabilities.
The device consists of an 8-bit shift register, dual 8-bit latches,
and control logic to latch data, and control blanking of the
outputs. Data is shifted through the shift register on the rising
transition of the clock. A data output buffer is provided for
cascading devices. Operation of the shift register is not affected
by the /LE, SEL, or the /BL inputs. Transfer of data from the shift
register to the latch occurs when the /LE is high. Shift register
data is shifted to the 8-bit Data Latch when SEL is high; and shift
register data is shifted to the 8-bit Polarity Latch when SEL is low.
The data is held in the output latches whenever /LE is low.
The high voltage output state is primarily dependent on the value
in the polarity latch. If the blank, /BL, is low, the output condition
is the result of a 1 being exclusively-NOR’ed with the polarity
latch value. If /BL is high, the output condition is the result of the
data latch being exclusively-NOR’ed with the polarity latch.
All outputs with have a break-before-make circuitry to reduce
cross-over current during output state changes.
Applications
❏
Piezoelectric transducer driver
❏
Weaving applications
❏
Braille
❏
Printers
❏
MEMs
❏
Displays
Top Block Diagram
V
DD
V
PP
Note: /LE, SEL, and /BL have internal 20k-ohm pull-up resistors.
8-bit shift register
Level translator
Output control
2 x 8-bit latch
D
IN
CLK
D
OUT
HV
OUT
1
8
8
8
•
•
•
•
•
•
HV
OUT
8
GND
LE*
BL*
SEL
01/19/04
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.
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SUPERTEX [ Supertex, Inc ]
