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Forward and reverse shifting options
General Description
The HV34 is a low voltage serial to high voltage parallel converter
with push-pull outputs. This device has been designed for use as
a printer driver for inkjet applications. It can also be used in any
application requiring multiple output high voltage, low current
sourcing and sinking capabilities.
The device consists of a 64-bit shift register, 64 latches, and
control logic to perform the polarity select and blanking of the
outputs. A DIR pin controls the direction of data shift through the
device. With DIR grounded, D
IOA
is Data-In and D
IOB
is Data-Out;
data is shifted from HV
OUT
64 to HV
OUT
1. When DIR is at logic high,
D
IOB
is Data-In and D
IOA
is Data-Out: data is then shifted from
HV
OUT
1 to HV
OUT
64. Data is shifted through the shift register on
the low to high transition of the clock. Data output buffers are
provided for cascading devices. 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 register to the latch
occurs when the LE (latch enable) is high. The data in the latch is
stored during LE transition from high to low.
Absolute Maximum Ratings
1
Supply voltage, V
DD
Supply voltage, V
PP
Logic input levels
Ground current
2
High voltage supply current
2
Continuous total power dissipation
3
Ceramic
Plastic
Operating temperature range
Storage temperature range
-0.5V to +15V
V
DD
to +200V
-0.5V to V
DD
+0.5V
1.5A
1.3A
1900mW
1200mW
Ceramic -55擄C to +125擄C
Plastic -40擄C to +85擄C
-65擄C to +150擄C
Notes:
1. All voltages are referenced to GND.
2. Connection to all power and ground pads is required. Duty cycle is limited by
the total power dissipated in the package.
3. For operation above 25擄C ambient derate linearly to maximum operating
temperature at 20mW/擄C for plastic and at 31.7mW/擄C for ceramic.
12/13/01
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
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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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