Parallel Converter. HV57708 Datasheet
32MHz, 64-Channel Serial to Parallel Converter
with Push-Pull Outputs
►►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 VPP allows efficient power recovery
►►Outputs may be hot switched
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
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.
Functional Block Diagram
DO4 DO3 DO2 DO1
DI1 DI2 DI3 DI4
Each SR (shift register) provides 16 outputs. SR1 supplies every fourth output starting with 1;
SR2 supplies every fourth output with 2, etc.
-G denotes a lead (Pb)-free / RoHS compliant package
Absolute Maximum Ratings
Supply voltage, VDD
Output voltage , VPP
Logic input levels
Continuous total power dissipation2
-0.5V to +7.5V
-0.5V to +90V
-0.3V to VDD +0.3V
Operating temperature range
-40°C to +85°C
Storage temperature range
-65°C to +150°C
Absolute Maximum Ratings are those values beyond which damage to the
device may occur. Functional operation under these conditions is not implied.
Continuous operation of the device at the absolute rating level may affect
device reliability. All voltages are referenced to device ground.
1. Limited by the total power dissipated in the package.
2. For operation above 25°C ambient derate linearly to maximum
operating temperature at 20mW/°C.
L = Lot Number
YY = Year Sealed
WW = Week Sealed
C = Country of Origin
A = Assembler ID
= “Green” Packaging
Package may or may not include the following marks: Si or
Typical Thermal Resistance
Recommended Operating Conditions
VDD Logic supply voltage
VPP Output voltage
VIH High-level input voltage
VIL Low-level input voltage
fCLK Clock frequency per register
TA Operating free-air temperature
Power-up sequence should be the following:
1. Apply ground.
2. Apply VDD.
3. Set all inputs (DIN, CLK, Enable, etc.) to a known state.
4. Apply VPP.
5. The VPP should not drop below VDD or float during operation.
Power-down sequence should be the reverse of the above.