HV57009
64-Channel Serial to Parallel Converter
with P-Channel Open Drain Controllable Output Current
Features
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HVCMOS
®
technology
5.0V CMOS Logic
Output voltage up to -85V
Output current source control
16MHz equivalent data rate
Latched data outputs
Foreward and reverse shifting options (DIR pin)
Diode to VDD allows efficient power recovery
General Description
The HV570 is a low-voltage serial to high-voltage parallel
converter with P-channel open drain outputs. This device
has been designed for use as a driver for plasma panels.
The device has two parallel 32-bit shift registers, permitting
data rates twice the speed of one (they are clocked together).
There are also 64 latches and control logic to perform the
blanking of the outputs. HV
OUT
1 is connected to the first stage
of the first shift register through the 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 V
SS
, and CW shifting when connected to
V
DD
. A data output buffer is provided for cascading devices.
This output reflects the current status of the last bit of the
shift register (HV
OUT
64). Operation of the shift register is
not affected by the LE (latch enable), or the BL (blanking)
inputs. Transfer of data from the shift registers to latches
occurs when the LE input is high. The data in the latches is
stored when LE is low.
The HV570 has 64 channels of output constant current
sourcing capability. They are adjustable from 0.1 to 2.0mA
through one external resistor or a current source.
Functional Block Diagram
DI/O2A
DI/O1A
LE
BL
DD
I/O
DIR
CLK
Latch
SR1
Latch
HVOUT1
HVOUT2
HVOUT3
•
•
•
HVOUT32
HVOUT33
HVOUT34
HVOUT35
•
•
•
HVOUT64
Latch
SR2
Latch
I/O
DI/O2B
DI/O1B
Programmable
Current
VSS
VBP +IN
-IN
Note:
Each SR (shift register) provides 32 outputs. SR1 supplies outputs 1 to 32 and SR2 supplies outputs 33 to 64.
SUPERTEX [ Supertex, Inc ]
