HV4937
64-Channel Serial To Parallel Converter
With P-Channel Open Drain Outputs
Ordering Information
Package Options
Device
HV4937
80-Lead Quad
Plastic Gullwing
HV4937PG
Die
HV4937X
Features
s
HVCMOS
®
Technology
s
Output voltages up to -375V
s
Source current minimum 0.25mA
s
Shift register speed 6 MHz
s
Latched outputs
s
CMOS compatible inputs
s
Forward and reverse shifting options
General Description
Not recommended for new designs.
The HV49 is a low voltage serial to high voltage parallel converter
with open drain outputs. It has been designed especially for use
as a driver for electrostatic printers.
This device consists of a 64-bit shift register, 64 latches, a latch
enable (LE), and an output enable (OE). Data is shifted through
the shift register on the high to low transition of the clock. When
the DIR pin is set high, the HV49 shifts in the counterclockwise
direction when viewed from the top of the package. When the DIR
pin is set low, the HV49 shifts in the clockwise direction. A serial
data output buffer is provided for cascading devices. This output
reflects the current status of the last bit of the shift register.
Operation of the shift register is not affected by the LE or the OE
inputs. Transfer of data from the shift register to the latch occurs
when the LE input is high. The data in the latch is stored when LE
is low.
12
Absolute Maximum Ratings
1
Supply voltage, V
DD
Supply voltage, V
PP
Logic input levels
Ground current
Continuous total power dissipation
2
Operating temperature range
Storage temperature range
+0.5V to -9V
+0.5V to -400V
+0.5V to V
DD
-0.5V
0.75A
1200mW
-40°C to +85°C
-65°C to +150°C
Notes:
1. All voltages are referenced to V
SS
.
2. For operation above 25°C ambient derate linearly by 20mW/°C up to 85°C.
12-29
SUPERTEX [ Supertex, Inc ]
