1
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
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.
1
2
3
4
8
7
6
5
Device
HV
IN
Maximum Voltage
Package Options
SO-8
HV508
45V
HV508LG
HV508
High Voltage Liquid Crystal
Shutter Driver
Ordering Information
General Description
The Supertex HV508 is a 45V liquid crystal shutter driver in an SO-
8 surface mount package. It consist of two outputs that provide
square waves of opposite phase. The liquid crystal shutter is
connected between the two outputs. Its equivalent load can be
approximated as a resistor in parallel with a capacitor. Minimum
resistance is 1.0M and maximum capacitance is 0.1F.
The HV508 has three input supply voltages, HV
IN
, LV
IN
, and V
DD
.
The output's amplitude will be either LV
IN
or HV
IN
. A logic high on
the HV
EN
input will set the output to operate from the HV
IN
supply.
A logic low on the HV
EN
input will set the output to operate from the
LV
IN
supply. The output frequency is set by the logic input fre-
quency applied on the POL input.
Features
HVCMOS
technology for high performance
Logic-selectable output voltage
100nF drive capability
Up to 90V
P-P
25s response time
Absolute Maximum* Ratings
HV
IN
, high voltage input
+60V
LV
IN
, low voltage input
+7.5V
V
DD
, logic supply voltage
+12V
Continuous total power dissipation
700mW
Operating temperature
-5C to +60C
Storage temperature
65C to +150C
Soldering temperature
+300C
* All voltages are referenced to GND.
For operation above 25C ambient derate linearly at 6mW/C.
Pin Configuration
LV
IN
HV
OUT1
POL
HV
IN
HV
EN
V
DD
GND
HV
OUT2
top view
SO-8
2
DC Electrical Characteristics
(over operating supply voltages unless otherwise specified, T
A
= -5C to +60C)
Symbol
Parameter
Min
Typ
Max
Unit
Conditions
I
HVQ
HV
IN
quiescent current
10
A
I
LVQ
LV
IN
quiescent current
10
A
I
DDQ
V
DD
quiescent current
10
A
I
HV
HV
IN
operating current
2.8
mA
POL = 100Hz, HV
EN
= high,
T
A
= 25C, Load = 1M in parallel
with 0.1F between HV
OUT1
and
HV
OUT2
I
LV
LV
IN
operating current
380
A
POL = 100Hz, HV
EN
= low,
T
A
= 25C, Load = 1M in parallel
with 0.1F between HV
OUT1
and
HV
OUT2
I
IL
Logic input current low
-5
A
I
IH
Logic input current high
5.0
A
C
LOAD
Output capacitive load*
0
0.25
F
C
LOAD
in parallel with a 1M resistor
Electrical Characteristics
*The device can operate continuously without any damage within this range. AC limits are not implemented.
HV508
AC Electrical Characteristics
(HV
IN
= 45V, LV
IN
= 6V, V
DD
= 5V, T
A
= -5C to +60C)
Symbol
Parameter
Min
Typ
Max
Unit
Conditions
f
POL
POL input frequency
0
100
Hz
t
HV(ON)
Turn-on time when high voltage is enable
16
s
Load = 1M in parallel with 0.1F
between HV
OUT1
and HV
OUT2
.
t
HV(OFF)
Turn-off time when high voltage is enabled
16
s
HV
EN
= High. Outputs rise to HV
IN
.
See Fig. 1.
t
LV(ON)
Turn-on time when high voltage is disabled
40
s
Load = 1M in parallel with 0.1F
between HV
OUT1
and HV
OUT2
.
t
LV(OFF)
Turn-off time when high voltage is disabled
6.0
s
HV
EN
= Low. Outputs rise to LV
IN
.
See Fig. 1.
t
EN(ON)
Turn-on time from HV
EN
to HV
OUT
25
s
Load = 1M in parallel with 0.1F
between HV
OUT1
and HV
OUT2
.
See Fig. 2.
Symbol
Parameter
Min
Typ
Max
Unit
V
DD
Logic supply voltage
5.0
10.0
V
LV
IN
Low output supply voltage
3.0
6.0
V
HV
IN
High output supply voltage
5.0
45
V
V
IL
Logic input voltage low
0
0.3V
DD
V
V
IH
Logic input voltage high
0.7V
DD
V
DD
V
T
A
Ambient Temperature
-5.0
+60
C
Recommended Operating Conditions
Notes:
Power-up sequence should be the following:
1. Connect GND, V
DD
, logic inputs, HV
IN
, and LV
IN
.
Power-down sequence should be the reverse of the above.
3
1235 Bordeaux Drive, Sunnyvale, CA 94089
TEL: (408) 744-0100 FAX: (408) 222-4895
www.supertex.com
12/13/010
2001 Supertex Inc. All rights reserved. Unauthorized use or reproduction prohibited.
HV508
Timing Diagram
Block Diagram
LV
IN
HV
IN
V
DD
HV
EN
POL
GND
CMOS
Logic
Level
Translator
Level
Translator
Level
Translator
Level
Translator
HV
OUT
1
HV
OUT
2
GND
50%
80%
5%
50%
t
(OFF)
t
(ON)
POL
HV
OUT1
V
IL
V
IH
V
IN
or LV
IN
Figure 1
LV
IN
50%
80%
t
EN(ON)
HV
EN
HV
OUT1
V
IL
V
IH
HV
IN
Figure 2
Truth Table
HV
EN
POL
HV
OUT1
HV
OUT2
H
H
HV
IN
GND
H
L
GND
HV
IN
L
H
LV
IN
GND
L
L
GND
LV
IN
PDF 
ZIP