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20-Channel Serial-Input Vacuum-Fluorescent
Display Driver for Anode/Grid
Ordering Information
Package Options
Device 28 Pin Plastic DIP 28 Pin Plastic Chip Carrier SOW-28 Die
HV5812 HV5812P HV5812PJ HV5812WG HV5812X
HV5812
Features
❏ Operating voltage of to up to 80V
❏ HVCMOS
❏ High speed source driver
❏ Up to 3.3MHz data input rate
❏ 5.0V CMOS logic circuitry
❏ Excellent noise immunity
❏ Flexible high voltage supplies
Absolute Maximum Ratings
VDD logic power supply voltage -0.5V to +7.5V
VPP positive high voltage supply -0.5V to +90V
Logic input voltages -0.3V to VDD +0.3V
Operating junction temperature range -40°C to +150°C
Storage temperature -55°C to +150°C
Power dissipation 28-pin PLCC 1.9 Watt
Notes:
1. All voltages are referenced to ground. Absolute maximum ratings
are those values at 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.
technology for high performance
SOW-28 1.7 Watt
28-pin DIP 2.0 Watt
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General Description
The Supertex HV5812 is a 20-channel serial input vacuum
fluorescent display driver. It combines a 20-bit CMOS shift register, data latches, and control circuitry with high voltage MOSFET
outputs. The HV5812 is primarily designed for vacuum-fluorescent displays.
The CMOS shift register and latches allow direct interfacing with
microprocessor-based systems. Data input rates are typically
over 5.0MHz with 5V logic supply. Especially useful for inter-digit
blanking, the BLANKING input disables the output source drives
and turns on the sink drivers. Use with TTL may require external
pull-up resistors to ensure an input logic high.
11/12/01
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.
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Electrical Characteristics
HV5812
DC Characteristics (Over recommended operating conditions, T
= 25°C, unless otherwise noted)
A
Symbol Parameter Min Typ Max Units Conditions
I
DSS
HV
HV
HV
HV
I
SINK
V
V
I
IH
I
IL
V
V
f
CLK
IH
IL
OH
OL
Output leakage current -5.0 -15 µAV
Output voltage 78 78.5 V
OH
Output Voltage 77 78 V
OH
Output Voltage VDD = 5V 1.5 3.0 V I
OL
Output Voltage VDD = 5V 2.3 4.0 V I
OL
Output pull-down current VDD = 5V 2.0 3.5 mA V
Logic input voltage VDD = 5V 3.5 5.3 V
Logic input voltage -0.3 0.8 V
Logic input current VDD = 5V 0.05 0.5 µAVIN = V
Logic input current VDD = 5V -0.05 -0.5 µAVIN = 0.8V
Serial data out VDD = 5V 4.5 4.7 V I
Serial data out VDD = 5V 200 250 mV I
Maximum clock frequency VDD = 5V 8.0 MHz TJ = +25°C
= 0V, TA = +70°C
OUT
I
= -25mA, VPP = 80V
OUT
TA = +25°C
= -25mA, VPP = 80V
I
OUT
TA = +125°C
= 1.0mA, TA = +25°C
OUT
= 1.0mA, TA = +125°C
OUT
= 5.0V to V
OUT
DD
= -200µA
OUT
= 200µA
OUT
VDD = 5V 5.0 MHz TJ = +125°C
PP
I
DDQ
Supply current VDD = 5V 100 300 µA All outputs high
VDD = 5V 100 300 µA All outputs low
I
PPQ
Supply current 10 100 µA Outputs high, no Load
10 100 µA Outputs low, no Load
Recommended Operating Conditions
Symbol Parameter Min Nom Max Units
V
DD
V
PP
T
J
Power-up sequence should be the following:
1. Connect ground.
2. Apply V
3. Set all inputs (Data, CLK, etc.) to a known state.
4. Apply V
5. The V
Power-down sequence should be the reverse of the above.
.
DD
.
PP
should not drop below VDD or float during operation.
PP
Supply voltage 4.5 5.5 V
Supply voltage 20 80 V
Operating junction temperature -40 +125 °C
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HV5812
AC Characteristics (T
= 25°C, over operating conditions unless otherwise noted)
A
Symbol Parameter Min Typ Max Units Conditions
t
PHL
t
PLH
t
f
t
r
t
su
t
h
t
pwd
t
pwclk
t
cks
Blanking to output delay VDD = 5V 2000 ns CL = 30pF, 50% to 50%
Blanking to output delay VDD = 5V 1000 ns CL = 30pF, 50% to 50%
Output fall time VDD = 5V 1450 ns CL = 30pF, 90% to 10%
Output rise time VDD = 5V 650 ns CL = 30pF, 10% to 90%
Data set-up time 75 ns See timing diagram
Data hold time 75 ns See timing diagram
Minimum data pulse width 150 ns See timing diagram
Minimum clock pulse width 150 ns See timing diagram
Minimum time between clock activation 300 ns See timing diagram
and strobe
t
t
pws
sto
Minimum strobe pulse width 100 ns See timing diagram
Typical time between strobe activation 500 ns See timing diagram
and output transition
Input and Output Equivalent Circuits
V
DD
Input
GND
Logic Inputs
V
DD
GND
Logic Data Output
Data Out
GND
V
PP
L/T
High Voltage Outputs
HV
OUT
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Timing Diagram
CLK
Data In
Strobe
t
pwclk
50% 50%
t
su
t
pwd
t
h
t
cks
t
HV5812
pws
Blanking
HV
OUT
Block Diagram
Blanking
Strobe
V
DD
Data In
Clock
Data Out
20-bit
Shift
Register
20-bit
Latch
50%
t
PHL
t
sto
10%
90% 90%
t
r
50%
t
f
10%
HV
HV
HV
t
PLH
V
PP
1
OUT
2
OUT
3
OUT
HV
20
OUT
GND
Function Table
Serial Clock Shift Register Contents Serial Strobe Latch Content Blanking Output Content
Data Input Data Input
Input I1I2I3 ... I
HL to H H R1R2 ... R
LL to H L R1R2 ... R
XH to L R1R2R3 ... R
N-1IN
N-2RN-1
N-2RN-1
N-1RN
XX X ... X X X L R1R2R3 ... R
P1P2P3 ... P
Note:
L = Low Logic Level H = High Logic Level X = Irrelevant P= Present State R = Previous State
N-1PN
Output I1I2I3 ... I
R
N-1
R
N-1
R
N
P
N
HP1P2P3 ... P
XXX ... X X H L L L ... L L
4
N-1IN
N-1RN
N-1PN
I1I2I3 ... I
LP
1P2P3
... P
N-1IN
N-1PN
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HV5812
Pin Configuration
HV5812
28-pin PLCC, 28-pin DIP, and SOW-28
Pad Function
1V
2 Data Out
3HV
4HV
5HV
6HV
7HV
8HV
9HV
10 HV
11 HV
12 HV
13 Blank
14 GND
15 Clock
16 Strobe
17 HV
18 HV
19 HV
20 HV
21 HV
22 HV
23 HV
24 HV
25 HV
26 HV
27 Data In
28 V
PP
20
OUT
19
OUT
18
OUT
17
OUT
16
OUT
15
OUT
14
OUT
13
OUT
12
OUT
11
OUT
10
OUT
9
OUT
8
OUT
7
OUT
6
OUT
5
OUT
4
OUT
3
OUT
2
OUT
1
OUT
DD
Package Outlines
25
24 23 22 21 20
26
27
28
1
2
3
4
5
678910
top view
28-pin PLCC
1
2
3
4
5
6
7
8
9
10
11
12
13
14
19
18
17
16
15
14
13
12
11
28
27
26
25
24
23
22
21
20
19
18
17
16
15
top view
28-pin DIP and SOW-28
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©2001 Supertex Inc. All rights reserved. Unauthorized use or reproduction prohibited.
11/12/01
1235 Bordeaux Drive, Sunnyvale, CA 94089
TEL: (408) 744-0100 • FAX: (408) 222-4895
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www.supertex.com
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