HV5812

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

Features General Description

❏ Operating voltage of to up to 80V The Supertex HV5812 is a 20-channel serial input vacuum
fluorescent display driver. It combines a 20-bit CMOS shift regis-
❏ HVCMOS technology for high performance ter, data latches, and control circuitry with high voltage MOSFET
❏ High speed source driver outputs. The HV5812 is primarily designed for vacuum-fluores-
cent displays.
❏ Up to 3.3MHz data input rate
The CMOS shift register and latches allow direct interfacing with
❏ 5.0V CMOS logic circuitry microprocessor-based systems. Data input rates are typically
❏ Excellent noise immunity over 5.0MHz with 5V logic supply. Especially useful for inter-digit
blanking, the BLANKING input disables the output source drives
❏ Flexible high voltage supplies
and turns on the sink drivers. Use with TTL may require external
pull-up resistors to ensure an input logic high.

Absolute Maximum Ratings1

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
SOW-28 1.7 Watt
28-pin DIP 2.0 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.

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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 HV5812

Electrical Characteristics
DC Characteristics (Over recommended operating conditions, TA = 25°C, unless otherwise noted)

Symbol Parameter Min Typ Max Units Conditions

IDSS Output leakage current -5.0 -15 µA VOUT = 0V, TA = +70°C
IOUT = -25mA, VPP = 80V
HVOH Output voltage 78 78.5 V
TA = +25°C
IOUT = -25mA, VPP = 80V
HVOH Output Voltage 77 78 V
TA = +125°C
HVOL Output Voltage VDD = 5V 1.5 3.0 V IOUT = 1.0mA, TA = +25°C
HVOL Output Voltage VDD = 5V 2.3 4.0 V IOUT = 1.0mA, TA = +125°C
ISINK Output pull-down current VDD = 5V 2.0 3.5 mA VOUT = 5.0V to VPP
VIH Logic input voltage VDD = 5V 3.5 5.3 V
VIL Logic input voltage -0.3 0.8 V
IIH Logic input current VDD = 5V 0.05 0.5 µA VIN = VDD
IIL Logic input current VDD = 5V -0.05 -0.5 µA VIN = 0.8V
VOH Serial data out VDD = 5V 4.5 4.7 V IOUT = -200µA
VOL Serial data out VDD = 5V 200 250 mV IOUT = 200µA
fCLK Maximum clock frequency VDD = 5V 8.0 MHz TJ = +25°C
VDD = 5V 5.0 MHz TJ = +125°C

IDDQ Supply current VDD = 5V 100 300 µA All outputs high

VDD = 5V 100 300 µA All outputs low
IPPQ 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
VDD Supply voltage 4.5 5.5 V
VPP Supply voltage 20 80 V
TJ Operating junction temperature -40 +125 °C
Power-up sequence should be the following:
1. Connect ground.
2. Apply VDD.
3. Set all inputs (Data, CLK, 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.

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 HV5812

AC Characteristics (TA = 25°C, over operating conditions unless otherwise noted)

Symbol Parameter Min Typ Max Units Conditions

tPHL Blanking to output delay VDD = 5V 2000 ns CL = 30pF, 50% to 50%

tPLH Blanking to output delay VDD = 5V 1000 ns CL = 30pF, 50% to 50%

tf Output fall time VDD = 5V 1450 ns CL = 30pF, 90% to 10%

tr Output rise time VDD = 5V 650 ns CL = 30pF, 10% to 90%

tsu Data set-up time 75 ns See timing diagram

th Data hold time 75 ns See timing diagram

tpwd Minimum data pulse width 150 ns See timing diagram

tpwclk Minimum clock pulse width 150 ns See timing diagram

tcks Minimum time between clock activation 300 ns See timing diagram
and strobe

tpws Minimum strobe pulse width 100 ns See timing diagram

tsto Typical time between strobe activation 500 ns See timing diagram
and output transition

Input and Output Equivalent Circuits

VPP
VDD VDD

L/T

Input Data Out HVOUT

GND GND GND

Logic Inputs Logic Data Output High Voltage Outputs

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 HV5812

Timing Diagram
tpwclk

CLK 50% 50%

tsu

Data In
tpwd

th
tpws

tcks
Strobe

Blanking 50%

tPHL tPLH
tsto
HV OUT 90% 90% 50%
10% 10%

tr tf

Block Diagram
Blanking
Strobe VPP
VDD
HVOUT1

HVOUT2

Data In HVOUT3
Clock

Data Out 20-bit

Shift 20-bit
Register Latch

HVOUT20
GND

Function Table
Serial Clock Shift Register Contents Serial Strobe Latch Content Blanking Output Content
Data Input Data Input
Input I1 I2 I3 ... IN-1 IN Output I1 I2 I3 ... IN-1 IN I1 I2 I3 ... IN-1 IN
H L to H H R1 R2 ... RN-2 RN-1 RN-1
L L to H L R1 R2 ... RN-2 RN-1 RN-1
X H to L R1 R2 R3 ... RN-1 RN RN
X X X ... X X X L R1 R2 R3 ... RN-1 RN
P1 P2 P3 ... PN-1 PN PN H P1 P2 P3 ... PN-1 PN L P1 P2 P3 ... PN-1 PN
X X X ... X X H L L L ... L L
Note:
L = Low Logic Level H = High Logic Level X = Irrelevant P= Present State R = Previous State

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 HV5812

Pin Configuration Package Outlines

HV5812 25 24 23 22 21 20 19
28-pin PLCC, 28-pin DIP, and SOW-28
26 18
Pad Function
1 VPP 27 17

2 Data Out
28 16
3 HVOUT20
4 HVOUT19 1 15
5 HVOUT18
2 14
6 HVOUT17
7 HVOUT16 3 13
8 HVOUT15
4 12
9 HVOUT14
10 HVOUT13 5 6 7 8 9 10 11
11 HVOUT12
12 HVOUT11
top view
28-pin PLCC
13 Blank
14 GND
15 Clock
16 Strobe
17 HVOUT10
18 HVOUT9 1 28
19 HVOUT8 2 27
20 HVOUT7 3 26
21 HVOUT6
4 25
22 HVOUT5
5 24
23 HVOUT4
24 HVOUT3 6 23
25 HVOUT2 7 22
26 HVOUT1 8 21
27 Data In
9 20
28 VDD
10 19
11 18
12 17
13 16
14 15
top view
28-pin DIP and SOW-28

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 11/12/01

1235 Bordeaux Drive, Sunnyvale, CA 94089

TEL: (408) 744-0100 • FAX: (408) 222-4895
©2001 Supertex Inc. All rights reserved. Unauthorized use or reproduction prohibited.
6 www.supertex.com
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