Data Sheet
26182.126A
6812
A6812xA
LOAD
SUPPLY
SERIAL
DATA OUT
OUT
20
OUT
19
OUT
18
OUT
17
OUT
16
OUT
15
OUT
14
OUT
13
OUT
12
OUT
11
BLANKING
GROUND
1
3
4
5
6
V
BB
V
DD
28
27
26
25
24
23
LOGIC
SUPPLY
SERIAL
DATA IN
OUT
1
OUT
2
OUT
3
OUT
4
OUT
5
OUT
6
OUT
7
OUT
8
OUT
9
OUT
10
STROBE
CLOCK
DABiC-IV, 20-BIT SERIAL-INPUT,
LATCHED SOURCE DRIVER
The A6812鈥?devices combine a 20-bit CMOS shift register,
accompanying data latches and control circuitry with bipolar sourcing
outputs and pnp active pull downs. Designed primarily to drive
vacuum-fluorescent displays, the 60 V and -40 mA output ratings also
allow these devices to be used in many other peripheral power driver
applications. The A6812鈥?features an increased data input rate (com-
pared with the older UCN/UCQ5812-F) and a controlled output slew
rate.
The CMOS shift register and latches allow direct interfacing with
microprocessor-based systems. With a 3.3 V or 5 V logic supply, they
will operate to at least 10 MHz.
A CMOS serial data output permits cascade connections in applica-
tions requiring additional drive lines. Similar devices are available as
the A6809鈥?and A6810鈥?(10 bits), A6811鈥?(12 bits), and A6818鈥?(32
bits).
The A6812鈥?output source drivers are npn Darlingtons, capable of
sourcing up to 40 mA. The controlled output slew rate reduces electro-
magnetic noise, which is an important consideration in systems that
include telecommunications and/or microprocessors and to meet
government emissions regulations. For inter-digit blanking, all output
drivers can be disabled and all sink drivers turned on with a BLANK-
ING input high. The pnp active pull-downs will sink at least 2.5 mA.
Two temperature ranges are available for optimum performance in
commercial (suffix S-) or industrial (suffix E-) applications. Package
styles are provided for through-hole DIP (suffix -A), surface-mount
SOIC (suffix -LW), or minimum-area surface-mount PLCC (suffix
-EP). Copper lead frames, low logic-power dissipation, and low
output-saturation voltages allow these drivers to source 25 mA from all
outputs continuously to more than +43擄C (suffix -LW), +61擄C (suffix
-EP), or +77擄C (suffix -A).
REGISTER
REGISTER
LATCHES
LATCHES
7
8
9
10
11
12
13
14
BLNK
22
21
20
19
18
17
ST
CLK
28
16
27
15
Dwg. PP-029-7
ABSOLUTE MAXIMUM RATINGS
at T
A
= 25
擄
C
Logic Supply Voltage, V
DD
...................
7.0 V
Driver Supply Voltage, V
BB
...................
60 V
Continuous Output Current Range,
I
OUT
.........................
-40 mA to +15 mA
Input Voltage Range,
V
IN
.......................
-0.3 V to V
DD
+ 0.3 V
Package Power Dissipation,
P
D
........................................
See Graph
Operating Temperature Range, T
A
(Suffix 鈥楨鈥撯€? ..................
-40
擄
C to +85
擄
C
(Suffix 鈥楽鈥撯€? ..................
-20
擄
C to +85
擄
C
Storage Temperature Range,
T
S
...............................
-55
擄
C to +125
擄
C
Caution: These CMOS devices have input static
protection (Class 2) but are still susceptible to
damage if exposed to extremely high static
electrical charges.
FEATURES
I
Controlled Output Slew Rate
I
Low Output-Saturation Voltages
I
High-Speed Data Storage
I
Low-Power CMOS Logic
I
60 V Minimum
and Latches
Output Breakdown
I
Improved Replacements
I
High Data Input Rate
for TL5812鈥? UCN5812鈥?
I
PNP Active Pull-Downs
and UCQ5812鈥?/div>
Complete part number includes a suffix to identify operating
temperature range (E- or S-) and package type (-A, -EP, or -LW).
Always order by complete part number, e.g.,
A6812SLW
.
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