6818
A6818xA
LOAD
SUPPLY
SERIAL
DATA OUT
OUT
32
OUT
31
OUT
30
OUT
29
OUT
28
OUT
27
OUT
26
OUT
25
OUT
24
OUT
23
OUT
22
OUT
21
OUT
20
OUT
19
OUT
18
OUT
17
BLANKING
GROUND
1
2
3
4
5
6
7
8
9
REGISTER
REGISTER
LATCHES
LATCHES
DABiC-IV, 32-BIT SERIAL-INPUT,
LATCHED SOURCE DRIVER
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
OUT
11
OUT
12
OUT
13
OUT
14
OUT
15
OUT
16
STROBE
CLOCK
V
BB
V
DD
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
24
23
The A6818鈥?devices combine a 32-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 A6818鈥?features an increased data input rate (com-
pared with the older UCN/UCQ5818鈥揊) 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,
typical serial-data input rates are up to 33 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 A6812鈥?(20
bits).
The A6818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) or minimum-area
surface-mount PLCC (suffix -EP). Copper lead frames, low logic-
power dissipation, and low output-saturation voltages allow these
devices to drive most multiplexed vacuum-fluorescent displays over
the maximum operating temperature range.
Data Sheet
26182.128A
10
11
12
13
14
15
16
17
18
19
20
BLNK
ST
CLK
22
21
Dwg. PP-029-4
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
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 SN75518N, SN75518NF,
I
PNP Active Pull-Downs
UCN5818鈥? and UCQ5818鈥?/div>
Complete part number includes a suffix to identify operating
temperature range (E- or S-) and package type (-A or -EP). Always
order by complete part number, e.g.,
A6818SEP
.
Caution: These CMOS devices have input
static protection (Class 2) but are still
susceptible to damage if exposed to
extremely high static electrical charges.
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5
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