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6818

更新时间： 2024-09-17 22:19:59
品牌 Logo 应用领域
急速微 - ALLEGRO 驱动器输入元件
页数 文件大小 规格书
8页 143K
描述
DABiC-IV, 32-BIT SERIAL-INPUT, LATCHED SOURCE DRIVER

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6818 数据手册

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6818  
DABiC-IV, 32-BIT SERIAL-INPUT,  
LATCHED SOURCE DRIVER  
The A6818– 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– features an increased data input rate (com-  
pared with the older UCN/UCQ5818–F) and a controlled output slew  
rate.  
A6818xA  
LOGIC  
SUPPLY  
LOAD  
SUPPLY  
40  
39  
1
2
3
4
5
6
V
V
DD  
BB  
SERIAL  
DATA IN  
SERIAL  
DATA OUT  
38 OUT  
37 OUT  
36 OUT  
35 OUT  
OUT  
32  
1
2
3
4
5
OUT  
31  
OUT  
30  
OUT  
29  
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.  
OUT  
28  
34  
33  
32  
31  
30  
OUT  
OUT  
OUT  
OUT  
OUT  
7
8
OUT  
27  
6
7
8
OUT  
26  
9
A CMOS serial data output permits cascade connections in applica-  
tions requiring additional drive lines. Similar devices are available as  
the A6809– and A6810– (10 bits), A6811– (12 bits), and A6812– (20  
bits).  
10  
11  
12  
13  
14  
OUT  
25  
OUT  
24  
9
29 OUT  
28 OUT  
27 OUT  
26 OUT  
OUT  
OUT  
10  
11  
12  
13  
23  
22  
The A6818– 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.  
OUT  
OUT  
OUT  
OUT  
OUT  
21  
20  
19  
18  
17  
15  
16  
25  
24  
23  
22  
OUT  
OUT  
OUT  
14  
15  
16  
17  
18  
BLANKING 19 BLNK  
20  
STROBE  
ST  
21 CLOCK  
GROUND  
CLK  
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.  
Dwg. PP-029-4  
ABSOLUTE MAXIMUM RATINGS  
at TA = 25°C  
Logic Supply Voltage, VDD ................... 7.0 V  
Driver Supply Voltage, VBB ................... 60 V  
Continuous Output Current Range,  
IOUT ......................... -40 mA to +15 mA  
Input Voltage Range,  
VIN ....................... -0.3 V to VDD + 0.3 V  
Package Power Dissipation,  
FEATURES  
I Controlled Output Slew Rate  
I High-Speed Data Storage  
I 60 V Minimum  
Output Breakdown  
I High Data Input Rate  
I PNP Active Pull-Downs  
I Low Output-Saturation Voltages  
I Low-Power CMOS Logic  
and Latches  
I Improved Replacements  
for SN75518N, SN75518NF,  
UCN5818–, and UCQ5818–  
PD ........................................ See Graph  
Operating Temperature Range, TA  
(Suffix ‘E–’) .................. -40°C to +85°C  
(Suffix ‘S–’) .................. -20°C to +85°C  
Storage Temperature Range,  
TS ............................... -55°C to +125°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.  
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 .  
12345678

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