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參數(shù)資料
| 型號： | 6817 |
| 廠商： | Allegro MicroSystems, Inc. |
| 英文描述： | ADDRESSABLE 28-LINE DECODER/DRIVER |
| 中文描述： | 尋址28線譯碼器/驅(qū)動器 |
| 文件頁數(shù)： | 5/8頁 |
| 文件大?。?/td> | 70K |
| 代理商： | 6817 |
6817
ADDRESSABLE
28-LINE
DECODER/DRIVER
APPLICATIONS INFORMATION
This device is intended specifically for, although
certainly not limited to, driving ink-jet print heads. In
this application, a certain minimum energy (a function
of load voltage and output pulse duration) is required
for proper operation, while excessive energy will
degrade the life of the print head. The output pulse
duration (t
OUT
) is equal to t
ENABLE
+ t
PLH
– t
PHL
, where
t
PHL
is adjusted during manufacture to compensate for
variations in the output saturation voltage (V
CE(SAT)
).
For the A6817SEP, the relationship between t
OUT
and t
ENABLE
at T
A
= 25
°
C is:
t
OUT
= t
ENABLE
([V
CE(SAT)
(actual) – V
CE(SAT)
(typical)]
x
330 ns) + 25 ns + 110 ns.
For most applications, this will result in a driver-
contribution-to-energy-error of less than
±
4%.
A logic low on the CHIP ENABLE input will
prevent the drivers from turning ON, regardless of the
state of other inputs or the logic
supply voltage. The
CHIP ENABLE input has a slow response time and
should not be used as a high-speed control line. For
proper operation, all ground terminals should be
connected to a common ground on the printed wiring
board. The IC (Internal Connection) terminals are
used to program the turn-on time of the device and
MUST
be left electrically unconnected (floating) for
proper operation.
DECODER TRUTH TABLE
IN
D
(MSB)
IN
C
IN
B
IN
A
(LSB)
N
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
2
3
4
5
6
7
8
9
10
11
12
13
ALL OFF
ALL OFF
Depending on the four address inputs, the 4-to-14 line
decoder selects one driver from each of the 14 output A
and B banks of sink drivers according to the Decoder
Truth Table. The state of the selected outputs is deter-
mined by the OUTPUT ENABLE inputs as shown in the
Enable Truth Table.
CHIP
ENABLE
OUTPUT
ENABLE
A
OUTPUT
ENABLE
B
OUTPUTS (OFF unless otherwise specified.
For the value of N see the Decoder Truth Table)
0
X
X
ALL OFF
1
1
1
ALL OFF
1
0
1
OUT
AN
ON
OUT
BN
ON
OUT
AN
ON, OUT
BN
ON
1
1
0
1
0
0
X = Irrelevant
ENABLE TRUTH TABLE
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