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IC BLOCK DIAGRAM & DESCRIPTION
IC841 BU2099FV(Output Expander)
V
1
SS
NC
2
DATA
3
CLOCK
4
LCK
5
Q0
6
Q1
7
Q2
8
Q3
9
Q4
10
No.
1
2
3
4
CLOCK
5
6~17
QO~Q11
18
19
20
Notes : OE Pull down to V
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Name
I/O
V
-
GND
SS
NC
-
N.C
DATA
I
Serial Data
I
Shift clock for shift register (Trailing edge trigger)
LCK
I
Latch clock for storage register (Trailing edge trigger)
O
Parallrl data output (Nch Openn Drain FET)
(Q
)
X
SO
O
Serial data output
OE
I
Output enable control input
V
-
Power spply
DD
SS
Control
circuit
Description
Latch
L
Output FET
ON
- 47 -
20 V
DD
19 OE
18 SO
17 Q11
16 Q10
15 Q9
14 Q8
13 Q7
12 Q6
11 Q5
H
OFF
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