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