
2
PS8090C 02/07/00
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PI74ALVCH16721
3.3V 20-Bit Flip-Flop with 3-State Outputs
s
t
u
p
n
Is
t
u
p
t
u
O
E
ON
E
K
L
CK
L
Cx
Dx
Q
LH
X
Q0
LL
↑
HH
LL
↑
LL
H
r
o
LX
Q0
HX
X
Z
Pin Name
Description
OE
Output Enable Input (Active LOW)
CLKEN
Clock Enable Input (Active LOW)
CLK
Clock Input (Active HIGH)
Dx
Data Inputs
Qx
3-State Outputs
GND
Ground
VCC
Power
Product Pin Description
Truth Table(1)
Product Pin Configuration
Notes:
1. H = High Signal Level
L = Low Signal Level
X = Don't Care or Irrelevant
Z = High Impedance
↑ = LOW-to-HIGH Transition
1
OE
Q1
Q2
GND
Q3
Q4
VCC
Q5
Q6
Q7
GND
Q8
Q9
Q10
Q11
Q12
Q13
GND
Q14
Q15
Q16
VCC
Q17
Q18
GND
Q19
Q20
NC
CLK
D1
D2
GND
D3
D4
VCC
D5
D6
D7
GND
D8
D9
D10
D11
D12
D13
GND
D14
D15
D16
VCC
D17
D18
GND
D19
D20
CLKEN
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
56
55
54
53
52
51
50
49
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
25
26
27
28
32
31
30
29
56-Pin
A,V