Philips Semiconductors
Product specification
8-bit static shift register
FUNCTION TABLES
Serial operation
INPUTS
n
1
2
3
6
7
8
CP
D
S
D
1
D
2
D
3
X
X
X
X
PL
L
L
L
L
L
L
L
O
5
X
X
X
D
1
D
2
D
3
OUTPUTS
O
6
X
X
X
X
D
1
D
2
no change
O
7
X
X
X
X
X
D
1
Notes
n
CP
X
HEF4021B
MSI
Parallel operation
INPUTS
D
S
X
PL
H
O
5
P
5
OUTPUTS
O
6
P
6
O
7
P
7
1. H = HIGH state (the more positive voltage)
L = LOW state (the less positive voltage)
X = state is immaterial
= positive-going transition
= negative-going transition
D
n
= either HIGH or LOW
n = number of clock pulse transitions
AC CHARACTERISTICS
V
SS
= 0 V; T
amb
= 25
°C;
C
L
= 50 pF; input transition times
≤
20 ns
V
DD
V
Propagation delays
CP
→
O
n
HIGH to LOW
5
10
15
5
LOW to HIGH
PL
→
O
n
HIGH to LOW
10
15
5
10
15
5
LOW to HIGH
Output transition
times
HIGH to LOW
LOW to HIGH
10
15
5
10
15
5
10
15
t
TLH
t
THL
t
PLH
t
PHL
t
PLH
t
PHL
125
55
40
115
50
40
120
55
40
105
50
40
60
30
20
60
30
20
250
110
80
230
100
80
240
110
80
210
100
80
120
60
40
120
60
40
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
98 ns
+
(0,55 ns/pF) C
L
44 ns
+
(0,23 ns/pF) C
L
32 ns
+
(0,16 ns/pF) C
L
88 ns
+
(0,55 ns/pF) C
L
39 ns
+
(0,23 ns/pF) C
L
32 ns
+
(0,16 ns/pF) C
L
93 ns
+
(0,55 ns/pF) C
L
44 ns
+
(0,23 ns/pF) C
L
32 ns
+
(0,16 ns/pF) C
L
78 ns
+
(0,55 ns/pF) C
L
39 ns
+
(0,23 ns/pF) C
L
32 ns
+
(0,16 ns/pF) C
L
10 ns
+
(1,0 ns/pF) C
L
9 ns
+
(0,42 ns/pF) C
L
6 ns
+
(0,28 ns/pF) C
L
10 ns
+
(1,0 ns/pF) C
L
9 ns
+
(0,42 ns/pF) C
L
6 ns
+
(0,28 ns/pF) C
L
SYMBOL
MIN.
TYP.
MAX.
TYPICAL EXTRAPOLATION
FORMULA
January 1995
4
ETC [ ETC ]
