hef4557b NXP Semiconductors, hef4557b Datasheet - Page 5

• Manufacturer Part Number: hef4557b
• Description: 1-to-64 Bit Variable Length Shift Register
• Manufacturer: NXP Semiconductors

Philips Semiconductors
AC CHARACTERISTICS
V
Interpolation table (see note next page)
Notes
1. H = HIGH state (the more positive voltage)
2. L = LOW state (the less positive voltage)
3. X = state is immaterial
January 1995
Propagation delays
Output transition times
SS
1-to-64 bit variable length shift register
CP
MR
MR
L
H
X
X
X
X
X
L
= 0 V; T
1
HIGH to LOW
LOW to HIGH
HIGH to LOW
LOW to HIGH
HIGH to LOW
LOW to HIGH
0
, CP
LENGTH CONTROL INPUTS
O
O
1
L
H
X
X
X
X
L
L
amb
2
O, O
= 25 C; C
L
H
X
X
X
L
L
L
4
L
L
H
= 50 pF; input transition times
X
X
L
L
L
L
8
V
10
15
10
15
10
15
10
15
10
15
10
15
V
5
5
5
5
5
5
DD
L
H
X
L
L
L
L
L
16
t
t
t
t
t
t
PHL
PLH
PHL
PLH
THL
TLH
SYMBOL
L
H
L
L
L
L
L
L
32
BITS SELECTED
NUMBER OF
MINIMUM
TYP.
5
240
240
170
140
17
33
20 ns
90
65
90
65
80
60
70
55
60
30
20
60
30
20
1
2
3
5
9
MAX.
480
180
130
480
180
130
340
160
120
280
140
120
120
110
60
40
60
40
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
SET-UP, HOLD,
six equal steps
RECOVERY
specified
specified
TIMES
213 ns
213 ns
143 ns
113 ns
TYPICAL EXTRAPOLATION
79 ns
57 ns
79 ns
57 ns
69 ns
52 ns
59 ns
47 ns
10 ns
10 ns
9 ns
6 ns
9 ns
6 ns
FORMULA
(0,55 ns/pF) C
(0,23 ns/pF) C
(0,16 ns/pF) C
(0,55 ns/pF) C
(0,23 ns/pF) C
(0,16 ns/pF) C
(0,55 ns/pF) C
(0,23 ns/pF) C
(0,16 ns/pF) C
(0,55 ns/pF) C
(0,23 ns/pF) C
(0,16 ns/pF) C
(1,0 ns/pF) C
(0,42 ns/pF) C
(0,28 ns/pF) C
(1,0 ns/pF) C
(0,42 ns/pF) C
(0,28 ns/pF) C
Product specification
HEF4557B
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
LSI