hef4557b NXP Semiconductors, hef4557b Datasheet - Page 6

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

Philips Semiconductors
AC CHARACTERISTICS
V
Note
1. The set-up, hold and recovery times vary with the minimum number of bits selected. For other values as specified
January 1995
Minimum clock
Minimum reset
Set-up times
Hold times
Recovery times for MR
Minimum clock
SS
1-to-64 bit variable length shift register
pulse width;
LOW for CP
HIGH for CP
pulse width;
D
CP
L
L
D
CP
L
L
L
L
pulse frequency
one may interpolate as shown in the table (see previous page).
= 0 V; T
1
32
1
32
1
32
A
A
HIGH
, D
to L
, D
to L
to L
1
1
= HIGH
= HIGH
= HIGH
B
B
32
32
32
, A/B
, A/B
= LOW
= LOW
= LOW
amb
0
1
= 25 C; C
or
CP
CP
0
0
,
,
L
= 50 pF; input transition times
V
10
15
10
15
10
15
10
15
10
15
10
15
10
15
10
15
10
15
V
DD
5
5
5
5
5
5
5
5
5
t
t
t
t
t
t
t
t
t
f
SYMBOL
WCPL
WCPH
WMRH
su
su
hold
hold
RMR
RMR
max
or
MIN.
180
150
360
140
500
250
150
110
2,5
60
40
70
50
90
40
35
30
40
10
90
60
50
70
60
10
0
7
6
20 ns; see also waveforms Fig.4
TYP.
180 ns
250 ns
125 ns
110 ns
90 ns
30 ns
20 ns
75 ns
35 ns
25 ns
70 ns
45 ns
20 ns
10 ns
45 ns
30 ns
30 ns
20 ns
15 ns
75 ns
50 ns
30 ns
25 ns
14 MHz
20 MHz
5 ns
5 MHz
see note
Product specification
HEF4557B
LSI