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Número de pieza
componentes Descripción
HEF4557BDF Ver la hoja de datos (PDF) - Philips Electronics
Número de pieza
componentes Descripción
Fabricante
HEF4557BDF
1-to-64 bit variable length shift register
Philips Electronics
HEF4557BDF Datasheet PDF : 7 Pages
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Philips Semiconductors
1-to-64 bit variable length shift register
Product specification
HEF4557B
LSI
AC CHARACTERISTICS
V
SS
= 0 V; T
amb
= 25
°
C; C
L
= 50 pF; input transition times
≤
20 ns; see also waveforms Fig.4
V
DD
V
SYMBOL MIN. TYP.
Minimum clock
pulse width;
LOW for CP
0
or
HIGH for CP
1
Minimum reset
pulse width;
HIGH
Set-up times
D
A
, D
B
, A/B
→
CP
0
,
CP
1
L
1
to L
32
= LOW
L
32
= HIGH
Hold times
D
A
, D
B
, A/B
→
CP
0
,
CP
1
L
1
to L
32
= LOW
L
32
= HIGH
Recovery times for MR
L
1
to L
32
= LOW
L
32
= HIGH
Minimum clock
pulse frequency
5
t
WCPL
10
or
15
t
WCPH
5
10
t
WMRH
15
5
10
t
su
15
5
10
t
su
15
5
10
t
hold
15
5
10
t
hold
15
5
10
t
RMR
15
5
10
t
RMR
15
5
10
f
max
15
180
90 ns
60
30 ns
40
20 ns
150
75 ns
70
35 ns
50
25 ns
360 180 ns
140
70 ns
90
45 ns
40
−
20 ns
35
−
10 ns
30
−
5 ns
−
40
−
110 ns
−
10
−
45 ns
0
−
30 ns
90
30 ns
60
20 ns
50
15 ns
500 250 ns
250 125 ns
150
75 ns
110
50 ns
70
30 ns
60
25 ns
2,5
5 MHz
7
14 MHz
10
20 MHz
see note
Note
1. The set-up, hold and recovery times vary with the minimum number of bits selected. For other values as specified
one may interpolate as shown in the table (see previous page).
January 1995
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