January 1995
4
Philips Semiconductors
Product specification
Dual BCD counter
HEF4518B
MSI
AC CHARACTERISTICS
V
SS
= 0 V; T
amb
= 25
°
C; C
L
= 50 pF; input transition times
≤
20 ns
V
DD
V
SYMBOL
MIN.
TYP.
MAX.
TYPICAL EXTRAPOLATION
FORMULA
Propagation delays
CP
0
, CP
1
→
O
n
HIGH to LOW
5
120
55
40
120
55
40
75
35
25
240 ns
110 ns
80 ns
240 ns
110 ns
80 ns
150 ns
70 ns
50 ns
93 ns
44 ns
32 ns
93 ns
44 ns
32 ns
48 ns
24 ns
17 ns
+
+
+
+
+
+
+
+
+
(0,55 ns/pF) C
L
(0,23 ns/pF) C
L
(0,16 ns/pF) C
L
(0,55 ns/pF) C
L
(0,23 ns/pF) C
L
(0,16 ns/pF) C
L
(0,55 ns/pF) C
L
(0,23 ns/pF) C
L
(0,16 ns/pF) C
L
10
15
5
10
15
5
10
15
t
PHL
LOW to HIGH
t
PLH
MR
→
O
n
HIGH to LOW
t
PHL
Output transition
times
HIGH to LOW
5
60
30
20
60
30
20
30
15
10
30
15
10
15
10
120 ns
60 ns
40 ns
120 ns
60 ns
40 ns
10 ns
9 ns
6 ns
10 ns
9 ns
6 ns
+
+
+
+
+
+
(1,0 ns/pF) C
L
(0,42 ns/pF) C
L
(0,28 ns/pF) C
L
(1,0 ns/pF) C
L
(0,42 ns/pF) C
L
(0,28 ns/pF) C
L
10
15
5
10
15
5
10
15
5
10
15
5
10
15
5
10
15
5
10
15
5
10
15
5
10
15
t
THL
LOW to HIGH
t
TLH
Minimum CP
0
pulse width; LOW
60
30
20
60
30
20
30
20
16
50
30
20
50
30
20
50
30
20
8
15
20
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
MHz
MHz
MHz
t
WCPL
Minimum CP
1
pulse width; HIGH
t
WCPH
Minimum MR
pulse width; HIGH
t
WMRH
8
Recovery time
for MR
25
15
10
25
15
10
25
15
10
16
30
40
see also waveforms
Figs 4 and 5
t
RMR
Set-up times
CP
0
→
CP
1
t
su
CP
1
→
CP
0
t
su
Maximum clock
pulse frequency
f
max