HEF4518 Просмотр технического описания (PDF) - Philips Electronics
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HEF4518 Datasheet PDF : 7 Pages
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Philips Semiconductors
Dual BCD counter
Product specification
HEF4518B
MSI
AC CHARACTERISTICS
VSS = 0 V; Tamb = 25 °C; CL = 50 pF; input transition times ≤ 20 ns
VDD
V
SYMBOL MIN. TYP. MAX.
Propagation delays
CP0 , CP1 → On
HIGH to LOW
LOW to HIGH
MR → On
HIGH to LOW
Output transition
times
HIGH to LOW
LOW to HIGH
Minimum CP0
pulse width; LOW
Minimum CP1
pulse width; HIGH
Minimum MR
pulse width; HIGH
Recovery time
for MR
Set-up times
CP0 → CP1
CP1 → CP0
Maximum clock
pulse frequency
5
10 tPHL
15
5
10 tPLH
15
5
10 tPHL
15
5
10 tTHL
15
5
10 tTLH
15
5
10 tWCPL
15
5
10 tWCPH
15
5
10 tWMRH
15
5
10 tRMR
15
5
10 tsu
15
5
10 tsu
15
5
10 fmax
15
120 240 ns
55 110 ns
40 80 ns
120 240 ns
55 110 ns
40 80 ns
75 150 ns
35 70 ns
25 50 ns
60 120 ns
30 60 ns
20 40 ns
60 120 ns
30 60 ns
20 40 ns
60
30
ns
30
15
ns
20
10
ns
60
30
ns
30
15
ns
20
10
ns
30
15
ns
20
10
ns
16
8
ns
50
25
ns
30
15
ns
20
10
ns
50
25
ns
30
15
ns
20
10
ns
50
25
ns
30
15
ns
20
10
ns
8
16
MHz
15
30
MHz
20
40
MHz
TYPICAL EXTRAPOLATION
FORMULA
93 ns + (0,55 ns/pF) CL
44 ns + (0,23 ns/pF) CL
32 ns + (0,16 ns/pF) CL
93 ns + (0,55 ns/pF) CL
44 ns + (0,23 ns/pF) CL
32 ns + (0,16 ns/pF) CL
48 ns + (0,55 ns/pF) CL
24 ns + (0,23 ns/pF) CL
17 ns + (0,16 ns/pF) CL
10 ns + (1,0 ns/pF) CL
9 ns + (0,42 ns/pF) CL
6 ns + (0,28 ns/pF) CL
10 ns + (1,0 ns/pF) CL
9 ns + (0,42 ns/pF) CL
6 ns + (0,28 ns/pF) CL
see also waveforms
Figs 4 and 5
January 1995
4
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