MC14518B, MC14520B
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4
SWITCHING CHARACTERISTICS (6.) (CL = 50 pF, TA = 25_C) Characteristic
Symbol
VDD
All Types
Unit
Min
Max
Output Rise and Fall Time
tTLH, tTHL = (1.5 ns/pF) CL + 25 ns
tTLH, tTHL = (0.75 ns/pF) CL + 12.5 ns
tTLH, tTHL = (0.55 ns/pF) CL + 9.5 ns
tTLH,
tTHL
5.0
10
15
—
100
50
40
200
100
80
ns
Propagation Delay Time
Clock to Q/Enable to Q
tPLH, tPHL = (1.7 ns/pF) CL + 215 ns
tPLH, tPHL = (0.66 ns/pF) CL + 97 ns
tPLH, tPHL = (0.5 ns/pF) CL + 75 ns
Reset to Q
tPHL = (1.7 ns/pF) CL + 265 ns
tPHL = (0.66 ns/pF) CL + 117 ns
tPHL = (0.66 ns/pF) CL + 95 ns
tPLH,
tPHL
5.0
10
15
—
280
115
80
560
230
160
ns
tPHL
5.0
10
15
—
330
130
90
650
230
170
ns
Clock Pulse Width
tw(H)
tw(L)
5.0
10
15
200
100
70
100
50
35
—
ns
Clock Pulse Frequency
fcl
5.0
10
15
—
2.5
6.0
8.0
1.5
3.0
4.0
MHz
Clock or Enable Rise and Fall Time
tTHL, tTLH
5.0
10
15
—
15
5
4
μs
Enable Pulse Width
tWH(E)
5.0
10
15
440
200
140
220
100
70
—
ns
Reset Pulse Width
tWH(R)
5.0
10
15
280
120
90
125
55
40
—
ns
Reset Removal Time
trem
5.0
10
15
– 5
15
20
– 45
– 15
– 5
—
ns
6. The formulas given are for the typical characteristics only at 25_C.
7. Data labelled “Typ” is not to be used for design purposes but is intended as an indication of the IC’s potential performance.
Figure 1. Power Dissipation Test Circuit and Waveform
PULSE
GENERATOR
VARIABLE
WIDTH
CL
VDD
VSS
500
μF
0.01
μF
CERAMIC
20 ns
50%
10%
90%
20 ns
ID
Q3
Q2
Q1
Q0
C
E
R