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MC14521B bảng dữ liệu(PDF) 4 Page - ON Semiconductor

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Giải thích chi tiết về linh kiện  24-Stage Frequency Divider
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MC14521B bảng dữ liệu(HTML) 4 Page - ON Semiconductor

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MC14521B
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4
SWITCHING CHARACTERISTICS (Note 5) (CL = 50 pF, TA = 25_C)
Characteristic
Symbol
VDD
Vdc
Min
Typ
(Note 6)
Max
Unit
Output Rise and Fall Time (Counter Outputs)
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 + 12.5 ns
tTLH, tTHL
5.0
10
15
100
50
40
200
100
80
ns
Propagation Delay Time
Clock to Q18
tPHL, tPLH = (1.7 ns/pF) CL + 4415 ns
tPHL, tPLH = (0.66 ns/pF) CL + 1667 ns
tPHL, tPLH = (0.5 ns/pF) CL + 1275 ns
Clock to Q24
tPHL, tPLH = (1.7 ns/pF) CL + 5915 ns
tPHL, tPLH = (0.66 ns/pF) CL + 2167 ns
tPHL, tPLH = (0.5 ns/pF) CL + 1675 ns
tPHL, tPLH
5.0
10
15
4.5
1.7
1.3
9.0
3.5
2.7
ms
5.0
10
15
6.0
2.2
1.7
12
4.5
3.5
Propagation Delay Time
Reset to Qn
tPHL = (1.7 ns/pF) CL + 1215 ns
tPHL = (0.66 ns/pF) CL + 467 ns
tPHL = (0.5 ns/pF) CL + 350 ns
tPHL
5.0
10
15
1300
500
375
2600
1000
750
ns
Clock Pulse Width
tWH(cl)
5.0
10
15
385
150
120
140
55
40
ns
Clock Pulse Frequency
fcl
5.0
10
15
3.5
9.0
12
2.0
5.0
6.5
MHz
Clock Rise and Fall Time
tTLH, tTHL
5.0
10
15
15
5.0
4.0
ms
Reset Pulse Width
tWH(R)
5.0
10
15
1400
600
450
700
300
225
ns
Reset Removal Time
trem
5.0
10
15
30
0
– 40
– 200
– 160
– 110
ns
5. The formulas given are for the typical characteristics only at 25_C.
6. 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
VDD
VDD
VDD
VSS
VSS
Q18
Q19
Q20
Q21
Q22
Q23
Q24
CL
CL
CL
CL
CL
CL
CL
ID
IN 2
R
500
mF
0.01
mF
CERAMIC
20 ns
20 ns
VDD
0 V
Vin
50% DUTY CYCLE
90%
10%
50%


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