參數(shù)資料
型號(hào): MC14520B
廠商: ON SEMICONDUCTOR
元件分類: 通用總線功能
英文描述: Dual Up Counters(雙BCD計(jì)數(shù)器)
中文描述: 雙柜位(雙BCD碼計(jì)數(shù)器)
文件頁(yè)數(shù): 4/9頁(yè)
文件大小: 112K
代理商: MC14520B
MC14518B, MC14520B
http://onsemi.com
4
(6.)
Characteristic
Symbol
V
DD
Unit
Min
Typ
(7.)
Max
Output Rise and Fall Time
t
TLH
, t
THL
= (1.5 ns/pF) C
L
+ 25 ns
t
TLH
, t
THL
= (0.75 ns/pF) C
L
+ 12.5 ns
t
TLH
, t
THL
= (0.55 ns/pF) C
L
+ 9.5 ns
t
TLH
,
t
THL
5.0
10
15
100
50
40
200
100
80
ns
Propagation Delay Time
Clock to Q/Enable to Q
t
PLH
, t
PHL
= (1.7 ns/pF) C
L
+ 215 ns
t
PLH
, t
PHL
= (0.66 ns/pF) C
L
+ 97 ns
t
PLH
, t
PHL
= (0.5 ns/pF) C
L
+ 75 ns
Reset to Q
t
PHL
= (1.7 ns/pF) C
L
+ 265 ns
t
PHL
= (0.66 ns/pF) C
L
+ 117 ns
t
PHL
= (0.66 ns/pF) C
L
+ 95 ns
t
PLH
,
t
PHL
5.0
10
15
280
115
80
560
230
160
ns
t
PHL
5.0
10
15
330
130
90
650
230
170
ns
Clock Pulse Width
t
w(H)
t
w(L)
5.0
10
15
200
100
70
100
50
35
ns
Clock Pulse Frequency
f
cl
5.0
10
15
2.5
6.0
8.0
1.5
3.0
4.0
MHz
Clock or Enable Rise and Fall Time
t
THL
, t
TLH
5.0
10
15
15
5
4
μ
s
Enable Pulse Width
t
WH(E)
5.0
10
15
440
200
140
220
100
70
ns
Reset Pulse Width
t
WH(R)
5.0
10
15
280
120
90
125
55
40
ns
Reset Removal Time
t
rem
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
C
L
C
L
C
L
C
L
V
DD
V
SS
V
SS
500
μ
F
0.01
μ
F
CERAMIC
20 ns
50%
10%
90%
20 ns
I
D
Q3
Q2
Q1
Q0
C
E
R
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