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參數(shù)資料
| 型號： | 74LS90 |
| 廠商： | Motorola, Inc. |
| 元件分類： | 通用總線功能 |
| 英文描述： | DECADE COUNTER; DIVIDE-BY-TWELVE COUNTER; 4-BIT BINARY COUNTER |
| 中文描述： | 十年計(jì)數(shù)器;分頻12項(xiàng)反，4位二進(jìn)制計(jì)數(shù)器 |
| 文件頁數(shù)： | 3/10頁 |
| 文件大?。?/td> | 131K |
| 代理商： | 74LS90 |
’LS90 Electrical Characteristics
over recommended operating free air temperature range (unless otherwise noted) (Continued)
Symbol
Parameter
Conditions
Min
Typ
Max
Units
(Note 1)
I
IH
High Level Input
Current
V
CC
e
Max, V
I
e
2.7V
Reset
20
A
40
m
A
B
80
I
IL
Low Level Input
Current
V
CC
e
Max, V
I
e
0.4V
Reset
b
0.4
A
b
2.4
mA
B
b
3.2
I
OS
Short Circuit
Output Current
V
CC
e
Max (Note 2)
b
20
b
100
mA
I
CC
Note 1:
All typicals are at V
CC
e
5V, T
A
e
25
§
C.
Note 2:
Not more than one output should be shorted at a time, and the duration should not exceed one second.
Supply Current
V
CC
e
Max (Note 3)
9
15
mA
Note 3:
I
CC
is measured with all outputs open, both RO inputs grounded following momentary connection to 4.5V and all other inputs grounded.
Note 4:
Q
A
outputs are tested at I
OL
e
Max plus the limit value of I
IL
for the B input. This permits driving the B input while maintaining full fan-out capability.
’LS90 Switching Characteristics
at V
CC
e
5V and T
A
e
25
§
C (See Section 1 for Test Waveforms and Output Load)
From (Input)
To (Output)
R
L
e
2 k
X
Symbol
Parameter
C
L
e
15 pF
C
L
e
50 pF
Units
Min
Max
Min
Max
f
MAX
Maximum Clock
Frequency
A to Q
A
32
20
MHz
B to Q
B
16
10
t
PLH
Propagation Delay Time
Low to High Level Output
A to Q
A
16
20
ns
t
PHL
Propagation Delay Time
High to Low Level Output
A to Q
A
18
24
ns
t
PLH
Propagation Delay Time
Low to High Level Output
A to Q
D
48
52
ns
t
PHL
Propagation Delay Time
High to Low Level Output
A to Q
D
50
60
ns
t
PLH
Propagation Delay Time
Low to High Level Output
B to Q
B
16
23
ns
t
PHL
Propagation Delay Time
High to Low Level Output
B to Q
B
21
30
ns
t
PLH
Propagation Delay Time
Low to High Level Output
B to Q
C
32
37
ns
t
PHL
Propagation Delay Time
High to Low Level Output
B to Q
C
35
44
ns
t
PLH
Propagation Delay Time
Low to High Level Output
B to Q
D
32
36
ns
t
PHL
Propagation Delay Time
High to Low Level Output
B to Q
D
35
44
ns
t
PLH
Propagation Delay Time
Low to High Level Output
SET-9 to
Q
A
, Q
D
30
35
ns
t
PHL
Propagation Delay Time
High to Low Level Output
SET-9 to
Q
B
, Q
C
40
48
ns
t
PHL
Propagation Delay Time
High to Low Level Output
SET-0 to
Any Q
40
52
ns
3
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