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DM74LS90 датащи(PDF) 4 Page - Fairchild Semiconductor

номер детали DM74LS90
подробное описание детали  Decade and Binary Counters
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производитель  FAIRCHILD [Fairchild Semiconductor]
домашняя страница  http://www.fairchildsemi.com
Logo FAIRCHILD - Fairchild Semiconductor

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4
Electrical Characteristics (Continued)
Note 8: QA outputs are tested at IOL = Max plus the limit value of IIL for the B input. This permits driving the B input while maintaining full fan-out capability.
Note 9: Not more than one output should be shorted at a time, and the duration should not exceed one second.
Note 10: ICC is measured with all outputs open, both RO inputs grounded following momentary connection to 4.5V and all other inputs grounded.
Switching Characteristics at V
CC = 5V and TA = 25°C
From (Input)
RL = 2 kΩ
Symbol
Parameter
To (Output)
CL = 15 pF
CL = 50 pF
Units
Min
Max
Min
Max
fMAX
Maximum Clock
A to QA
32
20
MHz
Frequency
B to QB
16
10
tPLH
Propagation Delay Time
A to QA
16
20
ns
LOW-to-HIGH Level Output
tPHL
Propagation Delay Time
A to QA
18
24
ns
HIGH-to-LOW Level Output
tPLH
Propagation Delay Time
A to QD
48
52
ns
LOW-to-HIGH Level Output
tPHL
Propagation Delay Time
A to QD
50
60
ns
HIGH-to-LOW Level Output
tPLH
Propagation Delay Time
B to QB
16
23
ns
LOW-to-HIGH Level Output
tPHL
Propagation Delay Time
B to QB
21
30
ns
HIGH-to-LOW Level Output
tPLH
Propagation Delay Time
B to QC
32
37
ns
LOW-to-HIGH Level Output
tPHL
Propagation Delay Time
B to QC
35
44
ns
HIGH-to-LOW Level Output
tPLH
Propagation Delay Time
B to QD
32
36
ns
LOW-to-HIGH Level Output
tPHL
Propagation Delay Time
B to QD
35
44
ns
HIGH-to-LOW Level Output
tPLH
Propagation Delay Time
SET-9 to QA, QD
30
35
ns
LOW-to-HIGH Level Output
tPHL
Propagation Delay Time
SET-9 to QB, QC
40
48
ns
HIGH-to-LOW Level Output
tPHL
Propagation Delay Time
SET-0 to Any Q
40
52
ns
HIGH-to-LOW Level Output


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