SN54LS490J 데이터 시트보기 (PDF) - Motorola => Freescale
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SN54LS490J Datasheet PDF : 5 Pages
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SN54 / 74LS490
AC CHARACTERISTICS (TA = 25°C)
Symbol
fMAX
tPLH
tPHL
tPLH
tPHL
tPLH
tPHL
tPHL
tPLH
tPHL
Parameter
Maximum Clock Frequency
Propagation Delay, CP to Q0
Propagation Delay, CP to Q1 or Q3
Propagation Delay, CP to Q2
Propagation Delay, MR to Output
Propagation Delay, MS to Output
Limits
Min Typ Max
25
35
12
20
13
20
24
39
26
39
32
54
36
54
24
39
24
39
20
36
Unit
MHz
ns
ns
ns
ns
ns
AC WAVEFORMS
Test Conditions
Figure 1
Figure 1
Figure 3
Figure 2
Figure 2
Figure 2
VCC = 5.0 V,
CL = 15 pF
*CP
1.3 V
tPHL
tW
Q
1.3 V
Figure 1
1.3 V
tPLH
1.3 V
MR & MS
1.3 V
CP
tPHL
Q
1.3 V
tW
trec
1.3 V
1.3 V
Figure 2
MS
1.3 V
CP
tPLH
QO, Q3
1.3 V
tW
trec
1.3 V
1.3 V
Figure 3
*The number of Clock Pulses required between the tPHL and tPLH measurements can be determined from the Truth Table.
FAST AND LS TTL DATA
5-565
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