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74LS90 查看數據表(PDF) - Motorola => Freescale

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74LS90 DECADE COUNTER / DIVIDE-BY-TWELVE COUNTER / 4-BIT BINARY COUNTER Motorola
Motorola => Freescale Motorola
74LS90 Datasheet PDF : 6 Pages
1 2 3 4 5 6
SN54/74LS90 SN54/74LS92 SN54/74LS93
AC CHARACTERISTICS (TA = 25°C, VCC = 5.0 V, CL = 15 pF)
Limits
LS90
LS92
LS93
Symbol
Parameter
Min Typ Max Min Typ Max Min Typ Max Unit
fMAX
fMAX
tPLH
tPHL
CP0 Input Clock Frequency
CP1 Input Clock Frequency
Propagation Delay,
CP0 Input to Q0 Output
32
32
32
MHz
16
16
16
MHz
10 16
12 18
10 16
12 18
10 16
12 18
ns
tPLH
tPHL
CP0 Input to Q3 Output
32 48
34 50
32 48
34 50
46 70
46 70
ns
tPLH
tPHL
CP1 Input to Q1 Output
10 16
14 21
10 16
14 21
10 16
14 21
ns
tPLH
tPHL
CP1 Input to Q2 Output
21 32
23 35
10 16
14 21
21 32
23 35
ns
tPLH
tPHL
CP1 Input to Q3 Output
21 32
23 35
21 32
23 35
34 51
34 51
ns
tPLH
tPHL
tPHL
MS Input to Q0 and Q3 Outputs
MS Input to Q1 and Q2 Outputs
MR Input to Any Output
20 30
26 40
26 40
26 40
ns
ns
26 40
ns
AC SETUP REQUIREMENTS (TA = 25°C, VCC = 5.0 V)
Limits
LS90
LS92
LS93
Symbol
Parameter
Min
Max
Min
Max
Min
Max
Unit
tW
CP0 Pulse Width
15
15
15
ns
tW
CP1 Pulse Width
30
30
30
ns
tW
MS Pulse Width
15
ns
tW
MR Pulse Width
15
15
15
ns
trec
Recovery Time MR to CP
25
25
25
ns
RECOVERY TIME (trec) is defined as the minimum time required between the end of the reset pulse and the clock transition from HIGH-to-LOW in order to recognize
and transfer HIGH data to the Q outputs
AC WAVEFORMS
*CP 1.3 V
tPHL
Q
1.3 V
1.3 V
tW
1.3 V
tPLH
1.3 V
Figure 1
*The number of Clock Pulses required between the tPHL and tPLH measurements can be determined from the appropriate Truth Tables.
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
Q0 Q3
tPLH
(LS90)
FAST AND LS TTL DATA
5-95
1.3 V
tW
trec
1.3 V
1.3 V
Figure 3
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