MC54F256J 查看數據表（PDF） - Motorola => Freescale
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MC54F256J Datasheet PDF : 4 Pages
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MC54/74F256
AC CHARACTERISTICS
Symbol
tPLH
tPHL
tPLH
tPHL
tPLH
tPHL
tPHL
Parameter
Propagation Delay
E to Qn
Propagation Delay
Dn to Qn
Propagation Delay
An to Qn
Propagation Delay
MR to Qn
54/74F
54F
74F
TA = +25°C
VCC = +5.0 V
CL = 50 pF
TA = –55 to +125°C
VCC = 5.0 V ±10%
CL = 50 pF
TA = 0 to 70°C
VCC = 5.0 V ± 5%
CL = 50 pF
Min
Max
Min
Max
Min
Max
Unit
4.0
10.5
4.0
13
4.0
12
3.0
7.0
3.0
8.5
3.0
7.5
ns
3.5
9.0
3.5
11.5
3.5
10
3.0
7.0
2.5
8.5
2.5
7.5
ns
3.5
14
3.5
15.5
3.5
14.5
4.0
9.5
4.0
11
4.0
10
ns
5.0
9.0
4.5
11.5
4.5
10
ns
AC OPERATING REQUIREMENTS
54/74F
54F
74F
TA = +25°C
VCC = +5.0 V
TA = –55 to +125°C
VCC = 5.0 V ±10%
TA = 0 to 70°C
VCC = 5.0 V ± 5%
Unit
Symbol
Parameter
Min
Max
Min
Max
Min
Max
ts(H)
Setup Time, HIGH or LOW
4.0
5.0
ts(L)
Dn to E
4.0
5.0
4.0
4.0
ns
th(H)
Hold Time, HIGH or LOW
2.0
2.0
th(L)
Dn to E
2.0
2.0
2.0
2.0
ns
ts(H)
Setup Time, HIGH or LOW
4.0
4.0
ts(L)
A to E(a)
4.0
4.0
4.0
4.0
ns
th(H)
Hold Time HIGH or LOW
0
0
th(L)
A to E(b)
0
0
0
0
ns
tW
E Pulse Width
4.0
4.0
4.0
ns
tW
MR Pulse Width
4.0
4.0
4.0
ns
NOTES:
1. The Address to Enable setup time is the time before the HIGH-to-LOW Enable transition that the Address must be stable so that the correct latch is
1. addressed and the other latches are not affected.
2. The Address to Enable hold time is the time after the LOW-to-HIGH Enable transition that the Address must be stable so that the correct latch is addressed
1. and the other latches are not affected.
FAST AND LS TTL DATA
4-126
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