MC74AC646, MC74ACT646
AC CHARACTERISTICS
(For Figures and Waveforms – See Section 3 of the ON Semiconductor FACT Data Book, DL138/D)
74AC
Symbol
Parameter
VCC*
(V)
Min
tPLH
tPHL
tPLH
tPHL
Propagation Delay
Clock to Bus
Propagation Delay
Clock to Bus
Propagation Delay
Bus to Bus
Propagation Delay
Bus to Bus
Propagation Delay
SBA or SAB to An or Bn
(w/An or Bn HIGH or LOW)
Propagation Delay
SBA or SAB to An or Bn
(w/An or Bn HIGH or LOW)
Enable Time
G to An or Bn
Enable Time
G to An or Bn
Disable Time
G to An or Bn
Disable Time
G to An or Bn
Enable Time
DIR to An or Bn
Enable Time
DIR to An or Bn
Disable Time
DIR to An or Bn
Disable Time
DIR to An or Bn
3.3
5.0
3.3
5.0
3.3
5.0
3.3
5.0
3.3
33
5.0
3.3
33
5.0
3.3
5.0
3.3
5.0
3.3
5.0
3.3
5.0
3.3
5.0
3.3
5.0
3.3
5.0
3.3
5.0
4.0
2.5
3.0
2.0
2.5
1.5
1.5
1.5
2.0
20
1.5
1.5
15
1.5
2.5
1.5
2.5
1.5
3.0
2.0
2.0
1.5
2.0
1.5
2.5
1.5
2.5
1.5
1.5
1.5
TA = +25°C
CL = 50 pF
Typ
10.5
7.5
9.5
6.5
7.5
5.0
7.5
5.0
8.5
85
6.0
8.5
85
6.0
7.0
5.0
7.5
5.5
8.0
6.5
7.5
6.0
6.5
5.0
7.0
5.0
7.5
5.5
7.5
5.5
Max
16.5
12
14.5
10.5
12
8.0
12.5
9.0
13.5
13 5
10
13.5
13 5
10
11.5
8.5
12.5
9.0
12.5
10
12
9.5
11
7.5
11.5
8.0
11.5
9.5
12
9.5
74AC
TA = –40°C
to +85°C
CL = 50 pF
Min
3.0
2.0
2.5
1.5
2.0
1.0
1.5
1.0
1.5
15
1.5
1.5
15
1.5
2.0
1.5
2.0
1.5
2.5
2.0
2.0
1.5
1.5
1.0
2.0
1.0
1.5
1.5
1.5
1.5
Max
18.5
13
16
11.5
13.5
9.0
13.5
9.5
15.5
15 5
11
15
11
12.5
9.0
14
10
13.5
11
13.5
10.5
12
8.5
13
9.0
12.5
10
13.5
10.5
ns
ns
ns
ns
3–6
3–6
3–5
3–5
Unit
Fig.
No.
tPLH
ns
3–6
tPHL
ns
3–6
tPZH
tPZL
tPHZ
tPLZ
tPZH
tPZL
tPHZ
tPLZ
ns
ns
ns
ns
ns
ns
ns
ns
3–7
3–8
3–7
3–8
3–7
3–8
3–7
3–8
*Voltage Range 3.3 V is 3.3 V
±0.3
V.
Voltage Range 5.0 V is 5.0 V
±0.5
V.
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