IN74AC257
AC ELECTRICAL CHARACTERISTICS
(C
L
=50pF, Input t
r
=t
f
=3.0 ns)
V
CC*
Symbol
Parameter
V
Guaranteed Limits
25
°C
Min
t
PLH
t
PHL
t
PLH
t
PHL
t
PZH
t
PZL
t
PHZ
t
PLZ
C
IN
Propagation Delay, Nibble A or B to
Output Y (Figure 1)
Propagation Delay, Nibble A or B to
Output Y (Figure 1)
Propagation Delay, Select to Output Y (Figure
2)
Propagation Delay, Select to Output Y (Figure
2)
Propagation Delay, Output Enable to
Output Y (Figure 3)
Propagation Delay, Output Enable to
Output Y (Figure 3)
Propagation Delay, Output Enable to
Output Y (Figure 3)
Propagation Delay, Output Enable to
Output Y (Figure 3)
Maximum Input Capacitance
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
5.0
1.5
1.5
1.5
1.5
1.5
1.5
1.5
1.5
1.5
1.5
1.5
1.5
1.5
1.5
1.5
1.5
4.5
Max
8.5
6.0
8.5
6.0
10.5
7.5
10.5
7.5
9.5
7.5
9.0
8.5
10.0
9.0
9.0
8.0
-40°C to
85°C
Min
1.0
1.0
1.0
1.0
1.5
1.0
1.5
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
4.5
Max
9.0
7.0
9.0
7.0
11.5
8.5
11.5
8.5
10.5
8.5
10.0
9.5
11.0
10.0
10.0
9.0
ns
ns
ns
ns
ns
ns
ns
ns
pF
Unit
Typical @25°C,V
CC
=5.0 V
C
PD
*
Power Dissipation Capacitance
50
pF
Voltage Range 3.3 V is 3.3 V
±0.3
V
Voltage Range 5.0 V is 5.0 V
±0.5
V
Figure 1. Switching Waveforms
Figure 2. Switching Waveforms
Rev. 00
IKSEMICON [ IK SEMICON CO., LTD ]
