www.fairchildsemi.com 4
74ACT1284
AC Electrical Characteristics
Note 7: Open Drain
Note 8: This parameter is guaranteed but not tested, characterized only.
Note: Pulse Generator for all pulses; Rate ≤ 1.0 MHz; A
O
≤ 50Ω; t
f
≤ 2.5 ns, t
r
≤ 2.5 ns.
Capacitance
Symbol Parameter
T
A
= +25°CT
A
= 0°C to +70°CT
A
= −40°C to +85°C
Units
Figure
Number
V
CC
= 4.7V − 5.5V V
CC
= 4.7V − 5.5V V
CC
= 4.7V − 5.5V
Min Max Min Max Min Max
t
PHL
A
1
- A
7
to B
1
- B
7
2.0 20.0 2.0 20.0 2.0 24.0 ns Figure 1
t
PLH
A
1
- A
7
to B
1
- B
7
2.0 20.0 2.0 20.0 2.0 24.0 ns Figure 2
t
PHL
B
1
- B
4
to A
1
- A
4
2.0 20.0 2.0 20.0 2.0 24.0 ns Figure 3
t
PLH
B
1
- B
4
to A
1
- A
4
2.0 20.0 2.0 20.0 2.0 24.0 ns Figure 3
t
pEnable
Output Enable Time
2.0 20.0 2.0 20.0 2.0 24.0 ns Figure 2
HD to B
1
- B
7
t
pDisable
Output Disable Time
2.0 20.0 2.0 20.0 2.0 24.0 ns Figure 2
HD to B
1
- B
7
t
SKEW
Output Slew Rate
0.05 0.40 0.05 0.40 0.05 0.40 V/ns
Figures
1, 2
t
PLH
B
1
- B
7
t
PHL
t
r
, t
f
t
RISE
and t
FALL
120 120 120 ns
Figure 4
B
1
- B
7
(Note 7) (Note 8)
Symbol Parameter Typ Units Conditions
C
IN
Input Capacitance 4.0 pF V
CC
= OPEN (HD, DIR A
5
- A
7
)
C
I/O
I/O Pin Capacitance 12.0 pF V
CC
= 5.0V