HD74AC HITACHI [Hitachi Semiconductor], HD74AC Datasheet - Page 14

• Manufacturer Part Number: HD74AC
• Description: HD74AC Series Common Information
• Manufacturer: HITACHI [Hitachi Semiconductor]

2.2 Capacitive Loading Effects
In addition to temperature and power supply effects, capacitive loading effects for loads greater than 50 pF
should be taken into account for propagation delays of FACT devices. Minimum delay numbers may be
determined from table 3. Propagation delays are measured to the 50% point of the output waveform.
Table 3 Minimum Propagation Delay
Parameter
T
t
Note:
The two graphs following, figures 11 and 12, describe propagation delays on FACT devices as affected by
variations in power supply voltage (V
effects of lumped load capacitance on rise and fall times for FACT devices.
fall
rise
TA = 25˚C
Voltage(V)
3.0
31
18
Figure 11 Propagation Delay vs. V
32
30
28
26
24
22
20
18
16
14
12
10
8
6
4
2
0
3.0
Delay (ns)
FACT Descriptions and Family Characteristics
3.5
CC
) and lumped load capacitance (C
4.5
22
13
4.0
V
CC
4.5
(Volts)
5.0
CC
5.5
19
12.5
(HD74AC00)
5.5
L
). Figures 13 and 14 show the
6.0
Units
ps/pF
ps/pF
13