參數(shù)資料
型號: HD74AC
廠商: Hitachi,Ltd.
英文描述: HD74AC Series Common Information
中文描述: HD74AC系列通用信息
文件頁數(shù): 14/52頁
文件大小: 220K
代理商: HD74AC
FACT Descriptions and Family Characteristics
13
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
Voltage(V)
Parameter
3.0
4.5
5.5
Units
T
rise
t
fall
Note:
31
22
19
ps/pF
18
13
12.5
ps/pF
TA = 25C
The two graphs following, figures 11 and 12, describe propagation delays on FACT devices as affected by
variations in power supply voltage (V
CC
) and lumped load capacitance (C
L
). Figures 13 and 14 show the
effects of lumped load capacitance on rise and fall times for FACT devices.
Delay (ns)
V
CC
(Volts)
3.0
3.5
4.0
4.5
5.0
5.5
6.0
0
2
4
6
8
10
12
14
16
18
20
22
24
26
28
30
32
C
L
= 1000 pF, t
PLH
C
L
= 1000 pF, t
PHL
C
L
= 470 pF, t
PLH
C
L
= 470 pF, t
PHL
C
L
= 220 pF, t
PLH
C
L
= 50 pF, t
PHL
C
L
= 50 pF, t
PLH
C
L
= 220 pF, t
PHL
Figure 11 Propagation Delay vs. V
CC
(HD74AC00)
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