HD74AC 데이터 시트보기 (PDF) - Hitachi -> Renesas Electronics

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HD74AC

HD74AC Series Common Information

Hitachi -> Renesas Electronics 

FACT Descriptions and Family Characteristics

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

Trise

31

22

t fall

18

13

Note: TA = 25˚C

5.5

Units

19

ps/pF

12.5

ps/pF

The two graphs following, figures 11 and 12, describe propagation delays on FACT devices as affected by

variations in power supply voltage (VCC) and lumped load capacitance (CL). Figures 13 and 14 show the

effects of lumped load capacitance on rise and fall times for FACT devices.

Delay (ns)

32

30

28

26

CL = 1000 pF, tPLH

24

22

20

18

16

CL

CL

=

=

1407000ppFF, ,tPtLPHHL

14

12

CL = 470 pF, tPHL

10

8

CL = 220 pF, tPLH

6

CL = 220 pF, tPHL

4

2

CL = 50 pF, tPHL

CL = 50 pF, tPLH

0

3.0

3.5

4.0

4.5

5.0

5.5

6.0

VCC (Volts)

Figure 11 Propagation Delay vs. VCC (HD74AC00)

13

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