TMS320VC549 datasheet(29/64 Pages) TI

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TMS320VC549

FIXEDPOINT DIGITAL SIGNAL PROCESSOR

SPRS078G − SEPTEMBER 1998 − REVISED OCTOBER 2004

POST OFFICE BOX 1443

• HOUSTON, TEXAS 77251−1443

I/O timing variation with load capacitance: SPICE simulation results (continued)

Table 1. Timing Variation With Load Capacitance: [2.7 V] 10% − 90%

WEAK

NOMINAL

STRONG

RISE

FALL

RISE

FALL

RISE

FALL

0 pF

0.476 ns

0.457 ns

0.429 ns

0.391 ns

0.382 ns

0.323 ns

10 pF

1.511 ns

1.278 ns

1.386 ns

1.148 ns

1.215 ns

1.049 ns

20 pF

2.551 ns

2.133 ns

2.350 ns

1.956 ns

2.074 ns

1.779 ns

30 pF

3.614 ns

3.011 ns

3.327 ns

2.762 ns

2.929 ns

2.512 ns

40 pF

4.664 ns

3.899 ns

4.394 ns

3.566 ns

3.798 ns

3.264 ns

50 pF

5.752 ns

4.786 ns

5.273 ns

4.395 ns

4.655 ns

4.010 ns

60 pF

6.789 ns

5.656 ns

6.273 ns

5.206 ns

5.515 ns

4.750 ns

70 pF

7.817 ns

6.598 ns

7.241 ns

6.000 ns

6.442 ns

5.487 ns

80 pF

8.897 ns

7.531 ns

8.278 ns

6.928 ns

7.262 ns

6.317 ns

90 pF

10.021 ns

8.332 ns

9.152 ns

7.735 ns

8.130 ns

7.066 ns

100 pF

11.072 ns

9.299 ns

10.208 ns

8.537 ns

8.997 ns

7.754 ns

Table 2. Timing Variation With Load Capacitance: [3 V] 10% − 90%

WEAK

NOMINAL

STRONG

RISE

FALL

RISE

FALL

RISE

FALL

0 pF

0.436 ns

0.387 ns

0.398 ns

0.350 ns

0.345 ns

0.290 ns

10 pF

1.349 ns

1.185 ns

1.240 ns

1.064 ns

1.092 ns

0.964 ns

20 pF

2.273 ns

1.966 ns

2.098 ns

1.794 ns

1.861 ns

1.634 ns

30 pF

3.226 ns

2.765 ns

2.974 ns

2.539 ns

2.637 ns

2.324 ns

40 pF

4.168 ns

3.573 ns

3.849 ns

3.292 ns

3.406 ns

3.013 ns

50 pF

5.110 ns

4.377 ns

4.732 ns

4.052 ns

4.194 ns

3.710 ns

60 pF

6.033 ns

5.230 ns

5.660 ns

4.811 ns

5.005 ns

4.401 ns

70 pF

7.077 ns

5.997 ns

6.524 ns

5.601 ns

5.746 ns

5.117 ns

80 pF

8.020 ns

6.899 ns

7.416 ns

6.336 ns

6.559 ns

5.861 ns

90 pF

8.917 ns

7.709 ns

8.218 ns

7.124 ns

7.323 ns

6.498 ns

100 pF

9.885 ns

8.541 ns

9.141 ns

7.830 ns

8.101 ns

7.238 ns

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