Datasheet

Rev. 0 | Page 60 of 72 | June 2010
ADSP-21469
Figure 51. Typical Output Rise/Fall Time DDR2
(20% to 80%, V
DD_EXT
= Min)
Figure 52. Typical Output Rise/Fall Delay Non-DDR
(V
DD_EXT
= Min)
LOAD CAPACITANCE (pF)
0
RISE AND FALL TIMES (ns)
25 402053510 15 30
3
0
3.5
2
1
0.5
1.5
2.5
4
y = 0.0841x + 0.8997
TYPE C & D HALF DRIVE FALL
y = 0.0617x + 0.7995
TYPE C & D HALF DRIVE RISE
y = 0.0421x + 0.9257
TYPE C & D FULL
DRIVE FALL
TYPE C & D FULL
DRIVE RISE
y = 0.0304x + 0.8204
LOAD CAPACITANCE (pF)
6
0
0
7
4
2
1
3
RISE AND FALL TIMES DELAY (ns)
125 20010025 17550 75 150
5
y = 0.0256x + 3.5876
y = 0.0116x + 3.5697
8
y = 0.0359x + 2.9227
9
10
y = 0.0136x + 3.1135
TYPE A DRIVE FALL
TYPE A DRIVE RISE
TYPE B DRIVE FALL
TYPE B DRIVE RISE
Figure 53. Typical Output Rise/Fall Delay No- DDR
(V
DD_EXT
= Max)
Figure 54. Typical Output Rise/Fall Delay DDR Pad C
(V
DD_EXT
= Min)
LOAD CAPACITANCE (pF)
3
0
3.5
2
1
0.5
1.5
RISE AND FALL DELAY (ns)
2.5
y = 0.0152x + 1.7611
y = 0.0060x + 1.7614
y = 0.0196x + 1.2934
y = 0.0074x + 1.421
0 25 20015050 75 100 125 175
TYPE A FALL
TYPE A RISE
TYPE B RISE
TYPE B FALL
4
4.5
LOAD CAPACITANCE (pF)
0
RISE AND FALL DELAY (ns)
252053510 15 30
TYPE C HALF DRIVE (FALL)
y = 0.0122x + 2.0405
TYPE C HALF DRIVE (RISE)
y = 0.0079x + 2.0476
TYPE C FULL DRIVE (RISE & FALL)
y = 0.0023x + 1.9472
2.4
2.6
1.8
1.6
1.4
2.8
2.2
2.0
3.0