i.MX35 Applications Processors for Industrial and Consumer Products, Rev. 10
Freescale Semiconductor
28
2 The typical value of Vox(ac) is expected to be about 0.5
× NVCC and Vox(ac) is expected to track variation in NVCC. Vox(ac)
indicates the voltage at which the differential output signal must cross. Cload = 25 pF.
Table 24. AC Electrical Characteristics of DDR Type IO Pins in mDDR Mode
Parameter
Symbol
Test Condition
Min.
Rise/Fall
Typ.
Max.
Rise/Fall
Units
Duty cycle
Fduty
—
45
50
55
%
Clock frequency
f
—
133
—
MHz
Output pin slew rate (max. drive)
tps
25 pF
50 pF
0.80/0.92
0.43/0.50
1.35/1.50
0.72/0.81
2.23/2.27
1.66/1.68
V/ns
Output pin slew rate (high drive)
tps
25 pF
50 pF
0.37/0.43
0.19/0.23
0.62/0.70
0.33/0.37
1.03/1.05
0.75/0.77
V/ns
Output pin slew rate (standard drive)
tps
25 pF
50 pF
0.18/0.22
0.10/0.12
0.31/0.35
0.16/0.18
0.51/0.53
0.38/0.39
V/ns
Output pin di/dt (max. drive)
tdit
25 pF
50 pF
64
69
171
183
407
432
mA/ns
Output pin di/dt (high drive)
tdit
25 pF
50 pF
37
39
100
106
232
246
mA/ns
Output pin di/dt (standard drive)
tdit
25 pF
50 pF
18
20
50
52
116
123
mA/ns
Table 25. AC Electrical Characteristics of DDR Type IO Pins in SDRAM Mode
Parameter
Symbol
Test Condition
Min.
Rise/Fall
Min. Clock
Frequency
Max.
Rise/Fall
Units
Clock frequency
f
—
125
—
MHz
Output pin slew rate (max. drive)
tps
25 pF
50 pF
1.11/1.20
0.97/0.65
1.74/1.75
0.92/0.94
2.42/2.46
1.39/1.30
V/ns
Output pin slew rate (high drive)
tps
25 pF
50 pF
0.76/0.80
0.40/0.43
1.16/1.19
0.61/0.63
1.76/1.66
0.93/0.87
V/ns
Output pin slew rate (standard drive)
tps
25 pF
50 pF
0.38/0.41
0.20/0.22
0.59/0.60
0.31/0.32
0.89/0.82
0.47/0.43
V/ns
Output pin di/dt (max. drive)
tdit
25 pF
50 pF
89
94
198
209
398
421
mA/ns
Output pin di/dt (high drive)
tdit
25 pF
50 pF
59
62
132
139
265
279
mA/ns
Output pin di/dt (standard drive)
tdit
25 pF
50 pF
29
31
65
69
132
139
mA/ns