IMX35 datasheet(30/148 Pages) FREESCALE

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i.MX35 Applications Processors for Automotive Products, Rev. 6

Freescale Semiconductor

4.8.2

AC Electrical Characteristics for DDR Pins (DDR2, Mobile DDR, and

SDRAM Modes)

Output pin slew rate (max. drive)

tps

25 pF

40 pF

50 pF

0.84/1.10

0.68/0.83

0.58/0.72

1.45/1.80

1.14/1.34

0.86/1.10

2.40/2.80

1.88/2.06

1.40/1.70

V/ns

Output pin slew rate (high drive)

tps

25 pF

40 pF

50 pF

0.69/0.96

0.55/0.69

0.40/0.59

1.18/1.50

0.92/1.10

0.67/0.95

1.90/2.30

1.49/1.67

1.10/1.30

V/ns

Output pin slew rate (standard drive)

tps

25 pF

40 pF

50 pF

0.24/0.36

0.37/0.47

0.13/0.21

0.80/1.00

0.62/0.76

0.45/0.65

1.30/1.60

1.00/1.14

0.70/0.95

V/ns

Output pin di/dt (max. drive)

tdit

25 pF

50 pF

124

131

310

324

mA/ns

Output pin di/dt (high drive)

tdit

25 pF

50 pF

290

304

mA/ns

Output pin di/dt (standard

drive)

tdit

25 pF

50 pF

188

198

mA/ns

Table 21. AC Electrical Characteristics of DDR Type IO Pins in DDR2 Mode

Parameter

Symbol

Test Condition

Min.

Rise/Fall

Typ.

Max.

Rise/Fall

Units

Duty cycle

Fduty

—

Clock frequency

—

133

—

MHz

Output pin slew rate

tps

25 pF

50 pF

0.86/0.98

0.46/054

1.35/1.5

0.72/0.81

2.15/2.19

1.12/1.16

V/ns

Output pin di/dt

tdit

25 pF

50 pF

157

167

373

396

mA/ns

Table 22. AC Requirements of DDR2 Pins

Parameter1

1 The Jedec SSTL_18 specification (JESD8-15a) for an SSTL interface for class II operation supersedes any specification in this

document.

Symbol

Min.

Max.

Units

AC input logic high

VIH(ac)

NVCC

÷ 2 + 0.25

NVCC + 0.3

AC input logic low

VIL(ac)

–0.3

NVCC

÷ 2 – 0.25

AC differential cross point voltage for output2

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.

Vox(ac)

NVCC

÷ 2 – 0.125

NVCC

÷ 2 + 0.125

Table 20. AC Electrical Characteristics of GPIO Pins in Fast Slew Rate Mode

[NVCC = 2.25 V–2.75 V] (continued)

Parameter

Symbol

Test

Condition

Min.

Rise/Fall

Typ.

Max.

Rise/Fall

Units Notes

IMX35 Datasheet(PDF) 30 Page - Freescale Semiconductor, Inc

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