MCIMX503CVM8B datasheet(46/136 Pages) NXP

46 / 136 page

i.MX50 Applications Processors for Consumer Products, Rev. 7

Electrical Characteristics

Freescale Semiconductor

4.5.7

DDR2 I/O AC Parameters

Table 33 shows the AC parameters for DDR2 I/O.

Table 33. DDR2 I/O AC Parameters

Parameter

Symbol

Min

Max

Unit

AC input logic high

Vih(ac)

Vref+0.25

AC input logic low

Vil(ac)

Vref-0.25

AC differential input voltage1

1Vid(ac) specifies the input differential voltage |Vtr-Vcp| required for switching, where Vtr is the

“true” input signal and Vcp is the “complementary” input signal. The Minimum value is equal to

Vih(ac)-Vil(ac)

Vid(ac)

0.5

ovdd

AC Input differential cross point voltage2

2The typical value of Vix(ac) is expected to be about 0.5*OVDD. and Vix(ac) is expected to track

variation of OVDD. Vix(ac) indicates the voltage at which differential input signal must cross.

Vix(ac)

0.5*ovdd

-0.175

0.5*ovdd +

0.175

AC output differential cross point voltage 3

3The typical value of Vox(ac) is expected to be about 0.5*OVDD and Vox(ac) is expected to track

variation in OVDD. Vox(ac) indicates the voltage at which differential output signal must cross.

Vox(ac)

0.5*ovdd

-0.125

0.5*ovdd+

0.125

Output propagation delay high to low

tPOHLD

3.5

Output propagation delay low to high

tPOLHD

3.5

Input propagation delay high to low

tPIHLD

1.5

Input propagation delay low to high

tPILHD

1.5

Single output slew rate

tsr

0.4

V/ns

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