MCIMX503CVM8B datasheet(46/134 Pages) FREESCALE

46 / 134 page

i.MX50 Applications Processors for Consumer Products, Rev. 2

Freescale Semiconductor

Electrical Characteristics

4.5.8

LPDDR1 I/O AC Parameters

Table 33 shows the AC parameters for LPDDR1 I/O.

4.5.9

LPDDR2 I/O AC Parameters

Table 34 shows the AC parameters for LPDDR2 I/O.

Table 33. LPDDR1 I/O AC Parameters

Parameter

Symbol

Min

Max

Unit

AC input logic high

Vihd(ac)

0.8*ovdd

ovdd+0.3

AC input logic low

Vild(ac)

-0.3

0.2*ovdd

AC input differential 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)

0.6*ovdd

ovdd+0.6

AC input differential crosspoint 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)

0.4*ovdd

0.6*ovdd

Output propagation delay high to low

tPOHLD

2.5

Output propagation delay low to high

tPOLHD

2.5

Input propagation delay high to low

tPIHLD

1.5

Input propagation delay low to high

tPILHD

1.5

Single output slew rate

tsr

0.3

2.5

V/ns

Table 34. LPDDR2 I/O AC Parameters

Parameter

Symbol

Min

Max

Unit

AC input logic high

Vih(ac)

Vref+0.22

ovdd

AC input logic low

Vil(ac)

ovss

Vref-0.22

AC differential input high voltage1

Vidh(ac)

0.44

AC differential input low voltage

Vidhl(ac)

0.44

AC input differential cross point voltage (relative

to ovdd / 2)2

Vix(ac)

-0.12

0.12

Over/undershoot peak

Vpeak

0.35

Over/undershoot area (above OVDD or below

OVSS)

Varea

0.6 (at 266

MHz)

V-ns

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

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