TBD datasheet(43/80 Pages) FREESCALE

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Electrical Characteristics

MSC8144E Quad Core Digital Signal Processor Data Sheet, Rev. 6

Freescale Semiconductor

2.7.5.4

Transmitter Specifications

LP-Serial transmitter electrical and timing specifications are stated in the text and tables of this section. The differential return

loss, S11, of the transmitter in each case shall be better than

•

–10 dB for (baud frequency)/10 < freq(f) < 625 MHz, and

•

–10 dB + 10log(f/625 MHz) dB for 625 MHz

≤ freq(f) ≤ baud frequency

The reference impedance for the differential return loss measurements is 100

Ω resistive. Differential return loss includes

contributions from internal circuitry, packaging, and any external components related to the driver. The output impedance

requirement applies to all valid output levels. It is recommended that the 20–80% rise/fall time of the transmitter, as measured

at the transmitter output, have a minimum value 60 ps in each case. It is also recommended that the timing skew at the output

of an LP-Serial transmitter between the two signals comprising a differential pair not exceed 25 ps at 1.25 GB, 20 ps at 2.50

GB, and 15 ps at 3.125 GB.

Table 30. Short Run Transmitter AC Timing Specifications—1.25 GBaud

Characteristic

Symbol

Range

Unit

Notes

Min

Max

Output Voltage,

–0.40

2.30

Voltage relative to COMMON of either signal

comprising a differential pair

Differential Output Voltage

VDIFFPP

500

1000

mVPP

Deterministic Jitter

0.17

UIPP

Total Jitter

0.35

UIPP

Multiple output skew

SMO

1000

Skew at the transmitter output between lanes of a

multilane link

Unit Interval

800

±100 ppm

Table 31. Short Run Transmitter AC Timing Specifications—2.5 GBaud

Characteristic

Symbol

Range

Unit

Notes

Min

Max

Output Voltage,

–0.40

2.30

Voltage relative to COMMON of either signal

comprising a differential pair

Differential Output Voltage

VDIFFPP

500

1000

mVPP

Deterministic Jitter

0.17

UIPP

Total Jitter

0.35

UIPP

Multiple Output skew

SMO

1000

Skew at the transmitter output between lanes of a

multilane link

Unit Interval

400

±100 ppm

Table 32. Short Run Transmitter AC Timing Specifications—3.125 GBaud

Characteristic

Symbol

Range

Unit

Notes

Min

Max

Output Voltage,

-0.40

2.30

Voltage relative to COMMON of either signal

comprising a differential pair

Differential Output Voltage

VDIFFPP

500

1000

mVPP

Deterministic Jitter

0.17

UIPP

Total Jitter

0.35

UIPP

Multiple output skew

SMO

1000

Skew at the transmitter output between lanes of a

multilane link

Unit Interval

320

±100 ppm

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