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January 18, 2011

CPS-10Q

CPS-10Q Datasheet

2010 Integrated Device Technology, Inc. All rights reserved.

Explanatory Note on Transmitter and Receiver Specifications

AC electrical specifications are given for transmitter and receiver. Long run and short run interfaces at three baud rates (a total of six cases) are

described.

The parameters for the AC electrical specifications are guided by the XAUI electrical interface specified in Clause 47 of IEEE 802.3ae-2002.

XAUI has similar application goals to serial RapidIO. The goal of this standard is that electrical designs for serial RapidIO can reuse electrical designs

for XAUI, suitably modified for applications at the baud intervals and reaches described herein.

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 Ohm resistive. Differential return loss includes contributions from on-

chip circuitry, chip packaging and any off-chip components related to the driver. The output impedance requirement applies to all valid output levels.

The CPS-10Q satisfies the specification requirement that the 20%-80% rise/fall time of the transmitter, as measured at the transmitter output, in each

case has a minimum value 60 ps.

Similarly the timing skew at the output of an LP-Serial transmitter between the two signals that comprise a differential pair does not exceed 25 ps at

1.25 GB, 20 ps at 2.50GB and 15 ps at 3.125 GB.

Symbol

Parameter

Range

Unit

Notes

Min

Max

VO

Output Voltage

-0.40

2.30

Volts

Voltage relative to COMMON of either

signal comprising a differential pair.

VODIFF PP

Differential Output Voltage

500

1000

mV p-p

JD

Deterministic Jitter

-

0.17

UI p-p

JT

Total Jitter

-

0.35

UI p-p

SMO

Multiple Output Skew

-

1000

ps

Skew at the transmitter output between

lanes of a multilane link

UI

Unit Interval

800

800

ps

+/- 100 ppm

Table 17 Short Run Transmitter AC Timing Specifications - 1.25 GBaud

Symbol

Parameter

Range

Unit

Notes

Min

Max

VO

Output Voltage

-0.40

2.30

Volts

Voltage relative to COMMON of either

signal comprising a differential pair.

VODIFF PP

Differential Output Voltage

500

1000

mV p-p

JD

Deterministic Jitter

-

0.17

UI p-p

JT

Total Jitter

-

0.35

UI p-p

SMO

Multiple Output Skew

-

1000

ps

Skew at the transmitter output between

lanes of a multilane link

UI

Unit Interval

400

400

ps

+/- 100 ppm

Table 18 Short Run Transmitter AC Timing Specifications - 2.5 GBaud