XIO2000AI datasheet(146/160 Pages) TI1

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Electrical Characteristics

137

April 2007 Revised October 2008

SCPS155C

7.5

PCI Express Differential Receiver Input Ranges

PARAMETER

TERMINALS

MIN

NOM

MAX

UNITS

COMMENTS

Unit interval

RXP, RXN

399.88

400

400.12

Each UI is 400 ps

±300 ppm. UI does not account for SSC

dictated variations.

See Note 11.

VRX-DIFFp-p

Differential input

peak-to-peak voltage

RXP, RXN

0.175

1.200

VRX-DIFFp-p = 2*|VRXP − VRXN|

See Note 12.

TRX-EYE

Minimum receiver eye

width

RXP, RXN

0.4

The maximum interconnect media and transmitter jitter that

can be tolerated by the receiver is derived as

TRX-MAX- JITTER = 1 − TRX-EYE = 0.6 UI

See Notes 12 and 13.

TRX-EYE-MEDIAN-to-MAX-

JITTER

Maximum time between

the jitter median and

maximum deviation

from the median.

RXP, RXN

0.3

Jitter is defined as the measurement variation of the

crossing points (VRX-DIFFp-p = 0 V) in relation to recovered

TX UI. A recovered TX UI is calculated over

3500 consecutive UIs of sample data. Jitter is measured

using all edges of the 250 consecutive UIs in the center of

the 3500 UIs used for calculating the TX UI.

See Notes 12 and 13.

VRX-CM-ACp

AC peak common mode

input voltage

RXP, RXN

150

VRX-CM-ACp = RMS(|VRXP + VRXN|/2 – VRX-CM-DC)

VRX-CM-DC = DC(avg) of |VRXP + VRXN|/2

See Note 12.

RLRX-DIFF

Differential return loss

RXP, RXN

Measured over 50 MHz to 1.25 GHz with the P and N lines

biased at +300 mV and −300 mV, respectively.

See Note 14.

RLRX-CM

Common mode return

loss

RXP, RXN

Measured over 50 MHz to 1.25 GHz with the P and N lines

biased at +300 mV and −300 mV, respectively.

See Note 14.

ZRX-DIFF-DC

DC differential input

impedance

RXP, RXN

100

120

Ω

RX dc differential mode impedance

See Note 15.

ZRX-DC

DC input impedance

RXP, RXN

Ω

Required RXP as well as RXN dc impedance (50

Ω ±20%

tolerance)

See Notes 12 and 15.

ZRX-HIGH-IMP-DC

Powered down dc input

impedance

RXP, RXN

200K

Ω

Required RXP as well as RXN dc impedance when the

receiver terminations do not have power.

See Note 16.

VRX-IDLE-DET-DIFFp-p

Electrical idle detect

threshold

RXP, RXN

175

VRX-IDLE-DET-DIFFp-p = 2 * |VRXP −VRXN| measured at the

receiver package terminals

TRX-IDLE-DET-DIFF-ENTER

-TIME

Unexpected electrical

idle enter detect

threshold integration

time

RXP, RXN

An unexpected electrical idle

(VRX-DIFFp-p<VRX-IDLE-DET-DIFFp-p) must be recognizedno

longer than TRX-IDLE-DET-DIFF-ENTER-TIME to signal an

unexpected idle condition.

NOTES: 11. No test load is necessarily associated with this value.

12. Specified at the measurement point and measured over any 250 consecutive UIs. A test load must be used as the RX device when

taking measurements. If the clocks to the RX and TX are not derived from the same reference clock, then the TX UI recovered from

3500 consecutive UIs is used as a reference for the eye diagram.

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