12

4.1 TRANSMIT TIMING

Note: TXO Output Rise and Fall time is a measure of the transition time for all MLT-3 transitions from 10% to 90%. This measurement is conducted directly

at the TXO+/- outputs and does not include the additional bandwidth limiting effects of an isolation transformer. Each of the four possible MLT-3 transitions

is measured (see figure 2 for MLT-3 waveform example). The TXO+/- outputs are configured to switch at a nominal 2V pk-pk differential amplitude into a

standard 50

Ω differential load. Device configuration: LBEN=0, CDET=0, ENCSEL=0, EQSEL=float, PMRD+/-=125Mb/s data, RXI+/-=static.

CDET=0, ENCSEL=0, EQSEL=float, PMRD+/-=125Mb/s data, RXI+/-=static.

Note: : The Transmit channel propagation delay is a measure of the time delay imposed on the transmit data as it passes from the PMRD+/- inputs to the

TXO+/- outputs. Device configuration: LBEN=0, CDET=0, ENCSEL=0, EQSEL=float, PMRD+/-=125Mb/s data, RXI+/-=static.

Note: Transmit Jitter is a measure of the total jitter as measured differentially across the TXO+/- outputs of the device. This includes the cumulative effect

of Duty Cycle Distortion (DCD), Data Dependent Jitter (DDJ), and Random Jitter (RJ). Device configuration: LBEN=0, CDET=0, ENCSEL=0, EQSEL=float,

PMRD+/-=125Mb/s data (pseudo random ^15), RXI+/-=125Mb/s data in order to induce a worst case system level noise environment.

Note: T1.1, T1.2 and T1.4 are guaranteed by characterization over process, temperature, and Vcc.

4.2 RECEIVE PROPAGATION DELAY

Note: The Receive channel propagation delay is a measure of the time delay imposed on the receive data as it passes from the RXI+/- inputs to the PMID+/-

outputs. This measurement is taken after the device has had sufficient time for the receive adaptive equalizer to converge. Device configuration: LBEN=0,

CDET=0, ENCSEL=0, EQSEL=float, PMRD+/-=static, RXI+/-=125Mb/s data.

Number

Parameter

Min

Typ

Max

Units

T1.1

TXO Output Rise and Fall

2.25

2.75

3.25

ns

T1.2

TXO Rise / Fall Symmetry

500

ps

T1.3

TX prop delay

7

ns

T1.4

Transmit Jitter

1.4

ns

Number

Parameter

Min

Typ

Max

Units

T2.1

Receive Propagation Delay

7

ns

T2.1

RXI+

RXI-

PMID+

PMID-

PMRD+

PMRD-

TXO+

TXO-

T1.3

T1.1

10% - 90%

T1.1

1

0

-1

TXO-

TXO+