XRT73L03IV datasheet(11/62 Pages) EXAR

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3 CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT

XRT73L03

PRELIMINARY

REV. P1.0.13

EXClk1

External Reference Clock Input - Channel 1:

Apply a 34.368 MHz clock signal for E3 applications, a 44.736 MHz clock sig-

nal for DS3 applications or a 51.84 MHz clock signal for SONET STS-1 appli-

cations.

The Clock Recovery PLL in Channel 1 uses this signal as a Reference Signal

for Declaring and Clearing the Receive Loss of Lock Alarm.

NOTES:

1. It is permissible to use the same clock which is also driving the TxClk

input pin.

2. It is permissible to operate the three Channels at different data rates.

RxDVDD1

****

Receive Digital 3.3V+ 5% VDD (for Receiver 1):

RxClk1

Receive Clock Output - Channel 1:

Refer to the description of pin 43, RxClk3

RNEG1

Receive Negative Data Output - Channel 1:

Refer to the description of pin 44, RNEG3

RPOS1

Receive Positive Data Output - Channel 1:

Refer to the description of pin 45, RPOS3

No Connection

RxDGND1

****

Receive Digital GND - Channel 1:

RLOS1

Receive Loss of Signal Output Indicator - Channel 1:

This output pin toggles "High" if Channel 1 in the XRT73L03 has detected a

Loss of Signal Condition in the incoming line signal.

The criteria the XRT73L03 uses to declare an LOS Condition depends upon

whether it is operating in the E3 or STS-1/DS3 Mode.

LCV1

Line Code Violation Indicator - Channel 1:

Whenever the Receive Section of Channel 1 detects a Line Code Violation, it

pulses this output pin "High". This output pin remains "Low" at all other times.

NOTE: The XRT73L03 outputs an NRZ pulse via this output pin. It is advisable

to sample this output pin via the RxClk1 clock output signal.

RLOL1

Receive Loss of Lock Output Indicator - Channel 1:

This output pin toggles "High" if Channel 1 of the XRT73L03 has detected a

Loss of Lock Condition. Channel 1 declares an LOL (Loss of Lock) Condition if

the recovered clock frequency deviates from the Reference Clock frequency

(available at the EXClk(n) input pin) by more than 0.5%.

RLOS3

Receive Loss of Signal Output Indicator - Channel 3:

Refer to the description of pin 55, RLOS1

LCV3

Line Code Violation Indicator - Channel 3:

Refer to the description of pin 56, LCV1

RLOL3

Receive Loss of Lock Output Indicator - Channel 3:

Refer to the description of pin 57, RLOL1

PIN DESCRIPTION

PIN #SIGNAL NAME

TYPE

DESCRIPTION

XRT73L03IV Datasheet(PDF) 11 Page - Exar Corporation

XRT73L03IV Datasheet(HTML) 11 Page - Exar Corporation

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