XRT75R12IB datasheet(29/90 Pages) EXAR

Part #	XRT75R12IB

Description	TWELVE CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT WITH JITTER

PDF	90 Pages

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Manufacturer	EXAR [Exar Corporation]

Direct Link	http://www.exar.com

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29 / 90 page

XRT75R12

REV. 1.0.4

TWELVE CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT WITH JITTER ATTENUATOR

3.6

B3ZS/HDB3 Decoder

The decoder block takes the output from the clock and data recovery block and decodes the B3ZS (for DS3 or

STS-1) or HDB3 (for E3) encoded line signal and detects any coding errors or excessive zeros in the data

stream.

Whenever the input signal violates the B3ZS or HDB3 coding sequence for bipolar violation or

contains three (for B3ZS) or four (for HDB3) or more consecutive zeros, an active “High” pulse is generated on

the RLCV_n output pins to indicate line code violation.

SYMBOL

PARAMETER

MIN

TYP

MAX

UNITS

RxClk

Duty Cycle

RxClk Frequency

DS-3

STS-1

34.368

44.736

51.84

MHz

tRRX

RxClk rise time (10% o 90%)

tFRX

RxClk falling time (10% to 90%)

tCO

RxClk to RPOS/RNEG delay time

tLCVO

RxClk to rising edge of LCV output delay

2.5

XRT75R12IB Datasheet(PDF) 29 Page - Exar Corporation