XRT75L04D Datasheet, PDF (4/98 Pages) Exar Corporation – FOUR CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT WITH SONET DESYNCHRONIZER

XRT75L04D
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FOUR CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT WITH SONET DESYNCHRONIZER REV. 1.0.1
TABLE OF CONTENTS
GENERAL DESCRIPTION.............................................................................................................. 1
FEATURES ..................................................................................................................................................................... 1
APPLICATIONS ............................................................................................................................................................... 1
TRANSMIT INTERFACE CHARACTERISTICS ....................................................................................................................... 2
RECEIVE INTERFACE CHARACTERISTICS ......................................................................................................................... 2
FIGURE 1. BLOCK DIAGRAM OF THE XRT 75L04D .................................................................................................................................. 2
FIGURE 2. PIN OUT OF THE XRT75L04D................................................................................................................................................ 3
ORDERING INFORMATION.....................................................................................................................3
PIN DESCRIPTIONS (BY FUNCTION) .......................................................................................... 4
TRANSMIT INTERFACE .................................................................................................................................................... 4
RECEIVE INTERFACE ...................................................................................................................................................... 7
CLOCK INTERFACE......................................................................................................................................................... 9
................................................................................................................................................................................... 10
CONTROL AND ALARM INTERFACE...................................................................................................................... 10
OPERATING MODE SELECT.......................................................................................................................................... 12
................................................................................................................................................................................... 13
SERIAL MICROPROCESSOR INTERFACE ......................................................................................................................... 13
................................................................................................................................................................................... 14
JITTER ATTENUATOR INTERFACE .................................................................................................................................. 14
ANALOG POWER AND GROUND .................................................................................................................................... 14
DIGITAL POWER AND GROUND...................................................................................................................................... 16
1.0 ELECTRICAL CHARACTERISTICS ....................................................................................................17
TABLE 1: ABSOLUTE MAXIMUM RATINGS ............................................................................................................................................... 17
TABLE 2: DC ELECTRICAL CHARACTERISTICS:....................................................................................................................................... 17
2.0 TIMING CHARACTERISTICS ..............................................................................................................18
FIGURE 3. TYPICAL INTERFACE BETWEEN TERMINAL EQUIPMENT AND THE XRT75L04D (DUAL-RAIL DATA) .............................................. 18
FIGURE 4. TRANSMITTER TERMINAL INPUT TIMING................................................................................................................................. 18
FIGURE 5. RECEIVER DATA OUTPUT AND CODE VIOLATION TIMING .......................................................................................................... 19
FIGURE 6. TRANSMIT INTERFACE CIRCUIT FOR E3, DS3 AND STS-1 RATES ........................................................................................... 19
3.0 LINE SIDE CHARACTERISTICS: ........................................................................................................20
3.1 E3 LINE SIDE PARAMETERS: ...................................................................................................................... 20
FIGURE 7. PULSE MASK FOR E3 (34.368 MBITS/S) INTERFACE AS PER ITU-T G.703 ............................................................................... 20
TABLE 3: E3 TRANSMITTER LINE SIDE OUTPUT AND RECEIVER LINE SIDE INPUT SPECIFICATIONS .............................................................. 20
FIGURE 8. BELLCORE GR-253 CORE TRANSMIT OUTPUT PULSE TEMPLATE FOR SONET STS-1 APPLICATIONS ................................... 21
TABLE 4: STS-1 PULSE MASK EQUATIONS ........................................................................................................................................... 21
TABLE 5: STS-1 TRANSMITTER LINE SIDE OUTPUT AND RECEIVER LINE SIDE INPUT SPECIFICATIONS (GR-253)..................................... 22
FIGURE 9. TRANSMIT OUPUT PULSE TEMPLATE FOR DS3 AS PER BELLCORE GR-499 ........................................................................... 22
TABLE 6: DS3 PULSE MASK EQUATIONS............................................................................................................................................... 23
TABLE 7: DS3 TRANSMITTER LINE SIDE OUTPUT AND RECEIVER LINE SIDE INPUT SPECIFICATIONS (GR-499) ........................................ 23
FIGURE 10. MICROPROCESSOR SERIAL INTERFACE STRUCTURE ............................................................................................................ 24
FIGURE 11. TIMING DIAGRAM FOR THE MICROPROCESSOR SERIAL INTERFACE ....................................................................................... 24
TABLE 8: MICROPROCESSOR SERIAL INTERFACE TIMINGS ( TA = 250C, VDD=3.3V± 5% AND LOAD = 10PF) ........................................ 25
FUNCTIONAL DESCRIPTION:..................................................................................................... 26
4.0 THE TRANSMITTER SECTION: ..........................................................................................................26
4.1 TRANSMIT CLOCK: ....................................................................................................................................... 26
FIGURE 12. SINGLE-RAIL OR NRZ DATA FORMAT (ENCODER AND DECODER ARE ENABLED) .................................................................. 26
FIGURE 13. DUAL-RAIL DATA FORMAT (ENCODER AND DECODER ARE DISABLED).................................................................................... 26
4.2 B3ZS/HDB3 ENCODER: ................................................................................................................................. 27
4.2.1 B3ZS ENCODING: ...................................................................................................................................................... 27
4.2.2 HDB3 ENCODING:...................................................................................................................................................... 27
FIGURE 14. B3ZS ENCODING FORMAT ................................................................................................................................................. 27
FIGURE 15. HDB3 ENCODING FORMAT ................................................................................................................................................. 27
4.3 TRANSMIT PULSE SHAPER: ........................................................................................................................ 28
4.3.1 GUIDELINES FOR USING TRANSMIT BUILD OUT CIRCUIT: ................................................................................. 28
4.3.2 INTERFACING TO THE LINE: .................................................................................................................................... 28
4.4 TRANSMIT DRIVE MONITOR: ....................................................................................................................... 28
FIGURE 16. TRANSMIT DRIVER MONITOR SET-UP................................................................................................................................... 28
4.5 TRANSMITTER SECTION ON/OFF: .............................................................................................................. 29
5.0 THE RECEIVER SECTION: .................................................................................................................30
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