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XRT75L00IV Datasheet(PDF) 4 Page - Exar Corporation |
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XRT75L00IV Datasheet(HTML) 4 Page - Exar Corporation |
4 / 50 page XRT75L00 E3/DS3/STS-1 LINE INTERFACE UNIT WITH JITTER ATTENUATOR REV. 1.0.2 I 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 75L00 ..................................................................................................................................... 2 JITTER ATTENUATORS.................................................................................................................................................... 3 FIGURE 2. PIN OUT OF THE XRT75L00 .................................................................................................................................................. 3 ORDERING INFORMATION .....................................................................................................................3 TABLE OF CONTENTS I PIN DESCRIPTIONS (BY FUNCTION) .......................................................................................... 4 TRANSMIT INTERFACE .................................................................................................................................................... 4 RECEIVE INTERFACE ...................................................................................................................................................... 6 CLOCK INTERFACE......................................................................................................................................................... 8 OPERATING MODE SELECT............................................................................................................................................ 9 CONTROL AND ALARM INTERFACE .................................................................................................................................. 9 MICROPROCESSOR SERIAL INTERFACE - (HOST MODE)......................................................................................... 11 ................................................................................................................................................................................... 13 JITTER ATTENUATOR INTERFACE .................................................................................................................................. 13 ANALOG POWER AND GROUND .................................................................................................................................... 14 DIGITAL POWER AND GROUND .................................................................................................................................... 14 1.0 ELECTRICAL CHARACTERISTICS ....................................................................................................15 TABLE 1: ABSOLUTE MAXIMUM RATINGS ............................................................................................................................................... 15 TABLE 2: DC ELECTRICAL CHARACTERISTICS:....................................................................................................................................... 15 2.0 TIMING CHARACTERISTICS ..............................................................................................................16 FIGURE 3. TYPICAL INTERFACE BETWEEN TERMINAL EQUIPMENT AND THE XRT75L00 (DUAL-RAIL DATA) ................................................. 16 FIGURE 4. TRANSMITTER TERMINAL INPUT TIMING................................................................................................................................. 16 FIGURE 5. RECEIVER DATA OUTPUT AND CODE VIOLATION TIMING .......................................................................................................... 17 FIGURE 6. TRANSMIT PULSE AMPLITUDE TEST CIRCUIT FOR E3, DS3 AND STS-1 RATES ....................................................................... 17 3.0 LINE SIDE CHARACTERISTICS: ........................................................................................................18 3.1 E3 LINE SIDE PARAMETERS: ...................................................................................................................... 18 FIGURE 7. PULSE MASK FOR E3 (34.368 MBITS/S) INTERFACE AS PER ITU-T G.703 ............................................................................... 18 TABLE 3: E3 TRANSMITTER AND RECEIVER LINE SIDE SPECIFICATIONS (TA = 250C AND VDD = 3.3 V ± 5%) .......................................... 18 FIGURE 8. BELLCORE GR-253 CORE TRANSMIT OUTPUT PULSE TEMPLATE FOR SONET STS-1 APPLICATIONS ................................... 19 TABLE 4: STS-1 PULSE MASK EQUATIONS ........................................................................................................................................... 19 TABLE 5: STS-1 TRANSMITTER AND RECEIVER LINE SIDE SPECIFICATIONS (TA = 250C AND VDD =3.3V ± 5%)................................... 20 FIGURE 9. TRANSMIT OUPUT PULSE TEMPLATE FOR DS3 AS PER BELLCORE GR-499 ........................................................................... 20 TABLE 6: DS3 PULSE MASK EQUATIONS............................................................................................................................................... 21 TABLE 7: DS3 TRANSMITTER AND RECEIVER LINE SIDE SPECIFICATIONS (TA = 250C AND VDD = 3.3V ± 5%) ...................................... 21 FIGURE 10. MICROPROCESSOR SERIAL INTERFACE STRUCTURE ............................................................................................................ 22 FIGURE 11. TIMING DIAGRAM FOR THE MICROPROCESSOR SERIAL INTERFACE ....................................................................................... 22 TABLE 8: MICROPROCESSOR SERIAL INTERFACE TIMINGS ( TA = 250C, VDD=3.3V± 5% AND LOAD = 10PF) ........................................ 23 4.0 THE TRANSMITTER SECTION: .........................................................................................................24 4.1 TRANSMIT CLOCK: ....................................................................................................................................... 24 4.2 B3ZS/HDB3 ENCODER: ................................................................................................................................. 24 4.2.1 B3ZS ENCODING: ...................................................................................................................................................... 24 FIGURE 12. SINGLE-RAIL OR NRZ DATA FORMAT (ENCODER AND DECODER ARE ENABLED) .................................................................. 24 FIGURE 13. DUAL-RAIL DATA FORMAT (ENCODER AND DECODER ARE DISABLED).................................................................................... 24 4.2.2 HDB3 ENCODING:...................................................................................................................................................... 25 FIGURE 14. B3ZS ENCODING FORMAT ................................................................................................................................................. 25 FIGURE 15. HDB3 ENCODING FORMAT ................................................................................................................................................. 25 4.3 TRANSMIT PULSE SHAPER: ........................................................................................................................ 26 4.3.1 GUIDELINES FOR USING TRANSMIT BUILD OUT CIRCUIT: ................................................................................. 26 4.3.2 INTERFACING TO THE LINE: .................................................................................................................................... 26 4.4 TRANSMIT DRIVE MONITOR: ....................................................................................................................... 26 4.5 TRANSMITTER SECTION ON/OFF: .............................................................................................................. 27 FIGURE 16. TRANSMIT DRIVER MONITOR SET-UP................................................................................................................................... 27 5.0 THE RECEIVER SECTION ..................................................................................................................28 |
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