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XRT91L31IQ Datasheet(PDF) 5 Page - Exar Corporation |
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XRT91L31IQ Datasheet(HTML) 5 Page - Exar Corporation |
5 / 41 page xr XRT91L31 STS-12/STM-4 OR STS-3/STM-1 SONET/SDH TRANSCEIVER REV. 1.0.2 II 3.5 TRANSMIT PARALLEL INPUT TO SERIAL OUTPUT (PISO) ...................................................................... 25 FIGURE 15. SIMPLIFIED BLOCK DIAGRAM OF PISO ......................................................................................................................... 25 3.6 CLOCK MULTIPLIER UNIT (CMU) AND RE-TIMER ..................................................................................... 26 TABLE 14: CLOCK MULTIPLIER UNIT REQUIREMENTS FOR REFERENCE CLOCK .................................................................................. 26 3.7 LOOP TIMING AND CLOCK CONTROL ....................................................................................................... 27 TABLE 15: LOOP TIMING AND CLOCK RECOVERY CONFIGURATIONS ................................................................................................. 27 FIGURE 16. LOOP TIMING MODE USING INTERNAL CDR OR AN EXTERNAL RECOVERED CLOCK ....................................................... 28 3.8 TRANSMIT SERIAL OUTPUT CONTROL ..................................................................................................... 28 FIGURE 17. TRANSMIT SERIAL OUTPUT INTERFACE BLOCK .............................................................................................................. 28 4.0 DIAGNOSTIC FEATURES ................................................................................................................... 29 4.1 SERIAL REMOTE LOOPBACK ..................................................................................................................... 29 FIGURE 18. SERIAL REMOTE LOOPBACK......................................................................................................................................... 29 4.2 DIGITAL LOCAL LOOPBACK ....................................................................................................................... 29 FIGURE 19. DIGITAL LOCAL LOOPBACK........................................................................................................................................... 29 4.3 ANALOG LOCAL LOOPBACK ...................................................................................................................... 30 FIGURE 20. ANALOG LOCAL LOOPBACK .......................................................................................................................................... 30 4.4 SPLIT LOOPBACK ......................................................................................................................................... 30 FIGURE 21. SPLIT LOOPBACK......................................................................................................................................................... 30 4.5 EYE DIAGRAM ............................................................................................................................................... 31 FIGURE 22. TRANSMIT ELECTRICAL OUTPUT EYE DIAGRAM............................................................................................................. 31 4.6 SONET JITTER REQUIREMENTS ................................................................................................................. 31 4.6.1 JITTER TOLERANCE: ................................................................................................................................................ 31 FIGURE 23. GR-253 JITTER TOLERANCE MASK .............................................................................................................................. 32 TABLE 16: XRT91L31 RECEIVER JITTER TOLERANCE PERFORMANCE............................................................................................. 32 FIGURE 24. XRT91L31 MEASURED JITTER TOLERANCE WITH 77.76MHZ REFERENCE CLOCK ......................................................... 32 FIGURE 25. XRT91L31 MEASURED JITTER TOLERANCE WITH 19.44MHZ REFERENCE CLOCK ......................................................... 33 4.6.2 JITTER TRANSFER .................................................................................................................................................... 33 FIGURE 26. XRT91L31 MEASURED JITTER TRANSFER WITH 77.76MHZ REFERENCE CLOCK ........................................................... 33 FIGURE 27. XRT91L31 MEASURED JITTER TRANSFER WITH 19.44MHZ REFERENCE CLOCK ........................................................... 34 4.6.3 JITTER GENERATION................................................................................................................................................ 34 TABLE 17: XRT91L31 OPTICAL JITTER GENERATION USING 223-1 PRBS PATTERN ........................................................................ 34 TABLE 18: XRT91L31 OPTICAL JITTER GENERATION USING 223-1 PRBS PATTERN USING ALTERNATE STANDARD FILTERS............. 34 5.0 ELECTRICAL CHARACTERISTICS ................................................................................................... 36 ABSOLUTE MAXIMUM RATINGS .................................................................................................................. 36 ABSOLUTE MAXIMUM POWER AND INPUT/OUTPUT RATINGS ......................................................... 36 POWER AND CURRENT DC ELECTRICAL CHARACTERISTICS.................................................................... 36 ................................................................................................................................................................... 36 LVPECL AND LVTTL LOGIC SIGNAL DC ELECTRICAL CHARACTERISTICS...................................... 37 ORDERING INFORMATION .................................................................................................................. 38 PACKAGE DIMENSIONS ................................................................................................ 38 REVISION HISTORY ...................................................................................................................................... 39 |
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