XRT75VL00D datasheet(4/92 Pages) EXAR

4 / 92 page

XRT75VL00D

E3/DS3/STS-1 LINE INTERFACE UNIT WITH SONET DESYNCHRONIZER

REV. 1.0.3

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 75VL00D ................................................................................................. 2

JITTER ATTENUATORS ................................................................................................................................... 3

Figure 2. Pin Out of the XRT75VL00D .............................................................................................................. 3

ORDERING INFORMATION ................................................................................................................... 3

TABLE OF CONTENTS ................................................................................................................................... 1

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

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 XRT75VL00D (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

4.3 TRANSMIT PULSE SHAPER: .............................................................................................................................. 25

Figure 14. B3ZS Encoding Format ................................................................................................................. 25

Figure 15. HDB3 Encoding Format ................................................................................................................. 25

4.3.1 Guidelines for using Transmit Build Out Circuit: ............................................................................ 26

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