XRT85L61

BITS (BUILDING INTEGRATED TIMING SUPPLY) CLOCK EXTRACTOR

REV. 1.0.1

I

TABLE OF CONTENTS

GENERAL DESCRIPTION .................................................................................................1

APPLICATIONS................................................................................................................................................1

FIGURE 1. BLOCK DIAGRAM OF THE XRT85L61 ............................................................................................................................... 1

ORDERING INFORMATION .....................................................................................................................2

FIGURE 2. PIN OUT OF THE XRT85L61............................................................................................................................................ 2

TABLE OF CONTENTS ............................................................................................................I

PIN DESCRIPTIONS ..........................................................................................................3

ELECTRICAL CHARACTERISTICS ..................................................................................6

ABSOLUTE MAXIMUM RATINGS ............................................................................................................. 6

DC Electrical Characteristics ....................................................................................................................6

FUNCTIONAL DESCRIPTION ...........................................................................................7

1.0 OPERATING MODE: ..............................................................................................................................7

1.1 64 KHZ CLOCK MODE: .................................................................................................................................... 7

TABLE 1: OPERATING MODE SELECTION........................................................................................................................................... 7

TABLE 2: G.703 SPECIFICATION FOR THE 64 KHZ CLOCK SIGNAL AT INPUT PORT ............................................................................... 7

1.1.1 64 KHZ + 8 KHZ CLOCK EXTRACTION ...................................................................................................................... 8

1.1.2 64 KHZ + 8 KHZ + 400 HZ CLOCK EXTRACTION ...................................................................................................... 8

TABLE 3: G.703 SPECIFICATION FOR THE 64 KHZ CLOCK SIGNAL AT OUTPUT PORT ............................................................................ 8

FIGURE 3. INPUT DATA 64 KHZ + 8 KHZ OPERATION (S1 = 0, S2 = 0, S3 = 0) ................................................................................... 8

1.2 2048 KHZ RZ E1 MODE ................................................................................................................................... 9

FIGURE 4. INPUT DATA 64 KHZ + 8 KHZ + 400 HZ OPERATION (S1 = 0, S2 = 0, S3 = 1) ................................................................... 9

FIGURE 5. E1 PULSE MASK (G.703) ................................................................................................................................................ 9

TABLE 4: G.703 SPECIFICATION E1................................................................................................................................................ 10

1.3 2048 KHZ NRZ MODE .................................................................................................................................... 11

FIGURE 6. E1 CLOCK SIGNAL WAVE SHAPE - G.703 ...................................................................................................................... 11

TABLE 5: G.703 2048 KHZ CLOCK INTERFACE ............................................................................................................................... 11

1.4 1544 KHZ T1 MODE ....................................................................................................................................... 12

FIGURE 7. G.703 DS1 WAVE FORM............................................................................................................................................... 12

2.0

AIS DETECTION TIMING ....................................................................................................................13

FIGURE 8. AIS DETECTION FOR E1 MODE ...................................................................................................................................... 13

FIGURE 9. AIS DETECTION FOR T1 MODE ...................................................................................................................................... 13

ORDERING INFORMATION ...................................................................................................................14

REVISION HISTORY............................................................................................................................. 15