DS2148 datasheet(3/75 Pages) DALLAS

3 / 75 page

DS2148/Q48

3 of 75

TABLE OF CONTENTS

LIST OF FIGURES............................................................................................................................... 4

LIST OF TABLES ................................................................................................................................ 5

INTRODUCTION................................................................................................................................. 6

3.1

DOCUMENT REVISION HISTORY ............................................................................................ 6

PIN DESCRIPTION ............................................................................................................................. 9

HARDWARE MODE......................................................................................................................... 22

5.1

REGISTER MAP .......................................................................................................................... 23

5.2

PARALLEL PORT OPERATION................................................................................................ 24

5.3

SERIAL PORT OPERATION ...................................................................................................... 24

CONTROL REGISTERS.................................................................................................................... 28

6.1

DEVICE POWER-UP AND RESET ............................................................................................ 31

STATUS REGISTERS ....................................................................................................................... 34

DIAGNOSTICS .................................................................................................................................. 39

8.1

IN-BAND LOOP CODE GENERATION AND DETECTION................................................... 39

8.2

LOOPBACKS ............................................................................................................................... 43

8.2.1

Remote Loopback (RLB)......................................................................................................... 43

8.2.2

Local Loopback (LLB)............................................................................................................ 43

8.2.3

Analog Loopback (LLB) ......................................................................................................... 44

8.2.4

Dual Loopback (DLB) ............................................................................................................ 44

8.3

PRBS GENERATION AND DETECTION ................................................................................. 44

8.4

ERROR COUNTER...................................................................................................................... 44

8.4.1

Error Counter Update ............................................................................................................ 45

8.5

ERROR INSERTION.................................................................................................................... 45

ANALOG INTERFACE ..................................................................................................................... 46

9.1 RECEIVER .................................................................................................................................... 46

9.2

TRANSMITTER ........................................................................................................................... 47

9.3

JITTER ATTENUATOR .............................................................................................................. 47

9.4

G.703 SYNCHRONIZATION SIGNAL ...................................................................................... 48

10. DS21Q48 QUAD LIU......................................................................................................................... 56

11. DC CHARACTERISTICS.................................................................................................................. 60

12. AC CHARACTERISTICS.................................................................................................................. 62

13. MECHANICAL DIMENSIONS......................................................................................................... 71

13.1 MECHANICAL DIMENSIONS—QUAD VERSION................................................................. 73

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