CS61884

2

DS485PP4

TABLE OF CONTENTS

1. PINOUT - LQFP ........................................................................................................................................ 7

2. PINOUT - FBGA ........................................................................................................................................ 8

3. PIN DESCRIPTIONS ................................................................................................................................. 9

3.1 Power Supplies .................................................................................................................................. 9

3.2 Control .............................................................................................................................................. 10

3.3 Address Inputs/Loopbacks ............................................................................................................... 14

3.4 Cable Select ..................................................................................................................................... 15

3.5 Status ............................................................................................................................................... 15

3.6 Digital Rx/Tx Data I/O ....................................................................................................................... 16

3.7 Analog RX/TX Data I/O .................................................................................................................... 19

3.8 JTAG Test Interface ......................................................................................................................... 21

3.9 Miscellaneous ................................................................................................................................... 21

4. OPERATION ........................................................................................................................................... 22

5. POWER-UP ............................................................................................................................................. 22

6. MASTER CLOCK .................................................................................................................................... 22

7. G.772 MONITORING ............................................................................................................................... 22

8. BUILDING INTEGRATED TIMING SYSTEMS (BITS) CLOCK MODE .................................................. 23

9. TRANSMITTER ....................................................................................................................................... 24

9.1 Bipolar Mode .................................................................................................................................... 25

9.2 Unipolar Mode .................................................................................................................................. 25

9.3 RZ Mode ........................................................................................................................................... 25

9.4 Transmitter Powerdown / High-Z ...................................................................................................... 25

9.5 Transmit All Ones (TAOS) ................................................................................................................ 25

9.6 Automatic TAOS ............................................................................................................................... 26

9.7 Driver Failure Monitor ....................................................................................................................... 26

9.8 Driver Short Circuit Protection .......................................................................................................... 26

10. RECEIVER ............................................................................................................................................ 26

10.1 Bipolar Output Mode ...................................................................................................................... 26

10.2 Unipolar Output Mode .................................................................................................................... 26

10.3 RZ Output Mode ............................................................................................................................. 27

10.4 Receiver Powerdown/High-Z .......................................................................................................... 27

Contacting Cirrus Logic Support

For a complete listing of Direct Sales, Distributor, and Sales Representative contacts, visit the Cirrus Logic web site at:

http://www.cirrus.com/corporate/contacts/sales.cfm

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