Revision 2.01/December 2005

Semtech Corp.

www.semtech.com

2

ACS8515 Rev2.1 LC/P

ADVANCED COMMUNICATIONS

FINAL

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List of Sections

List of Sections

List of Sections

List of Sections

List of Sections

Description ................................................................................................................................................................................................ 1

Block Diagram ........................................................................................................................................................................................... 1

Features ..................................................................................................................................................................................................... 1

Table of Contents ...................................................................................................................................................................................... 2

Pin Diagram ............................................................................................................................................................................................... 4

Pin Descriptions ........................................................................................................................................................................................ 5

Functional Description ............................................................................................................................................................................. 7

Local Oscillator Clock ..................................................................................................................................................................................... 7

Crystal Frequency Calibration ........................................................................................................................................................ 7

Input Reference Clock Ports ......................................................................................................................................................................... 8

Input Wander and Jitter Tolerance ............................................................................................................................................................ 10

Output Clock Ports ........................................................................................................................................................................................ 11

Low Speed Output Clock ................................................................................................................................................................ 11

High Speed Output Clock .............................................................................................................................................................. 12

Frame Sync and Multi-Frame Sync Clocks ................................................................................................................................ 12

Low Jitter Multiple E1/DS1 Outputs ........................................................................................................................................... 12

Output Wander and Jitter ............................................................................................................................................................................ 13

Phase Variation ............................................................................................................................................................................................. 14

Phase Build Out ............................................................................................................................................................................................. 16

Microprocessor Interface ............................................................................................................................................................................. 16

Register Set ..................................................................................................................................................................................... 16

Configuration Registers ................................................................................................................................................................. 16

Status Registers .............................................................................................................................................................................. 16

Register Access ............................................................................................................................................................................... 17

Interrupt Enable and Clear ......................................................................................................................................................................... 17

Register Map .................................................................................................................................................................................................. 18

Register Map Description ........................................................................................................................................................................... 21

Selection of Input Reference Clock Source ............................................................................................................................................. 29

Automatic Control Selection ........................................................................................................................................................ 29

Ultra Fast Switching ....................................................................................................................................................................... 30

External Protection Switching ..................................................................................................................................................... 30

Activity Monitoring ....................................................................................................................................................................................... 30

Modes of Operation ...................................................................................................................................................................................... 32

Free-run Mode ................................................................................................................................................................................. 32

Pre-Locked Mode ............................................................................................................................................................................ 32

Locked Mode .................................................................................................................................................................................... 32

Lost-Phase Mode ............................................................................................................................................................................. 33

Holdover Mode ................................................................................................................................................................................ 33

Pre-Locked(2) Mode ........................................................................................................................................................................ 33

Power On Reset - PORB ............................................................................................................................................................................... 33

Electrical Specification .......................................................................................................................................................................... 35

Serial Microprocessor Interface Timing ............................................................................................................................................... 44

Package Information .............................................................................................................................................................................. 46

Thermal Conditions ....................................................................................................................................................................................... 47

Application Information .......................................................................................................................................................................... 48

Appendix A Rev2.1 Changes Described ............................................................................................................................................... 49

Revision History ...................................................................................................................................................................................... 49

Ordering Information .............................................................................................................................................................................. 50

Disclaimers ..................................................................................................................................................................................................... 50