Table of Contents

Revision 4.01/June 2006 © Semtech Corp.

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ACS8526 LC/P LITE

Section

Page

ADVANCED COMMUNICATIONS

FINAL

DATASHEET

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

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

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

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

Pin Diagram ............................................................................................................................................................................................... 3

Pin Description........................................................................................................................................................................................... 4

Introduction................................................................................................................................................................................................ 6

General Description................................................................................................................................................................................... 6

Inputs..................................................................................................................................................................................................6

Preconfiguring Inputs - Expected Input Frequency ................................................................................................................ 7

Preconfiguring Inputs- SONET/SDH ........................................................................................................................................ 7

Input Locking Frequency Modes ............................................................................................................................................. 7

Selection of Input SECs .....................................................................................................................................................................8

Initialization .............................................................................................................................................................................. 8

SEC Selection - SRCSW pin...................................................................................................................................................... 8

Output Clock Phase Continuity on Source Switchover .......................................................................................................... 8

Activity Monitors.................................................................................................................................................................................9

SEC Activity Monitors ............................................................................................................................................................... 9

Fast Activity Monitor.............................................................................................................................................................. 10

Phase Locked Loops (PLLs) ........................................................................................................................................................... 10

PLL Overview ......................................................................................................................................................................... 10

PLL Architecture .................................................................................................................................................................... 11

PLL Operational Controls ...................................................................................................................................................... 14

DPLL Feature Summary ........................................................................................................................................................ 16

Outputs ............................................................................................................................................................................................ 17

Output Frequency Selection by Hardware ........................................................................................................................... 17

Output Frequency Selection by Register Programming...................................................................................................... 17

Power-On Reset............................................................................................................................................................................... 25

Local Oscillator Clock...................................................................................................................................................................... 27

Crystal Frequency Calibration............................................................................................................................................... 27

Status Reporting ............................................................................................................................................................................. 27

Loss of Input Signal - LOS Flag............................................................................................................................................. 27

Status Information ................................................................................................................................................................ 27

Serial Interface................................................................................................................................................................................ 27

Register Map........................................................................................................................................................................................... 30

Register Organization ..................................................................................................................................................................... 30

Multi-word Registers ............................................................................................................................................................. 30

Register Access ..................................................................................................................................................................... 30

Flags....................................................................................................................................................................................... 30

Defaults.................................................................................................................................................................................. 30

Register Descriptions ............................................................................................................................................................................. 32

Electrical Specifications ......................................................................................................................................................................... 61

JTAG ................................................................................................................................................................................................. 61

Over-voltage Protection .................................................................................................................................................................. 61

ESD Protection ................................................................................................................................................................................ 61

Latchup Protection.......................................................................................................................................................................... 61

Maximum Ratings ........................................................................................................................................................................... 62

Operating Conditions ...................................................................................................................................................................... 62

Jitter Performance .......................................................................................................................................................................... 65

Input/Output Timing ....................................................................................................................................................................... 67

Package Information .............................................................................................................................................................................. 68

Thermal Conditions......................................................................................................................................................................... 69

Application Information .......................................................................................................................................................................... 70

References.............................................................................................................................................................................................. 71

Abbreviations .......................................................................................................................................................................................... 71

Notes ....................................................................................................................................................................................................... 72

Trademark Acknowledgements ............................................................................................................................................................. 72

Revision Status/History ......................................................................................................................................................................... 73

Ordering Information .............................................................................................................................................................................. 74

Disclaimers...................................................................................................................................................................................... 74

Contacts........................................................................................................................................................................................... 74

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