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ACS8522BT

Synchronous Equipment Timing Source for Stratum 3/4E/4, SMC and Ethernet Systems

Semtech Corporation 

ACS8522BT eSETS

Synchronous Equipment Timing Source for

Stratum 3/4E/4, SMC and Ethernet Systems

ADVANCED COMMSUN&ICSAETNIOSNINSG

FINAL

DATASHEET

About this Datasheet

Features

Welcome to the datasheet for the Semtech ACS8522BT

eSETS integrated circuit.

The electronic edition of this datasheet contains

hyperlinks that are colored blue. Click on a link to navigate

directly to the respective topic.

Description

The ACS8522BT is a highly integrated, single-chip

solution for the Synchronous Equipment Timing Source

(SETS) function in a SONET or SDH network element. The

device generates SONET or SDH Equipment Clocks (SEC),

frame synchronization clocks and Ethernet clocks. The

ACS8522BT is fully compliant with the required

international specifications and standards.

The device supports free-run, locked and holdover modes,

with mode selection controlled automatically by an

internal state machine, or forced by register

configuration.

The ACS8522BT accepts up to four independent input

SEC reference clock sources from Recovered Line Clock,

PDH network, and Node Synchronization. The device

generates independent SEC and BITS clocks, an 8 kHz

Frame Synchronization clock and a 2 kHz Multi-Frame

Synchronization clock (both with programmable pulse

width and polarity) and four Ethernet clocks.

The ACS8522BT includes a serial port which can be SPI

compatible, providing access to the configuration and

status registers for device setup.

 Suitable for Stratum 3, 4E, 4 and SONET Minimum

Clock (SMC) or SONET/SDH Equipment Clock (SEC)

and Ethernet applications.

 Meets Telcordia 1244-CORE Stratum 3 and GR-253,

and ITU-T G.813 Options and and ITU-T G.8262

(Draft) specifications.

 Accepts four individual input reference clocks, all with

robust input clock source quality monitoring.

 Simultaneously generates four output clocks, plus two

Sync pulse outputs.

 Generates four Ethernet frequencies (25 Mhz,

50 MHz, 62.5 MHz and 125 MHz) on any combination

of four TO outputs.

 Absolute holdover accuracy better than 3 x 10-10

(manual), 7.5 x 10-14 (instantaneous); Holdover

stability defined by choice of external XO.

 Programmable PLL bandwidth, for wander and jitter

tracking/attenuation, 0.1 Hz to 70 Hz in 10 steps.

 Automatic hit-less source switchover on loss of input.

 Serial SPI compatible interface.

 Output phase adjustment in 6 ps steps up to ±200 ns.

 IEEE 1149.1 JTAG Boundary Scan.

 Single 3.3 V operation.

 Available in LQFP 64-pin package.

 Lead (Pb)-free, Halogen free, RoHS and WEEE

compliant.

The ACS8522BT supports IEEE 1149.1 JTAG boundary

scan.

References to Standards

Users can choose between OCXO or TCXO to define the

Stratum and/or holdover performance required.

All standards referred to in this datasheet are listed in

References and Associated Documents.

Revision 1.00/April 2010© Semtech Corp.

Page 1

www.semtech.com

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