ACS8526LC Semtech Corporation, ACS8526LC Datasheet

ACS8526LC

Manufacturer Part Number

ACS8526LC

Description

Line Card Protection Switch for PDH, Sonet or SDH Systems

Manufacturer

Semtech Corporation

Datasheet

1.ACS8526LC.pdf (74 pages)

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The ACS8526 is a highly integrated single-chip solution

for protection switching between two SECs (SDH/SONET

Equipment Clocks) from Master and Slave SETS clock

cards, for line cards in a PDH, SONET or SDH Network

Element. The ACS8526 has fast activity monitors on the

inputs and will raise a flag on a pin if there is a loss of

activity on the currently selected input. The protection

switching between the input reference clock sources is

controlled by an external pin.

The ACS8526 has two SEC reference clock input ports,

configured for expected frequency by setting hardware

pins or by writing to registers via the serial interface.

The ACS8526 can perform frequency translation,

converting, for example, an 8 kHz SEC input clock from a

backplane into a 155.52 MHz clock for local line cards.

The ACS8526 generates two independent SEC clock

outputs, one on a PECL/LVDS port and one on a

TTL/CMOS port, at spot frequencies configured by

hardware pins, or by writing to registers via the serial

interface. The hardware selectable spot frequencies

range from 1.544 MHz up to 155.52 MHz, with further

options for N x E1/DS1 and 311.04 MHz via register

selection. The ACS8526 also provides an 8 kHz Frame

Sync output and 2 kHz Multi-Frame Sync output, both with

programmable pulse width and polarity.

Advanced configuration possibilities are available via the

serial port (which can be SPI compatible), however the

basic configuration of I/O frequencies and SONET/SDH

selection by hardware make the device suitable for

standalone operation, i.e., no need for a microprocessor.

Figure 1 Block Diagram of the ACS8526 LC/P LITE

Revision 4.01/June 2006 © Semtech Corp.

Description

ADVANCED COMMUNICATIONS

Block Diagram

ADVANCED COMMUNICATIONS

2 x SEC TTL inputs

SEC Inputs:

Programmable

Frequencies

N x 8 kHz

1.544 MHz

2.048 MHz

6.48 MHz

19.44 MHz

25.92 MHz

38.88 MHz

51.84 MHz

77.76 MHz

LOS_ALARM

SONSDHB

IP_FREQ

SRCSW

SEC1

SEC2

TRST

TMS

TDO

TCK

TDI

SEC Port

1149.1

Selector

JTAG

Input

IEEE

Generator

TCXO or

Clock

Chip

Digital Feedback

DPLL1

APLL3

Priority

Table

F8526D_001BLOCKDIA_03

Synthesis

E1/DS1

DPLL2

FINAL

Page 1

Line Card Protection Switch for PDH, SONET

Features

Line card protection switch - partners Semtech SETS

devices for Stratum 3E/3/4E/4 PDH, SONET or SDH

applications

High performance DPLL/APLL solution

Output jitter compliant to STM-1

Two independent SEC inputs ports (TTL)

Four independent output ports:

TTL I/O ports: spot frequencies 2 kHz to 77.76 MHz

PECL/LVDS port: spot frequencies 2 kHz to 311 MHz

N x E1/DS1 mode

Programmable pulse width and polarity on Syncs

SONET/SDH frequency translation

Digital Holdover mode on input failure

Separate activity monitors and register alarms on

each input.

“Loss of activity” on selected input flagged on

dedicated pin

Source switch under external hardware control

PLL “Locked” and “Acquisition” bandwidth selectable

from 18, 35 or 70 Hz

Configurable via serial interface or hardware pins

Output clock phase continuity to GR-1244-CORE

Single 3.3 V operation, 5 V I/O compatible

IEEE 1149.1 JTAG Boundary Scan is supported

Operating temperature (ambient) of -40 to +85°C

Available in LQFP 64 package

Lead (Pb)-free version available (ACS8526T), RoHS

and WEEE compliant.

MUX

SPI Compatible

Serial Interface

Port

Two clock ports: one PECL/LVDS, one TTL

Two Syncs (TTL): 8 kHz FrSync & 2 KHz MFrSync

APLL 1

APLL2

OP_FREQ1

OP_FREQ2

Frequency

Selection

ACS8526 LC/P LITE

Output

Port

Output Frequencies/MHz

01 Output:

19.44

25.92

34.368 (E3)

38.88

44.736 (DS3)

51.84

77.76

155.52

SEC Outputs:

01 (LVDS/PECL)

02 (TTL)

Sync Outputs:

MFrSync 2 kHz (TTL)

FrSync 8 kHz (TTL)

or SDH Systems

02 Output:

1.544

2.048

3.088

19.44

25.92

34.368 (E3)

38.88

44.736 (DS3)

51.84

77.76

DATASHEET

www.semtech.com

[13]

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