DS3105 datasheet(1/120 Pages) MAXIM

Part #	DS3105

Description	Line Card Timing IC

PDF	120 Pages

Scroll/Zoom	100%

Manufacturer	MAXIM [Maxim Integrated Products]

Direct Link	https://www.maximintegrated.com/en.html

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Maxim Integrated Products

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Some revisions of this device may incorporate deviations from published specifications known as errata. Multiple revisions of

any device may be simultaneously available through various sales channels. For information about device errata, go to:

www.maxim-ic.com/errata. For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or

visit Maxim’s website at www.maxim-ic.com.

DS3105

Line Card Timing IC

General Description

The DS3105 is a low-cost, feature-rich timing IC for

telecom line cards. Typically, the device accepts two

reference clocks from dual redundant system timing

cards. The DS3105 continually monitors both inputs

and performs automatic hitless reference switching if

the primary reference fails. The highly programmable

DS3105 supports numerous input and output

frequencies

including

frequencies

required

for

SONET/SDH, Synchronous Ethernet (1G, 10G, and

100Mbps), wireless base stations, and CMTS

systems. PLL bandwidths from 18Hz to 400Hz are

supported, and a wide variety of PLL characteristics

and device features can be configured to meet the

needs of many different applications.

The DS3105 register set is backward compatible with

Semtech’s ACS8525 line card timing IC. The DS3105

pinout is similar but not identical to the ACS8525.

Applications

SONET/SDH, Synchronous Ethernet, PDH, and

Other Line Cards in WAN Equipment Including

MSPPs, Ethernet Switches, Routers, DSLAMs,

and Wireless Base Stations

Ordering Information

PART

TEMP RANGE

PIN-PACKAGE

DS3105LN

-40

C to +85C

64 LQFP

DS3105LN+

-40

C to +85C

64 LQFP

+Denotes a lead(Pb)-free/RoHS-compliant package.

Features

 Advanced DPLL Technology



Programmable PLL Bandwidth: 18Hz to 400Hz



Hitless Reference Switching, Automatic or Manual



Holdover on Loss of All Input References



Frequency Conversion Among SONET/SDH,

PDH, Ethernet, Wireless, and CMTS Rates

 Five Input Clocks



Two CMOS/TTL Inputs (≤ 125MHz)



Two LVDS/LVPECL/CMOS/TTL (≤ 156.25MHz)



Backup Input (CMOS/TLL) in Case of Complete

Loss of System Timing References



Three Optional Frame-Sync Inputs (CMOS/TTL)



Continuous Input Clock Quality Monitoring



Numerous Input Clock Frequencies Supported

Ethernet xMII: 2.5, 25, 125, 156.25MHz

SONET/SDH: 6.48, N x 19.44, N x 51.84MHz

PDH: N x DS1, N x E1, N x DS2, DS3, E3

Frame Sync: 2kHz, 4kHz, 8kHz

Custom Clock Rates: Any Multiple of 2kHz Up to

131.072MHz, Any Multiple of 8kHz Up to

155.52MHz

 Two Output Clocks



One CMOS/TTL Output (≤ 125MHz)



One LVDS/LVPECL Output (≤ 312.50MHz)



Two Optional Frame-Sync Outputs: 2kHz, 8kHz



Numerous Output Clock Frequencies Supported

Ethernet xMII: 2.5, 25, 125, 156.25, 312.5MHz

SONET/SDH: 6.48, N x 19.44, N x 51.84MHz

PDH: N x DS1, N x E1, N x DS2, DS3, E3

Other: 10, 10.24, 13, 30.72MHz

Frame Sync: 2kHz, 8kHz

Custom Clock Rates: Any Multiple of 2kHz Up to

77.76MHz, Any Multiple of 8kHz Up to

311.04MHz, Any Multiple of 10kHz Up to

388.79MHz

 General



Suitable Line Card IC for Stratum 3/3E/4, SMC,

SEC



Internal Compensation for Master Clock Oscillator



SPI™ Processor Interface



1.8V Operation with 3.3V I/O (5V Tolerant)



Industrial Operating Temperature Range

19-4628; Rev 3; 5/09

SPI is a trademark of Motorola, Inc.

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