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DS3105

Line Card Timing IC

Low-Cost Line Card Timing IC with Synchronous Ethernet Support

Overview

Technical Documents

Ordering Info

Status

Active: In Production.

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.

Data Sheet

Download	Rev 4	(PDF, 636kB)
E-Mail

Errata DS3105 3105A2.pdf

An evaluation kit is available: DS3105DK

Key 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 (≤ 125MHz)
- Two LVDS/LVPECL/CMOS/TTL (≤ 156.25MHz)
- Backup Input (CMOS/TTL) 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: 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
  - Frame Sync: 2kHz, 8kHz
  - Other: 10, 10.24, 13, 30.72MHz
  - 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 3E/3/4, 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

Applications/Uses

SONET/SDH, Synchronous Ethernet, PDH, and Other Line Cards in WAN Equipment Including MSPPs, Ethernet Switches, Routers, DSLAMs, and Wireless Base Stations

Key Specifications:

Timing Card and Line Card ICs

Part Number

Indep. DPLLs

Input Clocks

Diff. Input Clocks

Output Clocks

Diff. Output Clocks

f_CLKIN

f_CLKOUT

DPLL BW
(Hz)

Smallest Available Pckg.
(mm²)

Budgetary Price

min

max

max w/pins

See Notes

DS3105

2kHz and 4kHz

25.00MHz

125.00MHz

156.25MHz

312.5MHz

N x 19.44MHz

N x 2kHz up to 131.072MHz

N x 8kHz up to 155.52MHz

N x DS1

N x E1

2kHz

6.48MHz

8kHz

25.00MHz

51.84MHz

62.5MHz

125.00MHz

155.52MHz

156.25MHz

311.04MHz

312.5MHz

DS3

N x 10kHz up to 388.79MHz

N x 19.44MHz

N x 2kHz up to 77.76MHz

N x 8kHz up to 311.04MHz

N x DS1

N x DS2

N x E1

400

148.8

$30.40 @1k

See All Timing Card and Line Card ICs (12)

Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

Diagram

Typical Application Example

Application Notes

Application Note 4391

Implement Master-Slave Timing-Card Redundancy Using Maxim Timing ICs

Product Guides

Communications (PDF)

Reliability Reports

Reliability Report:

DS3105.pdf

Software/Models

DS3105 BSDL Model

DS3105 IBIS Model

DS3105 Rev A2 Initialization Script

Ordering Information

Filters:

Part Number:

Package:

Temperature:

Tape and Reel

Sample

Part Number	Free Sample	Buy	Status	Package: TYPE PINS FOOTPRINT DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
DS3105LN			Active	TQFP;64 pin;148.8 mm² Outline Drawing:21-0083 (PDF) Land Pattern: 90-0141 (PDF) Use pkgcode/variation: C64-1*	-40°C to +85°C	See data sheet
DS3105LN+			Active	TQFP;64 pin;148.8 mm² Outline Drawing:21-0083 (PDF) Land Pattern: 90-0141 (PDF) Use pkgcode/variation: C64+1*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis

Notes:

Other options and links for purchasing parts are listed at: http://www.maxim-ic.com/sales.
Didn't Find What You Need? Ask our applications engineers. Expert assistance in finding parts, usually within one business day.
Part number suffixes: T or T&R = tape and reel; + = RoHS/lead-free; # = RoHS/lead-exempt; -D = drypack; -U/+U on DS parts = cut tape. More: See Full Data Sheet or Maxim Product Naming Conventions.
* Some packages have variations, listed on the drawing. "PkgCode/Variation" tells which variation the product uses. Note that "+", "#", "-" in the part number suffix describes RoHS status. Package drawings may show a different suffix character.

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Evaluation Kits

DS3105DK

Demo Kit for DS3105

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