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Description

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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.

Key Features

Applications/Uses

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

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

Number of Independent DPLLs

Number of Input Clocks

Number of Differential Input Clocks

Number of Output Clocks

Number of Differential Output Clocks

Input Clock Frequencies

Output Clock Frequencies

Number of DS1/E1/J1 Receivers

Number of DS1/E1/J1 Transmitters

Minimum DPLL Bandwidth (Hz)

Maximum DPLL Bandwidth (Hz)

Smallest Available Package (max w/pins) (mm²)

Price^**

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
E3
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

149

$30.40 @ 1k

See All Timing Card and Line Card ICs (6)

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.