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
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
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.
* 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.
Devices:
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DS3105
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Package:
TYPE PINS FOOTPRINT
DRAWING CODE/VAR *
Temp
RoHS/Lead-Free? Materials Analysis
DS3105LN+
LQFP;64 pin;149 mm²
Outline Drawing: 21-0083 (PDF)
Land Pattern: Not Available
Use pkgcode/variation: C64L+1*
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