DS3105 Datasheet, PDF (1/110 Pages) Maxim Integrated Products – Line Card Timing IC

Preliminary. Subject to Change Without Notice.
PRELIMINARY DATASHEET
DS3105
Line Card Timing IC
www.maxim-ic.com
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
100Mb/s), wireless basestations and CMTS systems.
PLL bandwidths from 18 Hz to 400 Hz 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.
FUNCTIONAL DIAGRAM
IC3
IC4
LVDS/LVPECL ^IC5
or CMOS/TTL IC6
IC9
SYNC1
SYNC2
SYNC3
local
oscillator
DS3105
control status
OC3
OC6 LVDS/LVPECL
FSYNC
MFSYNC
FEATURES
Advanced DPLL Technology
Programmable PLL bandwidth: 18 Hz to 400 Hz
Hitless Reference Switching, Automatic or Manual
Holdover on Loss of All Input References
Frequency Conversion Among SONET/SDH, PDH,
Ethernet, Wireless and CMTS Rates
5 Input Clocks
Two CMOS/TTL (≤125 MHz)
Two LVDS/LVPECL/CMOS/TTL (≤156.25 MHz)
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
- SONET/SDH: 6.48, N x 19.44, N x 51.84 MHz
- Ethernet xMII: 2.5, 25, 125, 156.25 MHz
- PDH: N x DS1, N x E1, N x DS2, DS3, E3
- Frame Sync: 2 kHz, 4 kHz, 8 kHz
- Custom: Any Multiple of 2 kHz up to 131.072 MHz,
Any Multiple of 8 kHz up to 155.52 MHz
2 Output Clocks
One CMOS/TTL Output (≤125 MHz)
One LVDS/LVPECL Output (≤312.50 MHz)
Two Optional Frame Sync Outputs: 2 kHz, 8 kHz
Numerous Output Clock Frequencies Supported
- SONET/SDH: 6.48, N x 19.44, N x 51.84 MHz
- Ethernet xMII: 2.5, 25, 125, 156.25, 312.5 MHz
- PDH: N x DS1, N x E1, N x DS2, DS3, E3
- Other: 10, 10.24, 13, 30.72 MHz, plus other
frequencies available upon request
- Frame Sync: 2 kHz, 8 kHz
- Custom Clock Rates: Any Multiple of 2 kHz up to
77.76 MHz, Any Multiple of 8 kHz up to 311.04 MHz
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
ORDERING INFORMATION
PART
DS3105LN
DS3105LN+
TEMP
RANGE
-40 to 85°C
-40 to 85°C
PACKAGE
LQFP64
LQFP64, RoHS compliant
Confidential. Document Issued Under Non-Disclosure Agreement. Confidential. Document Issued Under Non-Disclosure Agreement.
1 of 110
REV: 061507