The DS31406 is a flexible, high-performance timing IC
for
synthesis applications. On each of its two input clocks
and fourteen output clocks, the device can accept or
generate nearly any frequency between 2kHz and
750MHz.
The input clocks are divided down, fractionally scaled as
needed, and continuously monitored for activity and
frequency accuracy. The best input clock is selected,
manually or automatically, as the reference clock for the
rest of the device. A flexible, high-performance digital
PLL locks to the selected reference and provides
programmable bandwidth, very high resolution holdover
capability, and truly hitless switching between input
clocks. The digital PLL is followed by a clock synthesis
subsystem which has seven fully programmable digital
frequency synthesis blocks, three high-speed low-jitter
APLLs, and 14 output clocks, each with its own 32-bit
divider and phase adjustment. The APLLs provide
fractional scaling and output jitter less than 1ps RMS.
For telecom systems, the DS31406 has all required
features and functions to serve as a central timing
function or as a line card timing IC. With a suitable
oscillator the DS31406 meets the requirements of
Stratum 2, 3E, 3, 4E, and 4, G.812 Types I–IV, G.813,
and G.8262.
Frequency Conversion Applications in a Wide Variety of
Telecom Line Cards or Timing Cards with Any Mix of
+Denotes a lead(Pb)-free/RoHS-compliant package.
SPI is a trademark of Motorola, Inc.
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.
19-5711; Rev 0; 12/10
DS31406GN+
Equipment Types
SONET/SDH, Synchronous Ethernet and/or OTN
Ports in WAN Equipment Including MSPPs, Ethernet
Switches, Routers, DSLAMs, and Base Stations
diverse
PART
frequency
-40C to +85C
TEMP RANGE
2-Input, 14-Output, Single DPLL Timing IC
Ordering Information
General Description
conversion
ABRIDGED DATA SHEET
Applications
and
PIN-PACKAGE
256 CSBGA
frequency
with Sub-ps Output Jitter
Two Input Clocks
High-Performance DPLL
Seven Digital Frequency Synthesizers
Three Output APLLs
14 Output Clocks in Seven Groups
General Features
Produce Any 2kHz Multiple Up to 77.76MHz
Per-DFS Clock Phase Adjust
Output Frequencies to 750MHz
High Resolution Fractional Scaling for FEC and
Less than 1ps RMS Output Jitter
Simultaneously Produce Three Low-Jitter Rates from
Nearly Any Frequency from <1Hz to 750MHz
Each Group Slaves to a DFS Clock, Any APLL
Each Has a Differential Output (3 CML, 4 LVDS/
32-Bit Frequency Divider Per Output
Two Sync Pulse Outputs: 8kHz and 2kHz
Suitable Line Card IC or Timing Card IC for
Accepts and Produces Nearly Any Frequency Up
Internal Compensation for Local Oscillator
SPI™ Processor Interface
64B/66B (e.g., 255/237, 255/238, 66/64) or Any
Other Scaling Requirement
the Same Reference (e.g., 622.08MHz for SONET,
255/237*622.08MHz for OTU2, and 156.25MHz for
10GE)
Clock, or Any Input Clock (Divided and Scaled)
LVPECL
Stratum 2/3E/3/4E/4, SMC, SEC/EEC, or SSU
to 750MHz Including 1Hz, 2kHz, 8kHz, NxDS1,
NxE1, DS2/J2, DS3, E3, 2.5M, 25M, 125M,
156.25M, and Nx19.44M Up to 622.08M
Frequency Error
Differential or CMOS/TTL Format
Any Frequency from 2kHz to 750MHz
Fractional Scaling for 64B/66B and FEC Scaling
(e.g., 64/66, 237/255, 238/255) or Any Other
Downscaling Requirement
Continuous Input Clock Quality Monitoring
Automatic or Manual Clock Selection
Two 2/4/8kHz Frame Sync Inputs
Hitless Reference Switching on Loss of Input
Automatic or Manual Phase Build-Out
Holdover on Loss of All Inputs
Programmable Bandwidth, 0.5mHz to 400Hz
1.8V Operation with 3.3V I/O (5V Tolerant)
)
and Separate CMOS/TTL Output
Maxim Integrated Products 1
DS31406
Features