ABRIDGED DATA SHEET
19-5659; Rev 4; 7/11
DS31408
8-Input, 14-Output, Dual DPLL Timing IC
with Sub-ps Output Jitter and 1588 Clock
General Description
Features
♦
♦
Eight Input Clocks
♦ Differential or CMOS/TTL Format
♦ Any Frequency from 2kHz to 750MHz
The DS31408 is a flexible, high-performance timing IC
for diverse frequency conversion and frequency
synthesis applications. On each of its eight input clocks
and fourteen output clocks, the device can accept or
generate nearly any frequency between 2kHz and
750MHz. The device offers two independent DPLLs to
serve two independent clock-generation paths. 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
each of the two flexible, high-performance digital PLLs.
Each DPLL lock to the selected reference and provides
programmable bandwidth, very high resolution holdover
capability, and truly hitless switching between input
clocks. The digital PLLs are followed by a clock
synthesis subsystem that 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 DS31408 has all
required features and functions to serve as a central
timing function or as a line card timing IC.
♦ 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
Two High-Performance DPLLs
♦ 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
Seven Digital Frequency Synthesizers
♦ Each Can Slave to Either DPLL
♦
♦
♦ Produce Any 2kHz Multiple Up to 77.76MHz
Three Output APLLs
♦ Output Frequencies to 750MHz
♦ High Resolution Fractional Scaling for FEC and
64B/66B (e.g., 255/237, 255/238, 66/64) or Any Other
Scaling Requirement
♦ Less than 1ps RMS Output Jitter
♦ Simultaneously Produce Three Low-Jitter Rates from
the Same Reference (e.g., 622.08MHz for SONET,
255/237*622.08MHz for OTU2, and 156.25MHz for
10GE)
In addition the DS31408 has an embedded IEEE 1588
clock that can be steered by system software to follow a
time master elsewhere in the system or elsewhere in
the network. This clock has all necessary features to be
the central time clock in a 1588 ordinary clock,
boundary clock or transparent clock.
♦
♦
14 Output Clocks in Seven Groups
♦ Nearly Any Frequency from < 1Hz to 750MHz
♦ Each Group Slaves to a DFS Clock, Any APLL Clock, or
Any Input Clock (Divided and Scaled)
♦ Each Has a Differential Output (3 CML, 4 LVDS/
LVPECL) and Separate CMOS/TTL Output
♦ 32-Bit Frequency Divider Per Output
Applications
Frequency Conversion and IEEE1588 Time/Frequency
Applications in a Wide Variety of Equipment Types
Telecom Line Cards or Timing Cards with Any Mix of
SONET/SDH, Synchronous Ethernet and/or OTN
Ports in WAN Equipment Including MSPPs, Ethernet
Switches, Routers, DSLAMs, and Base Stations
IEEE 1588 Clock Features
♦ Steerable by Software with 2-8ns Time Resolution and
2
-32ns Frequency Resolution
♦ 4ns Input Timestamp Accuracy and Output Edge
Placement Accuracy
♦ Programmable Clock and Time-Alignment I/O to
Synchronize All 1588 Devices in Large Systems
♦ Supports 1588 OC, BC, and TC Architectures
Ordering Information
♦
General Features
PART
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
256 CSBGA
256 CSBGA
♦ Suitable Line Card IC or Timing Card IC for Stratum
2/3E/3/4E/4, SMC, SEC/EEC, or SSU
♦ Accepts and Produces Nearly Any Frequency from 1Hz
Up to 750MHz
♦ Internal Compensation for Local Oscillator Frequency Error
♦ SPI™ Processor Interface
DS31408GN
DS31408GN+
+Denotes a lead(Pb)-free/RoHS-compliant package.
SPI is a trademark of Motorola, Inc.
♦ 1.8V Operation with 3.3V I/O (5V Tolerant)
Maxim Integrated Products
1
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.
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