Product Preview
ZL30117/22
SONET/SDH LINE CARD SYNCHRONIZER
• Pin compatible and software compatible
single-chip devices integrate reference
switchingperformanceofaDPLLwithjitter
generationofanAPLL
-ZL30117meetsjitterrequirementsupto
OC-192/STM-64
-ZL30122meetsjitterrequirementsupto
OC-12/STM-16
• ConfigurableDPLL
- Provides all features for generating
SONET/SDHcompliantclocks
• PLL operates in free-run, normal and
holdover modes and provides automatic
hitlessreferenceswitching
• CMOS outputs for 19.44 MHz and 77.76
MHz clocks eliminate external dividers or
clockmultiplyingPLLs
• Programmable frame pulse formatter
replacesCPLDorFPGAgates
• Selectableoutputclocks(6.48MHz,19.44
MHz, 38.88 MHz, 51.84 MHz, 77.76
MHz, 155.52 MHz, 311.04 MHz, 622.08
MHz) eliminate external dividers & clock
multiplyingDPLLs
• Programmable output synthesizers
generate clock frequencies from any
multipleof 8 kHzup to 77.76MHzand 2
kHz
• Three reference inputs supporting clock
frequenciesinanymultipleof8kHzupto
77.76MHzand2kHz
• MeetsTelcordiaGR-253-COREandITU-T
G.813 jitter requirements upto OC-192/
STM-64
Microsemi
®
ZL30117 and ZL30122 chips are the industry’s smallest, lowest power
programmable analog/digital PLLs that solve the timing challenges posed by the
popular AdvancedTCA (telecommunications computing architecture), AMC (advanced
mezzanine card), and MicroTCA architectures.
Highly integrated devices, the ZL30117/22 PLLs combine the hitless reference switching
capabilities of a digital PLL with the jitter performance of an analog PLL. The ZL30117
and ZL30122 are pin compatible and software compatible devices differentiated by jitter
performance. With ultra-low jitter performance of less than 1ps, the ZL30117 can be
used in applications up to OC-192/STM-64. The ZL30122 limits jitter to less than 3ps
and can be used for applications up to OC-12/STM-16. The ZL30117/22 devices accept
three reference inputs, supporting clock frequencies in any multiple of 8 kHz up to 77.76
MHz, as well as supporting 2 kHz. The ZL30117/22 can directly lock to any of the three
standard clock inputs available to an AMC in an ATCA or MicroTCA application. The
holdover capability of the ZL30117/22 chips also enables them to ride out a complete
loss of an incoming reference, which can occur when switching from a failed clock unit
to a backup clock unit. The ZL30117/22 PLLs continue to operate in full compliance
with network requirements for several seconds after losing their reference, allowing time
for the system to switch to another reference source.
Simplifying design, the device synthesizes SONET/SDH interface clocks, tributary clock
families and SBI or Telecom busses without requiring significant board space or the use
of multiple PLLs.
• WANrouterlinecards
• DSLAMlinecards
• RNC/Mobileswitchingcenterlinecards
• NextgenerationSONET/SDHlinecards
• AdvancedTCA™boards
• AdvancedMezzanineCards
The ZL30117 and ZL30122 chips are
supported by evaluation boards, reference
designs, and the network of in-house
field application and design engineers of
Microsemi.
Integrated Timing Chips for SONET/
SDH Line Cards
Applications
Customer Support
ZL30117/22 Simplified Block Diagram
3
3
6
2
Clock and
Frame Pulse
Outputs
Clock and
Frame Pulse
Outputs
Frame Pulse
Inputs
Serial
Peripheral
Interface
20 MHz
Osc.
Clock Inputs
Reference
Clocks
2 kHz
N x 8 kHz
Line Card
Synchronizer
SONET/SDH
622.08 MHz
155.52 MHz
77.76 MHz
19.44 MHZ
etc...
Programmable
Synthesizer
2 kHz
N x 8 kHz
Master
Clock
Input
Monitors
Controller
and
State
Machine
Frame
Pulse
166.67 Hz
400 Hz
1 kHz
2 kHz
8 kHz
64 kHz
Digital
PLLs
Input
References
Output
Synthesizers
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Microsemi Corporation (NASDAQ: MSCC) offers a comprehensive portfolio of semiconductor
solutions for: aerospace, defense and security; enterprise and communications; and industrial
and alternative energy markets. Products include high-performance, high-reliability analog and
RF devices, mixed signal and RF integrated circuits, customizable SoCs, FPGAs, and complete
subsystems. Microsemi is headquartered in Aliso Viejo, Calif. Learn more at www.microsemi.com.
ZL30117/22
©2012MicrosemiCorporation.Allrightsreserved.MicrosemiandtheMicrosemilogoaretrademarksofMicrosemiCorporation.Allothertrademarksand
servicemarksarethepropertyoftheirrespectiveowners.
PublicationNumber:PP5929
MicrosemiZL30117 and ZL30122 are compact, highly integrated PLLs
thatsynthesizeSONET/SDHinterfaceclocks,tributaryclockfamiliesand
SBIorTelecombusclockslockedtobackplanereferences.Incorporating
digitalandanalogPLLs,thesesinglechipdevicesmanagetimingfornext-
generation SONET/SDH platforms operating at speeds up to OC-192/
STM-64. The ZL30117 and ZL30122 are pin compatible and software
compatibledevicesdifferentiatedbyjitterperformance.Withultra-lowjitter
performanceoflessthan1ps,theZL30117canbeusedinapplications
uptoOC-192/STM-64.TheZL30122limitsjittertolessthan3psandcan
be usedfor applications upto OC-12/STM-16. Competing two-chip or
moduleapproachesaremorethantwicethesizeoftheZL30117/22and
requireexternaldevicestomanagehigh-speednetworktiming.
AsillustratedbelowtheZL30117/22canlocktoanyoftheCLK1,CLK2,
orCLK3AMC(advancedmezzaninecard)clocksignals.WhentheACTA
carrier board switches its timing source between the redundant ATCA
backplaneclocks,theclockselectioncircuitryneedsonlytosquelch its
clockoutputstoforcetheZL30117/22intoholdoverandthenswitchover
tothenewclocksource.TheZL30117/22preventsbiterrorsduringthe
switch-overbycontinuingtogeneratestableclocks.
TheZL30117/22 canbeconfiguredto manuallyorautomatically switch
between valid input references upon reference failure. When using
automatic reference switching, reference selection criteria is based on
inputpriorityandanoptionalrevertivefeatureensuresthehighestpriority
validreferenceisalwaysselected.Whennovalidreferencesareavailable,
thedeviceautomaticallyentersholdovermodeandcontinuestogenerate
outputclocksbasedonhistoricalreferencefrequencydata.
The ZL30117/22 can simultaneously generate five output clocks from
two independent clock frequency families. Common SONET/SDH
clock frequencies, programmable n x 8 kHz clock frequencies and a
varietyofprogrammableframepulsescanbegeneratedsimultaneously.
Programmablephase delay adjustment and programmable frame pulse
formatting is also available and both CMOS and differential LVPECL
outputsareprovided.Thismeansvirtuallyanyrequiredfrequencycanbe
generated and adjusted as required, eliminating the need for additional
oscillators, external dividers, clock multiplying PLLs or level translation
devices.
Deliveringleadingintegration,flexibility,programmabilityandperformance,
theZL30117/22canbeimplementedasthesoletimingandsynchronization
sourceforvirtuallyanylinecarddeployedinmulti-serviceprovisioningand
multiserviceswitchingplatforms.
SONET/SDH Line Card Synchronizer
Advanced Mezzanine Card Synchronization
Input Reference Timing Distribution Bus via Backplane
ATCA Backplane Clocks
System
Clock
Timing
Cards
CLK3 CLK3
CLK1
CLK2
CLK3
CLK1
CLK1
CLK2
CLK2
CLK3
Advanced
Mezzanine
Card
ATCA Carrier Board
ZL30121
20 MHz
OCXO/
TCXO
Clock
Selection
Circuitry
ZL30117
OC-48/STM-16
Framer/Mapper/
SERDES
ZL30122
20 MHz
XTAL/XO
20 MHz
XTAL/XO
Advanced
Mezzanine
Card
OC-12/STM-4
Framer/Mapper/
SERDES
20 MHz
XTAL/XO