ZL30402
SONET/SDH Network Element PLL
Data Sheet
Features
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Meets requirements of GR-253 for SONET
stratum 3 and SONET Minimum Clocks (SMC)
Meets requirements of GR-1244 for stratum 3
Meets requirements of G.813 Option 1 and 2 for
SDH Equipment Clocks (SEC)
Generates clocks for ST-BUS, DS1, DS2, DS3,
OC-3, E1, E2, E3, STM-1 and 19.44 MHz
Holdover accuracy to 1x10
meets GR-1244
Stratum 3E and ITU-T G.812 requirements
Continuously monitors Primary and Secondary
reference clocks
Provides “hit-less” reference switching
Compensates for Master Clock Oscillator
accuracy
Detects frequency of both reference clocks and
synchronizes to any combination of 8 kHz,
1.544 MHz, 2.048 MHz and 19.44 MHz reference
frequencies.
Allows Hardware or Microprocessor control
Pin compatible with MT90401 device.
-12
May 2006
Ordering Information
ZL30402/QCC
ZL30402QCG1
80 Pin LQFP Trays
80 Pin LQFP* Trays, Bake & Drypack
*Pb Free Matte Tin
-40°C to +85°C
Description
The ZL30402 is a Network Element Phase-Locked
Loop designed to synchronize SDH and SONET
systems. In addition, it generates multiple clocks for
legacy PDH equipment and provides timing for ST-BUS
and GCI backplanes.
The ZL30402 operates in NORMAL (LOCKED),
HOLDOVER and FREE-RUN modes to ensure that in
the presence of jitter, wander and interruptions to the
reference signals, the generated clocks meet
international standards. The filtering characteristics of
the PLL are hardware or software selectable and they
do not require any external adjustable components.
The ZL30402 uses an external 20 MHz Master Clock
Oscillator to provide a stable timing source for the
HOLDOVER operation.
The ZL30402 operates from a single 3.3 V power
supply and offers a 5 V tolerant microprocessor
interface.
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Applications
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Synchronization for SDH and SONET Network
Elements
Clock generation for ST-BUS and GCI
backplanes
VDD GND
C20i
FCS
PRI
Primary
Acquisition
PLL
Master Clock
Frequency
Calibration
APLL
MUX
SEC
Core PLL
Clock
Synthesizer
Secondary
Acquisition
PLL
C155P/N
C34/C44
C19o
C16o
C8o
C6o
C4o
C2o
C1.5o
F16o
F8o
F0o
E3DS3/OC3
E3/DS3
RefSel
HW
RESET
CS DS R/W A0-A6 D0-D7
Microport
Control State Machine
JTAG
IEEE
1149.1a
Tclk
Tdi
Tdo
Tms
Trst
MS1 MS2
RefAlign LOCK HOLDOVER
Figure 1 - Functional Block Diagram
1
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Copyright 2003-2006, Zarlink Semiconductor Inc. All Rights Reserved.
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