FEATURES
HIGHLIGHTS
• Features 15 mHz to 560 Hz bandwidth
• Provides node clock for ITU-T G.8261/G.8262 Synchronous Ethernet (SyncE)
• Supports GR-253-CORE (OC-192) and ITU-T G.813 (STM-64) jitter generation requirements
• Provides clocks for 1 Gigabit and 10 Gigabit Ethernet applications
MAIN FEATURES
• Provides an integrated single-chip solution for Synchronous Equipment Timing Source, including Stratum 3, 4E, 4, SMC, EEC-Option
1 and EEC-Option 2 Clocks
• Supports 1PPS input and output
• Employs PLL architecture to feature excellent jitter performance
and minimize the number of external components
• Supports programmable DPLL bandwidth (15 mHz to 560 Hz) and
damping factor (1.2 to 20 in 5 steps)
• Supports 1.1X10-5 ppm absolute holdover accuracy and 4.4X10-8
ppm instantaneous holdover accuracy
• Provides 2 differential output clocks whose frequencies cover from
1Hz (1PPS) to 644.53125 MHz
• Includes 25 MHz, 125 MHz and 156.25 MHz for CMOS outputs
• Includes 25.78125 MHz, 128.90625 MHz and 161.1328125 MHz
for CMOS outputs
• Includes 25 MHz, 125 MHz, 156.25 MHz, 312.5 MHz and 625
MHz for differential outputs
• Includes 25.78125 MHz, 128.90625 MHz, 161.1328125 MHz,
322.265625 MHz and 644.53125 MHz for differential output
• Provides 1 single ended output clock whose frequencies cover
from 1 Hz (1PPS) to 156.25 MHz
• Provides 2 differential input clocks whose frequency cover from 1
Hz (1PPS) to 625 MHz
• Includes 25 MHz, 125 MHz and 156.25 MHz for CMOS inputs
• Includes 25 MHz, 125 MHz, 156.25 MHz, 312.5 MHz and 625
MHz for differential inputs
• Provides 1 single ended input clock whose frequencies cover from
1 Hz (1PPS) to 156.25 MHz
• Supports Forced or Automatic operating mode switch controlled by
an internal state machine
• Automatic state machine supports Free- Run, Locked and Holdover
• Supports manual and automatic selected input clock switch
• Supports automatic hitless selected input clock switch on clock failure
• Supports Telcordia GR-1244-CORE, Telcordia GR-253-CORE,
ITU-T G.812, ITU-T G.8262, ITU-T G.813 and ITU-T G.783 recommendations
OTHER FEATURES
• Microprocessor interface modes: I2C and Serial
• IEEE 1149.1 JTAG Boundary Scan
• Single 3.3 V operation with 5 V tolerant CMOS I/Os
• 72-pin QFN package, green package options available

DESCRIPTION
The 8V89307 is an integrated solution for the Synchronous Equipment Timing Source supporting EEC-Option1, EEC-Option2 clocks in
Synchronous Ethernet equipment.
The device has a high quality DPLL to provide system clocks for
node timing synchronization within a Synchronous Ethernet network. It
also integrates an APLL for better jitter performance.
An input clock is automatically or manually selected. It supports three
primary operating modes: Free-Run, Locked and Holdover. In Free-Run
mode, the DPLL refers to the master clock. In Locked mode, the DPLL
locks to the selected input clock. In Holdover mode, the DPLL resorts to
the frequency data acquired in Locked mode. Whatever the operating
mode is, the DPLL gives a stable performance without being affected by
operating conditions or silicon process variations.
The device provides programmable DPLL bandwidths: 15 mHz to
560 Hz and damping factors: 1.2 to 20 in 5 steps. Different settings
cover all clock synchronization requirements.
A stable oscillator is required for the master clock in different applications. The master clock is used as a reference clock for all the internal
circuits in the device. It can be calibrated within ±741 ppm.
All the read/write registers are accessed through a microprocessor
interface. The device supports Serial and I2C interfaces.