622Mbps/1244Mbps Burst-Mode Clock Phase Aligner for GPON OLT Applications

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The MAX3634 burst-mode clock phase aligner (CPA) is designed specifically for 622Mbps or 1244Mbps GPON (ITU G.984) optical line terminal (OLT) receiver applications. The MAX3634 provides clock and clock-aligned resynchronized upstream data through differential LVPECL outputs. Using the OLT system clock as a reference, the MAX3634 aligns to the input data and acquires within the first 13 bits of the burst. The CPA operates with received data that is frequency locked to the OLT reference. The acquisition time, bit-error ratio, and jitter tolerance all support GPON PMD specifications. LVPECL high-speed clock and data outputs provide compatibility with FPGAs at 622Mbps and with the MAX3885 deserializer at 1244Mbps.

The MAX3634 is available in a low-profile, 7mm x 7mm, 48-lead TQFN package. The MAX3634 operates from a single +3.3V supply, over the -40°C to +85°C temperature range.

MAX3634: Typical Operating Circuit MAX3634: Typical Operating Circuit Enlarge+

Key Features

  • DC-Coupled Clock Phase Aligner for Burst-Mode GPON Applications
  • 13-Bit Burst Acquisition Time
  • 0.85UI High-Frequency Jitter Tolerance
  • Continuous Clock Output
  • Byte Rate (1/8th Data Rate) Reference Clock Input
  • Lock Detect Output
  • LVPECL Serial Data Input and Output
  • LVPECL Reset Input


  • 1244Mbps GPON OLT Receivers
  • 622Mbps GPON OLT Receivers

See parametric specs for Clock and Data Recovery (2)

Part NumberFunctionsData Rate
Data Rate
I/O TypePackage/PinsOper. Temp.
minmaxtypSee Notes
MAX3634 Clock-Phase Aligner6221244Yes3.3315LVPECL
-40 to +85$17.93 @1k

Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

MAX3634EVKIT: Evaluation Kit for the MAX3634
Product Reliability Reports: MAX3634.pdf 
Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C   Material Composition  

Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

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