+3.0V to +5.5V, 1.25Gbps/2.5Gbps Limiting Amplifiers

Limiting Amplifier with Squelch Function Generates Low Deterministic Jitter

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The 1.25Gbps MAX3264/MAX3268/MAX3768 and the 2.5Gbps MAX3265/MAX3269/MAX3765 limiting amplifiers are designed for Gigabit Ethernet and Fibre Channel optical receiver systems. The amplifiers accept a wide range of input voltages and provide constant-level output voltages with controlled edge speeds. Additional features include RMS power detectors with programmable loss-of-signal (LOS) indication, an optional squelch function that mutes the data output signal when the input voltage falls below a programmable threshold, and excellent jitter performance.

The MAX3264/MAX3265/MAX3765 feature current-mode logic (CML) data outputs that are tolerant of inductive connectors and a 16-pin TSSOP package, making these circuits ideal for GBIC receivers. The MAX3268/ MAX3269/MAX3768 feature standards-compliant positive-referenced emitter-coupled logic (PECL) data outputs and are available in a tiny 10-pin µMAX® package that is ideal for small-form-factor (SFF) receivers.
MAX3264, MAX3265, MAX3268, MAX3269, MAX3765, MAX3768: Typical Operating Circuit MAX3264, MAX3265, MAX3268, MAX3269, MAX3765, MAX3768: Typical Operating Circuit Enlarge+

Key Features

  • +3.0V to +5.5V Supply Voltage
  • Low Deterministic Jitter
    • 14ps (MAX3264)
    • 11ps (MAX3265/MAX3765)
      • 150ps (max) Edge Speed (MAX3265/MAX3765)
      • 300ps (max) Edge Speed (MAX3264)
      • Programmable Signal-Detect Function
      • Choice of CML or PECL Output Interface
      • 10-Pin µMAX or 16-Pin TSSOP Package


  • ATM Optical Receivers
  • Fibre Channel Optical Receivers
  • Gigabit Ethernet Optical Receivers
  • System Interconnect

See parametric specs for Limiting Amplifiers (10)

Part NumberTarget Oper. Range
Data Rate
Data Rate
I/O TypeInput Sens.
LOS Sens.
Edge Speed
minmaxtypminmaxSee Notes
MAX3268 1 to 4.510621250
$4.66 @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.

Technical Documents

App Note 468 MAX3265: Using MAX3265 LOS in GBICs
Product Reliability Reports: MAX3269.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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