Analog Devices Inc./Maxim Integrated MAX3264CUE+T

Overview

MAX3264CUE+T from Maxim Integrated is a 1.25Gbps current-mode logic (CML) limiting amplifier designed for Gigabit Ethernet and Fibre Channel optical receiver front-ends. It features programmable loss-of-signal (LOS) detection with RTH-based threshold setting, 14ps deterministic jitter, 300ps max edge speed, and operates from +3.0V to +5.5V supply. It interfaces directly with transimpedance amplifiers like MAX3266/MAX3267 in GBIC receivers.

For engineers reviewing the MAX3264CUE+T datasheet, MAX3264CUE+T pinout, MAX3264CUE+T application, or MAX3264CUE+T equivalent, this page delivers verified electrical specs, TSSOP-EP package details, CML output behavior under squelch, LOS hysteresis vs. temperature, and real-world design constraints including CAZ capacitor selection and input coupling requirements.

Technical Context

The MAX3264CUE+T implements a multistage limiting architecture with 55dB total gain and integrated RMS power detection. Its offset-correction loop-tuned via external CAZ1/CAZ2 capacitors-maintains input-referred offset below 100µV, enabling low deterministic jitter performance across 0°C to +70°C ambient operation.

It uses differential CML outputs with LEVEL-pin-selectable current (16mA open, 20mA grounded), supports AC- or DC-coupled termination per Figure 1, and provides dual LOS outputs (LOS and LOS) with internal 16kΩ pullups. The TH pin sets LOS assert/deassert thresholds via resistor values ranging from 2.5kΩ to 20kΩ, yielding programmable sensitivity from 2.2mV to 67mV.

Key Specifications

Pinout & Package

MAX3264CUE+T is housed in a 16-pin TSSOP-EP (exposed paddle) package, 4.4mm body width, RoHS-compliant and lead-free. The exposed paddle must be soldered to PCB ground for thermal and electrical integrity.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar limiting amplifier applications.

Compared with MAX3265CUE+T, the MAX3264CUE+T offers lower jitter sensitivity to input amplitude variation at 1.25Gbps but lacks 2.5Gbps capability; versus MAX3264CUE, it provides guaranteed tape-and-reel consistency for high-yield production runs without requalification.

Availability

MAX3264CUE+T is available at Aetrix Electronics and suitable for Gigabit Ethernet optical receivers, Fibre Channel interconnects, and telecom system backplanes requiring stable component supply, full traceability, and extended lifecycle support.

Supply support for MAX3264CUE+T includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Maxim Integrated (now part of Analog Devices) designs precision analog, mixed-signal, and high-speed ICs for communications, computing, and industrial systems.

The MAX3264 family targets optical receiver subsystems in pluggable modules, delivering jitter-controlled limiting amplification with programmable signal-detect functionality for standards-compliant GBIC and SFP implementations.

FAQ

What is the maximum allowable input voltage for MAX3264CUE+T?

The MAX3264CUE+T accepts a differential input voltage range of 10mV to 1200mV peak-to-peak. Absolute maximum rating is ±2.5V on IN+/IN− relative to VCC, but operation beyond 1200mV p-p risks saturation and increased deterministic jitter. For optimal performance, keep input within 100–800mV p-p per the Typical Operating Characteristics curves.

How does the LEVEL pin affect MAX3264CUE+T output drive strength?

The LEVEL pin on MAX3264CUE+T selects CML output current: open circuit yields ~16mA, while grounding it increases current to ~20mA. This adjustment compensates for trace loss and connector inductance-higher current improves signal integrity on longer or lossy PCB routes but increases power dissipation by ~12mW per output.

Can MAX3264CUE+T be used with PECL output interfaces?

No, MAX3264CUE+T provides CML outputs only. PECL outputs are exclusive to the MAX3268/MAX3269/MAX3768 family. Attempting to terminate MAX3264CUE+T outputs as PECL (e.g., to VCC − 2V) will cause incorrect biasing, excessive current draw, and potential damage. Use MAX3264CUE+T only with CML-terminated loads per Figure 1a/b.

What capacitor value should be used on CAZ1 and CAZ2 for Gigabit Ethernet applications?

For Gigabit Ethernet using 8B/10B encoding, leave CAZ1 and CAZ2 open (no external capacitor). This configures the offset-correction loop for f_OC = 2MHz, minimizing duty-cycle distortion and maintaining low deterministic jitter. Adding capacitance here degrades jitter performance and is unnecessary for 8B/10B data patterns.

Is MAX3264CUE+T pin-compatible with MAX3265CUE+T?

Yes, MAX3264CUE+T and MAX3265CUE+T share identical 16-pin TSSOP-EP footprints, pin assignments, and power sequencing requirements. However, their internal gain (55dB vs. 49dB), data rate (1.25Gbps vs. 2.5Gbps), and LOS threshold scaling differ-requiring verification of TH resistor value and system timing margins before substitution.