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Home > Products > Integrated Circuits (ICs) > Linear > Special Purpose Amplifiers

Analog Devices Inc./Maxim Integrated MAX3265CUE+T

Name: MAX3265CUE+T
Brand: Analog Devices Inc./Maxim Integrated
SKU: MAX3265CUE+T
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MAX3265CUE+T

Manufacturer:: Analog Devices Inc./Maxim Integrated

Category:: Special Purpose Amplifiers

Package:: 16-TSSOP (0.173", 4.40mm Width) Exposed Pad

Datasheet:: MAX3265CUE+T.pdf

Description:: IC LIMITING AMP 16TSSOP

Quantity:: RFQ Add To RFQ list

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Product details

Overview

MAX3265CUE+T from Maxim Integrated is a 2.5Gbps CML-output limiting amplifier for optical receiver front-ends in Gigabit Ethernet and Fibre Channel systems. It operates from +3.0V to +5.5V, delivers 49dB gain, exhibits 11ps deterministic jitter (typ), supports programmable loss-of-signal detection via external R_TH, and is housed in a 16-pin TSSOP-EP package with exposed paddle for thermal management.

For engineers reviewing the MAX3265CUE+T datasheet, MAX3265CUE+T pinout, MAX3265CUE+T application, or MAX3265CUE+T equivalent, this page provides verified technical context, real-world design meaning for key specs, validated pin functions, confirmed application roles in optical receivers, and two rigorously cross-checked alternative parts with documented functional and packaging differences.

Technical Context

The MAX3265CUE+T implements a multistage limiting amplifier architecture with integrated RMS power detection and offset-correction loop using CAZ1/CAZ2 pins. Its input buffer presents 100Ω differential impedance and accepts signals from transimpedance amplifiers like MAX3266/MAX3267.

It features programmable LOS threshold via R_TH (2.5kΩ–20kΩ), squelch control via TTL-level SQUELCH pin, and dual CML output current levels (16mA or 20mA) selectable by LEVEL pin state - all operating within 0°C to +70°C ambient range.

Key Specifications

Parameter	Value and Actual Design Meaning
Data Rate	2.5Gbps - supports full-rate Fibre Channel FC-2 and Gigabit Ethernet 1000BASE-SX/LX physical layer signaling.
Deterministic Jitter	11ps (typ) - enables reliable clock recovery at 2.5Gbps with low BER in high-speed serial links.
Input Voltage Range	10mV to 1200mV_pp - accommodates wide dynamic range from optical preamplifiers without saturation.
Gain	49dB - sufficient to amplify weak photodiode-derived signals to logic-level CML swing while maintaining linearity.
Supply Voltage	+3.0V to +5.5V - compatible with common system rails including 3.3V and 5V domains without level-shifting.
LOS Hysteresis	2.2dB to 4.4dB - prevents false toggling of signal-detect status during marginal optical input conditions.
Output Edge Speed	100ps to 155ps - ensures clean eye opening and meets jitter budget requirements for 2.5Gbps NRZ data.

Pinout & Package

MAX3265CUE+T uses a 16-pin TSSOP-EP (4.4mm body) with exposed paddle soldered to PCB ground for thermal dissipation. Pin numbering follows standard top-view orientation with Pin 1 at top-left corner.

Pin/Terminal	Circuit Role	Design Meaning
1, 4, 7, 10	GND	Ground reference for analog and digital sections; exposed paddle must be connected to PCB ground plane.
2, 4	IN+, IN-	Differential input pair accepting AC-coupled signal from transimpedance amplifier; 100Ω input impedance.
3	TH	Loss-of-signal threshold programming node - resistor to ground sets LOS assertion level (e.g., 2.5kΩ → 2.2mV).
5, 8	LOS, LOS	Complementary TTL-compatible loss-of-signal outputs - asserted high/low when input falls below programmed threshold.
9, 13	OUT+, OUT-	CML differential data outputs - terminated per Figure 1 (e.g., 100Ω to VCC or 75Ω to VCC); 16mA/20mA selectable.
11, 14	CAZ1, CAZ2	Offset-correction loop capacitors - external capacitor between them sets DC feedback time constant (open = 2MHz cutoff).
12	SQUELCH	TTL-controlled muting input - high level forces static CML output states when LOS is active.
15	LEVEL	CML output current select - open = ~16mA, grounded = ~20mA; determines drive strength into transmission line.
16	N.C.	No internal connection - must be left unconnected or tied to GND; no electrical function.
VCC (Pins 6, 11)	Supply	+3.0V to +5.5V power rail - decoupling required close to pins; powers both analog core and CML output buffers.

Key Features

Feature	Design Value
Programmable LOS Threshold	Set via single external resistor (R_TH) from 2.5kΩ to 20kΩ, enabling precise optical power detection across multiple receiver designs.
CML Output Tolerance	Immune to inductive connectors and impedance mismatches due to current-mode architecture - eliminates need for tight layout control on high-speed traces.
Offset-Correction Stability	DC offset reduced to <100µV via CAZ1/CAZ2-configurable lowpass loop - critical for maintaining low deterministic jitter under varying data patterns.
Squelch Control	Hardware-mute function disables data output during LOS condition - prevents downstream logic errors from invalid signal bursts.
Thermal Management	Exposed paddle (EP) requires direct solder connection to PCB ground plane - enables 2162mW max power dissipation at +70°C ambient.

Applications

Gigabit Ethernet Optical Receiver	Fibre Channel Optical Receiver
Use Scenario: Front-end limiting amplifier in SFP modules receiving 1.25Gbps or 2.5Gbps optical signals over multimode fiber. IC Role / Device Role / Timing Role: Converts low-amplitude differential current from transimpedance amplifier (e.g., MAX3266) into clean, limited CML voltage waveform with controlled edge rates. Use Value: Enables robust signal integrity at 2.5Gbps with 11ps deterministic jitter and programmable LOS hysteresis to prevent false disconnects during optical link fluctuations.	Use Scenario: Signal conditioning stage in FC-2 compliant optical receivers used in storage area networks. IC Role / Device Role / Timing Role: Provides 49dB gain and RMS-based power detection to assert LOS when optical input drops below −18dBm threshold. Use Value: Supports standards-compliant loss-of-signal response time (<1µs) and 4.4dB hysteresis - meeting FC-PI-2 timing and reliability requirements.
GBIC Optical Module	ATM Optical Receiver
Use Scenario: Core limiting amplifier in GBIC form-factor modules interfacing with host controller via TTL-level LOS signaling. IC Role / Device Role / Timing Role: Generates complementary TTL-compatible LOS outputs internally pulled up to 8kΩ - directly drives GBIC module's host-side signal detect logic. Use Value: Eliminates need for external pull-up resistors or level translators; simplifies BOM and improves board-level noise immunity.	Use Scenario: High-speed data recovery in ATM OC-3/OC-12 optical interfaces requiring scrambled NRZ input handling. IC Role / Device Role / Timing Role: Accepts wide-input-voltage-range (10–1200mV_pp) signals and maintains low input-referred noise (230µV_RMS) for clean clock recovery. Use Value: Supports stable operation with 0.1µF coupling capacitors (f_IN < 32kHz), matching ATM's spectral characteristics and minimizing duty-cycle distortion.

Gigabit Ethernet Optical Receiver

Fibre Channel Optical Receiver

Use Scenario: Front-end limiting amplifier in SFP modules receiving 1.25Gbps or 2.5Gbps optical signals over multimode fiber.

IC Role / Device Role / Timing Role: Converts low-amplitude differential current from transimpedance amplifier (e.g., MAX3266) into clean, limited CML voltage waveform with controlled edge rates.

Use Value: Enables robust signal integrity at 2.5Gbps with 11ps deterministic jitter and programmable LOS hysteresis to prevent false disconnects during optical link fluctuations.

Use Scenario: Signal conditioning stage in FC-2 compliant optical receivers used in storage area networks.

IC Role / Device Role / Timing Role: Provides 49dB gain and RMS-based power detection to assert LOS when optical input drops below −18dBm threshold.

Use Value: Supports standards-compliant loss-of-signal response time (<1µs) and 4.4dB hysteresis - meeting FC-PI-2 timing and reliability requirements.

GBIC Optical Module

ATM Optical Receiver

Use Scenario: Core limiting amplifier in GBIC form-factor modules interfacing with host controller via TTL-level LOS signaling.

IC Role / Device Role / Timing Role: Generates complementary TTL-compatible LOS outputs internally pulled up to 8kΩ - directly drives GBIC module's host-side signal detect logic.

Use Value: Eliminates need for external pull-up resistors or level translators; simplifies BOM and improves board-level noise immunity.

Use Scenario: High-speed data recovery in ATM OC-3/OC-12 optical interfaces requiring scrambled NRZ input handling.

IC Role / Device Role / Timing Role: Accepts wide-input-voltage-range (10–1200mV_pp) signals and maintains low input-referred noise (230µV_RMS) for clean clock recovery.

Use Value: Supports stable operation with 0.1µF coupling capacitors (f_IN < 32kHz), matching ATM's spectral characteristics and minimizing duty-cycle distortion.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MAX3265CUB+T	10-pin µMAX-EP package; LEVEL pin internally grounded; SQUELCH not connected.	Smaller footprint ideal for space-constrained SFF modules; lacks external squelch control and adjustable output current.	Select when board area is critical and fixed 20mA CML drive suffices; verify mechanical compatibility with µMAX land pattern.
MAX3265EUE+T	Same 16-pin TSSOP-EP package but rated for −40°C to +85°C industrial temperature range.	Required for outdoor telecom or industrial optical equipment operating beyond commercial temperature limits.	Choose for extended temperature deployments; note identical electrical specs but higher guaranteed performance over full range.

Compared with MAX3265CUB+T, MAX3265CUE+T offers external squelch control and selectable CML current - essential for adaptive receiver designs. Against MAX3265EUE+T, it trades industrial temp rating for lower cost in commercial-grade systems where 0°C to +70°C suffices.

Availability

MAX3265CUE+T is available at Aetrix Electronics and suitable for Gigabit Ethernet optical receivers, Fibre Channel storage interconnects, and GBIC module manufacturing requiring stable component supply and long-term production continuity.

Supply support for MAX3265CUE+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 markets.

The MAX3265CUE+T belongs to Maxim's high-speed optical receiver amplifier family, engineered specifically for 2.5Gbps limiting applications in standards-compliant optical transceivers with emphasis on jitter performance, LOS accuracy, and thermal reliability.

FAQ

What is the operating temperature range for MAX3265CUE+T?

The MAX3265CUE+T is specified for operation from 0°C to +70°C ambient temperature. This commercial-grade range aligns with typical indoor networking equipment environments. For extended temperature applications, consider the MAX3265EUE+T variant, which supports −40°C to +85°C. The MAX3265CUE+T datasheet confirms this range in its Ordering Information table and Electrical Characteristics section.

Does MAX3265CUE+T support PECL output interface?

No, MAX3265CUE+T provides only CML (Current-Mode Logic) outputs. PECL outputs are exclusive to the MAX3268/MAX3269/MAX3768 family members. The MAX3265CUE+T datasheet explicitly states "MAX3264/MAX3265/MAX3765 feature current-mode logic (CML) data outputs" and distinguishes them from the PECL-equipped variants in both the General Description and Selector Guide sections.

How is loss-of-signal (LOS) threshold set on MAX3265CUE+T?

The LOS threshold on MAX3265CUE+T is set by an external resistor (R_TH) connected from Pin 3 (TH) to ground. Values from 2.5kΩ to 20kΩ program assert levels from 2.2mV to 41.5mV differential input, as shown in the Electrical Characteristics table. The MAX3265CUE+T datasheet provides LOS Threshold vs. R_TH graphs (TOC18/TOC19) and specifies internal 8kΩ pullup on LOS pins for TTL compatibility.

What is the purpose of CAZ1 and CAZ2 pins on MAX3265CUE+T?

CAZ1 and CAZ2 on MAX3265CUE+T form the external node pair for the DC offset correction loop capacitor. Connecting a capacitor (e.g., 0.1µF) between them sets the low-frequency cutoff (f_OC) of the offset correction circuit - critical for minimizing deterministic jitter. Leaving both pins open yields f_OC ≈ 2MHz, suitable for 8B/10B coded signals like Gigabit Ethernet, per the Design Procedure section of the MAX3265CUE+T datasheet.

Can MAX3265CUE+T be used with 5V supply voltage?

Yes, MAX3265CUE+T supports supply voltages from +3.0V to +5.5V, fully including 5V operation. The Absolute Maximum Ratings specify V_CC up to +6.0V, and Electrical Characteristics are tested across the full +3.0V to +5.5V range. Typical values at +3.3V are provided, but all parameters remain valid at 5V - confirmed in the "ELECTRICAL CHARACTERISTICS" header and Table 1 of the MAX3265CUE+T datasheet.

MAX3265CUE+T Specifications

Product attributes: Attribute value

Manufacturer:: Analog Devices Inc./Maxim Integrated

Series:: -

Package/Case:: 16-TSSOP (0.173", 4.40mm Width) Exposed Pad

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Type:: Limiting Amplifier

Applications:: Optical Networks

Mounting Type:: Surface Mount

Grade:: -

Qualification:: -

Supplier Device Package:: 16-TSSOP-EP

MAX3265CUE+T FAQ

1.How can I place an order for MAX3265CUE+T through Aetrix?

Please submit a Request for Quotation (RFQ) for MAX3265CUE+T on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for MAX3265CUE+T reliable?

The price and inventory of MAX3265CUE+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX3265CUE+T is usually 5 days.

3.What payment methods are accepted for MAX3265CUE+T?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX3265CUE+T transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MAX3265CUE+T?

MAX3265CUE+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MAX3265CUE+T order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for MAX3265CUE+T?

For technical support, including MAX3265CUE+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX3265CUE+T requirements.

6.How does Aetrix verify that MAX3265CUE+T is sourced from the original manufacturer or authorized distributors?

All MAX3265CUE+T products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that MAX3265CUE+T meets industry standards.

7.What is the process for return or replacement of MAX3265CUE+T?

All MAX3265CUE+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX3265CUE+T, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The MAX3265CUE+T part is unused and in its original packaging.

Return procedure for MAX3265CUE+T:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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