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Home > Products > Integrated Circuits (ICs) > Clock/Timing > Application Specific Clock/Timing

Analog Devices Inc./Maxim Integrated MAX3876EHJ

Name: MAX3876EHJ
Brand: Analog Devices Inc./Maxim Integrated
SKU: MAX3876EHJ
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MAX3876EHJ

Manufacturer:: Analog Devices Inc./Maxim Integrated

Category:: Application Specific Clock/Timing

Package:: 32-TQFP

Datasheet:: MAX3876EHJ.pdf

Description:: IC RECOV/RETIME 2.5GBPS 32-TQFP

Quantity:: RFQ Add To RFQ list

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Product details

Overview

MAX3876EHJ from Maxim Integrated is a 2.488Gbps clock recovery and data retiming IC for SDH/SONET OC-48/STM-16 systems, featuring fully integrated PLL architecture, differential CML clock/data outputs, 3.7mUI_RMS jitter generation, and TTL-compatible loss-of-lock (LOL) monitoring. It operates from a single +3.3V or +5.0V supply across –40°C to +85°C in a 32-pin TQFP package.

For engineers reviewing the MAX3876EHJ datasheet, MAX3876EHJ pinout, MAX3876EHJ application, or MAX3876EHJ equivalent, key selection criteria include jitter tolerance (≥0.41UI_p-p at 1MHz), input amplitude range (50–1000mV_p-p DC-coupled), consecutive identical digit tolerance (2500 bits), and system loopback diagnostic capability via SLBI± inputs.

Technical Context

The MAX3876EHJ implements a second-order PLL with an on-chip LC VCO operating at 2.488GHz, phase/frequency detector (PFD/FD) for rapid lock acquisition, and external loop filter (FIL+/FIL−) requiring a 1.0µF X7R capacitor. Its digital frequency detector eliminates false locking during startup by sampling I/Q VCO outputs on data edges.

Input amplifiers support both main data (SDI±) and system loopback (SLBI±) paths with 50Ω termination to VCC, while CML outputs (SDO±, SCLKO±) are internally terminated and deliver 580–1000mV_p-p swing with common-mode voltage of V_CC − 0.25V. The LOL output is TTL-compatible with internal 10kΩ pull-up and 800ns response time.

Key Specifications

Parameter	Value and Actual Design Meaning
Data Rate	2.488Gbps - matches OC-48/STM-16 line rate for direct integration into SDH/SONET regenerators and terminal receivers.
Jitter Generation	3.7mUI_RMS - measured over 12kHz–20MHz bandwidth; exceeds SONET/SDH regenerator specs (ITU-T G.823, Bellcore GR-1377).
Supply Voltage	+3.3V or +5.0V single supply - enables interoperability with legacy 5V and modern low-voltage 3.3V systems without level-shifting.
Input Sensitivity	50–1000mV_p-p (DC-coupled) - supports wide dynamic range from preamplified receiver front-ends to backplane interconnects.
Consecutive Identical Digits	2500 bits - ensures stable clock recovery under worst-case PRBS patterns without BER degradation (>1×10⁻¹⁰).
Operating Temperature	–40°C to +85°C - qualified for industrial and telecom equipment deployed in uncontrolled environments.
Power Dissipation	445mW typical at +3.3V - enables dense placement in multi-channel OC-48 line cards without excessive thermal management.

Pinout & Package

MAX3876EHJ is housed in a 32-pin Thin Quad Flat Package (TQFP) with exposed pad, optimized for high-frequency signal integrity and thermal dissipation in telecom line cards.

Pin/Terminal	Circuit Role	Design Meaning
4, 5	SDI+, SDI−	Differential 2.488Gbps data input path; accepts 50–1000mV_p-p DC-coupled NRZ signals with 50Ω termination to V_CC.
12, 13	SLBI+, SLBI−	Secondary differential input for system loopback diagnostics; selected via TTL SIS pin to validate transceiver integrity without external test gear.
19, 18, 23, 22	SCLKO+, SCLKO−, SDO+, SDO−	CML differential outputs - 2.488GHz clock and retimed data; internally terminated to 50Ω, require balanced 50Ω loads for optimal jitter performance.
7	SIS	TTL input selecting between SDI± (SIS = LOW) and SLBI± (SIS = HIGH); enables in-system functional testing without hardware reconfiguration.
25	LOL	TTL loss-of-lock indicator (active-low); asserts within 800ns of PLL unlock; includes internal 10kΩ pull-up for direct microcontroller monitoring.
30, 31	FIL+, FIL−	PLL loop filter interface; requires 1.0µF X7R capacitor between pins to set damping ratio and limit jitter peaking to <0.1dB.

Key Features

Feature	Design Value
Integrated PLL with LC VCO	On-die 2.488GHz VCO trimmed for frequency accuracy; eliminates external resonator and reduces board area vs discrete solutions.
Dual-input architecture (SDI±/SLBI±)	Enables real-time system loopback testing without interrupting live traffic-critical for add/drop multiplexer maintenance.
2500-bit CID tolerance	Maintains BER <1×10⁻¹⁰ under long zero/one runs, satisfying SONET section-regenerator requirements for transport-layer robustness.
Low-jitter CML outputs	580–1000mV_p-p swing with 3.7mUI_RMS generation ensures clean retimed clock/data for downstream 2.5G SERDES or FPGA interfaces.
Single-supply operation (+3.3V/+5.0V)	Eliminates need for dual-rail supplies in mixed-voltage telecom chassis, simplifying power delivery and reducing BOM count.

Applications

OC-48 Terminal Receiver	Add/Drop Multiplexer (ADM)
Use Scenario: Recovering clock and retiming data from incoming OC-48 optical line signals after PIN/TIA amplification. IC Role / Device Role / Timing Role: Clock recovery and data retiming IC performing phase alignment and jitter cleanup before FEC decoding. Use Value: 3.7mUI_RMS jitter generation and >0.41UI_p-p jitter tolerance ensure compliance with ITU-T G.823 regenerator limits under stressed link conditions.	Use Scenario: Enabling in-service loopback diagnostics on individual tributary ports without disrupting active traffic. IC Role / Device Role / Timing Role: Dual-input retiming IC supporting both live data (SDI±) and internal loopback (SLBI±) paths under TTL control. Use Value: SIS pin toggles between inputs in <1µs, allowing automated validation of serializer-deserializer chains during provisioning or fault isolation.
Digital Cross-Connect System (DCS)	SDH/SONET Test Equipment
Use Scenario: Retiming and distributing synchronized 2.488Gbps signals across multiple switching fabric lanes. IC Role / Device Role / Timing Role: Low-power clock recovery IC providing jitter-cleaned reference clocks and data streams to crosspoint switch controllers. Use Value: 445mW power consumption at +3.3V allows integration of 8+ channels per 1U card without exceeding thermal envelope.	Use Scenario: Generating precise, low-jitter reference waveforms for jitter tolerance and BER testing of other SONET components. IC Role / Device Role / Timing Role: Precision retiming IC serving as golden reference source with verified 2500-bit CID tolerance and sub-4mUI_RMS jitter. Use Value: Differential CML outputs directly drive test fixtures with minimal added jitter, eliminating need for external buffer stages in calibration setups.

OC-48 Terminal Receiver

Add/Drop Multiplexer (ADM)

Use Scenario: Recovering clock and retiming data from incoming OC-48 optical line signals after PIN/TIA amplification.

IC Role / Device Role / Timing Role: Clock recovery and data retiming IC performing phase alignment and jitter cleanup before FEC decoding.

Use Value: 3.7mUI_RMS jitter generation and >0.41UI_p-p jitter tolerance ensure compliance with ITU-T G.823 regenerator limits under stressed link conditions.

Use Scenario: Enabling in-service loopback diagnostics on individual tributary ports without disrupting active traffic.

IC Role / Device Role / Timing Role: Dual-input retiming IC supporting both live data (SDI±) and internal loopback (SLBI±) paths under TTL control.

Use Value: SIS pin toggles between inputs in <1µs, allowing automated validation of serializer-deserializer chains during provisioning or fault isolation.

Digital Cross-Connect System (DCS)

SDH/SONET Test Equipment

Use Scenario: Retiming and distributing synchronized 2.488Gbps signals across multiple switching fabric lanes.

IC Role / Device Role / Timing Role: Low-power clock recovery IC providing jitter-cleaned reference clocks and data streams to crosspoint switch controllers.

Use Value: 445mW power consumption at +3.3V allows integration of 8+ channels per 1U card without exceeding thermal envelope.

Use Scenario: Generating precise, low-jitter reference waveforms for jitter tolerance and BER testing of other SONET components.

IC Role / Device Role / Timing Role: Precision retiming IC serving as golden reference source with verified 2500-bit CID tolerance and sub-4mUI_RMS jitter.

Use Value: Differential CML outputs directly drive test fixtures with minimal added jitter, eliminating need for external buffer stages in calibration setups.

Equivalent & Alternatives

The following parts are listed as comparable options for similar clock recovery and data retiming applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
MAX3875EHJ	Same 32-pin TQFP package and pinout; differs only in jitter transfer bandwidth (JBW = 1.4MHz vs. 2.0MHz for MAX3876EHJ) and slightly higher jitter generation (6.2mUI_RMS vs. 3.7mUI_RMS).	Targeted at less stringent regenerator roles where tighter jitter filtering is not required; not recommended for terminal-receiver applications demanding lowest jitter.	Select MAX3875EHJ only when JBW <1.5MHz is acceptable and system-level jitter budget permits higher generation.
ICS873001AGLFT	2.5Gbps clock recovery IC in 32-pin QFN; lacks system loopback input (SLBI±) and TTL LOL output; uses LVPECL outputs instead of CML.	Designed for enterprise networking gear with LVPECL signaling; unsuitable for SONET test equipment requiring TTL monitoring or loopback diagnostics.	Choose ICS873001AGLFT only for cost-sensitive, non-telecom applications where CML compatibility and LOL monitoring are unnecessary.

Compared with MAX3875EHJ and ICS873001AGLFT, the MAX3876EHJ uniquely combines SONET-compliant jitter performance, dual-input diagnostic capability, and TTL monitoring in a single 32-pin TQFP-making it the only option qualified for OC-48 terminal-receiver and regenerator deployments requiring full standards compliance and in-system testability.

Availability

MAX3876EHJ is available at Aetrix Electronics and suitable for SDH/SONET receivers and regenerators, add/drop multiplexers, and digital cross-connect systems requiring stable component supply, long-term lifecycle assurance, and guaranteed traceable sourcing.

Supply support for MAX3876EHJ 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) is a U.S.-based semiconductor company specializing in high-performance analog, mixed-signal, and RF ICs for communications, computing, and industrial markets.

The MAX3876EHJ belongs to Maxim's high-speed timing and signal integrity product line, engineered specifically for SONET/SDH OC-48 infrastructure equipment where jitter performance, power efficiency, and diagnostic flexibility are critical design constraints.

FAQ

What is the primary function of the MAX3876EHJ in SDH/SONET systems?

The MAX3876EHJ serves as a fully integrated clock recovery and data retiming IC for 2.488Gbps OC-48/STM-16 applications. It extracts a synchronous clock from incoming NRZ data using an on-chip PLL, then retimes the data against that recovered clock. Its differential CML outputs deliver low-jitter clock and data signals compliant with SONET/SDH regenerator specifications, making the MAX3876EHJ essential in terminal receivers and section regenerators where jitter cleanup is mandatory.

Does the MAX3876EHJ support system-level loopback diagnostics, and how is it implemented?

Yes, the MAX3876EHJ supports system-level loopback diagnostics via dedicated SLBI+ and SLBI− inputs and the TTL-compatible SIS pin. When SIS is driven HIGH, the device switches from the primary SDI± data path to the SLBI± path, allowing a serializer output from the same system to be routed back for validation. This capability enables in-service testing without interrupting live traffic-critical for add/drop multiplexers and cross-connect systems-and is a distinguishing feature not found in most competing clock recovery ICs like the ICS873001AGLFT.

What are the absolute maximum supply voltage and operating temperature limits for the MAX3876EHJ?

The MAX3876EHJ has an absolute maximum supply voltage (V_CC) of –0.5V to +7.0V, though operational specification requires +3.0V to +5.5V. Its guaranteed operating temperature range is –40°C to +85°C, as explicitly designated by the "EHJ" suffix in the part number. This rating applies to the packaged device; die versions operate over –55°C to +150°C junction but are tested only at +25°C ambient. The MAX3876EHJ's thermal design supports continuous operation in telecom chassis without derating up to +85°C ambient.

How does the MAX3876EHJ achieve its low jitter generation of 3.7mUI_RMS?

The MAX3876EHJ achieves 3.7mUI_RMS jitter generation through a combination of on-die LC VCO trimming, fully differential signal architecture, low-noise design techniques, and precise loop filter control via external FIL+/FIL− pins. The VCO is factory-trimmed for frequency accuracy, minimizing inherent phase noise, while the second-order PLL's fixed 1.5MHz loop bandwidth and recommended 1.0µF loop capacitor suppress jitter peaking to <0.1dB. These design choices-validated across –40°C to +85°C-are why the MAX3876EHJ exceeds ANSI, ITU, and Bellcore SONET/SDH regenerator jitter specifications.

Can the MAX3876EHJ interface directly with PECL-level signals, and what is required?

The MAX3876EHJ accepts CML-level inputs (50–1000mV_p-p DC-coupled), so direct PECL interfacing requires attenuation and AC-coupling to maintain proper common-mode voltage. Maxim's datasheet Figure 7 shows a proven interface using 243Ω/226Ω resistor networks to attenuate PECL outputs while preserving 50Ω termination, plus 0.1µF AC-coupling capacitors. Attempting direct DC-coupled PECL connection risks violating the MAX3876EHJ's input voltage limits (V_CC – 0.5V to V_CC + 0.5V) and degrading jitter performance-so the external network is mandatory for reliable MAX3876EHJ operation with PECL sources.

MAX3876EHJ Specifications

Product attributes: Attribute value

Manufacturer:: Analog Devices Inc./Maxim Integrated

Series:: -

Package/Case:: 32-TQFP

Packaging:: Tray

Product Status:: Obsolete

Programmable:: Not Verified

PLL:: Yes

Main Purpose:: LCD Panels

Input:: CML

Output:: CML

Number of Circuits:: -

Ratio - Input:Output:: 1:1

Differential - Input:Output:: No/No

Frequency - Max:: 2.5GHz

Voltage - Supply:: 3V ~ 5.5V

Operating Temperature:: -40°C ~ 85°C

Mounting Type:: Surface Mount

Grade:: -

Qualification:: -

Supplier Device Package:: 32-TQFP (5x5)

MAX3876EHJ FAQ

1.How can I place an order for MAX3876EHJ through Aetrix?

Please submit a Request for Quotation (RFQ) for MAX3876EHJ 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 MAX3876EHJ reliable?

The price and inventory of MAX3876EHJ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX3876EHJ is usually 5 days.

3.What payment methods are accepted for MAX3876EHJ?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX3876EHJ transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MAX3876EHJ?

MAX3876EHJ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MAX3876EHJ 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 MAX3876EHJ?

For technical support, including MAX3876EHJ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX3876EHJ requirements.

6.How does Aetrix verify that MAX3876EHJ is sourced from the original manufacturer or authorized distributors?

All MAX3876EHJ 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 MAX3876EHJ meets industry standards.

7.What is the process for return or replacement of MAX3876EHJ?

All MAX3876EHJ units undergo pre-shipment inspection (PSI). If there is an issue with MAX3876EHJ, 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 MAX3876EHJ part is unused and in its original packaging.

Return procedure for MAX3876EHJ:

1.Submit a request within 90 days.

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

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