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Analog Devices Inc./Maxim Integrated MAX3840ETJ+
- Part No.:
- MAX3840ETJ+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Specialized
- Package:
- 32-WFQFN Exposed Pad
- Datasheet:
-
MAX3840ETJ+.pdf
- Description:
- IC INTERFACE SPECIALIZED 32TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,346
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Product details
Overview
The MAX3840ETJ+ from Maxim Integrated is a dual 2×2 asynchronous CML crosspoint switch designed for OC-48 SDH/SONET and DWDM transport systems requiring serial data loop-through and protection channel switching. It supports 2.7Gbps data and 2.7GHz clock signals, delivers ≤2psRMS random jitter and ≤7psP-P deterministic jitter, and operates from a single +3.3V supply over –40°C to +85°C.
For engineers reviewing the MAX3840ETJ+ datasheet, MAX3840ETJ+ pinout, MAX3840ETJ+ application, or MAX3840ETJ+ equivalent, key selection criteria include CML I/O compatibility, channel-to-channel skew (≤6ps), power-down control per output, and 32-pin TQFN thermal performance in high-speed backplane and add-drop multiplexer designs.
Technical Context
The MAX3840ETJ+ implements two independent 2×2 crosspoint matrices with TTL-selectable routing via SELA0/SELA1 and SELB0/SELB1 inputs, enabling dynamic signal path reconfiguration without interrupting data flow. Each crosspoint drives fully differential CML outputs with on-chip 50Ω termination and supports AC-coupled LVPECL interfacing.
Output stages are individually enabled/disabled using ENA0/ENA1 and ENB0/ENB1 TTL controls, reducing power consumption to <460mW when all outputs are active. The SiGe bipolar process ensures stable jitter performance across temperature, with propagation delay tightly specified at 185ps and channel-to-channel skew limited to 6ps.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Data Rate | 2.7Gbps - supports OC-48/STM-16 line-rate data switching without retiming |
| Clock Rate | 2.7GHz - matches SONET/SDH reference clock frequencies for synchronous operation |
| Random Jitter | 2psRMS - preserves eye opening in 2.7Gbps PRBS23 streams under noisy supply conditions |
| Deterministic Jitter | 7psP-P - limits pattern-dependent timing distortion in burst-mode protection switching |
| Channel Skew | 6ps - enables simultaneous switching of dual data/clock pairs in add-drop multiplexers |
| Supply Voltage | +3.3V ±10% - compatible with standard telecom logic rails and eliminates need for LDO regulation |
| Power Consumption | 460mW (all outputs enabled) - allows thermal management in dense 5mm × 5mm QFN layouts |
Pinout & Package
The MAX3840ETJ+ is housed in a 32-pin exposed-pad thin QFN package (5mm × 5mm footprint, T3255-3 code) with GND-connected EP for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ENB1, ENB0, ENA0, ENA1 | TTL Output Enable Control | Active-low signals independently disable CML drivers to reduce static current per unused channel |
| SELA0, SELA1, SELB0, SELB1 | TTL Crosspoint Routing Select | Configure each 2×2 matrix to pass DIA0/DIB0 or DIA1/DIB1 to DOA0/DOB0 and DOA1/DOB1 outputs |
| DIA0±, DIA1±, DIB0±, DIB1± | CML Differential Inputs | 50Ω-terminated inputs accept 300–2000mVP-P swing; compatible with AC-coupled LVPECL |
| DOA0±, DOA1±, DOB0±, DOB1± | CML Differential Outputs | 800mVP-P typical swing into 50Ω, with common-mode voltage at VCC – 0.2V |
| VCC (Pins 10,13,16,17,20,23) | Positive Supply | Single +3.3V rail powers all analog and digital circuitry; six pins minimize IR drop |
| GND (Pins 9,24) | Supply Ground | Low-inductance return path; EP must be soldered to PCB ground plane for thermal dissipation |
Key Features
| Feature | Design Value |
|---|---|
| Asynchronous Crosspoint Switching | Enables hitless protection switching between primary and backup channels without clock domain synchronization |
| Per-Output Power-Down Control | Reduces total ICC by >50% when one or more outputs are deselected, critical for dynamic bandwidth allocation |
| On-Chip 50Ω Termination | Eliminates external resistors on all CML I/Os, simplifying layout and improving impedance matching at 2.7GHz |
| Low Channel-to-Channel Skew | 6ps max ensures matched delay between data and clock paths in dual-output configurations |
| SiGe Bipolar Process | Delivers stable jitter and gain characteristics across –40°C to +85°C, validated for telecom infrastructure use |
Applications
| OC-48 Add-Drop Multiplexer | SONET Line Card Protection Switching |
|---|---|
Use Scenario: Inserting/dropping tributary signals in metro DWDM nodes while maintaining line-rate continuity. IC Role / Device Role / Timing Role: Dual 2×2 crosspoint routes main and protection data/clock paths with sub-10ps skew. Use Value: Enables seamless 50ms switchover during fiber cut events without bit errors or frame loss. | Use Scenario: Providing redundant signal paths on SONET OC-48 line cards for carrier-grade reliability. IC Role / Device Role / Timing Role: Acts as a non-blocking switch between working and protect transceivers, controlled by APS protocol logic. Use Value: Maintains deterministic jitter accumulation below ITU-T G.823 limits across both active and standby paths. |
| High-Speed Backplane Interconnect | ATM Switch Fabric Interface |
Use Scenario: Interfacing multiple line-rate SERDES channels across a multi-slot chassis backplane. IC Role / Device Role / Timing Role: Fan-out/multiplex function bridges ASIC SERDES outputs to optical modules or midplane connectors. Use Value: Preserves 2.7Gbps eye margin through 15cm FR4 traces by minimizing crosstalk and skew. | Use Scenario: Aggregating cell-based traffic from multiple ingress ports onto shared egress links in core ATM switches. IC Role / Device Role / Timing Role: Crosspoint arbitrates time-division-multiplexed cell streams between port controllers and fabric interfaces. Use Value: Supports 2.7Gbps sustained throughput with <2ps RMS jitter to meet ATM layer 2 timing requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-speed CML crosspoint switching applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX3841ETJ+ | Same pinout and electrical specs; differs only in internal routing logic (non-inverting vs. inverting path mapping) | Requires minor firmware update to SELx control logic; identical thermal and jitter behavior | Select MAX3841ETJ+ only if legacy board design uses inverted routing table |
| LMH2190IRGZT | Single 2×2 CML switch (not dual); 3.125Gbps rated; no per-output enable; 24-pin WQFN | Lacks redundancy support; requires two devices for dual-path coverage; higher board area | Choose LMH2190IRGZT for cost-sensitive, single-path applications where space permits dual placement |
Compared with MAX3840ETJ+, MAX3841ETJ+ offers identical performance and drop-in mechanical compatibility but requires control logic adaptation, while LMH2190IRGZT trades integration density for higher data rate and simpler interface-neither is pin-compatible, but both serve overlapping telecom switching roles.
Availability
MAX3840ETJ+ is available at Aetrix Electronics and suitable for OC-48 transport systems, SONET line card protection switching, and high-speed backplane interconnects requiring stable component supply, long-lifecycle support, and guaranteed lead-free compliance.
Supply support for MAX3840ETJ+ 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 semiconductor company specializing in high-performance analog, mixed-signal, and RF solutions for communications, computing, and industrial markets.
The MAX3840ETJ+ belongs to Maxim's high-speed communication interface product line, engineered specifically for jitter-critical SDH/SONET and DWDM transport equipment where signal integrity and thermal reliability are non-negotiable.
FAQ
What is the maximum data rate supported by the MAX3840ETJ+?
The MAX3840ETJ+ supports a maximum data rate of 2.7Gbps for serial data signals and a clock rate of 2.7GHz. This specification is verified across the full operating temperature range (–40°C to +85°C) and aligns with OC-48/STM-16 line rates. The device maintains ≤2psRMS random jitter at this rate, making it suitable for forward error correction–enabled systems. The MAX3840ETJ+ does not support rates beyond 2.7Gbps, as confirmed by AC electrical characteristics tables and typical operating waveforms in the official datasheet.
Does the MAX3840ETJ+ require external termination resistors for CML I/O?
No, the MAX3840ETJ+ integrates 50Ω on-chip termination for all CML inputs and outputs, eliminating the need for external resistors. This is explicitly stated in the "CML Inputs and Outputs" section and confirmed by Figures 3 and 4 (input/output interface models) in the datasheet. The internal termination ensures optimal signal integrity at 2.7Gbps and simplifies PCB layout-only AC coupling capacitors are required for LVPECL interfacing. This feature applies directly to the MAX3840ETJ+ and is not shared with earlier MAX38xx variants lacking integrated termination.
How many independent crosspoint matrices does the MAX3840ETJ+ contain?
The MAX3840ETJ+ contains two independent 2×2 asynchronous crosspoint matrices-one for Channel A (DIA0/DIA1 → DOA0/DOA1) and one for Channel B (DIB0/DIB1 → DOB0/DOB1). Each matrix is controlled separately via dedicated TTL select pins (SELA0/SELA1 and SELB0/SELB1), enabling concurrent but non-interfering signal routing. This dual-matrix architecture is fundamental to the MAX3840ETJ+'s role in protection switching and is distinct from single-matrix alternatives like the MAX3841ETJ+.
What is the thermal management requirement for the MAX3840ETJ+?
The MAX3840ETJ+ requires soldering of its exposed pad (EP) to the PCB ground plane to ensure proper thermal dissipation and electrical stability. The datasheet mandates this connection in the Pin Description table and notes that failure to do so compromises both junction temperature control and signal integrity. With 460mW typical power dissipation, the 5mm × 5mm TQFN package relies on the EP for >70% of heat transfer. This requirement is specific to the MAX3840ETJ+ package variant (T3255-3) and differs from non-exposed-pad alternatives.
Can the MAX3840ETJ+ interface directly with LVPECL signals?
Yes, the MAX3840ETJ+ can interface directly with AC-coupled LVPECL signals due to its CML I/O compatibility and input voltage range (VCC – 0.8V to VCC + 0.5V). The datasheet confirms this in the General Description and Applications Information sections, referencing Maxim Application Note HFAN-01.0 for implementation guidance. No level-shifting ICs are needed-only series AC coupling capacitors and proper termination. This interoperability is a defined feature of the MAX3840ETJ+ and is validated across temperature and voltage corners.
MAX3840ETJ+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 32-WFQFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Applications:
- Data Transport
- Interface:
- -
- Voltage - Supply:
- 3V ~ 3.6V
- Supplier Device Package:
- 32-TQFN (5x5)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
MAX3840ETJ+ FAQ
1.How can I place an order for MAX3840ETJ+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX3840ETJ+ 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 MAX3840ETJ+ reliable?
The price and inventory of MAX3840ETJ+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX3840ETJ+ is usually 5 days.
3.What payment methods are accepted for MAX3840ETJ+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX3840ETJ+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX3840ETJ+?
MAX3840ETJ+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX3840ETJ+ 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 MAX3840ETJ+?
For technical support, including MAX3840ETJ+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX3840ETJ+ requirements.
6.How does Aetrix verify that MAX3840ETJ+ is sourced from the original manufacturer or authorized distributors?
All MAX3840ETJ+ 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 MAX3840ETJ+ meets industry standards.
7.What is the process for return or replacement of MAX3840ETJ+?
All MAX3840ETJ+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX3840ETJ+, 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 MAX3840ETJ+ part is unused and in its original packaging.
Return procedure for MAX3840ETJ+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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