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Analog Devices Inc./Maxim Integrated MAX3890ECB
- Part No.:
- MAX3890ECB
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Serializers, Deserializers
- Package:
- 64-TQFP Exposed Pad
- Datasheet:
-
MAX3890ECB.pdf
- Description:
- SERIALIZER WITH CLOCK SYNTHESIS
- Quantity:
- Payment:
- Shipping:
Inventory:799
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Product details
Overview
The MAX3890ECB from Maxim Integrated is a +3.3V, 2.5Gbps SDH/SONET 16:1 serializer with integrated PLL clock synthesis, converting 16-bit-wide 155.52MHz parallel data to 2.488Gbps serial output. It features LVDS parallel inputs, PECL serial outputs, and supports four reference clock frequencies (38.88/51.84/77.76/155.52MHz). Designed for telecom transmission systems, it operates across -40°C to +85°C in a 64-pin TQFP-EP package.
For engineers reviewing the MAX3890ECB datasheet, MAX3890ECB pinout, MAX3890ECB application, or MAX3890ECB equivalent, this page delivers verified electrical specs, timing-critical interface roles (e.g., PCLKI/PCLKO skew ≤ +4ns), thermal design guidance for the exposed pad, and validated alternatives for SDH/SONET line-card and add/drop multiplexer designs.
Technical Context
The MAX3890ECB implements a fully integrated phase-locked loop with VCO, prescaler, and loop filter to synthesize a precise 2.488GHz serial clock from low-frequency LVDS reference inputs. Its 16-bit parallel input register latches data on the rising edge of PCLKI, synchronized to PCLKO (2.488GHz ÷ 16 = 155.52MHz) with a defined 0–4ns PCLKO-to-PCLKI skew window.
It integrates three distinct I/O families: LVDS for parallel clock/data (100Ω internal termination), PECL for high-speed serial outputs (50Ω to VCC−2V), and CML for system loopback (SLBO± with 50Ω back-termination to VCC). The SOS-controlled SLBO outputs enable direct connection to deserializer loopback inputs like those on the MAX3880.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Serial Data Rate | 2.488Gbps - matches SONET OC-48 / SDH STM-16 line rate. |
| Parallel Input Rate | 155.52MHz - supports 16-bit wide data aligned to SONET STS-1/STM-1 frame timing. |
| Reference Clock Inputs | 38.88MHz, 51.84MHz, 77.76MHz, or 155.52MHz - selectable via CLKSET pin configuration. |
| Output Jitter (RMS) | 3ps - meets ITU-T G.823/G.825 jitter generation limits for plesiochronous networks. |
| Supply Voltage | +3.0V to +3.6V - single-supply operation compatible with standard 3.3V logic rails. |
| Power Consumption | 495mW - enables thermal management in dense line-card layouts using EP pad soldering. |
| Operating Temperature | -40°C to +85°C - qualified for industrial and telecom central-office environments. |
Pinout & Package
The MAX3890ECB is housed in a 64-pin TQFP with exposed pad (TQFP-EP), measuring 10mm × 10mm × 1mm. The exposed pad must be soldered to a PCB ground plane for thermal integrity and EMI control.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PDI0+ to PDI15+ | Noninverting LVDS parallel data inputs | Accept 16-bit parallel data; internally terminated at 100Ω differential; no external termination required. |
| PCLKI+, PCLKI- | LVDS parallel clock input | Edge-triggered clock for parallel data capture; timing window referenced to PCLKO rising edge (0–4ns skew). |
| SCLKO+, SCLKO- | PECL serial clock output | 2.488GHz clock for downstream receivers; requires 50Ω DC termination to (VCC − 2V) or Thevenin equivalent. |
| SDO+, SDO- | PECL serial data output | Differential 2.488Gbps data stream; matched delay to SCLKO (110–290ps) ensures receiver setup/hold compliance. |
| SLBO+, SLBO- | CML system loopback output | Enabled by TTL-high SOS signal; drives 50Ω transmission line with internal 50Ω back-termination to VCC. |
| RCLK+, RCLK- | LVDS reference clock input | Feeds PLL; amplitude ≥200mV min at 38.88MHz per spec; determines synthesized serial clock accuracy. |
| CLKSET | Reference frequency selection pin | Four-state programming: VCC=155.52MHz, open=77.76MHz, 20kΩ-to-GND=51.84MHz, GND=38.88MHz. |
| EP (Exposed Pad) | Thermal and electrical ground | Must be soldered to PCB ground plane; critical for thermal resistance reduction and noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated PLL with VCO | Eliminates need for external 2.5GHz clock source; synthesizes serial clock directly from low-jitter LVDS references. |
| Multi-standard compliance | Meets ANSI T1.105, ITU-T G.957, and Bellcore GR-253-CORE jitter and waveform specifications for SONET/SDH. |
| LVDS parallel interface | Reduces power vs. CMOS and improves noise immunity; 100Ω internal termination simplifies board layout and eliminates external resistors. |
| System loopback capability | SLBO± outputs enable in-system diagnostics without external test equipment; interoperable with MAX3880 deserializer loopback inputs. |
| Exposed-pad thermal design | Enables <15°C/W junction-to-board thermal resistance when properly soldered-critical for sustained 495mW operation in confined spaces. |
Applications
| 2.5Gbps SDH/SONET Transmission Systems | 2.5Gbps ATM/SONET Access Nodes |
|---|---|
Use Scenario: Line cards in optical transport terminals aggregating multiple STS-1/STM-1 streams into OC-48/STM-16 payloads. IC Role / Device Role / Timing Role: Serializer converting framed parallel data from framer ASICs to serialized PECL output for laser driver ICs. Use Value: Meets G.957 mask compliance with 3ps RMS jitter, ensuring bit-error-rate <1×10⁻¹² over 80km fiber links. |
Use Scenario: Central office DSLAM or MSAN units delivering broadband services over SONET infrastructure. IC Role / Device Role / Timing Role: Interface between ATM segmentation/reassembly (SAR) processors and optical line interface modules. Use Value: LVDS inputs tolerate 1ns rise/fall times and 155.52MHz clock skew, enabling robust inter-ASIC communication in noisy chassis environments. |
| Add/Drop Multiplexers | Digital Cross-Connects |
Use Scenario: Optical ADMs inserting/extracting tributary signals from OC-48 line rates without full demux/mux. IC Role / Device Role / Timing Role: Serializing overhead and payload data for side-band channel insertion; synchronized to line timing via RCLK. Use Value: Four-reference-clock support allows seamless integration with legacy 38.88MHz or modern 155.52MHz timing architectures. |
Use Scenario: High-density DCS shelves performing non-blocking time-slot interchange across multiple OC-48 ports. IC Role / Device Role / Timing Role: Parallel-to-serial conversion for cross-connect switch fabric outputs feeding optical transponders. Use Value: PCLKO-to-PCLKI skew tolerance (0–4ns) simplifies timing closure between switch ASICs and serializer, reducing board-level timing margin analysis effort. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 2.5Gbps telecom serializer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX3891ECB | Same pinout and function but supports extended temperature range (-40°C to +105°C); higher max supply current (250mA vs. 230mA typical). | Required for base station outdoor cabinets or high-ambient industrial deployments where +85°C ambient is exceeded. | Select MAX3891ECB only if operating ambient exceeds +85°C; otherwise MAX3890ECB is cost-optimized for standard telecom environments. |
| LMX2531LQ1725E | PLL-only synthesizer (no serializer logic); generates 2.488GHz clock but lacks parallel-to-serial conversion, LVDS/PECL I/O, or loopback features. | Used only as clock source in custom serializer designs; requires external FPGA or ASIC for data formatting and framing. | Choose LMX2531LQ1725E only when full custom serializer architecture is needed; MAX3890ECB provides complete, standards-compliant solution in one package. |
Compared with MAX3890ECB, MAX3891ECB offers extended temperature capability at higher power cost, while LMX2531LQ1725E provides clock synthesis only-requiring additional components for data serialization, making MAX3890ECB the integrated, drop-in solution for SONET/SDH line-card designs.
Availability
MAX3890ECB is available at Aetrix Electronics and suitable for 2.5Gbps SDH/SONET transmission systems, ATM/SONET access nodes, and digital cross-connect equipment requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for MAX3890ECB 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 MAX3890ECB belongs to Maxim's high-speed communications interface product line, designed specifically to meet stringent SONET/SDH physical layer requirements for telecom infrastructure equipment.
FAQ
What reference clock frequencies does the MAX3890ECB support, and how are they selected?
The MAX3890ECB supports four reference clock frequencies: 38.88MHz, 51.84MHz, 77.76MHz, and 155.52MHz. Selection is controlled by the CLKSET pin: tying CLKSET to VCC selects 155.52MHz, leaving it open selects 77.76MHz, connecting it to GND through a 20kΩ resistor selects 51.84MHz, and grounding it directly selects 38.88MHz. This configuration is confirmed in the MAX3890ECB datasheet Pin Description table and functional diagram.
Does the MAX3890ECB require external termination resistors for its LVDS inputs?
No, the MAX3890ECB does not require external termination for its LVDS inputs-including PCLKI±, RCLK±, and all 16 PDI_± pairs-because it includes internal 100Ω differential input resistance. External termination is only required for PECL outputs (SDO±, SCLKO±) and optional for LVDS outputs (PCLKO±), which must be differentially terminated to 100Ω. This is explicitly stated in the "Low-Voltage Differential-Signal Inputs and Outputs" section of the MAX3890ECB datasheet.
What is the purpose of the SLBO± outputs on the MAX3890ECB, and how are they enabled?
The SLBO± outputs on the MAX3890ECB provide a high-speed CML loopback path for system-level diagnostic testing. They are enabled by applying a TTL logic-high signal to the SOS pin; when SOS is low, SLBO± are disabled. These outputs are designed to connect directly to compatible deserializer loopback inputs such as those on the MAX3880, as documented in the MAX3890ECB "System Loopback" section and Figure 1 functional diagram.
How is thermal management handled for the MAX3890ECB given its 495mW power dissipation?
The MAX3890ECB uses a 64-pin TQFP package with an exposed pad (EP) that must be soldered directly to a PCB ground plane to achieve adequate thermal performance. This construction provides a low-thermal-resistance path from die to board, enabling reliable operation at 495mW within the -40°C to +85°C range. The datasheet specifies that failure to solder the EP pad compromises both thermal integrity and EMI performance, as detailed in the "Exposed Pad (EP) Package" subsection.
What is the maximum allowable PCLKO-to-PCLKI timing skew for reliable operation of the MAX3890ECB?
The MAX3890ECB specifies a PCLKO-to-PCLKI skew window of 0 to +4ns, meaning the rising edge of the parallel clock input (PCLKI) must occur no earlier than the rising edge of the parallel clock output (PCLKO) and no later than 4ns after it. This timing constraint ensures proper latching of the 16-bit parallel data into the internal register and is validated across temperature and voltage per AC Electrical Characteristics tables in the MAX3890ECB datasheet.
MAX3890ECB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 64-TQFP Exposed Pad
- Packaging:
- Bulk
- Product Status:
- Active
- Function:
- Serializer
- Data Rate:
- 2.5Gbps
- Input Type:
- LVDS
- Output Type:
- PECL
- Number of Inputs:
- 16
- Number of Outputs:
- 1
- Voltage - Supply:
- 3V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 64-TQFP-EP (10x10)
MAX3890ECB FAQ
1.How can I place an order for MAX3890ECB through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX3890ECB 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 MAX3890ECB reliable?
The price and inventory of MAX3890ECB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX3890ECB is usually 5 days.
3.What payment methods are accepted for MAX3890ECB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX3890ECB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX3890ECB?
MAX3890ECB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX3890ECB 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 MAX3890ECB?
For technical support, including MAX3890ECB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX3890ECB requirements.
6.How does Aetrix verify that MAX3890ECB is sourced from the original manufacturer or authorized distributors?
All MAX3890ECB 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 MAX3890ECB meets industry standards.
7.What is the process for return or replacement of MAX3890ECB?
All MAX3890ECB units undergo pre-shipment inspection (PSI). If there is an issue with MAX3890ECB, 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 MAX3890ECB part is unused and in its original packaging.
Return procedure for MAX3890ECB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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