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Analog Devices Inc./Maxim Integrated MAX3691ECJ
- Part No.:
- MAX3691ECJ
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Serializers, Deserializers
- Package:
- 32-LQFP
- Datasheet:
-
MAX3691ECJ.pdf
- Description:
- SDH/SONET 1:4 DESERIALIZER
- Quantity:
- Payment:
- Shipping:
Inventory:488
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Product details
Overview
The MAX3691ECJ from Maxim Integrated is a 4:1 parallel-to-serial serializer IC designed for SDH/SONET OC-12 and ATM physical-layer transmission. It converts 4-bit, 155.52MHz parallel data into a 622.08Mbps PECL serial stream using an integrated PLL clock synthesizer, accepts LVDS inputs, operates from a single +3.3V supply, and is rated for -40°C to +85°C industrial temperature range.
For engineers reviewing the MAX3691ECJ datasheet, MAX3691ECJ pinout, MAX3691ECJ application, or MAX3691ECJ equivalent, key selection considerations include its 622Mbps PECL output compliance, LVDS input termination architecture, PCLKO-to-PCLKI skew tolerance (-0.7ns to +3.3ns), and TQFP-32 package compatibility with high-speed backplane timing constraints.
Technical Context
The MAX3691ECJ implements a fully integrated PLL-based frequency synthesizer that locks to a 155.52MHz LVDS reference clock (RCLK±) to generate an internal 622.08MHz serial clock. Its 4-bit parallel input register latches data on the rising edge of the LVDS PCLKI± signal, while the 4-bit shift register drives the differential PECL SD± outputs.
Timing integrity is maintained via a synthesized PCLKO± output (622.08MHz ÷ 4 = 155.52MHz), which clocks overhead management circuitry and defines a ±3.3ns allowable skew window relative to PCLKI±. The device uses internally terminated 100Ω LVDS inputs and requires external 50Ω DC termination to (VCC − 2V) for PECL outputs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Serial Data Rate | 622.08 Mbps - matches OC-12/STM-4 line rate for SDH/SONET compliance |
| Parallel Input Rate | 155.52 MHz - supports standard SONET STS-3c/STM-1 frame timing |
| Supply Voltage | +3.3 V ±10% - single-rail operation simplifies power delivery in telecom line cards |
| Input Interface | LVDS (PCLKI±, PD0±–PD3±, RCLK±) - 100Ω internal differential termination eliminates external resistors |
| Output Interface | 3.3V PECL (SD±) - requires 50Ω DC termination to (VCC − 2V) for valid logic levels |
| PLL Reference Input | 155.52 MHz LVDS - enables jitter-clean serial clock synthesis without external oscillator |
| Output Jitter | 13 psRMS Φ₀ - meets GR-253-CORE jitter mask requirements for OC-12 transmitters |
Pinout & Package
The MAX3691ECJ is housed in a 32-pin Thin Quad Flat Package (TQFP), 7mm × 7mm × 1.4mm body, with exposed thermal pad (not electrically connected). Pin pitch is 0.5mm; lead finish is lead-free (RoHS-compliant).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PD0±–PD3± (pins 1–8) | LVDS parallel data inputs | Differential 4-bit bus latched on PCLKI+ rising edge; internally terminated at 100Ω |
| PCLKI± (pins 30, 31) | LVDS parallel clock input | Defines data capture timing; skew window vs. PCLKO± is -0.7ns to +3.3ns |
| RCLK± (pins 26, 27) | LVDS reference clock input | 155.52MHz crystal-referenced input for PLL lock; AC-coupled per datasheet |
| PCLKO± (pins 10, 11) | LVDS parallel clock output | Synthesized 155.52MHz clock (622.08MHz ÷ 4); used for overhead management sync |
| SD± (pins 14, 15) | PECL serial data output | 622.08Mbps differential output requiring 50Ω termination to (VCC − 2V) |
| FIL± (pins 22, 23) | PLL loop filter interface | Connects external RC network to set PLL bandwidth and stability per Figure 1 |
Key Features
| Feature | Design Value |
|---|---|
| Integrated PLL clock synthesis | Eliminates need for external 622MHz oscillator; reduces BOM count and board area in OC-12 line interfaces |
| LVDS input termination | 100Ω internal differential termination removes requirement for 8 external 100Ω resistors on 4-bit data + clock lines |
| PECL output compliance | Meets ECLINPS-3 standard voltage levels and drive strength for direct connection to fiber-optic laser drivers |
| Low-power operation | 215mW typical supply current enables dense placement in multi-channel SONET add/drop multiplexers |
| Industrial temperature range | -40°C to +85°C rating ensures stable timing performance in uncontrolled telecom equipment enclosures |
Applications
| 622Mbps SDH/SONET Transmission Systems | 622Mbps ATM/SONET Access Nodes |
|---|---|
Use Scenario: Line-side interface in OC-12 framer-to-laser-driver path for metro optical transport. IC Role / Device Role / Timing Role: Serializer converting framed STS-3c payload + overhead bytes into 622Mbps serial stream synchronized to network master clock. Use Value: Integrated 155.52MHz→622.08MHz PLL eliminates external clock generator, reducing jitter accumulation across the timing chain. | Use Scenario: Aggregation point in DSLAM or MSAN where multiple ATM cells are multiplexed onto a SONET OC-12 uplink. IC Role / Device Role / Timing Role: Physical-layer serializer aligning asynchronous ATM cell boundaries to synchronous SONET frame structure. Use Value: LVDS input interface allows direct connection to FPGA-based ATM segmentation/reassembly logic without level-shifting. |
| Add/Drop Multiplexers | Digital Cross Connects |
Use Scenario: Channel extraction node inserting/dropping individual VC-4 containers from OC-12 line rate. IC Role / Device Role / Timing Role: Re-timing serializer driving local switch fabric with jitter-clean 622Mbps stream derived from line-recovered clock. Use Value: PCLKO± output provides phase-aligned 155.52MHz clock for overhead processor, ensuring deterministic latency between payload and management paths. | Use Scenario: High-density DCS shelf interconnecting OC-3/OC-12 tributaries across switching matrices. IC Role / Device Role / Timing Role: Format converter translating parallel backplane data into serial line-side signals with precise skew control. Use Value: -0.7ns to +3.3ns PCLKO-to-PCLKI skew window enables robust timing margin under temperature and voltage variation in multi-slot chassis. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 4:1 serializer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX3690ECJ | Same 32-pin TQFP package and LVDS/PECL I/O, but lacks integrated PLL; requires external 622MHz clock source | Used where system already provides low-jitter 622MHz reference, avoiding PLL design complexity | Select MAX3690ECJ only if external clock distribution infrastructure exists and jitter budget permits added source |
| ICS8430AYI | LVDS-to-PECL serializer with integrated PLL, but supports 1.25Gbps; no native 155.52MHz reference lock mode | Applicable in higher-rate systems (e.g., Gigabit Ethernet PHY), not SONET/SDH frame-aligned designs | Choose ICS8430AYI only when migrating beyond OC-12 or when 155.52MHz reference is unavailable |
Compared with MAX3690ECJ and ICS8430AYI, the MAX3691ECJ uniquely combines SONET-specific 155.52MHz reference locking, integrated 4:1 serialization, and guaranteed -40°C to +85°C operation in a single TQFP-32 package-making it the only drop-in solution for legacy OC-12 framer interfaces requiring minimal layout change.
Availability
MAX3691ECJ is available at Aetrix Electronics and suitable for 622Mbps SDH/SONET transmission systems, ATM/SONET access nodes, and digital cross-connect applications requiring stable component supply over extended product lifecycles.
Supply support for MAX3691ECJ 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 solutions for communications, computing, and industrial markets.
The MAX3691ECJ belongs to Maxim's telecom physical-layer interface product line, engineered specifically for SONET/SDH OC-12 and ATM layer-1 serialization with strict jitter and timing compliance.
FAQ
What is the primary function of the MAX3691ECJ in a SONET system?
The MAX3691ECJ serves as a 4:1 parallel-to-serial serializer that converts 4-bit-wide, 155.52MHz parallel data into a 622.08Mbps PECL serial output for OC-12 line transmission. It integrates a PLL to synthesize the 622.08MHz serial clock from the 155.52MHz reference, enabling frame-aligned serialization without external high-frequency clock sources. This function is central to the MAX3691ECJ's role in SONET framer-to-laser driver signal chains.
Does the MAX3691ECJ require external termination resistors on its LVDS inputs?
No, the MAX3691ECJ does not require external termination resistors on its LVDS inputs (PD0±–PD3±, PCLKI±, RCLK±). The device features internally matched 100Ω differential input resistance, as confirmed in the "LVDS Inputs and Outputs" section of the datasheet. External termination is only required on the PECL SD± outputs (50Ω to VCC − 2V) and optionally on the PCLKO± outputs (100Ω differential).
What is the allowable timing skew between PCLKO and PCLKI for reliable operation of the MAX3691ECJ?
The MAX3691ECJ specifies a PCLKO-to-PCLKI skew window of -0.7ns to +3.3ns, meaning the rising edge of PCLKI must occur within that time interval relative to the rising edge of PCLKO. This window ensures proper setup and hold timing for the parallel input register and is validated across the full -40°C to +85°C operating range. Maintaining this skew is critical for deterministic data capture in the MAX3691ECJ.
Can the MAX3691ECJ operate with a reference clock other than 155.52MHz?
No-the MAX3691ECJ's PLL is designed and characterized exclusively for 155.52MHz LVDS reference input (RCLK±) to generate the precise 622.08Mbps serial output required for SONET OC-12 compliance. The datasheet does not specify operation or performance guarantees at other reference frequencies, and deviation would violate the device's intended use case and timing specifications defined for the MAX3691ECJ.
What package type and lead finish does the MAX3691ECJ use?
The MAX3691ECJ is packaged in a 32-pin Thin Quad Flat Package (TQFP) with 7mm × 7mm body and 0.5mm pitch. It uses a lead-free (RoHS-compliant) finish, denoted by the "+" suffix in the ordering code MAX3691ECJ+. The package includes an exposed thermal pad, though the datasheet confirms it is not electrically connected and may be left floating or grounded for thermal enhancement.
MAX3691ECJ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 32-LQFP
- Packaging:
- Bulk
- Product Status:
- Active
- Function:
- Serializer
- Data Rate:
- 622Mbps
- Input Type:
- LVDS
- Output Type:
- PECL
- Number of Inputs:
- 4
- 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:
- 32-TQFP (7x7)
MAX3691ECJ FAQ
1.How can I place an order for MAX3691ECJ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX3691ECJ 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 MAX3691ECJ reliable?
The price and inventory of MAX3691ECJ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX3691ECJ is usually 5 days.
3.What payment methods are accepted for MAX3691ECJ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX3691ECJ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX3691ECJ?
MAX3691ECJ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX3691ECJ 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 MAX3691ECJ?
For technical support, including MAX3691ECJ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX3691ECJ requirements.
6.How does Aetrix verify that MAX3691ECJ is sourced from the original manufacturer or authorized distributors?
All MAX3691ECJ 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 MAX3691ECJ meets industry standards.
7.What is the process for return or replacement of MAX3691ECJ?
All MAX3691ECJ units undergo pre-shipment inspection (PSI). If there is an issue with MAX3691ECJ, 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 MAX3691ECJ part is unused and in its original packaging.
Return procedure for MAX3691ECJ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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