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Analog Devices Inc./Maxim Integrated MAX3640UCM
- Part No.:
- MAX3640UCM
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Specialized
- Package:
- 48-LQFP
- Datasheet:
-
MAX3640UCM.pdf
- Description:
- IC INTERFACE SPECIALIZED 48LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:4,903
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Product details
Overview
The MAX3640UCM from Maxim Integrated is a dual-path, 4:2 LVDS crosspoint switch optimized for OC-12 (622Mbps) backplane interconnects. It provides two independent signal paths with input buffers, multiplexing, crosspoint routing, and differential output drivers; supports LVDS I/O, 2.8psRMS random jitter, 110ps channel-to-channel skew, and operates from a single +3.3V supply at 0°C to +85°C.
For engineers reviewing the MAX3640UCM datasheet, MAX3640UCM pinout, MAX3640UCM application, or MAX3640UCM equivalent, key selection criteria include deterministic jitter (42ps), power-down capability per output bank, LVDS input termination (100Ω differential), TTL control interface (SEL/ENA/ENB), and TQFP-48 package compatibility for high-density SONET/SDH backplanes.
Technical Context
The MAX3640UCM implements two independent 4:2 crosspoint data paths, each selectable via IN_SEL and controlled by four TTL SEL pins per path. Routing is fully configurable per Table 1-e.g., DIA1/DIA2 routed to DOA1/DOA2 when IN_SEL=1 and SEL1–SEL2=00/01.
Each path features internally terminated LVDS inputs (100Ω differential), rail-to-rail LVDS outputs with 250–400mV swing, and separate ENA/ENB enables that power down entire output banks (reducing ICC by 165mW). Output disable time is 66ns; propagation delay is 2.5ns.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Data Rate | 622Mbps - supports OC-12 SONET line rate without retiming |
| Output Jitter (RMS) | 2.8ps - ensures clean eye opening at 622Mbps over backplane traces |
| Channel Skew | 110ps - maintains timing alignment across all eight LVDS output pairs |
| Supply Voltage | +3.3V ±10% - compatible with standard logic rails; no dual-supply required |
| Power (4 outputs) | 257mW - enables thermal management in dense backplane modules |
| Input Termination | 100Ω differential - eliminates need for external termination resistors on LVDS inputs |
| Output Enable Time | 266ns - allows synchronous activation of output banks during system initialization |
Pinout & Package
The MAX3640UCM is housed in a 48-pin TQFP (Thin Quad Flat Package) with 0.5mm pitch, thermally enhanced for industrial temperature operation (0°C to +85°C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| DIA1+ / DIA1− to DIA4+ / DIA4− | LVDS Channel-A Input Pairs | Four differential inputs for primary data stream; internally terminated |
| DIB1+ / DIB1− to DIB4+ / DIB4− | LVDS Channel-B Input Pairs | Four differential inputs for secondary/redundant data stream |
| DOA1+ / DOA1− to DOA4+ / DOA4− | LVDS Channel-A Output Pairs | Four routed outputs enabled/disabled by ENA; high-impedance when disabled |
| DOB1+ / DOB1− to DOB4+ / DOB4− | LVDS Channel-B Output Pairs | Four routed outputs enabled/disabled by ENB; high-impedance when disabled |
| SEL1–SEL4 | TTL Crosspoint Select Inputs | Control 2×2 switch matrix per path; define source-to-output mapping per Table 1 |
| ENA / ENB | TTL Output Bank Enables | Power down respective output banks (165mW savings) and place outputs in high-Z state |
| IN_SEL | TTL Input Path Selector | Selects between DIAx (IN_SEL=high) or DIBx (IN_SEL=low) as input source for both paths |
| VCC / GND | Power & Ground | Single +3.3V supply; multiple VCC/GND pins reduce supply noise and improve PSRR |
Key Features
| Feature | Design Value |
|---|---|
| Dual 4:2 crosspoint architecture | Enables flexible A/B input source selection and independent routing per output bank for redundancy or fan-out |
| Per-bank power-down (ENA/ENB) | Reduces total supply current by 165mW when one output set is inactive-critical for thermal budget in multi-switch systems |
| Internally terminated LVDS inputs | Eliminates four external 100Ω differential terminators per device, saving PCB area and BOM cost |
| 2.8psRMS + 42ps DJ jitter performance | Meets OC-12 jitter accumulation budgets for multi-hop backplane links without CDR intervention |
| 110ps channel-to-channel skew | Preserves parallel data validity across all eight outputs-enables reliable 8-bit wide LVDS bus transmission |
Applications
| SONET/SDH Backplanes | High-Speed Parallel Links |
|---|---|
Use Scenario: Interconnecting OC-12 line cards in telecom shelf backplanes with minimal jitter accumulation across multiple switch hops. IC Role / Device Role / Timing Role: Dual-path LVDS crosspoint switch providing signal path redundancy and dynamic routing between upstream/downstream transceivers. Use Value: 2.8psRMS jitter and 110ps skew ensure compliant eye diagrams after ≥3 cascaded MAX3640UCM devices in a full-mesh backplane. | Use Scenario: Routing parallel 622Mbps data streams between FPGA mezzanine cards and central switching fabric in test equipment. IC Role / Device Role / Timing Role: High-speed LVDS multiplexer and fan-out buffer enabling reconfigurable interconnect without signal integrity degradation. Use Value: 240ps edge speed and 250–400mV LVDS swing maintain >300mV noise margin across 15cm FR4 traces at 622Mbps. |
| Digital Cross-Connects | ATM Switch Cores |
Use Scenario: Implementing non-blocking 4×2 signal routing in modular digital cross-connect systems requiring hot-swap reconfiguration. IC Role / Device Role / Timing Role: Reconfigurable LVDS switch with TTL control (SEL/ENA/ENB) enabling real-time path changes without reset. Use Value: 66ns output disable time and 266ns enable time support sub-microsecond re-routing for service-level SLA compliance. | Use Scenario: Aggregating ATM cell streams from multiple line interfaces into a centralized switching core operating at OC-12 rates. IC Role / Device Role / Timing Role: Low-skew, low-jitter LVDS interface bridging between physical layer PHYs and ATM segmentation/reassembly logic. Use Value: Differential LVDS I/O rejects common-mode noise from adjacent switching circuits-critical in high-density ATM chassis. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LVDS crosspoint switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX3641UCM | Same pinout, identical architecture, but rated for -40°C to +85°C industrial temp range | Suitable for extended-temperature base station or outdoor telecom equipment | Select MAX3641UCM when operating below 0°C ambient is required; otherwise MAX3640UCM is optimal for commercial-grade systems |
| TI SN65LVDS386 | Single 4:2 LVDS crosspoint (not dual-path); no IN_SEL or per-bank enable; 3.3V only; 622Mbps rated | Limited to single-path routing; lacks redundancy and power-down capability | Choose SN65LVDS386 only for cost-sensitive, single-stream applications where dual-path flexibility and power gating are unnecessary |
Compared with MAX3641UCM, the MAX3640UCM trades extended temperature range for lower cost and same electrical performance; versus SN65LVDS386, it adds dual-path routing, input selection, and per-bank power control-enabling true redundancy and dynamic reconfiguration in mission-critical backplanes.
Availability
The MAX3640UCM is available at Aetrix Electronics and suitable for SONET/SDH backplanes, high-speed parallel links, and digital cross-connects requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for MAX3640UCM 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 interface ICs for communications, computing, and industrial systems.
The MAX3640UCM belongs to Maxim's high-speed LVDS interface product line, engineered specifically for jitter-sensitive OC-12 backplane interconnects and redundant digital cross-connect architectures.
FAQ
What is the maximum data rate supported by the MAX3640UCM?
The MAX3640UCM supports a maximum data rate of 622Mbps, matching the OC-12 SONET standard. This is confirmed in the Absolute Maximum Ratings and AC Electrical Characteristics sections of the official datasheet, where all timing parameters-including propagation delay (2.5ns), rise/fall time (150–350ps), and jitter-are specified at 622Mbps under load conditions of 100Ω differential termination.
Does the MAX3640UCM require external termination resistors on its LVDS inputs?
No, the MAX3640UCM does not require external termination resistors on its LVDS inputs. As stated in the "LVDS Inputs and Outputs" section and verified in Figure 4 (LVDS Input Model), the device features internal 100Ω differential termination between each input pair (e.g., DIA1+/DIA1−), eliminating the need for external components and simplifying PCB layout.
How does the power-down feature of the MAX3640UCM reduce power consumption?
The MAX3640UCM reduces power consumption by 165mW when a set of four output channels is deselected. This is achieved via the ENA and ENB pins: driving ENA low powers down the DOA1–DOA4 output bank, while ENB low disables DOB1–DOB4. The datasheet confirms this savings occurs due to complete shutdown of the associated output drivers-not just high-Z assertion.
What is the function of the IN_SEL pin on the MAX3640UCM?
The IN_SEL pin on the MAX3640UCM selects the active input source for both crosspoint paths: when IN_SEL = high (or tied to VCC), the DIA1–DIA4 inputs are routed through the switch; when IN_SEL = low (or tied to GND), the DIB1–DIB4 inputs are selected. This enables seamless switchover between primary and backup data streams without changing SEL pin states.
Can the MAX3640UCM be used with LVPECL sources?
Yes, the MAX3640UCM can interface with LVPECL sources using the resistor network shown in Figure 3 of the datasheet. The network (182Ω to VCC and 48Ω to ground per leg) shifts and attenuates the LVPECL signal to fall within the MAX3640UCM's LVDS input voltage range (0–2400mV common-mode, ±100mV differential threshold), ensuring reliable detection without level-shifting ICs.
MAX3640UCM Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 48-LQFP
- Packaging:
- Tray
- Product Status:
- Obsolete
- Applications:
- Data Transport
- Interface:
- LVDS
- Voltage - Supply:
- 3V ~ 3.6V
- Supplier Device Package:
- 48-LQFP (7x7)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
MAX3640UCM FAQ
1.How can I place an order for MAX3640UCM through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX3640UCM 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 MAX3640UCM reliable?
The price and inventory of MAX3640UCM are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX3640UCM is usually 5 days.
3.What payment methods are accepted for MAX3640UCM?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX3640UCM transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX3640UCM?
MAX3640UCM orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX3640UCM 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 MAX3640UCM?
For technical support, including MAX3640UCM datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX3640UCM requirements.
6.How does Aetrix verify that MAX3640UCM is sourced from the original manufacturer or authorized distributors?
All MAX3640UCM 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 MAX3640UCM meets industry standards.
7.What is the process for return or replacement of MAX3640UCM?
All MAX3640UCM units undergo pre-shipment inspection (PSI). If there is an issue with MAX3640UCM, 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 MAX3640UCM part is unused and in its original packaging.
Return procedure for MAX3640UCM:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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