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Analog Devices Inc./Maxim Integrated MAX3620BETT
- Part No.:
- MAX3620BETT
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Delay Lines
- Package:
- 6-WDFN Exposed Pad
- Datasheet:
-
MAX3620BETT.pdf
- Description:
- DELAY LINES - CLOCK DISTRIBUTION
- Quantity:
- Payment:
- Shipping:
Inventory:6,762
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Product details
Overview
MAX3620BETT from Maxim Integrated is a passive, dual-channel 1.00ns delay line for QDR/QDRII memory clock distribution, supporting HSTL source-terminated transmission with 50Ω single-ended or 100Ω differential lines, and delivering precise quarter-clock-phase delay in high-speed synchronous memory systems.
For engineers reviewing the MAX3620BETT datasheet, MAX3620BETT pinout, MAX3620BETT application, or MAX3620BETT equivalent, key selection criteria include guaranteed 1.00ns ±0.10ns delay accuracy at 250MHz clock frequency, <±20ps inter-channel delay matching, and compatibility with 3mm × 3mm TDFN-6 package layout constraints.
Technical Context
The MAX3620BETT implements a distributed L-C transmission-line architecture with symmetrical 50Ω input/output impedance, enabling stable signal integrity without active components or biasing. Its all-passive design eliminates power supply requirements and DC path dependencies.
It operates with HSTL-compliant voltage swing (±1.5V), supports open-circuit unused terminals in single-ended mode, and maintains specified delay performance across -40°C to +85°C ambient temperature with load capacitance ≤5pF and load resistance ≥20kΩ.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Delay Value | 1.00ns ±0.10ns - precisely generates 90° phase shift of QDR/QDRII system clock at 250MHz operation |
| Delay Matching | ±20ps - ensures tight skew control between dual channels for multiphase clock alignment |
| Characteristic Impedance | 50Ω - matches standard PCB trace impedance for minimal reflection in single-ended HSTL systems |
| Cutoff Frequency | 370MHz - supports full bandwidth operation up to 250MHz clock frequency with margin |
| Insertion Loss | 2.1dB - preserves signal amplitude integrity over 1.00ns delay path with source termination only |
| Input/Output Return Loss | ≥12dB / ≥15dB (50–1000MHz) - ensures robust VSWR performance across high-speed memory bus frequencies |
| Operating Temperature | -40°C to +85°C - qualified for industrial-grade embedded memory subsystems |
Pinout & Package
MAX3620BETT is housed in a 3mm × 3mm, 0.8mm height thin DFN (TDFN-6) package with exposed thermal pad (EP), requiring connection to COMMON potential. The package is JEDEC MO-229 compliant (PKG code T633-2) and optimized for high-density memory module layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 IN1 | Single-ended input channel 1 | Accepts HSTL clock signal; unused inputs may be left floating in single-ended configuration |
| 2 COMMON | Reference ground node | Common return path for both delay channels; EP must be soldered to same net |
| 3 IN2 | Single-ended input channel 2 | Independent input for second delay path; enables dual-phase generation without external splitting |
| 4 OUT2 | Single-ended output channel 2 | Delivers 1.00ns-delayed replica of IN2; electrically isolated from OUT1 path |
| 5 COMMON | Reference ground node | Second COMMON terminal - must be tied to same potential as Pin 2 and EP |
| 6 OUT1 | Single-ended output channel 1 | Delivers 1.00ns-delayed replica of IN1; used for 90° or 270° phase-shifted clock outputs |
Key Features
| Feature | Design Value |
|---|---|
| All-passive L-C architecture | No power supply or bias required; eliminates DC path, leakage, and supply noise coupling |
| HSTL source-termination support | Optimized for 50Ω single-ended or 100Ω differential transmission lines with unterminated receivers |
| Dual independent delay paths | Two matched 1.00ns delay lines in one die enable simultaneous 0°/90°/180°/270° clock phasing |
| Small-footprint TDFN-6 package | 3mm × 3mm area saves board space in memory module edge connectors and SoC proximity zones |
| High-frequency return loss | ≥12dB input / ≥15dB output up to 1GHz ensures signal fidelity in DDR-class timing paths |
Applications
| QDR II SRAM Clock Distribution | Multiphase Clock Generation |
|---|---|
Use Scenario: Distributing synchronized clock signals across multiple QDR II SRAM devices on a memory module with strict skew budgets. IC Role / Device Role / Timing Role: Passive delay element generating precise 90° and 270° phase-shifted clocks from master 0° reference. Use Value: Enables quad-data-rate sampling without external PLLs or complex FPGA logic, reducing jitter accumulation and layout complexity. |
Use Scenario: Generating four-phase (0°, 90°, 180°, 270°) clocks for high-speed serializer/deserializer interfaces. IC Role / Device Role / Timing Role: Dual-path passive delay block providing matched 1.00ns delays for deterministic phase relationships. Use Value: Eliminates need for active clock synthesizers in cost-sensitive, low-power embedded controllers where phase accuracy >±20ps is mandatory. |
| Memory Subsystem Skew Compensation | HSTL-Compatible Timing Reference |
Use Scenario: Compensating for trace-length mismatch between CPU and memory controller clock nets in industrial SoM designs. IC Role / Device Role / Timing Role: Fixed-delay calibration element inserted in longer clock path to equalize propagation time. Use Value: Achieves sub-50ps inter-device skew without re-spinning PCB, supporting JEDEC-compliant QDR timing windows. |
Use Scenario: Providing clean, low-jitter clock references to HSTL-input peripherals such as network PHYs or FPGAs. IC Role / Device Role / Timing Role: Impedance-matched passive buffer/delay stage preserving signal edge rate and amplitude. Use Value: Maintains HSTL VIH/VIL margins under 250MHz operation while adding deterministic 1.00ns latency for timing closure. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar passive delay line applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX3620AETT | 0.75ns nominal delay (±0.10ns), 333MHz max clock frequency, 2.5dB insertion loss | Better suited for higher-frequency QDR systems requiring shorter phase offset | Select when 0.75ns delay aligns with target 66.7ps/unit clock period (e.g., 333MHz QDR) |
| MAX3620CETT | 1.25ns nominal delay (±0.10ns), 200MHz max clock frequency, 3.1dB insertion loss | Preferred for lower-frequency QDRII systems needing larger quarter-cycle phase spacing | Choose for 200MHz QDRII where 1.25ns provides exact 90° phase shift at reduced bandwidth demand |
Compared with MAX3620AETT and MAX3620CETT, the MAX3620BETT offers optimal balance of delay precision (1.00ns), bandwidth (250MHz), and insertion loss (2.1dB) for mainstream QDR II memory clocking at 250MHz, avoiding overdesign or insufficient phase resolution.
Availability
MAX3620BETT is available at Aetrix Electronics and suitable for QDR II memory modules, multiphase clock generators, and HSTL timing reference circuits requiring stable component supply, consistent parametric performance, and long-term industrial lifecycle support.
Supply support for MAX3620BETT 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 power management ICs for industrial, communications, and computing applications.
The MAX3620 series belongs to Maxim's high-speed timing and interface product line, designed specifically to replace discrete LC networks in QDR/QDRII memory clock distribution with factory-trimmed, temperature-stable passive delay solutions.
FAQ
What is the exact delay value and tolerance of the MAX3620BETT?
The MAX3620BETT delivers a nominal delay of 1.00ns with a guaranteed tolerance of ±0.10ns under specified conditions (ZLOAD = ZSOURCE = 50Ω, 25°C, 300ps input transition time). This 1.00ns value is factory-trimmed and remains stable across -40°C to +85°C operating temperature, making it suitable for precise quarter-clock-phase generation in QDR II systems.
Does the MAX3620BETT require a power supply or bias voltage?
No, the MAX3620BETT is an all-passive device constructed from distributed L-C sections and requires no power supply, bias current, or DC path. It operates purely as a transmission-line delay element, eliminating power-related noise, startup delay, and supply regulation concerns-ideal for low-noise clock distribution paths.
Can the MAX3620BETT be used in differential signaling configurations?
Yes, the MAX3620BETT is compatible with 100Ω differential transmission lines, as confirmed in its features and electrical specifications. While its pinout supports single-ended use (IN1/IN2/OUT1/OUT2 referenced to COMMON), the matched 50Ω per-side impedance allows implementation in differential pairs when driven and terminated appropriately.
What is the maximum recommended clock frequency for reliable operation of the MAX3620BETT?
The MAX3620BETT is rated for reliable operation up to 250MHz, as specified in Table 1 of its datasheet under "Clock Frequency." This rating accounts for insertion loss (2.1dB), return loss (>12dB), and delay stability across process, voltage, and temperature-ensuring robust performance in QDR II memory interfaces.
How should the exposed pad (EP) of the MAX3620BETT be connected on the PCB?
The exposed pad (EP) of the MAX3620BETT must be connected to the same electrical potential as the COMMON pins (Pins 2 and 5), typically the system ground plane. This connection is mandatory for thermal performance, signal reference integrity, and compliance with the device's absolute maximum ratings-failure to do so may cause instability or damage.
MAX3620BETT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 6-WDFN Exposed Pad
- Packaging:
- Bulk
- Product Status:
- Active
- Number of Taps/Steps:
- -
- Function:
- Multiple
- Delay to 1st Tap:
- -
- Tap Increment:
- -
- Available Total Delays:
- 1ns
- Number of Independent Delays:
- 2
- Voltage - Supply:
- -1.5V ~ 1.5V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 6-TDFN (3x3)
MAX3620BETT FAQ
1.How can I place an order for MAX3620BETT through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX3620BETT 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 MAX3620BETT reliable?
The price and inventory of MAX3620BETT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX3620BETT is usually 5 days.
3.What payment methods are accepted for MAX3620BETT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX3620BETT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX3620BETT?
MAX3620BETT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX3620BETT 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 MAX3620BETT?
For technical support, including MAX3620BETT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX3620BETT requirements.
6.How does Aetrix verify that MAX3620BETT is sourced from the original manufacturer or authorized distributors?
All MAX3620BETT 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 MAX3620BETT meets industry standards.
7.What is the process for return or replacement of MAX3620BETT?
All MAX3620BETT units undergo pre-shipment inspection (PSI). If there is an issue with MAX3620BETT, 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 MAX3620BETT part is unused and in its original packaging.
Return procedure for MAX3620BETT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX3620BETT Tags
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LTC6994CS6-1#TRMPBF
Analog Devices Inc.
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Analog Devices Inc.
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Analog Devices Inc.
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DS1124U-25+T
Analog Devices Inc./Maxim Integrated
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