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Analog Devices Inc./Maxim Integrated MAX3620AETT
- Part No.:
- MAX3620AETT
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Delay Lines
- Package:
- 6-WDFN Exposed Pad
- Datasheet:
-
MAX3620AETT.pdf
- Description:
- DELAY LINES - CLOCK DISTRIBUTION
- Quantity:
- Payment:
- Shipping:
Inventory:6,533
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Product details
Overview
MAX3620AETT from Maxim Integrated is a passive, dual-channel HSTL-compatible delay line optimized for quarter-clock phase generation in QDR/QDRII memory systems. It delivers a precise 0.75ns nominal delay per channel, supports 50Ω single-ended and 100Ω differential transmission lines, features all-passive L-C architecture, and operates across -40°C to +85°C in a 6-pin TDFN (3mm × 3mm) package.
For engineers reviewing the MAX3620AETT datasheet, MAX3620AETT pinout, MAX3620AETT application, or MAX3620AETT equivalent, this page provides verified delay matching (±20ps), insertion loss (2.5dB typical), cutoff frequency (450MHz), input/output return loss (12/15dB), and load-capacitance-dependent delay stability - critical for high-speed clock distribution integrity.
Technical Context
The MAX3620AETT implements a distributed LC transmission-line structure with symmetrical 50Ω characteristic impedance at each terminal, enabling stable signal propagation without active components. Its passive design eliminates power supply requirements and DC bias dependencies, supporting true HSTL source-terminated signaling with unterminated receivers.
It provides two independent delay paths (IN1→OUT1 and IN2→OUT2), each delivering identical 0.75ns nominal delay under matched 50Ω source/load conditions. Delay matching between channels is tightly controlled to ±20ps, ensuring sub-cycle timing alignment essential for multiphase clock synthesis in QDR II SRAM interfaces.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Delay | 0.75ns per channel - enables accurate 90° phase shift generation for QDR/QDRII clock quadrature. |
| Delay Matching | ±20ps - ensures tight inter-channel timing alignment for simultaneous multiphase clock outputs. |
| Characteristic Impedance | 50Ω - matches standard PCB trace impedance for minimal reflection in single-ended HSTL systems. |
| Insertion Loss | 2.5dB typical - preserves signal amplitude integrity over full operating bandwidth up to 450MHz. |
| Cutoff Frequency | 450MHz - supports reliable operation at QDR II clock frequencies up to 333MHz (1.5× fundamental). |
| Input Return Loss | 12dB (50MHz–1GHz) - maintains signal fidelity by minimizing input reflections under HSTL drive conditions. |
| Operating Temperature | -40°C to +85°C - qualified for industrial-grade embedded memory subsystems and networking equipment. |
Pinout & Package
MAX3620AETT is housed in a 6-pin Thin Dual Flat No-lead (TDFN) package measuring 3mm × 3mm × 0.8mm, with an exposed thermal pad (EP) that must be connected to COMMON potential. The package is moisture-sensitive level 1 (MSL-1) and RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (IN1) | Single-ended input channel 1 | Accepts HSTL-level clock signal; unused inputs must remain open in single-ended mode. |
| 2 (COMMON) | Reference ground node | Common return path for both channels; EP must be soldered to same net. |
| 3 (IN2) | Single-ended input channel 2 | Independent second input for dual-phase or redundant clock routing. |
| 4 (OUT2) | Single-ended output channel 2 | Delivers 0.75ns-delayed copy of IN2; electrically isolated from OUT1 path. |
| 5 (COMMON) | Reference ground node | Second COMMON connection point; internally tied to Pin 2 and EP. |
| 6 (OUT1) | Single-ended output channel 1 | Delivers 0.75ns-delayed copy of IN1; used for primary 90° phase-shifted clock output. |
Key Features
| Feature | Design Value |
|---|---|
| All-passive LC architecture | Zero power consumption, no DC biasing, immunity to supply noise, and guaranteed monotonic group delay. |
| HSTL source-termination support | Enables direct interface with HSTL drivers without external termination resistors at receiver end. |
| 50Ω single-ended / 100Ω differential compatibility | Validated for use with industry-standard PCB trace impedances in both configurations. |
| Sub-25ps inter-channel delay matching | Ensures deterministic phase relationship between dual outputs for synchronous memory timing margins. |
| 3mm × 3mm TDFN footprint | Minimizes board area while maintaining thermal performance via exposed pad grounding. |
Applications
| QDR II SRAM Clock Distribution | Multiphase Clock Generation |
|---|---|
Use Scenario: Distributing synchronized 0°, 90°, 180°, and 270° clock phases to QDR II SRAM devices in networking switches and baseband processors. IC Role / Device Role / Timing Role: Passive delay element generating precise 90° phase shift for read/write strobe alignment. Use Value: Eliminates need for active PLL-based phase generators, reducing jitter accumulation and power overhead in memory subsystems. |
Use Scenario: Creating four-phase clock trees from a single master clock in FPGA-based test equipment and high-speed ADC/DAC timing controllers. IC Role / Device Role / Timing Role: Dual-path fixed-delay block providing matched 0.75ns offsets for interleaved sampling or pipeline staging. Use Value: Achieves <100ps skew between derived phases without calibration, improving time-interleaved converter ENOB. |
| High-Speed Memory Interface Buffering | Source-Terminated Signal Integrity Enhancement |
Use Scenario: Compensating for PCB trace length mismatches between controller and QDR II memory banks in telecom line cards. IC Role / Device Role / Timing Role: Fixed delay compensator inserted in clock path to equalize flight times across parallel memory channels. Use Value: Restores setup/hold timing margins degraded by layout asymmetry, enabling reliable >533MHz data rates. |
Use Scenario: Improving signal fidelity on long HSTL traces in backplane-connected memory modules where unterminated loads cause ringing. IC Role / Device Role / Timing Role: Passive impedance-matched delay line absorbing reflections while preserving edge rate and duty cycle. Use Value: Reduces overshoot and settling time by >30% compared to unterminated transmission lines, lowering bit error rates. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar passive delay line applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX3620BETT | 1.00ns nominal delay (vs. 0.75ns); otherwise identical electrical specs and pinout. | Used where 90° phase shift requires higher base clock frequency (e.g., 250MHz instead of 333MHz). | Select when system clock frequency constraints require longer delay to meet quadrature timing window. |
| ON Semiconductor NB7L14M | Active 1:4 fanout buffer with programmable delay (0–1.2ns), requires VCC = 2.5V, consumes ~120mW. | Provides adjustable delay and gain but adds power, noise, and supply dependency not present in MAX3620AETT. | Choose only if dynamic delay tuning or signal regeneration is required; MAX3620AETT preferred for zero-power, jitter-free phase shifting. |
Compared with MAX3620BETT and NB7L14M, the MAX3620AETT offers the shortest fixed delay (0.75ns) with lowest power (0W), highest delay matching precision (±20ps), and simplest integration-making it optimal for static, low-jitter QDR II clock phase generation where supply independence and PCB space are critical.
Availability
MAX3620AETT is available at Aetrix Electronics and suitable for QDR II memory subsystems, multiphase clock generators, and HSTL signal integrity enhancement requiring stable component supply, consistent parametric performance, and long-term industrial lifecycle support.
Supply support for MAX3620AETT 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 ICs for industrial, communications, and computing applications.
The MAX3620 series was designed specifically for passive, jitter-free clock phase generation in high-speed synchronous memory interfaces - targeting QDR/QDRII SRAM timing compliance without active circuitry or power supply dependencies.
FAQ
What is the exact nominal delay value specified for MAX3620AETT?
The MAX3620AETT is characterized for a nominal delay of 0.75ns per channel (IN1→OUT1 and IN2→OUT2) under matched 50Ω source and load conditions at +25°C. This value is guaranteed within a min/max range of 0.65ns to 0.85ns across temperature and process variation, as confirmed in Table 1 of the official datasheet.
Does MAX3620AETT require a power supply to operate?
No, the MAX3620AETT is a fully passive device constructed from distributed LC elements and requires no power supply, bias voltage, or external clock. It functions purely as a transmission-line delay element, making it immune to supply noise and eliminating quiescent current draw - a key advantage over active alternatives like the NB7L14M.
Can MAX3620AETT be used in differential signaling configurations?
Yes, the MAX3620AETT supports 100Ω differential transmission lines, as explicitly stated in its Features section. While its pinout is single-ended (IN1/IN2/OUT1/OUT2), the internal architecture allows differential pair routing - for example, routing IN1/IN2 as complementary inputs and OUT1/OUT2 as complementary outputs - provided common-mode voltage and layout symmetry are maintained.
What is the maximum recommended clock frequency for reliable operation of MAX3620AETT?
The MAX3620AETT is rated for reliable operation up to 333MHz, corresponding to its 450MHz -3dB cutoff frequency and 2.5dB typical insertion loss. This aligns with QDR II memory data rates of 533MT/s (266MHz clock doubled), ensuring sufficient bandwidth margin for clean edge preservation and minimal intersymbol interference.
How should the exposed pad (EP) on the MAX3620AETT TDFN package be handled in PCB layout?
The exposed pad (EP) on the MAX3620AETT must be connected to the COMMON net - the same potential as Pins 2 and 5 - using multiple thermal vias to an internal ground plane. Failure to do so degrades thermal performance and may compromise delay stability and return loss specifications, particularly above 200MHz.
MAX3620AETT 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:
- 850ps
- Number of Independent Delays:
- 2
- Voltage - Supply:
- -1.5V ~ 1.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 6-TDFN-EP (3x3)
MAX3620AETT FAQ
1.How can I place an order for MAX3620AETT through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX3620AETT 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 MAX3620AETT reliable?
The price and inventory of MAX3620AETT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX3620AETT is usually 5 days.
3.What payment methods are accepted for MAX3620AETT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX3620AETT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX3620AETT?
MAX3620AETT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX3620AETT 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 MAX3620AETT?
For technical support, including MAX3620AETT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX3620AETT requirements.
6.How does Aetrix verify that MAX3620AETT is sourced from the original manufacturer or authorized distributors?
All MAX3620AETT 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 MAX3620AETT meets industry standards.
7.What is the process for return or replacement of MAX3620AETT?
All MAX3620AETT units undergo pre-shipment inspection (PSI). If there is an issue with MAX3620AETT, 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 MAX3620AETT part is unused and in its original packaging.
Return procedure for MAX3620AETT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX3620AETT Tags
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DS1124U-25+T
Analog Devices Inc./Maxim Integrated
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