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Analog Devices Inc./Maxim Integrated MAX3620DETT
- Part No.:
- MAX3620DETT
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Delay Lines
- Package:
- 6-WDFN Exposed Pad
- Datasheet:
-
MAX3620DETT.pdf
- Description:
- DELAY LINES - CLOCK DISTRIBUTION
- Quantity:
- Payment:
- Shipping:
Inventory:3,865
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Product details
Overview
MAX3620DETT 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 1.50ns nominal delay per channel, supports 50Ω single-ended and 100Ω differential transmission lines, features ±20ps delay matching between channels, and operates across -40°C to +85°C in a 3mm × 3mm TDFN package.
For engineers reviewing the MAX3620DETT datasheet, MAX3620DETT pinout, MAX3620DETT application, or MAX3620DETT equivalent, key selection criteria include verified 1.50ns delay accuracy at 125–167MHz clock frequencies, insertion loss ≤3.4dB, 300MHz cutoff frequency, and compatibility with HSTL source-terminated signaling without load termination.
Technical Context
The MAX3620DETT implements a distributed LC transmission-line architecture with symmetrical 50Ω characteristic impedance per channel, enabling matched propagation paths for IN1→OUT1 and IN2→OUT2. Its all-passive design eliminates active components, ensuring zero power consumption and no DC bias dependency.
It operates exclusively with source termination (no load termination required), supports both single-ended (IN1/IN2/OUT1/OUT2) and differential drive modes via shared COMMON pins, and maintains stable delay performance across load capacitances up to 5pF and load resistances ≥20kΩ.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Delay | 1.50ns per channel - enables accurate 90° phase shift at 167MHz for QDRII clock distribution |
| Delay Matching | ±20ps - ensures sub-cycle timing alignment between dual output paths |
| Characteristic Impedance | 50Ω - matches standard PCB trace impedance for minimal reflections in HSTL systems |
| Insertion Loss | 3.4dB - preserves signal integrity with <1.5× amplitude reduction at operating frequencies |
| Cutoff Frequency | 300MHz - supports reliable operation up to 167MHz clock rate with >3dB margin |
| Input/Output Return Loss | ≥12dB / ≥15dB (50–1000MHz) - indicates robust impedance matching across high-speed bandwidth |
| Operating Temperature | -40°C to +85°C - qualified for industrial-grade embedded memory subsystems |
Pinout & Package
MAX3620DETT is housed in a 6-pin Thin Dual Flat No-lead (TDFN) package measuring 3mm × 3mm × 0.80mm with exposed pad (T633-2). The exposed pad must be connected to COMMON potential for thermal and electrical stability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (IN1) | Single-ended input channel 1 | Accepts HSTL-level clock signal; unused in differential mode |
| 2 (COMMON) | Reference ground/common return | Shared reference for both channels; connects to exposed pad |
| 3 (IN2) | Single-ended input channel 2 | Enables independent or complementary drive of second delay path |
| 4 (OUT2) | Single-ended output channel 2 | Delivers 1.50ns-delayed replica of IN2; matches OUT1 delay within ±20ps |
| 5 (COMMON) | Reference ground/common return | Duplicate COMMON terminal for layout symmetry and low-inductance return path |
| 6 (OUT1) | Single-ended output channel 1 | Delivers 1.50ns-delayed replica of IN1; primary output for quarter-phase clock generation |
Key Features
| Feature | Design Value |
|---|---|
| All-passive LC architecture | Zero power consumption, no DC biasing, immunity to supply noise and temperature drift |
| HSTL source-termination support | Operates with 50Ω series source termination only - eliminates need for parallel load termination |
| Dual independent delay paths | Two matched 1.50ns channels enable simultaneous 0°/90° or 180°/270° clock phasing |
| 50Ω/100Ω transmission line compatibility | Validated for both 50Ω single-ended and 100Ω differential routing without re-tuning |
| Small 3mm × 3mm footprint | Minimizes PCB area in space-constrained memory interface layouts near QDR/QDRII SRAM |
Applications
| QDR/QDRII Memory Clock Distribution | Multiphase Clock Generation |
|---|---|
|
Use Scenario: Generating precise 90°-shifted clocks for double-data-rate read/write strobes in QDRII SRAM interfaces. IC Role / Device Role / Timing Role: Passive delay element providing fixed 1.50ns propagation to derive quarter-cycle phase offset from main system clock. Use Value: Enables setup/hold compliance for high-speed QDRII data capture without active PLLs or programmable delays. |
Use Scenario: Creating four-phase (0°, 90°, 180°, 270°) clock trees for multi-lane serializer/deserializer clocking. IC Role / Device Role / Timing Role: Dual-path delay block delivering two synchronized 1.50ns-delayed outputs referenced to common inputs. Use Value: Achieves sub-100ps inter-channel skew between phase outputs, critical for deterministic sampling windows. |
| High-Speed Source-Terminated Bus Timing | Low-Jitter Clock Replication |
|
Use Scenario: Compensating for trace-length mismatch in HSTL-class backplane or module interconnects. IC Role / Device Role / Timing Role: Fixed delay compensator inserted in clock path to equalize flight time across parallel signal lanes. Use Value: Eliminates need for length-matched PCB routing; maintains <±20ps skew across temperature and voltage. |
Use Scenario: Distributing a clean, low-additive-jitter clock to multiple memory controller clock inputs. IC Role / Device Role / Timing Role: Passive repeater preserving edge fidelity while adding deterministic 1.50ns latency. Use Value: Adds no active noise or duty-cycle distortion - measured insertion loss ≤3.4dB and return loss ≥12dB. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar passive delay line applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX3620CETT | 1.25ns nominal delay (vs. 1.50ns); 320MHz cutoff; 3.1dB insertion loss | Better suited for 200MHz+ QDRII systems requiring tighter delay resolution | Select when 1.25ns phase shift aligns with target clock frequency and lower loss is prioritized |
| MAX3620BETT | 1.00ns nominal delay; 370MHz cutoff; 2.1dB insertion loss; higher bandwidth | Optimized for 250MHz clock domains where shorter delay and lower loss reduce jitter accumulation | Choose for higher-frequency designs needing faster edge preservation and reduced amplitude degradation |
Compared with MAX3620CETT and MAX3620BETT, the MAX3620DETT provides the longest standardized delay (1.50ns) in the family, making it uniquely suitable for 125–167MHz QDRII clocking where quarter-cycle alignment requires ~1.5ns at 167MHz - a value not achievable with the shorter-delay variants.
Availability
MAX3620DETT is available at Aetrix Electronics and suitable for QDR/QDRII memory subsystems, multiphase clock generation circuits, and HSTL source-terminated timing distribution networks requiring stable component supply and guaranteed long-term availability.
Supply support for MAX3620DETT 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 and mixed-signal ICs for industrial, communications, and computing applications, with emphasis on signal integrity, power efficiency, and reliability.
The MAX3620 series was developed specifically for high-speed memory interface timing - delivering factory-trimmed, passive delay accuracy in compact packages to replace discrete LC networks in QDR/QDRII clock trees.
FAQ
What is the exact nominal delay value specified for MAX3620DETT?
The MAX3620DETT is factory characterized for a nominal delay of 1.50ns per channel, with a guaranteed range of 1.40ns to 1.60ns under matched 50Ω source/load conditions. This value is confirmed in Table 1 of the official datasheet and is traceable to Maxim's production test specifications for the D-grade variant.
Does MAX3620DETT require external termination resistors?
No, the MAX3620DETT is designed for source termination only - a 50Ω resistor placed in series with the driver output suffices. Load termination is not required, and the device specifies optimal performance with unterminated (high-impedance) receivers, simplifying board layout and reducing component count in HSTL systems.
Can MAX3620DETT be used in differential signaling configurations?
Yes, the MAX3620DETT supports differential operation: connect IN1 and IN2 to complementary signals, and use OUT1 and OUT2 as the delayed differential pair. Its symmetrical 50Ω impedance and matched delay paths ensure consistent phase relationship and skew control in true differential clock distribution.
What is the maximum recommended clock frequency for reliable operation of MAX3620DETT?
The MAX3620DETT is rated for reliable operation up to 167MHz, as defined in Table 1 of its datasheet under "Clock Frequency" for the D-grade variant. This limit is derived from its 300MHz -3dB cutoff and validated insertion loss performance, ensuring adequate signal integrity at the fundamental clock rate.
How does the exposed pad on the MAX3620DETT package function electrically?
The exposed pad on the MAX3620DETT must be connected to the COMMON potential - it serves as both a low-inductance ground return path and a thermal conduction surface. Leaving it unconnected or floating degrades return loss, increases thermal resistance, and risks violating absolute maximum ratings for voltage between COMMON and IO pins.
MAX3620DETT 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:
- 1.6ns
- 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)
MAX3620DETT FAQ
1.How can I place an order for MAX3620DETT through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX3620DETT 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 MAX3620DETT reliable?
The price and inventory of MAX3620DETT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX3620DETT is usually 5 days.
3.What payment methods are accepted for MAX3620DETT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX3620DETT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX3620DETT?
MAX3620DETT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX3620DETT 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 MAX3620DETT?
For technical support, including MAX3620DETT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX3620DETT requirements.
6.How does Aetrix verify that MAX3620DETT is sourced from the original manufacturer or authorized distributors?
All MAX3620DETT 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 MAX3620DETT meets industry standards.
7.What is the process for return or replacement of MAX3620DETT?
All MAX3620DETT units undergo pre-shipment inspection (PSI). If there is an issue with MAX3620DETT, 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 MAX3620DETT part is unused and in its original packaging.
Return procedure for MAX3620DETT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX3620DETT Tags
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LTC6994CS6-1#TRMPBF
Analog Devices Inc.
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LTC6994CDCB-1#TRMPBF
Analog Devices Inc.
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LTC6994IS6-1#TRMPBF
Analog Devices Inc.
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LTC6994IS6-1#TRPBF
Analog Devices Inc.
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LTC6994IDCB-1#TRMPBF
Analog Devices Inc.
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LTC6994IS6-2#TRMPBF
Analog Devices Inc.
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LTC6994HS6-1#TRPBF
Analog Devices Inc.
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LTC6994HS6-1#TRMPBF
Analog Devices Inc.
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LTC6994HS6-2#TRMPBF
Analog Devices Inc.
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LTC6994HDCB-2#TRMPBF
Analog Devices Inc.
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Analog Devices Inc.
-
DS1124U-25+T
Analog Devices Inc./Maxim Integrated
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