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Analog Devices Inc./Maxim Integrated DS1086LU-222+
- Part No.:
- DS1086LU-222+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
DS1086LU-222+.pdf
- Description:
- IC SS CLOCK GENERATOR 8UMAX
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
DS1086LU-222+ from Maxim Integrated is a 3.3V spread-spectrum EconOscillator™ that generates a dithered square-wave output from 130kHz to 66.6MHz, with selectable dither magnitudes of 0.5%, 1%, 2%, 4%, or 8%, adjustable dither rate (fOSC/8192 to fOSC/2048), nonvolatile EEPROM configuration storage, and industrial temperature operation (-40°C to +85°C). It serves as a programmable clock source for EMI reduction in PC peripherals and embedded systems.
For engineers reviewing the DS1086LU-222+ datasheet, DS1086LU-222+ pinout, DS1086LU-222+ application, or DS1086LU-222+ equivalent, key selection considerations include its 8-pin μSOP package, 2-wire serial interface for in-circuit programming, glitchless output-enable control, power-down mode (10μA standby current), and factory-default 48.65MHz master oscillator frequency with ±0.75% tolerance at +25°C.
Technical Context
The DS1086LU-222+ integrates a voltage-controlled master oscillator (33.3–66.6MHz) whose frequency is set via a 10-bit DAC (5kHz step size) and an OFFSET register selecting one of 13 overlapping 5.12MHz ranges. A triangle-wave generator injects unidirectional dither below the programmed frequency, with magnitude controlled by JS2–JS0 bits and rate by JS4–JS3 bits in the PRESCALER register.
Its 2-wire interface supports standard/fast mode (100/400kHz SCL), enables full register access (PRESCALER, DAC, OFFSET, ADDR), and stores settings permanently in NV EEPROM. The device operates stand-alone after programming-no external timing components required-and features synchronous OE/PDN controls to prevent output glitches during enable/disable transitions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Frequency Range | 130kHz to 66.6MHz - covers USB, PCIe reference, and processor clock domains without external dividers |
| Dither Magnitude Options | 0.5%, 1%, 2%, 4%, or 8% - enables compliance with CISPR 22/32 Class B radiated emission limits |
| Supply Voltage Range | 2.7V to 3.6V - compatible with 3.3V logic rails and tolerant of typical PCB voltage droop |
| Standby Current (Power-Down) | 10μA at TA = +25°C - supports battery-backed or ultra-low-power sleep states |
| Output Enable Propagation Delay | 200μs from PDN/OE assertion to stable oscillation - ensures deterministic wake-up timing |
| Frequency Step Resolution | 5kHz per DAC step - allows precise tuning to match legacy UART, audio codec, or display timing requirements |
| Operating Temperature Range | -40°C to +85°C - qualified for industrial and commercial-grade embedded applications |
Pinout & Package
DS1086LU-222+ is housed in an 8-pin μSOP package (118 mil width), thermally optimized for high-density PCB layouts and reflow-compatible with lead(Pb)-free processes.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OUT (Pin 1) | Oscillator Output | CMOS square-wave output; drives 15pF load with 45–55% duty cycle; no external buffer needed |
| SPRD (Pin 2) | Dither Enable Input | Active-high TTL/CMOS input; enables/disables spread-spectrum modulation without register access |
| VCC (Pin 3) | Power Supply | 3.3V nominal supply; requires 0.1μF + 0.01μF decoupling near pin for low-noise operation |
| GND (Pin 4) | Ground Reference | Signal and power ground return; must be low-impedance connection to minimize jitter |
| OE (Pin 5) | Output Enable | Glitchless CMOS control; places OUT in high-impedance state while master oscillator remains active |
| PDN (Pin 6) | Power-Down Control | Active-low input; disables master oscillator and reduces ICCQ to 10μA; requires ≥2× output cycles + 10μs hold time |
| SDA (Pin 7) | 2-Wire Serial Data | Open-drain I/O; supports multi-drop bus; pulled up externally; used for register read/write and EEPROM commit |
| SCL (Pin 8) | 2-Wire Serial Clock | Input-only clock line; synchronizes all register transfers; supports 100kHz/400kHz modes |
Key Features
| Feature | Design Value |
|---|---|
| User-programmable frequency generation | Full 130kHz–66.6MHz range set via 2-wire interface and retained in NV EEPROM-no host MCU boot-time initialization required |
| Selectable dither magnitude & rate | Five discrete dither percentages (0.5–8%) and three dither rates (fOSC/8192 to fOSC/2048) allow optimization for specific EMI notch depth and bandwidth |
| Glitchless output control | Synchronous OE and PDN logic eliminates runt pulses or metastability on clock edges-critical for FPGA and ASIC clock domain crossing |
| No external timing components | Self-contained oscillator core eliminates crystals, capacitors, or trimmers-reduces BOM count and layout sensitivity |
| Industrial temperature grade | Guaranteed operation from -40°C to +85°C with <±2.5% total frequency variation over temperature and voltage |
Applications
| Printers & Copiers | PC Peripherals |
|---|---|
Use Scenario: High-speed laser printer controller requiring low-EMI pixel clock for image data transfer and motor timing. IC Role / Device Role / Timing Role: Primary spread-spectrum clock generator for video interface and system bus, replacing fixed-frequency crystal oscillators. Use Value: Reduces peak radiated emissions by >10dB at fundamental and harmonic frequencies, enabling Class B certification without metal shielding. |
Use Scenario: USB 2.0 hub IC needing a clean, programmable 48MHz reference clock with minimal board space. IC Role / Device Role / Timing Role: Stand-alone clock source providing 48MHz ±50ppm with dither enabled to suppress narrowband noise in USB PHY layer. Use Value: Eliminates need for external crystal + PLL + spread-spectrum circuitry-reduces component count by 4–6 parts and saves >12mm² PCB area. |
| Cable Modems | Embedded Industrial Controllers |
Use Scenario: DOCSIS 3.0 cable modem upstream/downstream PHY requiring low-jitter, EMI-compliant reference clocks for QAM demodulation. IC Role / Device Role / Timing Role: Configurable master oscillator feeding multiple PLLs; dither rate tuned to avoid interference with adjacent channel RF bands. Use Value: Enables dynamic dither adjustment via microcontroller during field firmware updates-maintains FCC Part 15 compliance across operating modes. |
Use Scenario: Programmable logic controller (PLC) CPU module needing robust, field-reprogrammable clocking under variable thermal and voltage conditions. IC Role / Device Role / Timing Role: Nonvolatile-configured clock generator with factory-trimmed default frequency (48.65MHz) and EEPROM retention over 10,000 write cycles. Use Value: Supports remote frequency recalibration via service port-avoids hardware replacement when aging drift exceeds spec limits. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar spread-spectrum oscillator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Si5351A-B-GM | 3-output, I²C-programmable clock generator with fractional-N PLL; higher phase noise floor; requires external crystal | Supports multi-frequency synthesis (e.g., simultaneous 25MHz + 125MHz); not single-output spread-spectrum optimized | Choose Si5351A-B-GM when multiple synchronized clocks or sub-harmonic generation are required-not for EMI-focused single-clock replacement |
| ICS843002AGI-01LFT | Fixed 100MHz LVDS output; integrated spread-spectrum (±0.25%); no programmability; 3.3V only | Limited to one frequency; no dither rate/magnitude selection; no I²C interface or EEPROM | Choose ICS843002AGI-01LFT only for cost-sensitive, volume production where fixed 100MHz dithered clock suffices and flexibility is unnecessary |
Compared with Si5351A-B-GM and ICS843002AGI-01LFT, DS1086LU-222+ uniquely combines wide-range programmability, user-selectable dither parameters, and true stand-alone operation-making it optimal for EMI-constrained designs requiring field-adjustable timing without added complexity or external components.
Availability
DS1086LU-222+ is available at Aetrix Electronics and suitable for printers, cable modems, PC peripherals, and industrial controllers requiring stable component supply with guaranteed long-term manufacturability and RoHS-compliant packaging.
Supply support for DS1086LU-222+ 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 precision analog, mixed-signal, and power management ICs for industrial, communications, and computing markets.
The DS1086LU-222+ belongs to Maxim's EconOscillator™ family-designed specifically to replace fixed-frequency crystals and oscillators in EMI-sensitive digital systems through programmable spread-spectrum clock generation without external components.
FAQ
What is the factory-default output frequency of the DS1086LU-222+?
The DS1086LU-222+ ships with a factory-programmed default master oscillator frequency of 48.65MHz, corresponding to the OS (Offset Select) default value stored in the RANGE register. This frequency is trimmed to ±0.5% accuracy at +25°C and serves as the baseline for all OFFSET and DAC register calculations. The actual output frequency delivered to the OUT pin depends on the prescaler setting applied to this master frequency.
Can the DS1086LU-222+ operate without connecting the SDA and SCL pins?
Yes-the DS1086LU-222+ can operate in stand-alone mode with SDA and SCL tied high (via pull-ups), provided all required frequency, dither, and control settings are pre-programmed into its NV EEPROM during manufacturing or test. In this configuration, the device functions as a fixed-output spread-spectrum oscillator with no runtime I²C communication, reducing pin count and simplifying layout.
How does the DS1086LU-222+ achieve EMI reduction?
The DS1086LU-222+ reduces radiated emissions by applying unidirectional frequency dither-modulating the output downward by 0.5%, 1%, 2%, 4%, or 8% at a programmable rate (fOSC/8192 to fOSC/2048). This spreads energy across a wider bandwidth, lowering peak spectral amplitude by up to 15dB compared to a fixed-frequency source, directly addressing CISPR 22/32 conducted and radiated emission limits.
What is the minimum pulse width required on the PDN pin to enter power-down mode reliably?
To ensure reliable entry into power-down mode, the PDN pin must remain low for at least two full output frequency cycles plus 10μs-this deglitching interval prevents spurious exit due to noise. For example, at a 50MHz output, the minimum PDN low pulse width is ~40ns + 10μs ≈ 10.04μs. The device draws only 10μA in this state, and output resumes within 200μs after PDN returns high.
Does the DS1086LU-222+ require external decoupling capacitors?
Yes-the DS1086LU-222+ requires both a 0.1μF ceramic capacitor and a 0.01μF ceramic capacitor placed as close as possible to the VCC and GND pins. These capacitors stabilize the internal oscillator core, suppress supply-induced jitter, and maintain specified frequency accuracy and dither performance across temperature and load variations. Omission degrades EMI suppression and increases output jitter beyond datasheet limits.
DS1086LU-222+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- EconOscillator™
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Spread Spectrum Clock Generator
- PLL:
- No
- Input:
- Clock
- Output:
- Clock
- Number of Circuits:
- 1
- Ratio - Input:Output:
- 1:1
- Differential - Input:Output:
- No/No
- Frequency - Max:
- -
- Divider/Multiplier:
- Yes/No
- Voltage - Supply:
- 2.7V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 8-uMAX/uSOP
DS1086LU-222+ FAQ
1.How can I place an order for DS1086LU-222+ through Aetrix?
Please submit a Request for Quotation (RFQ) for DS1086LU-222+ 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 DS1086LU-222+ reliable?
The price and inventory of DS1086LU-222+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DS1086LU-222+ is usually 5 days.
3.What payment methods are accepted for DS1086LU-222+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS1086LU-222+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DS1086LU-222+?
DS1086LU-222+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DS1086LU-222+ 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 DS1086LU-222+?
For technical support, including DS1086LU-222+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS1086LU-222+ requirements.
6.How does Aetrix verify that DS1086LU-222+ is sourced from the original manufacturer or authorized distributors?
All DS1086LU-222+ 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 DS1086LU-222+ meets industry standards.
7.What is the process for return or replacement of DS1086LU-222+?
All DS1086LU-222+ units undergo pre-shipment inspection (PSI). If there is an issue with DS1086LU-222+, 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 DS1086LU-222+ part is unused and in its original packaging.
Return procedure for DS1086LU-222+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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