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Analog Devices Inc./Maxim Integrated DS1086LU+C66
- Part No.:
- DS1086LU+C66
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
DS1086LU+C66.pdf
- Description:
- IC SS CLOCK GENERATOR 8UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:2,592
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Product details
Overview
DS1086LU+C66 from Maxim Integrated is a 3.3V spread-spectrum programmable clock oscillator with nonvolatile EEPROM configuration, generating dithered square-wave outputs from 130kHz to 66.6MHz. It features selectable dither depth (0.5%–8%), adjustable dither rate (fOSC/8192 to fOSC/2048), glitchless output-enable control, and power-down mode. It operates in industrial temperature range (−40°C to +85°C) and is used in printers, cable modems, and PC peripherals for EMI reduction.
For engineers reviewing the DS1086LU+C66 datasheet, DS1086LU+C66 pinout, DS1086LU+C66 application, or DS1086LU+C66 equivalent, key selection considerations include its spread-spectrum dithering capability, 2-wire serial programmability, 5kHz DAC step resolution, μSOP-8 package compatibility, and standalone operation without external timing components.
Technical Context
The DS1086LU+C66 integrates a voltage-controlled master oscillator (33.3–66.6MHz), a programmable triangle-wave dither generator, and a binary prescaler (÷1 to ÷256) to produce spectrally shaped outputs. Its frequency is set via OFFSET (selects 13 MHz-wide frequency bands) and DAC (5kHz steps within band) registers stored in NV EEPROM.
Dither magnitude (0.5%, 1%, 2%, 4%, or 8%) is controlled by JS2–JS0 bits; dither rate (fOSC/8192, /4096, or /2048) by JS4–JS3 bits; and output enable (OE), power-down (PDN), and dither enable (SPRD) are hardware-controlled asynchronous inputs. All register writes use standard-mode or fast-mode 2-wire interface (100 kHz / 400 kHz SCL).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Frequency Range | 130kHz to 66.6MHz - covers USB, PCIe reference, Ethernet PHY, and legacy peripheral clocks without external dividers. |
| Spread-Spectrum Dither Depth | 0.5%, 1%, 2%, 4%, or 8% - unidirectional downward dither reduces peak radiated emissions by spreading energy across bandwidth. |
| Supply Voltage | 2.7V to 3.6V - compatible with 3.3V logic rails and tolerant of typical PCB voltage droop. |
| Operating Temperature | −40°C to +85°C - qualified for industrial and commercial embedded systems with no derating required. |
| Power-Down Current | 10μA max at +85°C - enables low-power sleep states in battery-backed or always-on peripherals. |
| DAC Resolution | 5kHz step size - allows precise frequency tuning (e.g., 11.0592MHz UART clock) with <0.004% error in typical configurations. |
| Interface | 2-wire serial (I²C-compatible) - supports in-system programming during production test or field updates without rework. |
Pinout & Package
DS1086LU+C66 is housed in an 8-pin μSOP package (118 mil width), RoHS-compliant and lead(Pb)-free. The package supports standard reflow profiles and provides thermal performance suitable for high-density PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: OUT | Oscillator Output | CMOS square-wave output; drives 15pF load with 45–55% duty cycle; glitchless enable/disable via OE. |
| 2: SPRD | Dither Enable Input | Active-high TTL/CMOS input; enables/disables spread-spectrum modulation without affecting frequency programming. |
| 3: VCC | Power Supply | 3.3V nominal supply; requires 0.1μF + 0.01μF decoupling close to pin for stable oscillation and low noise. |
| 4: GND | Ground Reference | Common return path for oscillator core, I/O, and internal regulators; must be low-impedance plane. |
| 5: OE | Output Enable | Active-high control; places OUT in high-impedance state while master oscillator remains active - ideal for clock gating. |
| 6: PDN | Power-Down Control | Active-low input; disables master oscillator and forces OUT to Hi-Z or low (configurable via Lo/HiZ bit) - cuts ICCQ to ≤10μA. |
| 7: SDA | 2-Wire Serial Data | Open-drain bidirectional line; requires external pull-up; supports standard/fast-mode I²C read/write to EEPROM registers. |
| 8: SCL | 2-Wire Serial Clock | Input-only clock line; synchronizes register access; tolerates 100 kHz (standard) or 400 kHz (fast) operation. |
Key Features
| Feature | Design Value |
|---|---|
| User-programmable frequency | Configurable from 130kHz to 66.6MHz in 5kHz increments via OFFSET/DAC registers - eliminates need for multiple crystal SKUs. |
| Nonvolatile settings storage | All configuration registers retained in on-chip EEPROM - device powers up with last programmed frequency and dither settings. |
| Glitchless output control | OE and PDN inputs synchronize to internal clock domain - prevents runt pulses or metastability on OUT during enable/disable transitions. |
| EMI reduction architecture | Programmable dither depth and rate allow optimization for specific regulatory limits (e.g., FCC Class B) without board-level redesign. |
| No external timing components | Self-contained oscillator core - no external crystal, capacitor, or resistor required - reduces BOM count and layout area. |
Applications
| Printers & Copiers | PC Peripherals |
|---|---|
Use Scenario: High-speed laser printer controller requiring stable pixel clock and reduced EMI to pass CISPR 22 Class B emissions testing. IC Role / Device Role / Timing Role: Primary spread-spectrum clock source for image processing ASIC and motor control MCU. Use Value: 4% dither at 48MHz reduces 24MHz harmonic peaks by >10dB, eliminating need for ferrite beads or shielded enclosures. |
Use Scenario: USB 2.0 hub IC requiring precise 48MHz reference with low jitter and minimal conducted noise on shared 3.3V rail. IC Role / Device Role / Timing Role: Standalone clock generator replacing crystal + buffer; configured via 2-wire during manufacturing test. Use Value: Factory-programmed 48.000MHz output with 1% dither achieves <±50ppm stability over temperature and voltage, meeting USB spec. |
| Cable Modems | Industrial PCs |
Use Scenario: DOCSIS 3.0 cable modem with multi-core SoC needing low-emission 100MHz reference for SerDes lanes. IC Role / Device Role / Timing Role: Spread-spectrum clock for PCIe Gen2 interface; synchronized to upstream QAM carrier timing. Use Value: Configurable dither rate (fOSC/4096) aligns spectral spreading with channel bandwidth, avoiding interference with adjacent RF channels. |
Use Scenario: Fanless industrial PC motherboard where thermal constraints prevent use of active cooling near clock circuitry. IC Role / Device Role / Timing Role: Low-power 33.333MHz clock for real-time OS timer and display controller, operating in −40°C to +85°C ambient. Use Value: 10μA power-down current and μSOP-8 footprint enable placement near heat-sensitive components without thermal derating. |
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 PLL-based architecture; higher phase noise; requires external crystal. | Supports multi-frequency synthesis (e.g., simultaneous 25MHz + 125MHz); not single-output spread-spectrum optimized. | Choose Si5351A-B-GM when multiple independent clocks or fractional-N synthesis are required; DS1086LU+C66 is preferred for single-output EMI reduction with zero external components. |
| ICS843002AGI-01LFT | Fixed-frequency 50MHz spread-spectrum oscillator (±0.25% dither); no programmability; LVDS output; 3.3V only. | Limited to factory-set frequency; no in-field reconfiguration; requires level-shifting for CMOS loads. | Choose ICS843002AGI-01LFT for cost-sensitive, high-volume applications where frequency and dither are invariant; DS1086LU+C66 offers design flexibility and field update capability. |
Compared with Si5351A-B-GM and ICS843002AGI-01LFT, DS1086LU+C66 uniquely combines single-output spread-spectrum operation, full 130kHz–66.6MHz programmability, nonvolatile storage, and zero external component requirement - making it optimal for EMI-constrained, space-limited, and configuration-flexible designs.
Availability
DS1086LU+C66 is available at Aetrix Electronics and suitable for printers, cable modems, and industrial PCs requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for DS1086LU+C66 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 DS1086L EconOscillator product line was designed to replace fixed-frequency crystals in EMI-sensitive digital systems, delivering programmable spread-spectrum timing with minimal design overhead and no external components.
FAQ
What is the factory-default output frequency of the DS1086LU+C66?
The DS1086LU+C66 ships with a factory-programmed default master oscillator frequency of 48.65MHz. This value is trimmed per unit and stored in the RANGE register. When used in stand-alone mode (SDA/SCL tied high), the device outputs this frequency with 1% dither enabled if SPRD is asserted, and the prescaler set to ÷1 unless modified by external configuration.
Can the DS1086LU+C66 operate without connecting SDA and SCL pins?
Yes, the DS1086LU+C66 can operate in stand-alone mode with SDA and SCL permanently tied to VCC. In this configuration, it uses the factory-programmed EEPROM values for OFFSET, DAC, and PRESCALER registers. No in-circuit programming is possible, but the device retains full functionality including dither control via SPRD, output enable via OE, and power-down via PDN.
What is the maximum load capacitance supported on the OUT pin of the DS1086LU+C66?
The DS1086LU+C66 specifies a maximum load capacitance of 50pF on the OUT pin. For reliable operation at frequencies above 25MHz, a 15pF load is recommended. Exceeding 50pF may degrade rise/fall times, increase jitter, or cause duty cycle distortion - especially at 66.6MHz output with full 8% dither.
How does the DS1086LU+C66 achieve EMI reduction without compromising timing accuracy?
The DS1086LU+C66 achieves EMI reduction through unidirectional frequency dithering - shifting the output frequency downward by 0.5% to 8% in a controlled triangle waveform. This spreads spectral energy across a narrow band while maintaining tight average frequency accuracy (±0.75% over temperature/voltage). The dither is fully programmable and does not affect long-term stability or ppm drift.
Is the DS1086LU+C66 pin-compatible with other members of the DS1086L family?
Yes, the DS1086LU+C66 shares identical pinout, package (μSOP-8), and electrical interface with all DS1086L variants including DS1086LU and DS1086LU+. Differences are limited to marking, RoHS compliance status (+ suffix), and minor internal calibration - all functional registers, timing, and control behavior remain consistent across the family.
DS1086LU+C66 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:
- Obsolete
- 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+C66 FAQ
1.How can I place an order for DS1086LU+C66 through Aetrix?
Please submit a Request for Quotation (RFQ) for DS1086LU+C66 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+C66 reliable?
The price and inventory of DS1086LU+C66 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DS1086LU+C66 is usually 5 days.
3.What payment methods are accepted for DS1086LU+C66?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS1086LU+C66 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DS1086LU+C66?
DS1086LU+C66 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DS1086LU+C66 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+C66?
For technical support, including DS1086LU+C66 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS1086LU+C66 requirements.
6.How does Aetrix verify that DS1086LU+C66 is sourced from the original manufacturer or authorized distributors?
All DS1086LU+C66 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+C66 meets industry standards.
7.What is the process for return or replacement of DS1086LU+C66?
All DS1086LU+C66 units undergo pre-shipment inspection (PSI). If there is an issue with DS1086LU+C66, 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+C66 part is unused and in its original packaging.
Return procedure for DS1086LU+C66:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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