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Analog Devices Inc./Maxim Integrated DS1086LU-455+
- Part No.:
- DS1086LU-455+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
DS1086LU-455+.pdf
- Description:
- IC SS CLOCK GENERATOR 8UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:4,689
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Product details
Overview
DS1086LU-455+ 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 serves as a low-EMI timing source in PC peripherals and cable modems.
For engineers reviewing the DS1086LU-455+ datasheet, DS1086LU-455+ pinout, DS1086LU-455+ application, or DS1086LU-455+ equivalent, key selection criteria include spread-spectrum dither depth and rate configurability, industrial temperature operation (−40°C to +85°C), 2-wire serial programming interface, and μSOP-8 package compatibility with space-constrained embedded timing designs.
Technical Context
The DS1086LU-455+ integrates a voltage-controlled master oscillator (33.3–66.6MHz), a programmable triangle-wave generator for unidirectional frequency dithering, and a 9-bit DAC with 5kHz step resolution across user-selected OFFSET ranges. Its prescaler supports division by 2x (x = 0–8) before output routing.
Configuration is retained in nonvolatile EEPROM and accessed via a standard 2-wire interface compliant with I²C fast-mode (400kHz) and standard-mode (100kHz). Pin-level controls-SPRD (dither enable), OE (output buffer gate), and PDN (master oscillator disable)-enable real-time hardware modulation without software intervention.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Frequency Range | 130kHz to 66.6MHz - covers USB, PCIe reference, and legacy peripheral clocking requirements |
| Dither Depth Options | 0.5%, 1%, 2%, 4%, or 8% - enables EMI reduction tuning per regulatory test limits |
| Supply Voltage | 2.7V to 3.6V - compatible with 3.3V logic domains and tolerant of rail variation |
| Operating Temperature | −40°C to +85°C - qualified for industrial-grade embedded systems |
| Output Drive Strength | VOH ≥ 2.4V @ −4mA, VOL ≤ 0.4V @ 4mA - ensures robust CMOS-level signal integrity into 15pF load |
| Power-Down Current | 10μA max - enables ultra-low standby power in battery-backed or energy-sensitive applications |
| Dither Rate Range | fOSC/8192 to fOSC/2048 - allows spectral shaping to avoid narrowband interference peaks |
Pinout & Package
DS1086LU-455+ is housed in an 8-pin μSOP package (118 mils wide), optimized for high-density PCB layouts and reflow-compatible lead(Pb)-free assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 OUT | Oscillator Output | CMOS square-wave output; frequency determined by OFFSET, DAC, and prescaler registers |
| 2 SPRD | Dither Enable Input | Logic-high enables unidirectional frequency dithering; no software dependency for EMI on/off control |
| 3 VCC | Power Supply | 2.7V–3.6V supply input; requires local 0.1μF + 0.01μF decoupling per datasheet layout guidance |
| 4 GND | Ground Reference | Analog/digital common return; must be low-impedance connection to minimize jitter coupling |
| 5 OE | Output Enable | High enables output buffer; low places OUT in high-impedance state while master oscillator remains active |
| 6 PDN | Power-Down Control | Low disables master oscillator and output; requires ≥2 output cycles + 10μs persistence for deglitching |
| 7 SDA | 2-Wire Serial Data | Open-drain bidirectional I/O; supports wired-OR bus topology and standard/fast-mode I²C protocols |
| 8 SCL | 2-Wire Serial Clock | Input-only clock line; rising edge latches data into device, falling edge clocks data out |
Key Features
| Feature | Design Value |
|---|---|
| User-programmable frequency | Configurable via 2-wire interface with 5kHz DAC resolution and OFFSET register selection across 13 discrete frequency bands |
| Nonvolatile settings storage | All register values (PRESCALER, DAC, OFFSET, ADDR) persist in EEPROM; no external configuration required at power-up |
| Glitchless output enable | Synchronous OE gating prevents clock-domain metastability or transient spikes during enable/disable transitions |
| Adjustable dither rate | JS4/JS3 bits select dither modulation frequency (fOSC/8192 to fOSC/2048), enabling optimization for specific EMI test bandwidths |
| Industrial temperature range | Specified performance over −40°C to +85°C ambient, including frequency stability, supply current, and output duty cycle |
Applications
| Printers & Copiers | PC Peripherals |
|---|---|
Use Scenario: High-speed document scanning and laser print engine timing where radiated emissions must comply with CISPR 22 Class B limits. IC Role / Device Role / Timing Role: Primary spread-spectrum clock source for image processor, memory controller, and USB interface subsystems. Use Value: 0.5–8% dither depth reduces peak radiated emissions by up to 10dB, eliminating need for ferrite beads or shielding cans. |
Use Scenario: USB 2.0 hub controller and display interface timing in compact docking stations requiring low-profile packaging. IC Role / Device Role / Timing Role: Standalone programmable clock generator replacing crystal + PLL solutions with reduced BOM count. Use Value: μSOP-8 footprint and no external timing components simplify layout and reduce board area by >30% vs. discrete oscillator + divider designs. |
| Cable Modems | Industrial Embedded Controllers |
Use Scenario: DOCSIS-compliant upstream/downstream PHY timing where spectral purity and EMI margin are critical for FCC Part 15 certification. IC Role / Device Role / Timing Role: Dithered reference clock for QAM modulator/demodulator ASICs and Ethernet MAC controllers. Use Value: Factory-trimmed default frequency (48.65MHz) and ±0.75% initial tolerance ensure rapid system bring-up without field calibration. |
Use Scenario: Fan control, sensor interface, and CAN bus timing in DIN-rail mounted PLC modules operating in harsh thermal environments. IC Role / Device Role / Timing Role: Robust, reprogrammable clock source supporting firmware updates to adjust timing for new peripheral integration. Use Value: EEPROM-based configuration survives power cycling and enables remote frequency reprogramming via host microcontroller over 2-wire bus. |
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 PLL; no built-in spread-spectrum dither; requires external configuration | Multi-clock domain systems needing independent outputs; not drop-in for single-output dithered timing | Choose when multiple synchronized clocks are required and EMI reduction is handled externally or via system-level techniques |
| ICS8430-01GI | Fixed-frequency 50MHz spread-spectrum oscillator; 0.5% dither only; no programmability or EEPROM; SOIC-8 package | Cost-sensitive, high-volume applications with static clock requirements and no field reconfiguration need | Choose when design lock-in is complete and dither parameters are fixed; avoids EEPROM wear-out concerns in long-life deployments |
Compared with Si5351A-B-GM and ICS8430-01GI, DS1086LU-455+ uniquely combines single-output dither programmability, nonvolatile frequency storage, and μSOP-8 footprint-making it optimal for space-constrained, field-upgradable embedded systems requiring certified EMI reduction without multi-clock complexity or fixed-frequency inflexibility.
Availability
DS1086LU-455+ is available at Aetrix Electronics and suitable for printers, cable modems, and industrial embedded controllers requiring stable component supply, RoHS-compliant packaging, and guaranteed long-term availability.
Supply support for DS1086LU-455+ 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, mixed-signal, and timing ICs for industrial, communications, and computing applications.
The DS1086LU-455+ belongs to the EconOscillator™ family-engineered specifically to replace crystals and fixed oscillators in EMI-sensitive digital systems through integrated, user-configurable spread-spectrum clock generation.
FAQ
What is the factory-default output frequency of the DS1086LU-455+?
The DS1086LU-455+ ships with a factory-programmed default master oscillator frequency of 48.65MHz. This value is stored in the OFFSET and RANGE registers and serves as the baseline for all user-defined frequency calculations. The DS1086LU-455+ retains this setting in nonvolatile EEPROM and uses it at power-up unless reprogrammed via the 2-wire interface.
Does the DS1086LU-455+ require external passive components to operate?
No, the DS1086LU-455+ requires no external timing components such as crystals, capacitors, or resistors to generate its output clock. Only standard power-supply decoupling (0.1μF and 0.01μF ceramic capacitors near VCC/GND) is mandated per the datasheet. All frequency, dither, and control parameters are configured internally via EEPROM and register settings.
How does the dither function behave when the SPRD pin is held low?
When the SPRD pin is held low, the DS1086LU-455+ operates in undithered mode-the output frequency remains fixed at the programmed value with no frequency modulation. Dither is fully disabled at the hardware level, regardless of JS2–JS0 register settings. This allows deterministic timing behavior during debug, compliance testing, or low-jitter subsystem operation.
Can the DS1086LU-455+ be used without connecting the SDA and SCL pins?
Yes-the DS1086LU-455+ supports stand-alone operation. If in-circuit programming is never required (including during production testing), SDA and SCL may be tied directly to VCC. In this configuration, the DS1086LU-455+ runs exclusively with its factory-programmed or previously written EEPROM settings and ignores the 2-wire bus.
What is the maximum allowable load capacitance on the OUT pin of the DS1086LU-455+?
The DS1086LU-455+ specifies a load capacitance range of 15pF to 50pF on the OUT pin. Performance-including output duty cycle (45–55%), rise/fall times, and frequency stability-is guaranteed within this range. Exceeding 50pF may degrade edge rates and increase jitter; loads below 15pF are not characterized and may affect startup reliability or amplitude.
DS1086LU-455+ 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:
- Bulk
- 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-455+ FAQ
1.How can I place an order for DS1086LU-455+ through Aetrix?
Please submit a Request for Quotation (RFQ) for DS1086LU-455+ 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-455+ reliable?
The price and inventory of DS1086LU-455+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DS1086LU-455+ is usually 5 days.
3.What payment methods are accepted for DS1086LU-455+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS1086LU-455+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DS1086LU-455+?
DS1086LU-455+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DS1086LU-455+ 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-455+?
For technical support, including DS1086LU-455+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS1086LU-455+ requirements.
6.How does Aetrix verify that DS1086LU-455+ is sourced from the original manufacturer or authorized distributors?
All DS1086LU-455+ 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-455+ meets industry standards.
7.What is the process for return or replacement of DS1086LU-455+?
All DS1086LU-455+ units undergo pre-shipment inspection (PSI). If there is an issue with DS1086LU-455+, 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-455+ part is unused and in its original packaging.
Return procedure for DS1086LU-455+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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