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Analog Devices Inc./Maxim Integrated DS1087LU-255+
- Part No.:
- DS1087LU-255+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
DS1087LU-255+.pdf
- Description:
- IC CLOCK GENERATOR 8UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:2,714
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Product details
Overview
DS1087LU-255+ from Maxim Integrated is a factory-programmed 3.3V spread-spectrum clock generator producing a dithered square-wave output at 66.6MHz with 2% frequency deviation. It integrates a nonvolatile EEPROM for stand-alone operation, features 2-wire serial programming, and supports glitchless output-enable and hardware power-down control via dedicated pins. It is used in cable modems and PC peripherals to reduce EMI.
For engineers reviewing the DS1087LU-255+ datasheet, DS1087LU-255+ pinout, DS1087LU-255+ application, or DS1087LU-255+ equivalent, key selection considerations include its fixed 66.6MHz/2% dithered output, µSOP-8 package, 2.7V–3.6V supply range, and dual hardware control (OE/PDN) for low-power timing systems.
Technical Context
The DS1087LU-255+ uses a factory-trimmed master oscillator operating at 66.6MHz, with internal triangle-wave modulation enabling unidirectional 2% dither below nominal frequency. Its prescaler divides the master clock by powers of two (2⁰ to 2⁸), allowing user-adjustable output frequencies down to 130kHz - though DS1087LU-255+ is shipped preconfigured for 66.6MHz.
It implements synchronous output enable and power-down logic ensuring glitch-free transitions; power-down requires ≥2 output cycles + 10µs deglitching. The 2-wire interface supports both standard (100kHz) and fast mode (400kHz), with EEPROM write cycle time of 10ms and 10,000 write endurance at +70°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Frequency | 66.6MHz - factory-programmed master oscillator frequency; no external crystal required. |
| Dither Deviation | 2% - peak frequency reduction below 66.6MHz; reduces radiated EMI peaks without affecting duty cycle. |
| Supply Voltage | 2.7V to 3.6V - compatible with 3.3V logic systems; active current 15mA at 66.6MHz, 15pF load. |
| Power-Down Current | 5µA - enables ultra-low-power standby in battery-sensitive or intermittent-operation applications. |
| Output Enable Latency | 500µs - deterministic time from OE high to first valid output edge; ensures predictable timing recovery. |
| 2-Wire Interface | Standard/fast mode (100/400kHz) - supports I²C-compatible host controllers; SDA/SCL are open-drain with 5pF input capacitance. |
| Operating Temperature | -40°C to +85°C - qualified for industrial-grade embedded systems including printers and cable modems. |
Pinout & Package
DS1087LU-255+ is housed in an 8-pin µSOP package (118 mils wide), thermally optimized for surface-mount assembly on dense PCBs. Pin 1 is OUT; pin numbering follows standard top-view orientation with notch or dot marking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - OUT | Oscillator Output | CMOS square-wave output; 45–55% duty cycle; drives 15pF load with VOH ≥2.4V / VOL ≤0.4V. |
| 2 - SPRD | Dither Enable Input | Active-high control: high = 2% dither enabled; low = undithered output; no effect if J0 bit is set differently in register. |
| 3 - VCC | Power Supply | 2.7V–3.6V analog/digital supply; requires 0.01µF + 0.1µF ceramic decoupling adjacent to pin. |
| 4 - GND | Ground Reference | Common return for all internal circuitry; substrate tied to GND per chip topology. |
| 5 - OE | Output Enable | Active-high; enables/disables output buffer only - master oscillator remains running during OE low. |
| 6 - PDN | Power-Down Control | Active-low; disables master oscillator and halts all internal clocks; requires ≥2 output cycles + 10µs to exit cleanly. |
| 7 - SDA | 2-Wire Serial Data | Open-drain bidirectional I/O; supports read/write of PRESCALER/ADDR registers and EEPROM commit. |
| 8 - SCL | 2-Wire Serial Clock | Input-only clock line; synchronizes register access; tolerates 100kHz or 400kHz bus rates. |
Key Features
| Feature | Design Value |
|---|---|
| Factory-programmed 66.6MHz output | Eliminates need for external crystal or trimming components; reduces BOM count and layout complexity. |
| 2% spread-spectrum dither | Reduces peak radiated emissions by spreading energy across ~16kHz bandwidth (f₀/4096), easing EMC compliance. |
| Nonvolatile EEPROM storage | Persists user-modified prescaler, dither, and address settings across power cycles - enables true stand-alone operation. |
| Glitchless OE and PDN controls | Synchronous enable/disable logic prevents runt pulses or metastability; critical for clean clock domain entry/exit. |
| Hardware power-down mode | 5µA quiescent current allows integration into always-on systems with periodic wake-up requirements. |
Applications
| Printers | Cable Modems |
|---|---|
Use Scenario: High-speed page rendering and data buffering in inkjet/laser printers require stable, low-EMI system clocks. IC Role / Device Role / Timing Role: Primary system clock source for print controller ASIC and USB interface logic. Use Value: 66.6MHz dithered output meets FCC Class B radiated emission limits without added shielding or ferrites. | Use Scenario: DOCSIS-compliant cable modems demand precise, noise-immune clocking for QAM demodulation and MAC layer timing. IC Role / Device Role / Timing Role: Reference clock for downstream receiver PLL and upstream burst timing generator. Use Value: Factory-set 66.6MHz/2% dither eliminates post-manufacturing calibration while maintaining spectral mask compliance. |
| PC Peripherals | Industrial Copiers |
Use Scenario: USB 2.0 hubs, docking stations, and display adapters require robust, low-jitter clocks tolerant of shared PCB power rails. IC Role / Device Role / Timing Role: System clock generator for USB transceiver PHY and video timing controller. Use Value: 2.7V–3.6V supply range matches USB 3.3V rail; OE pin enables dynamic clock gating during suspend/resume. | Use Scenario: High-volume document copiers operate continuously in office environments with strict thermal and EMI constraints. IC Role / Device Role / Timing Role: Master clock for image sensor interface, laser scan motor controller, and network interface processor. Use Value: Power-down mode (5µA) reduces idle power in sleep state; µSOP-8 footprint minimizes board space in multi-layer designs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar spread-spectrum clock generator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ICS8430M-01LF | Fixed 66.6MHz output, 0.5% dither; LVDS output; requires 3.3V supply; no 2-wire interface. | Limited to point-to-point LVDS clock distribution; lacks programmable OE/PDN and EEPROM. | Select when differential signaling and minimal jitter (<1ps RMS) are prioritized over flexibility and EMI reduction. |
| Si5351A-B-GM | Programmable 8kHz–200MHz outputs; I²C-configurable; 3.3V supply; integrated PLL; no factory preset. | Requires full firmware initialization; higher BOM cost; suited for multi-frequency systems needing runtime reconfiguration. | Select when multiple independent clock domains or dynamic frequency scaling are required - not for fixed-output, drop-in replacement. |
Compared with ICS8430M-01LF and Si5351A-B-GM, DS1087LU-255+ uniquely combines factory-programmed simplicity, hardware-controlled power management, and proven 2% spread-spectrum EMI suppression in a compact µSOP-8 package - ideal for cost-sensitive, volume OEM applications where configuration stability matters more than runtime flexibility.
Availability
DS1087LU-255+ is available at Aetrix Electronics and suitable for cable modems, industrial copiers, and PC peripheral designs requiring stable component supply, long-term lifecycle support, and guaranteed EMI performance out-of-box.
Supply support for DS1087LU-255+ 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 precision analog, mixed-signal, and power management ICs for industrial, communications, and computing markets.
The DS1087L EconOscillator product line was designed to deliver certified spread-spectrum clocking in compact, self-contained packages - targeting EMI-constrained consumer and industrial electronics where crystal oscillators and discrete spread-spectrum solutions add cost and complexity.
FAQ
What is the factory-programmed output frequency and dither percentage for DS1087LU-255+
The DS1087LU-255+ is factory-programmed to deliver a 66.6MHz square-wave output with 2% spread-spectrum dither. This configuration is permanently stored in nonvolatile EEPROM and requires no external components to operate. The dither is unidirectional (always lower than nominal) and implemented via triangle-wave injection into the master oscillator.
Can DS1087LU-255+ be reprogrammed after soldering, and what interface is used?
Yes, DS1087LU-255+ supports in-circuit reprogramming via its 2-wire (I²C-compatible) serial interface using SDA and SCL pins. Users can modify the prescaler, dither selection (J0 bit), and slave address through the PRESCALER and ADDR registers. EEPROM writes require explicit command issuance or automatic commit depending on the WC bit setting.
How does the power-down mode of DS1087LU-255+ differ from output disable via OE?
OE (pin 5) disables only the output buffer while keeping the master oscillator running; DS1087LU-255+ consumes ~15mA in this state. PDN (pin 6) disables the entire master oscillator, reducing supply current to 5µA. Exiting PDN requires ≥2 output cycles + 10µs deglitching before stable output resumes - a deterministic delay critical for synchronized wake-up sequences.
What is the significance of the SPRD pin on DS1087LU-255+, and how does it interact with register settings?
The SPRD pin (pin 2) is a hardware dither enable input: high = dither active, low = dither disabled. Its function overrides the J0 bit in the PRESCALER register - meaning if SPRD is low, dither is off regardless of J0 value. This allows system-level EMI control independent of register configuration, supporting dynamic emission management during different operational modes.
Is DS1087LU-255+ pin-compatible with other DS1087L variants such as DS1087LU-466+?
Yes, DS1087LU-255+ shares identical µSOP-8 pinout, electrical characteristics, and functional pin mapping with all DS1087LU-x variants, including DS1087LU-466+. The only differences are factory-programmed parameters: DS1087LU-255+ delivers 66.6MHz at 2% dither, while DS1087LU-466+ delivers 66.6MHz at 4% dither. Both support identical OE, PDN, SPRD, and 2-wire control functionality.
DS1087LU-255+ 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:
- Clock Generator
- PLL:
- No
- Input:
- Clock
- Output:
- Clock
- Number of Circuits:
- 1
- Ratio - Input:Output:
- 2:1
- Differential - Input:Output:
- No/No
- Frequency - Max:
- 55MHz
- 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
DS1087LU-255+ FAQ
1.How can I place an order for DS1087LU-255+ through Aetrix?
Please submit a Request for Quotation (RFQ) for DS1087LU-255+ 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 DS1087LU-255+ reliable?
The price and inventory of DS1087LU-255+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DS1087LU-255+ is usually 5 days.
3.What payment methods are accepted for DS1087LU-255+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS1087LU-255+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DS1087LU-255+?
DS1087LU-255+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DS1087LU-255+ 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 DS1087LU-255+?
For technical support, including DS1087LU-255+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS1087LU-255+ requirements.
6.How does Aetrix verify that DS1087LU-255+ is sourced from the original manufacturer or authorized distributors?
All DS1087LU-255+ 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 DS1087LU-255+ meets industry standards.
7.What is the process for return or replacement of DS1087LU-255+?
All DS1087LU-255+ units undergo pre-shipment inspection (PSI). If there is an issue with DS1087LU-255+, 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 DS1087LU-255+ part is unused and in its original packaging.
Return procedure for DS1087LU-255+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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