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Analog Devices Inc./Maxim Integrated DS1089LU-450+
- Part No.:
- DS1089LU-450+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
DS1089LU-450+.pdf
- Description:
- IC CLOCK GENERATOR 8UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:2,735
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Product details
Overview
DS1089LU-450+ from Maxim Integrated is a factory-programmed 50.0MHz spread-spectrum clock generator with ±2% dither, I²C programmability, and 8-pin µSOP packaging. It delivers EMI-reduced square-wave output from 130kHz to 66.6MHz via internal prescaler, operates from 2.7V–3.6V, and features nonvolatile EEPROM storage for standalone operation in printers, POS terminals, and cable modems.
For engineers reviewing the DS1089LU-450+ datasheet, DS1089LU-450+ pinout, DS1089LU-450+ application, or DS1089LU-450+ equivalent, key selection criteria include dither percentage (±2%), dither frequency (fMOSC/4096 = 12.207kHz), output enable/power-down control, I²C address configuration, and 8-pin µSOP thermal and layout constraints.
Technical Context
The DS1089LU-450+ integrates a factory-trimmed 50.0MHz master oscillator with bidirectional triangle-wave modulation for center-spread dithering. Its I²C interface (400kHz fast-mode) allows runtime reconfiguration of prescaler (÷1 to ÷256), dither amplitude (±1%/±2%/±4%/±8%), and dither rate (fMOSC/2048/4096/8192).
Hardware control pins-SPRD (dither enable), OE (output enable), and PDN (power-down)-operate synchronously to prevent glitches, with power-down current limited to 10µA and output stabilization requiring 512 master clock cycles (10.24µs at 50MHz). The device retains settings in NV EEPROM and supports stand-alone mode with SDA/SCL pulled high.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Frequency | Factory-set 50.0MHz center frequency; user-adjustable down to 130kHz via prescaler |
| Dither Amplitude | ±2% symmetric deviation around 50.0MHz center, reducing peak EMI without shifting average frequency |
| Dither Frequency | fMOSC/4096 = 12.207kHz modulation rate, optimized for spectral spreading at fundamental clock harmonics |
| Supply Voltage | 2.7V–3.6V operation; ensures compatibility with 3.3V logic systems and robust noise margin |
| Active Supply Current | 12mA typical at 50MHz output, enabling low-power peripheral timing without external regulators |
| Power-Down Current | 10µA max, supporting battery-backed or intermittent-operation systems |
| I²C Interface | 400kHz fast-mode compatible; allows dynamic reconfiguration without system reset or firmware update |
Pinout & Package
DS1089LU-450+ uses an 8-pin µSOP (118 mil) package with exposed pad for thermal dissipation. Pin pitch is 0.5mm, body dimensions are 3.0mm × 3.0mm × 1.0mm, and recommended PCB land pattern follows JEDEC MO-187AA.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 OUT | Oscillator Output | CMOS-compatible square-wave output; 50.0MHz ±2% dithered signal with 50% duty cycle (±2%) |
| 2 SPRD | Dither Enable | Active-high hardware control: high = dither enabled; low = undithered 50.0MHz output |
| 3 VCC | Power Supply | 2.7V–3.6V supply input; requires 0.01µF + 0.1µF ceramic decoupling adjacent to pin |
| 4 GND | Ground Reference | Primary return path for oscillator core, I²C interface, and output buffer; tied to substrate |
| 5 OE | Output Enable | Hardware gate for OUT: high = output active; low = high-Z (buffer disabled but oscillator running) |
| 6 PDN | Power-Down | Master oscillator disable: high = active; low = full shutdown (10µA ICCQ, 7µs disable latency) |
| 7 SDA | I²C Data Line | Open-drain bidirectional serial data; requires 4.7kΩ pull-up to VCC for proper I²C signaling |
| 8 SCL | I²C Clock Line | Input-only clock line; synchronizes register reads/writes at up to 400kHz |
Key Features
| Feature | Design Value |
|---|---|
| Center-spread dither architecture | Maintains exact 50.0MHz average frequency while spreading energy across ±2% bandwidth to meet FCC Class B radiated emissions limits |
| Nonvolatile EEPROM storage | Retains prescaler, dither %, dither rate, and I²C address across power cycles-no boot-time reprogramming required |
| Synchronous output gating | OE and PDN transitions align to master clock edge, eliminating runt pulses or metastability during enable/disable |
| Glitchless power-down recovery | 512-cycle stabilization time ensures clean 50.0MHz output resumption after PDN deassertion-no frequency overshoot or phase discontinuity |
| Hardware/software dual-control | OE pin OR'ed with ADDR register bit enables flexible control: hardware override or firmware-managed output enable |
Applications
| Printers | POS Terminals |
|---|---|
Use Scenario: High-speed laser printer controller requiring stable 50MHz pixel clock with reduced EMI to pass CISPR 22 Class B certification. IC Role / Device Role / Timing Role: Primary clock source generating dithered 50.0MHz reference for image processing ASIC and motor control FPGA. Use Value: ±2% dither spreads spectral energy, lowering 50MHz harmonic peaks by >10dB and eliminating costly metal shielding. | Use Scenario: Compact retail POS terminal with space-constrained PCB and no dedicated clock management IC. IC Role / Device Role / Timing Role: Standalone clock generator providing 50.0MHz system clock to ARM Cortex-A53 SoC and USB 2.0 PHY. Use Value: Factory-programmed 50.0MHz eliminates external crystal and load capacitors; µSOP footprint saves >12mm² vs. SOIC-8. |
| Cable Modems | Computer Peripherals |
Use Scenario: DOCSIS 3.1 cable modem needing low-jitter 50MHz reference for QAM64/256 demodulation and upstream burst timing. IC Role / Device Role / Timing Role: Spread-spectrum clock source feeding ADC/DAC sampling clocks and MAC-layer timing circuits. Use Value: fMOSC/4096 dither rate (12.2kHz) targets critical 1st–3rd harmonics of 50MHz, suppressing narrowband interference in RF front-end. | Use Scenario: External USB 3.0 hub requiring EMI-compliant 50MHz reference for packet timing and link training. IC Role / Device Role / Timing Role: Programmable clock generator delivering dithered 50.0MHz to USB PHY and microcontroller clock domain. Use Value: I²C reprogrammability allows field updates to dither % or prescaler if EMI test fails-no hardware respin needed. |
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 |
|---|---|---|---|
| Si5351A-B-GM | 3-output, 100MHz max, I²C-programmable PLL-based synthesizer; no factory preset frequency; higher jitter (1.5ps RMS) | Requires full firmware initialization; better for multi-frequency systems but over-specified for single 50MHz dithered clock | Select when multiple synchronized clocks or frequency agility beyond ±8% dither are required |
| ICS843001AGI-01LFT | Fixed 50MHz spread-spectrum XO with ±0.25% dither; no I²C interface; 6-pin SOT23 package; 2.5V–3.6V supply | Drop-in replacement only for static 50MHz ±0.25% dither; lacks programmability, prescaler, or power-down control | Select when lowest BOM cost and zero configuration effort are prioritized over flexibility |
Compared with Si5351A-B-GM and ICS843001AGI-01LFT, DS1089LU-450+ uniquely combines factory-programmed 50.0MHz operation, ±2% center-spread dither, I²C reprogrammability, and hardware power-down in an 8-pin µSOP-enabling EMI reduction without sacrificing design simplicity or runtime adaptability.
Availability
DS1089LU-450+ is available at Aetrix Electronics and suitable for printers, POS terminals, and cable modems requiring stable component supply, RoHS-compliant packaging, and guaranteed spread-spectrum EMI suppression performance.
Supply support for DS1089LU-450+ 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 DS1089LU-450+ belongs to the EconOscillator™ family-engineered specifically to replace fixed-frequency crystals and oscillators in EMI-sensitive digital systems while maintaining system-level timing accuracy and simplifying board layout.
FAQ
What is the factory-programmed output frequency of DS1089LU-450+?
The DS1089LU-450+ is factory-programmed to generate a precise 50.0MHz center frequency. This value is trimmed into the internal master oscillator and remains stable across temperature (-40°C to +85°C) and supply voltage (2.7V–3.6V) variations within ±0.75%. Dithering does not shift the average frequency-it only modulates output instantaneously around this 50.0MHz center point.
How does the ±2% dither setting affect electromagnetic interference in DS1089LU-450+?
The ±2% dither in DS1089LU-450+ spreads the 50.0MHz fundamental and its harmonics across a 2MHz bandwidth (±1MHz), reducing peak radiated emissions by up to 15dB compared to a fixed-frequency oscillator. Measured spectrum plots confirm strongest attenuation occurs at the 1st and 2nd harmonics-directly addressing FCC Class B compliance requirements for consumer electronics without added shielding.
Can DS1089LU-450+ operate without I²C programming in a production system?
Yes, DS1089LU-450+ operates fully stand-alone: factory settings (50.0MHz, ±2% dither, fMOSC/4096 rate) persist in NV EEPROM. SDA and SCL pins may be tied high if no in-circuit reprogramming is needed-eliminating pull-up resistors and I²C firmware overhead. Hardware controls (SPRD, OE, PDN) remain fully functional without any I²C activity.
What is the power-down current consumption of DS1089LU-450+ and how quickly does it resume operation?
DS1089LU-450+ draws ≤10µA in power-down mode (PDN = low). Upon exiting power-down (PDN = high), the device requires exactly 512 master oscillator cycles to stabilize-10.24µs at 50.0MHz-before delivering a valid 50.0MHz output. This deterministic latency enables precise timing control in power-gated subsystems without external delay circuitry.
Does DS1089LU-450+ support output frequencies below 50MHz, and how is this achieved?
Yes, DS1089LU-450+ supports output frequencies from 130kHz to 66.6MHz using its internal prescaler. With factory-set fMOSC = 50.0MHz, dividing by 256 yields 195.3kHz; further division via I²C-configurable PRESCALER register (P3–P0 bits) achieves 130kHz minimum. All prescaled outputs retain ±2% dither and 50% duty cycle, preserving timing integrity across the full range.
DS1089LU-450+ 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:
- 1:1
- Differential - Input:Output:
- No/No
- Frequency - Max:
- 50MHz
- 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
DS1089LU-450+ FAQ
1.How can I place an order for DS1089LU-450+ through Aetrix?
Please submit a Request for Quotation (RFQ) for DS1089LU-450+ 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 DS1089LU-450+ reliable?
The price and inventory of DS1089LU-450+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DS1089LU-450+ is usually 5 days.
3.What payment methods are accepted for DS1089LU-450+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS1089LU-450+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DS1089LU-450+?
DS1089LU-450+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DS1089LU-450+ 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 DS1089LU-450+?
For technical support, including DS1089LU-450+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS1089LU-450+ requirements.
6.How does Aetrix verify that DS1089LU-450+ is sourced from the original manufacturer or authorized distributors?
All DS1089LU-450+ 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 DS1089LU-450+ meets industry standards.
7.What is the process for return or replacement of DS1089LU-450+?
All DS1089LU-450+ units undergo pre-shipment inspection (PSI). If there is an issue with DS1089LU-450+, 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 DS1089LU-450+ part is unused and in its original packaging.
Return procedure for DS1089LU-450+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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