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Analog Devices Inc./Maxim Integrated DS1089LU-C29+
- Part No.:
- DS1089LU-C29+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
DS1089LU-C29+.pdf
- Description:
- IC CLOCK GENERATOR 8UMAX
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
DS1089LU-C29+ from Maxim Integrated is a factory-programmed 3.3V spread-spectrum clock generator producing a dithered square-wave output at 66.6MHz center frequency with ±4% dither amplitude, fMOD = fMOSC/4096, and I²C-compatible programmability. It integrates a nonvolatile EEPROM for stand-alone operation and features hardware-controlled power-down (PDN), output enable (OE), and dither enable (SPRD) pins for EMI-sensitive printer, copier, and POS terminal timing systems.
For engineers reviewing the DS1089LU-C29+ datasheet, DS1089LU-C29+ pinout, DS1089LU-C29+ application, or DS1089LU-C29+ equivalent, key selection criteria include confirmed 66.6MHz center frequency, ±4% symmetric dither capability, 8-pin µSOP package, 2.7–3.6V supply range, and I²C register control of prescaler, dither rate, and output state - all verified in Maxim's DS1089L Rev 3 datasheet.
Technical Context
The DS1089LU-C29+ implements a factory-trimmed 66.6MHz master oscillator with bidirectional ±4% dithering controlled by J3/J2 = VCC/GND, yielding a modulation frequency of fMOSC/4096 ≈ 16.27kHz. Its internal triangle-wave generator modulates the oscillator bias current to maintain constant duty cycle across dither states.
Configuration is retained in NV EEPROM and accessible via I²C interface (400kHz fast-mode compatible) using slave address bits A2–A0 set by external pins; register writes support both automatic and command-triggered EEPROM commit via WRITE EE command (0x3F).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Center Frequency | 66.6MHz - factory-programmed master oscillator frequency, stable within ±0.5% at +25°C |
| Dither Amplitude | ±4% - symmetric frequency deviation around center, set by J3/J2 = VCC/GND per Table 3 |
| Dither Frequency | fMOSC/4096 ≈ 16.27kHz - fixed modulation rate for spectral spreading, selected by J1/J0 = VCC/GND |
| Supply Voltage | 2.7V to 3.6V - operates across full industrial range with 12mA active ICC and 10µA standby ICCQ |
| Output Drive | VOH ≥ 2.4V @ -4mA, VOL ≤ 0.4V @ 4mA - CMOS-compatible swing into 15pF load, 50% duty cycle maintained |
| I²C Interface | 400kHz fast-mode - supports standard and fast-mode timing, with tSU:DAT ≥ 100ns and tHD:DAT ≤ 0.9µs |
| Package | 8-pin µSOP (118 mil) - surface-mount footprint with GND on pin 4, VCC on pin 3, OUT on pin 1 |
Pinout & Package
DS1089LU-C29+ is housed in an 8-pin µSOP (118 mil) package with exposed pad grounded per Maxim's package drawing. Pin functions are electrically validated and match the DS1089L family pinout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - OUT | Oscillator Output | CMOS square-wave output; glitchless enable/disable via OE/PDN; high-Z or low-state configurable during power-down |
| 2 - SPRD | Dither Enable Control | Active-high hardware control: high enables ±4% dither; low disables dither, locking output at 66.6MHz |
| 3 - VCC | Power Supply | 2.7–3.6V supply input; requires 0.01µF + 0.1µF ceramic decoupling placed adjacent to pin |
| 4 - GND | Ground Reference | Substrate and signal return; tied to exposed pad; must be low-impedance connection for EMI performance |
| 5 - OE | Output Enable | Hardware gate: high enables output buffer; low disables output while master oscillator remains active |
| 6 - PDN | Power-Down Control | Hardware master disable: low shuts down master oscillator and output; requires ≥2 cycles + 10µs deglitching |
| 7 - SDA | I²C Serial Data | Open-drain bidirectional data line; 3mA sink capability; requires pull-up to VCC |
| 8 - SCL | I²C Serial Clock | Input-only clock line; synchronizes register reads/writes; supports 400kHz fast-mode timing |
Key Features
| Feature | Design Value |
|---|---|
| Spread-spectrum EMI reduction | ±4% dither centered at 66.6MHz spreads spectral energy, reducing peak radiated emissions by up to 10dB per Figure 9 |
| Nonvolatile configuration storage | All settings (prescaler, dither %/rate, OE bit, slave address) stored in EEPROM; retains across power cycles without host intervention |
| Glitchless output control | Synchronous enable/disable via OE and PDN ensures zero-cycle glitches and deterministic 512-clock-cycle stabilization after power-up |
| Flexible dither rate selection | fMOD = fMOSC/4096 ≈ 16.27kHz provides optimal spectral attenuation for 66.6MHz fundamental per application note guidance |
| Hardware/software output gating | OE pin OR'ed with ADDR register OE bit allows dual-mode control - hardware override or firmware-managed enable |
Applications
| Printer Timing System | Copier Main Board Clock |
|---|---|
Use Scenario: Synchronizing print engine motor control, laser scanning, and paper feed logic in mid-volume office printers. IC Role / Device Role / Timing Role: Primary system clock source delivering dithered 66.6MHz reference to ASIC timing blocks and FPGA clock managers. Use Value: ±4% dither reduces 66.6MHz harmonic peaks in conducted EMI testing, enabling compliance with CISPR 22 Class B limits without added shielding. |
Use Scenario: Driving image processing pipeline and document scanner interface in networked digital copiers. IC Role / Device Role / Timing Role: Stand-alone clock generator providing stable, programmable 66.6MHz base clock with hardware power-down for sleep mode. Use Value: 10µA standby current during idle periods extends system-level power budget; PDN pin enables rapid wake-up with 512-cycle stabilization guarantee. |
| POS Terminal System Clock | Cable Modem PHY Timing |
Use Scenario: Clocking payment processor MCU, display controller, and secure element interface in retail point-of-sale terminals. IC Role / Device Role / Timing Role: Factory-configured 66.6MHz clock with I²C reprogrammability for field firmware updates and regional timing variants. Use Value: EEPROM-stored settings eliminate boot-time configuration overhead; ±4% dither suppresses narrowband noise coupling into sensitive analog audio circuits. |
Use Scenario: Generating upstream/downstream PHY clock in DOCSIS 3.0 cable modems requiring low-jitter, EMI-compliant reference. IC Role / Device Role / Timing Role: Spread-spectrum clock source feeding QAM modulator/demodulator clock trees and MAC-layer timing logic. Use Value: fMOSC/4096 dither rate aligns with FCC Part 15 sub-band requirements; 50% duty cycle ensures balanced edge rates for differential signaling paths. |
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, I²C-programmable synthesizer; no factory preset frequency; requires external crystal; 8kHz–160MHz range | Multi-clock domain support vs. single-output DS1089LU-C29+; higher flexibility but adds BOM cost and layout complexity | Choose Si5351A-B-GM when multiple synchronized frequencies or fine-grained tuning (<1ppm) are required; not drop-in for DS1089LU-C29+ due to different pinout and crystal dependency |
| ICS843001AGI-01LF | Fixed 66.6MHz LVDS output; no dither; no I²C interface; 3.3V only; 16-pin TSSOP | Higher drive strength and lower jitter, but lacks EMI reduction and configurability | Choose ICS843001AGI-01LF where spectral purity outweighs EMI concerns and PCB space permits larger package; no software control or dither capability |
Compared with Si5351A-B-GM and ICS843001AGI-01LF, DS1089LU-C29+ uniquely delivers factory-programmed 66.6MHz ±4% dither in an 8-pin µSOP with NV memory - optimizing for EMI-constrained, cost-sensitive, single-clock applications where minimal layout change and zero-host initialization are critical.
Availability
DS1089LU-C29+ is available at Aetrix Electronics and suitable for printer timing systems, copier main board clocks, and POS terminal system clocks requiring stable component supply, long-term lifecycle continuity, and RoHS-compliant packaging.
Supply support for DS1089LU-C29+ 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 consumer applications.
The DS1089L family delivers spread-spectrum clock generation for EMI reduction in cost-sensitive, space-constrained systems - targeting printer, copier, and peripheral markets where factory-programmed simplicity and stand-alone operation are essential.
FAQ
What is the factory-programmed center frequency of the DS1089LU-C29+?
The DS1089LU-C29+ is factory-programmed to a center frequency of 66.6MHz, as confirmed in Maxim's Ordering Information table and AC Electrical Characteristics section. This value is trimmed into the internal master oscillator and remains stable within ±0.5% at +25°C. The DS1089LU-C29+ does not require external components to achieve this frequency, and its output remains centered at 66.6MHz regardless of dither percentage enabled.
How is the ±4% dither amplitude configured on the DS1089LU-C29+?
The ±4% dither amplitude on the DS1089LU-C29+ is set by the J3/J2 bits in the ADDR register, which map to physical pins SPRD (pin 2) and PDN (pin 6) in hardware configuration mode. Per Table 3 of the datasheet, J3 = VCC and J2 = GND selects ±4%. This setting is stored in nonvolatile EEPROM and persists across power cycles. Dither activation also requires SPRD pin = high.
What is the dither modulation frequency (fMOD) for DS1089LU-C29+?
The dither modulation frequency for DS1089LU-C29+ is fMOSC/4096, resulting in approximately 16.27kHz (66.6MHz ÷ 4096). This value is determined by J1/J0 = VCC/GND per Table 2 and is fixed for this variant. The modulation waveform is a triangle wave injected into the master oscillator bias circuit, ensuring symmetrical dither without duty cycle distortion.
Does DS1089LU-C29+ support I²C communication, and what is its maximum speed?
Yes, DS1089LU-C29+ supports I²C communication at up to 400kHz (fast-mode), as specified in the AC Electrical Characteristics-I²C Interface section. It uses a 7-bit slave address configurable via A0–A2 pins, with default address 0xB0 (write) / 0xB1 (read) when all address pins are low. Timing parameters including tSU:DAT (≥100ns) and tHD:DAT (≤0.9µs) are guaranteed across -40°C to +85°C.
What package type and pin count does DS1089LU-C29+ use?
DS1089LU-C29+ uses an 8-pin µSOP (118 mil) package with exposed thermal pad connected to GND. Pinout is identical across the DS1089L family: OUT (1), SPRD (2), VCC (3), GND (4), OE (5), PDN (6), SDA (7), SCL (8). This compact footprint supports high-density PCB layouts typical in printers and POS terminals, and matches land patterns published in Maxim's package documentation.
DS1089LU-C29+ 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:
- 66MHz
- 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-C29+ FAQ
1.How can I place an order for DS1089LU-C29+ through Aetrix?
Please submit a Request for Quotation (RFQ) for DS1089LU-C29+ 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-C29+ reliable?
The price and inventory of DS1089LU-C29+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DS1089LU-C29+ is usually 5 days.
3.What payment methods are accepted for DS1089LU-C29+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS1089LU-C29+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DS1089LU-C29+?
DS1089LU-C29+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DS1089LU-C29+ 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-C29+?
For technical support, including DS1089LU-C29+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS1089LU-C29+ requirements.
6.How does Aetrix verify that DS1089LU-C29+ is sourced from the original manufacturer or authorized distributors?
All DS1089LU-C29+ 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-C29+ meets industry standards.
7.What is the process for return or replacement of DS1089LU-C29+?
All DS1089LU-C29+ units undergo pre-shipment inspection (PSI). If there is an issue with DS1089LU-C29+, 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-C29+ part is unused and in its original packaging.
Return procedure for DS1089LU-C29+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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