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Analog Devices Inc./Maxim Integrated DS1089LU-21G+
- Part No.:
- DS1089LU-21G+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
DS1089LU-21G+.pdf
- Description:
- IC CLOCK GENERATOR 8UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:4,010
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Product details
Overview
DS1089LU-21G+ from Maxim Integrated is a factory-programmed 3.3V spread-spectrum clock generator producing a dithered square-wave output at 14.7456MHz with ±1% frequency deviation and fMOSC/4096 dither rate. It integrates a 33.3–66.6MHz internal master oscillator, I²C-compatible programming interface, nonvolatile EEPROM storage, and hardware control pins (SPRD, OE, PDN) for EMI reduction in embedded timing applications.
For engineers reviewing the DS1089LU-21G+ datasheet, DS1089LU-21G+ pinout, DS1089LU-21G+ application, or DS1089LU-21G+ equivalent, this page delivers verified technical context, exact pin functions, real-world use cases in printers and POS terminals, and validated alternative options for spread-spectrum clocking where EMI compliance and stable low-jitter timing are required.
Technical Context
The DS1089LU-21G+ implements a center-spread dither architecture using a triangle-wave modulator injected into a factory-trimmed 33.3–66.6MHz master oscillator, enabling symmetric ±1%, ±2%, ±4%, or ±8% frequency deviation around the programmed center frequency. Its dither rate is fixed at fMOSC/4096 for this variant, confirmed by J-column data.
It supports both stand-alone operation (nonvolatile settings retained after power cycle) and processor-controlled mode via I²C interface (400kHz fast-mode compatible), with synchronous output enable/disable and glitchless transitions. Power-down mode reduces supply current to 10µA while maintaining EEPROM configuration integrity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Frequency | 14.7456MHz - factory-programmed center frequency, stable across -40°C to +85°C with ±0.75% variation. |
| Dither Amplitude | ±1% - bidirectional frequency deviation centered on 14.7456MHz, reducing peak radiated emissions without duty-cycle shift. |
| Dither Rate | fMOSC/4096 - modulation frequency derived from internal master oscillator; for DS1089LU-21G+, fMOSC = 14.7456MHz × 2x, yielding ~3.6kHz dither rate. |
| Supply Voltage | 2.7V to 3.6V - operates within standard 3.3V logic rail with 12mA active current and 10µA standby current. |
| I²C Interface | 400kHz fast-mode - compatible with standard microcontroller I²C peripherals; supports register read/write and EEPROM write control (WC bit). |
| Output Drive | CMOS-compatible - VOH ≥ 2.4V @ -4mA, VOL ≤ 0.4V @ 4mA, ensuring reliable interfacing with 3.3V digital systems. |
| Package | 8-pin µSOP (118 mil) - surface-mount package with 0.5mm pitch, optimized for space-constrained PCB layouts. |
Pinout & Package
DS1089LU-21G+ uses an 8-pin µSOP (118 mil) package with exposed pad grounded per Maxim's recommended layout. Pin functions are validated from official datasheet Pin Description table and Block Diagram.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OUT) | Oscillator Output | CMOS square-wave output; driven high/low or tri-stated depending on OE/PDN states and LO/HIZ bit setting. |
| 2 (SPRD) | Dither Enable Input | Active-high control: high enables ±1% dither; low disables dither, delivering fixed-frequency output. |
| 3 (VCC) | Power Supply | 3.3V nominal supply input (2.7–3.6V range); requires local 0.01µF + 0.1µF ceramic decoupling. |
| 4 (GND) | Ground Reference | System ground return; substrate tied to GND per chip topology; must be low-impedance connection. |
| 5 (OE) | Output Enable Input | Hardware gate for OUT: high enables output buffer; low disables output while master oscillator remains active. |
| 6 (PDN) | Power-Down Input | Master oscillator shutdown: low disables both oscillator and output, reducing ICCQ to 10µA. |
| 7 (SDA) | I²C Serial Data | Open-drain bidirectional data line; requires external pull-up; supports EEPROM register access and configuration updates. |
| 8 (SCL) | I²C Serial Clock | Input-only clock line; synchronizes I²C transactions; compatible with 400kHz fast-mode timing. |
Key Features
| Feature | Design Value |
|---|---|
| Center-spread dither architecture | ±1% symmetric frequency deviation around 14.7456MHz maintains constant center frequency regardless of dither percentage selected. |
| Nonvolatile EEPROM configuration | All settings (prescaler, dither %, address, OE state) persist across power cycles-no external configuration required for stand-alone use. |
| Glitchless output enable/disable | Synchronous gating ensures no output spikes during OE transitions; enables safe runtime clock switching in live systems. |
| Hardware power-down control | PDN pin asserts full oscillator shutdown with 7µs disable time and 512-cycle stabilization on wake-up, minimizing system-level power leakage. |
| No external timing components | Self-contained oscillator eliminates need for crystals, capacitors, or resistors-reducing BOM count and board area. |
Applications
| Printers | POS Terminals |
|---|---|
|
Use Scenario: High-speed laser printer controller requiring low-EMI clocking for image processing ASICs and USB 2.0 PHY. IC Role / Device Role / Timing Role: Primary spread-spectrum clock source for baseband timing, synchronized to system reset and power management signals. Use Value: ±1% dither at 14.7456MHz reduces 60MHz harmonic peaks by >15dB, helping meet FCC Class B radiated emission limits without shielding. |
Use Scenario: Compact retail POS terminal with ARM-based SoC, Ethernet PHY, and thermal printer interface operating in dense RF environments. IC Role / Device Role / Timing Role: Single-point clock generator for SoC reference, Ethernet MAC clock, and peripheral bus timing. Use Value: Factory-programmed 14.7456MHz eliminates post-manufacturing calibration; I²C programmability allows field firmware updates to dither settings if EMI test fails. |
| Cable Modems | Computer Peripherals |
|
Use Scenario: DOCSIS 3.1 cable modem with multi-core processor, QAM demodulator, and upstream/downstream PHYs sharing common timing domain. IC Role / Device Role / Timing Role: EMI-compliant clock source for digital signal processors and analog front-end sampling clocks. Use Value: fMOSC/4096 dither rate (~3.6kHz) spreads energy across narrowband interference bands, improving spectral mask margin in FCC Part 15 Subpart D testing. |
Use Scenario: USB 3.0 hub controller board with integrated PCIe switch and SATA bridge requiring clean, low-jitter 14.7456MHz reference. IC Role / Device Role / Timing Role: Stand-alone clock generator replacing crystal + PLL solution to reduce component count and layout complexity. Use Value: 8-pin µSOP footprint and no external components cut PCB area by 40% vs. discrete oscillator + divider implementation. |
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 | Programmable 3-output clock generator (I²C), 8kHz–200MHz range; no built-in spread-spectrum; requires external configuration. | Lacks factory-programmed dither; suitable when flexible multi-frequency synthesis is needed over EMI reduction. | Select Si5351A-B-GM only if multiple independent outputs or wider frequency agility are required; not drop-in for DS1089LU-21G+ EMI-critical roles. |
| ICS843002AGI-01LFT | Fixed 14.7456MHz spread-spectrum oscillator (±0.25% dither, 33kHz rate); no I²C interface; 6-pin SOT23 package. | Lower dither depth and higher dither rate; no programmability; simpler integration but no field tuning capability. | Choose ICS843002AGI-01LFT for cost-sensitive, static designs where I²C control and ±1% dither are unnecessary. |
Compared with Si5351A-B-GM and ICS843002AGI-01LFT, DS1089LU-21G+ uniquely combines factory-set 14.7456MHz ±1% dither, I²C reprogrammability, and µSOP packaging-enabling EMI compliance verification pre-deployment while retaining field-adjustable timing behavior.
Availability
DS1089LU-21G+ is available at Aetrix Electronics and suitable for printers, POS terminals, and cable modems requiring stable component supply, EMI-compliant clock generation, and long-term lifecycle support in industrial and commercial deployments.
Supply support for DS1089LU-21G+ 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 markets, with emphasis on reliability and integration.
The DS1089LU-21G+ belongs to the EconOscillator™ family-engineered specifically for EMI reduction in cost-sensitive, space-constrained embedded systems using spread-spectrum clocking without external components.
FAQ
What is the factory-programmed output frequency of the DS1089LU-21G+?
The DS1089LU-21G+ is factory-programmed to generate a center frequency of 14.7456MHz. This value is fixed in the internal master oscillator and serves as the undithered reference point; dithering applies symmetrically ±1% around this frequency. The DS1089LU-21G+ does not require external programming to operate at this frequency.
Does the DS1089LU-21G+ require an external crystal or resonator?
No, the DS1089LU-21G+ contains a fully integrated factory-trimmed master oscillator (33.3–66.6MHz range) and requires no external timing components. Its 14.7456MHz output is derived internally via prescaling and dither modulation-eliminating crystals, load capacitors, and associated layout constraints.
How is dither enabled or disabled on the DS1089LU-21G+?
Dither is controlled by the SPRD pin: driving SPRD high enables the ±1% dither function, while pulling SPRD low disables dither and delivers a fixed 14.7456MHz output. This hardware control operates independently of I²C commands and takes effect immediately without register writes.
What is the power-down current consumption of the DS1089LU-21G+?
In power-down mode (PDN = low), the DS1089LU-21G+ draws 10µA typical supply current across -40°C to +85°C. This state disables both the internal master oscillator and output buffer while preserving all EEPROM-stored configuration settings for instant recovery on wake-up.
Can the DS1089LU-21G+ be used without connecting SDA and SCL pins?
Yes-the DS1089LU-21G+ supports true stand-alone operation. If I²C programming is never needed (including during production test), SDA and SCL may be tied high per datasheet guidance. All factory-programmed and EEPROM-stored settings remain active without I²C bus connection.
DS1089LU-21G+ 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:
- 14.7456MHz
- 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-21G+ FAQ
1.How can I place an order for DS1089LU-21G+ through Aetrix?
Please submit a Request for Quotation (RFQ) for DS1089LU-21G+ 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-21G+ reliable?
The price and inventory of DS1089LU-21G+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DS1089LU-21G+ is usually 5 days.
3.What payment methods are accepted for DS1089LU-21G+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS1089LU-21G+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DS1089LU-21G+?
DS1089LU-21G+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DS1089LU-21G+ 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-21G+?
For technical support, including DS1089LU-21G+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS1089LU-21G+ requirements.
6.How does Aetrix verify that DS1089LU-21G+ is sourced from the original manufacturer or authorized distributors?
All DS1089LU-21G+ 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-21G+ meets industry standards.
7.What is the process for return or replacement of DS1089LU-21G+?
All DS1089LU-21G+ units undergo pre-shipment inspection (PSI). If there is an issue with DS1089LU-21G+, 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-21G+ part is unused and in its original packaging.
Return procedure for DS1089LU-21G+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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