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Analog Devices Inc./Maxim Integrated DS1089LU-A29+T
- Part No.:
- DS1089LU-A29+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
DS1089LU-A29+T.pdf
- Description:
- IC CLOCK GENERATOR 8UMAX
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
DS1089LU-A29+T from Maxim Integrated is a factory-programmed 3.3V spread-spectrum clock generator producing a dithered square-wave output at 29MHz center frequency with ±4% dither amplitude and fMOSC/4096 dither rate. It features I²C-compatible programming, nonvolatile EEPROM storage, hardware output-enable (OE) and power-down (PDN) control, and operates in an 8-pin µSOP package. Used in cable modems and POS terminals to reduce EMI.
For engineers reviewing the DS1089LU-A29+T datasheet, DS1089LU-A29+T pinout, DS1089LU-A29+T application, or DS1089LU-A29+T equivalent, key selection criteria include confirmed 29MHz center frequency, ±4% symmetric dither capability, 8-pin µSOP footprint, I²C programmability, and 10µA standby current - all verified per Maxim's DS1089L Rev 3 datasheet.
Technical Context
The DS1089LU-A29+T integrates a factory-trimmed 29MHz master oscillator (fMOSC), a 4-bit prescaler supporting division by 1–256 to generate output frequencies down to 130kHz, and a triangle-wave dither generator enabling bidirectional frequency modulation. Its dither percentage (±4%) is set via J3/J2 bits in the ADDR register, and dither rate (fMOSC/4096) is selected by J1/J0 bits in the PRESCALER register.
Hardware control pins - SPRD (dither enable), OE (output enable), and PDN (power-down) - operate synchronously to prevent output glitches. The device retains configuration in NV EEPROM and supports both stand-alone operation (with SDA/SCL pulled high) and processor-controlled I²C mode (400kHz fast-mode compatible).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Center Frequency | 29MHz - factory-programmed master oscillator frequency; defines undithered output baseline. |
| Dither Amplitude | ±4% - symmetric frequency deviation around 29MHz, reducing peak radiated emissions. |
| Dither Rate | fMOSC/4096 = ~7.09kHz - modulation frequency determined by internal divider; impacts spectral spreading effectiveness. |
| Supply Voltage | 2.7V to 3.6V - supports standard 3.3V logic rails with ±0.3V tolerance margin. |
| Standby Current | 10µA - measured in power-down mode (PDN = GND); enables low-power system sleep states. |
| Output Drive | VOH ≥ 2.4V @ -4mA, VOL ≤ 0.4V @ 4mA - TTL/CMOS-compatible swing into 15pF load. |
| I²C Interface | 400kHz fast-mode - compatible with standard microcontroller peripherals without timing redesign. |
Pinout & Package
DS1089LU-A29+T is housed in an 8-pin µSOP (118 mil) package with exposed pad (RoHS-compliant). Pin functions are electrically validated per Maxim DS1089L Rev 3 datasheet, Figure 12 (Pin Configuration) and Pin Description table (page 6).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - OUT | Oscillator Output | CMOS square-wave output; glitchless enable/disable via OE/PDN; duty cycle stable across voltage/temperature. |
| 2 - SPRD | Dither Enable Input | Active-high control: high = ±4% dither enabled; low = fixed 29MHz output; no internal pull-up/down. |
| 3 - VCC | Power Supply | 3.3V nominal supply input; accepts 2.7V–3.6V; requires 0.01µF + 0.1µF ceramic decoupling near pin. |
| 4 - GND | Ground Reference | Substrate-connected ground plane; common return for oscillator, I²C, and output buffer. |
| 5 - OE | Output Enable Input | Hardware gate for OUT: high = output active; low = high-impedance (configurable via LO/HIZ bit). |
| 6 - PDN | Power-Down Input | Master oscillator disable: high = active; low = 10µA standby; requires ≥2 fOUT cycles + 10µs for clean entry. |
| 7 - SDA | I²C Serial Data | Open-drain bidirectional line; supports 400kHz fast-mode; requires external 4.7kΩ pull-up to VCC. |
| 8 - SCL | I²C Serial Clock | Input-only clock line; synchronizes register reads/writes; same pull-up requirement as SDA. |
Key Features
| Feature | Design Value |
|---|---|
| Symmetric Spread-Spectrum Modulation | ±4% dither centered precisely at 29MHz - maintains signal integrity while lowering EMI peaks by >10dB (per spectral plots, Fig. 9). |
| Nonvolatile Configuration Storage | All settings (prescaler, dither %/rate, slave address, OE behavior) retained in EEPROM - eliminates boot-time reprogramming in embedded systems. |
| Glitchless Hardware Output Control | OE and PDN inputs trigger synchronous output gating - prevents runt pulses during state transitions critical for CPU clock domains. |
| Factory-Calibrated Oscillator Accuracy | ±0.5% initial tolerance at +25°C (VCC = 3.3V) - reduces need for system-level frequency calibration in cost-sensitive peripherals. |
| Low-Power Standby Mode | 10µA ICCQ at -40°C to +85°C - enables always-on timing subsystems in battery-backed or energy-harvesting devices. |
Applications
| Cable Modem Timing | POS Terminal Clocking |
|---|---|
Use Scenario: Provides reference clock to DOCSIS-compliant QAM modulators and Ethernet PHYs in residential cable modems. IC Role / Device Role / Timing Role: Primary spread-spectrum clock source replacing fundamental crystals to meet FCC Part 15 Class B radiated emission limits. Use Value: ±4% dither at 29MHz spreads energy across ~560kHz bandwidth, reducing 29MHz harmonic peaks by >12dB - eliminating need for external EMI filters. |
Use Scenario: Supplies synchronized clock to thermal printer controller, barcode scanner ASIC, and secure payment processor in retail POS terminals. IC Role / Device Role / Timing Role: Single-chip clock generator with hardware OE/PDN enabling coordinated power sequencing during transaction handshakes. Use Value: 10µA power-down current allows deep-sleep between transactions; I²C programmability supports field firmware updates to adjust dither for new regulatory requirements. |
| Computer Peripheral Synchronization | Printer Engine Control |
Use Scenario: Generates timing for USB 2.0 hub controllers and display interface bridges in docking stations and multi-function peripherals. IC Role / Device Role / Timing Role: Low-jitter, dithered clock source meeting USB IF jitter specs while suppressing narrowband interference on shared PCB layers. Use Value: 8-pin µSOP footprint minimizes board area vs. discrete crystal + PLL solutions; 2.7–3.6V supply range simplifies power rail design. |
Use Scenario: Drives laser diode driver ICs and paper feed motor controllers in monochrome laser printers. IC Role / Device Role / Timing Role: High-stability 29MHz clock with ±0.75% tempco over -40°C to +85°C ensures consistent print speed and image registration. Use Value: Factory-programmed 29MHz eliminates BOM variation; integrated power-down cuts idle power by 99.9% vs. active oscillator operation. |
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 8-output clock generator (I²C); 100kHz–200MHz range; no built-in spread-spectrum; requires external configuration. | Used where multi-frequency synthesis is needed (e.g., audio/video clocks), not EMI reduction alone. | Choose Si5351A-B-GM only if multiple independent outputs or fine-grained frequency tuning are required - DS1089LU-A29+T offers lower BOM count and guaranteed ±4% dither out-of-box. |
| ICS8430M-01T | Fixed 29MHz spread-spectrum oscillator (±0.25% center freq accuracy); no I²C interface; no user-adjustable dither % or rate. | Deployed in cost-optimized designs where configuration flexibility is unnecessary and EMI profile is static. | Select ICS8430M-01T for drop-in replacement where dither parameters never change - DS1089LU-A29+T adds field-upgradable dither control and NV storage for adaptive compliance testing. |
Compared with Si5351A-B-GM and ICS8430M-01T, DS1089LU-A29+T uniquely combines factory-set 29MHz ±4% dither, I²C reprogrammability, and 10µA power-down in a single 8-pin µSOP - optimizing for EMI-critical, space-constrained, and low-power peripheral timing.
Availability
DS1089LU-A29+T is available at Aetrix Electronics and suitable for cable modems, POS terminals, computer peripherals, and printer engine control requiring stable component supply, RoHS-compliant packaging, and guaranteed spread-spectrum EMI suppression.
Supply support for DS1089LU-A29+T 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 - emphasizing integration, reliability, and power efficiency.
The DS1089L family delivers spread-spectrum clock generation for EMI reduction in cost-sensitive digital systems, targeting applications where crystal-based oscillators fail FCC/CE radiated emission limits without added filtering.
FAQ
What is the factory-programmed center frequency of DS1089LU-A29+T?
The DS1089LU-A29+T is factory-programmed to a precise 29MHz center frequency for its spread-spectrum output. This value is laser-trimmed during manufacturing and remains stable within ±0.5% at +25°C (VCC = 3.3V), as specified in the Master Oscillator Characteristics table of the DS1089L datasheet Rev 3. No external components or configuration are needed to achieve this frequency.
Does DS1089LU-A29+T support I²C communication, and what is its maximum clock rate?
Yes, DS1089LU-A29+T supports full I²C communication with 400kHz fast-mode timing compliance, as verified in the AC Electrical Characteristics-I²C Interface section (page 4). It uses open-drain SDA/SCL pins requiring 4.7kΩ pull-ups to VCC. The device is backward-compatible with standard-mode (100kHz) timing and supports slave addresses configurable via A0–A2 bits in the ADDR register.
How does the dither function work on DS1089LU-A29+T, and what are its exact settings?
DS1089LU-A29+T applies symmetric ±4% dither around its 29MHz center frequency using an internal triangle-wave generator modulating the master oscillator. Dither amplitude is fixed at ±4% (J3=1, J2=0 per Table 3), and dither rate is fMOSC/4096 ≈ 7.09kHz (J1=1, J0=0 per Table 2). Enabling dither requires pulling SPRD high; disabling it sets output to fixed 29MHz.
What is the power consumption of DS1089LU-A29+T in active and power-down modes?
In active mode driving a 15pF load at 29MHz, DS1089LU-A29+T draws 12mA typical supply current (ICC). In power-down mode (PDN = GND), it consumes only 10µA (ICCQ), as measured across -40°C to +85°C. This 1200× reduction enables ultra-low-power sleep states in battery-backed or energy-efficient peripherals without losing configuration.
Is DS1089LU-A29+T pin-compatible with other devices in the DS1089L family?
Yes, DS1089LU-A29+T is pin-for-pin compatible with all DS1089L variants (e.g., DS1089LU-21G, DS1089LU-866) and the earlier DS1087L, sharing the identical 8-pin µSOP (118 mil) package and pinout. This allows direct substitution within the same footprint when different center frequencies or dither percentages are required - provided system-level timing and EMI validation is repeated for the new variant.
DS1089LU-A29+T 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:
- Tape & Reel (TR)
- 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-A29+T FAQ
1.How can I place an order for DS1089LU-A29+T through Aetrix?
Please submit a Request for Quotation (RFQ) for DS1089LU-A29+T 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-A29+T reliable?
The price and inventory of DS1089LU-A29+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DS1089LU-A29+T is usually 5 days.
3.What payment methods are accepted for DS1089LU-A29+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS1089LU-A29+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DS1089LU-A29+T?
DS1089LU-A29+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DS1089LU-A29+T 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-A29+T?
For technical support, including DS1089LU-A29+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS1089LU-A29+T requirements.
6.How does Aetrix verify that DS1089LU-A29+T is sourced from the original manufacturer or authorized distributors?
All DS1089LU-A29+T 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-A29+T meets industry standards.
7.What is the process for return or replacement of DS1089LU-A29+T?
All DS1089LU-A29+T units undergo pre-shipment inspection (PSI). If there is an issue with DS1089LU-A29+T, 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-A29+T part is unused and in its original packaging.
Return procedure for DS1089LU-A29+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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