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Analog Devices Inc./Maxim Integrated MAX31C80T-UGQ+
- Part No.:
- MAX31C80T-UGQ+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
MAX31C80T-UGQ+.pdf
- Description:
- IC CLOCK GENERATOR 10TDFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,177
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Product details
Overview
MAX31C80T-UGQ+ from Maxim Integrated is a center-dithered spread-spectrum clock generator IC that synthesizes a 100MHz output clock from a 27MHz crystal input using an integrated PLL. It delivers ±1.5% center-spread modulation at 31.25kHz dither rate, operates from 3.0V to 3.6V, and supports automotive-grade operation from −40°C to +125°C. Used in graphics cards and infotainment systems to reduce EMI.
For engineers reviewing the MAX31C80T-UGQ+ datasheet, MAX31C80T-UGQ+ pinout, MAX31C80T-UGQ+ application, or MAX31C80T-UGQ+ equivalent, key selection criteria include confirmed center-spread dither capability, factory-programmed 100MHz/27MHz configuration, TDFN-EP package compatibility, and automotive temperature compliance.
Technical Context
The MAX31C80T-UGQ+ integrates a programmable PLL with dedicated spread-spectrum magnitude control logic driven by SMSEL0/SMSEL1 pins. Its architecture enables precise center-dither modulation (±0.25% to ±1.5%) without external components, while maintaining low cycle-to-cycle jitter (75ps typical at 100MHz).
It accepts either a 27MHz crystal (X1–X2) or 27MHz clock input, buffers the input on XOUT, and generates a spread-modulated CLKOUT. The device requires no configuration registers - dither magnitude and mode are set solely by static logic levels on two digital select pins.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Frequency | 100MHz - factory-programmed, stable clock for high-speed video interfaces or processor clocks |
| Input Frequency | 27MHz crystal - enables low-cost, low-ESR crystal use instead of expensive high-frequency oscillators |
| Dither Type | Center-spread (±1.5%) - reduces peak EMI across carrier ±1.5% bandwidth without shifting fundamental frequency |
| Dither Rate | 31.25kHz - optimized to avoid audible noise and fall outside sensitive RF bands |
| Supply Voltage | 3.3V (3.0–3.6V range) - compatible with standard automotive 3.3V power rails and LDO outputs |
| Jitter (Cycle-to-Cycle) | 75ps typ @ 100MHz - meets timing margin requirements for DDR2/3 memory clocks and PCIe reference clocks |
| Operating Temperature | −40°C to +125°C - qualified for under-hood automotive infotainment and ADAS domain controllers |
Pinout & Package
MAX31C80T-UGQ+ is housed in a 10-pin TDFN-EP package (3mm × 3mm × 0.8mm) with exposed pad (EP) for thermal and electrical grounding.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| X1 | Crystal drive / clock input | Primary oscillator input; accepts 27MHz crystal (with 18pF load) or 27MHz CMOS clock |
| X2 | Crystal drive output | Completes crystal resonator path; must be left open if clock input used on X1 |
| VCC (pins 3, 8) | Power supply | Dual VCC pins minimize IR drop and improve PSRR for clean clock synthesis |
| GND (pins 4, 7) | Ground reference | Dual GND pins provide low-inductance return paths for analog and digital sections |
| CLKOUT | Spread-spectrum clock output | 100MHz modulated output with ±1.5% center dither; drives 7pF load with <1.6ns edge rates |
| XOUT | Buffered input clock output | Non-modulated 27MHz replica of X1 input; useful for system clock distribution or feedback |
| SMSEL0 / SMSEL1 | Dither magnitude select | Two-level logic inputs configuring ±0.25% to ±1.5% spread; require power cycle to update |
| EP | Exposed thermal pad | Must be soldered to PCB ground plane for thermal dissipation and noise reduction |
Key Features
| Feature | Design Value |
|---|---|
| Factory-programmed 100MHz output | Eliminates need for external configuration; guarantees exact frequency and dither settings at power-up |
| Center-spread spectrum modulation | Maintains nominal 100MHz center frequency while spreading energy - critical for FCC/CE radiated emissions compliance |
| Low 75ps cycle-to-cycle jitter | Preserves timing margins in high-speed serial links (e.g., DisplayPort, SATA) without requiring additional jitter cleaners |
| Automotive temperature range (−40°C to +125°C) | Validated for direct mounting in infotainment head units and instrument clusters without derating |
| 3.3V single-supply operation | Direct interface with automotive MCU I/O domains and PMIC LDO outputs; no level-shifting required |
Applications
| Graphics Cards | Set-Top Boxes |
|---|---|
Use Scenario: Reducing EMI from GPU pixel clocks operating near 100MHz in compact PCB layouts. IC Role / Device Role / Timing Role: Primary spread-spectrum clock generator providing EMI-compliant 100MHz pixel clock to display interface controller. Use Value: Achieves >10dB peak EMI reduction at 100MHz without altering board layout or adding shielding. | Use Scenario: Clocking video decoder SoCs in consumer STBs where radiated emissions must meet CISPR 32 Class B limits. IC Role / Device Role / Timing Role: System clock source delivering 100MHz reference to HDMI transmitter and video processing pipeline. Use Value: Enables pass-fail compliance testing at final assembly without post-layout EMI mitigation rework. |
| Automotive Infotainment | Printers |
Use Scenario: Supplying synchronized clock to touchscreen controller and audio codec in head unit modules. IC Role / Device Role / Timing Role: Automotive-qualified clock generator producing 100MHz spread-spectrum clock for multi-domain SoC peripherals. Use Value: Meets AEC-Q100 Grade 2 requirements and eliminates separate EMI filters on clock traces. | Use Scenario: Driving high-resolution image sensor and print engine timing in multifunction printers. IC Role / Device Role / Timing Role: Low-jitter clock source for image data capture and motor control synchronization. Use Value: Reduces electromagnetic interference with adjacent wireless modules (Wi-Fi/BT) in shared enclosure. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar spread-spectrum clock generation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Si5351A-B-GM | Programmable I²C-based clock generator; supports multiple outputs but requires external configuration; no built-in spread-spectrum modulation | Used where flexible multi-frequency synthesis is needed, not fixed 100MHz EMI reduction | Select only if system includes I²C host and needs >1 output; MAX31C80T-UGQ+ offers simpler, preprogrammed, automotive-qualified solution |
| ICS843001AGI-01LFT | Fixed 100MHz center-spread clock generator; same dither rate (31.25kHz) and ±1.5% spread, but rated only to +85°C | Suitable for commercial-grade STBs or printers, not automotive under-hood environments | Choose when cost sensitivity outweighs temperature requirement; MAX31C80T-UGQ+ adds −40°C to +125°C qualification and dual VCC/GND pins |
Compared with Si5351A-B-GM and ICS843001AGI-01LFT, the MAX31C80T-UGQ+ uniquely combines factory-programmed 100MHz/27MHz operation, automotive temperature rating, and zero-config center-spread functionality in a 10-pin TDFN - eliminating firmware dependencies and thermal derating concerns.
Availability
MAX31C80T-UGQ+ is available at Aetrix Electronics and suitable for graphics cards, automotive infotainment systems, and set-top boxes requiring stable component supply with guaranteed EMI-reduction performance.
Supply support for MAX31C80T-UGQ+ 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 power management ICs for automotive, industrial, and communications markets.
The MAX31C80 series targets EMI-sensitive timing applications requiring certified spread-spectrum clock generation with minimal design overhead and automotive reliability.
FAQ
What is the factory-programmed output frequency of the MAX31C80T-UGQ+?
The MAX31C80T-UGQ+ is factory-programmed to generate a precise 100MHz spread-spectrum clock output from a 27MHz crystal input. This configuration is fixed and cannot be altered in-circuit - the device powers up immediately with this frequency and center-dither modulation enabled, eliminating need for configuration registers or external programming.
Does the MAX31C80T-UGQ+ support both crystal and clock input modes?
Yes, the MAX31C80T-UGQ+ accepts either a 27MHz crystal connected between X1 and X2, or a 27MHz CMOS clock applied to X1 alone (with X2 left open). The internal oscillator circuitry automatically adapts, and the buffered XOUT pin replicates the input signal regardless of source type - enabling flexible integration into existing clock tree architectures.
What is the dither magnitude and rate for the MAX31C80T-UGQ+?
The MAX31C80T-UGQ+ provides center-spread modulation with a factory-set dither magnitude of ±1.5% and dither rate of 31.25kHz. These values are permanently programmed and do not require pin strapping - SMSEL0/SMSEL1 are internally tied to configure this specific setting, ensuring consistent EMI reduction performance across all units.
Is the MAX31C80T-UGQ+ qualified for automotive applications?
Yes, the MAX31C80T-UGQ+ is fully qualified for automotive use with guaranteed operation from −40°C to +125°C and compliance with AEC-Q100 stress test requirements. Its dual VCC/GND pins, exposed thermal pad, and robust ESD protection (per HBM spec) make it suitable for infotainment head units, digital clusters, and ADAS domain controllers deployed in harsh vehicle environments.
How does the MAX31C80T-UGQ+ reduce electromagnetic interference?
The MAX31C80T-UGQ+ reduces EMI by applying center-spread spectrum modulation to its 100MHz CLKOUT signal - dynamically varying the output frequency within ±1.5% around 100MHz at 31.25kHz. This spreads spectral energy over a wider bandwidth, lowering peak radiated emissions by up to 12dB compared to a fixed-frequency clock, directly supporting FCC Part 15 and CISPR 22/32 compliance.
MAX31C80T-UGQ+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 10-WFDFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Spread Spectrum Clock Generator
- PLL:
- Yes with Bypass
- Input:
- Clock, Crystal
- Output:
- LVCMOS, Crystal
- Number of Circuits:
- 1
- Ratio - Input:Output:
- 1:2
- Differential - Input:Output:
- No/No
- Frequency - Max:
- 100MHz
- Divider/Multiplier:
- No/No
- Voltage - Supply:
- 3V ~ 3.6V
- Operating Temperature:
- -40°C ~ 125°C
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 10-TDFN (3x3)
MAX31C80T-UGQ+ FAQ
1.How can I place an order for MAX31C80T-UGQ+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX31C80T-UGQ+ 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 MAX31C80T-UGQ+ reliable?
The price and inventory of MAX31C80T-UGQ+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX31C80T-UGQ+ is usually 5 days.
3.What payment methods are accepted for MAX31C80T-UGQ+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX31C80T-UGQ+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX31C80T-UGQ+?
MAX31C80T-UGQ+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX31C80T-UGQ+ 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 MAX31C80T-UGQ+?
For technical support, including MAX31C80T-UGQ+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX31C80T-UGQ+ requirements.
6.How does Aetrix verify that MAX31C80T-UGQ+ is sourced from the original manufacturer or authorized distributors?
All MAX31C80T-UGQ+ 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 MAX31C80T-UGQ+ meets industry standards.
7.What is the process for return or replacement of MAX31C80T-UGQ+?
All MAX31C80T-UGQ+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX31C80T-UGQ+, 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 MAX31C80T-UGQ+ part is unused and in its original packaging.
Return procedure for MAX31C80T-UGQ+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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