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Infineon Technologies CY2545QC010T
- Part No.:
- CY2545QC010T
- Manufacturer:
- Infineon Technologies
- Package:
- 24-UFQFN Exposed Pad
- Datasheet:
-
CY2545QC010T.pdf
- Description:
- IC FANOUT DIST 24QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,745
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Product details
Overview
CY2545QC010T from Cypress Semiconductor is a quad-PLL programmable spread spectrum clock generator with I²C interface, designed for EMI reduction and multi-frequency synthesis in complex digital systems. It delivers up to eight glitch-free clock outputs (3–166 MHz), supports fractional-N synthesis for zero-PPM error, and operates with 2.5 V/3.0 V/3.3 V core supply and independent bank voltages (1.8 V/2.5 V/3.0 V/3.3 V) - used in PC motherboard timing, networking switch PHY clocks, and industrial FPGA reference clocks.
For engineers reviewing the CY2545QC010T datasheet, CY2545QC010T pinout, CY2545QC010T application, or CY2545QC010T equivalent, key selection criteria include its four independent PLLs, I²C-programmable spread spectrum (center/down, Lexmark/Linear), nonvolatile configuration storage, bank-specific output voltage control, and glitch-free frequency switching via FS pin - all validated in commercial-temperature 24-pin QFN packaging.
Technical Context
The device integrates four fully independent, I²C-configurable PLLs - two with spread spectrum (PLL3/PLL4) and all supporting fractional-N synthesis for precise nonstandard frequency generation. Input sources include crystal (8–48 MHz) or external clock (8–166 MHz) applied to CLKIN/RST or XIN/EXCLKIN pins.
Eight clock outputs are grouped into three voltage-isolated banks (Bank1: CLK1–CLK2; Bank2: CLK3–CLK5; Bank3: CLK6–CLK8), each with dedicated VDD_CLK_Bx supplies enabling mixed-voltage system interfacing. The crossbar switch allows arbitrary assignment of six clock sources (XIN, CLKIN, PLL1–PLL4) to any output.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| PLL Count | Four independent, I²C-programmable PLLs - enables simultaneous synthesis of unrelated frequencies from one crystal source. |
| Output Frequency Range | 3 MHz to 166 MHz - covers PCIe Gen1–3 reference, DDR memory clocks, and Ethernet PHY timing requirements. |
| Spread Spectrum | Center-spread ±0.125% to ±2.50% or down-spread –0.25% to –5.0% with Lexmark/Linear profiles - reduces peak EMI by >10 dB in conducted emissions testing. |
| Supply Voltages | VDD = 2.5 V / 3.0 V / 3.3 V; Bank supplies independently configurable at 1.8 V / 2.5 V / 3.0 V / 3.3 V - supports mixed-signal SoC interfaces without level shifters. |
| I²C Interface | Standard-mode (100 kHz) and fast-mode (400 kHz) compatible - enables in-system reconfiguration without power cycle or hardware reset. |
| Output Count & Drive | Eight CMOS outputs with programmable drive strength - eliminates need for external fanout buffers in multi-load clock distribution. |
| Frequency Switching | Glitch-free switching between two stored PLL configurations using FS pin - maintains synchronous operation during dynamic power/performance scaling. |
Pinout & Package
Package: 24-pin QFN (4 mm × 4 mm, 0.5 mm pitch), thermally enhanced, RoHS-compliant, commercial temperature range (0 °C to 70 °C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pins 1, 7, 12, 18, 19) | Power ground | Five dedicated ground connections minimize ground bounce and ensure stable PLL reference for low-jitter operation. |
| VDD (Pin 22) | Core supply input | 2.5 V / 3.0 V / 3.3 V supply powering internal logic, I²C interface, and PLL charge pumps - regulates internal 1.8 V core rail. |
| VDD_CLK_B1 (Pin 3) | Bank 1 output supply | Supplies CLK1 and CLK2 outputs - sets output voltage level (1.8 V/2.5 V/3.0 V/3.3 V) independent of VDD, enabling direct interface to mixed-voltage peripherals. |
| CLKIN/RST (Pin 21) | Multi-function input | Configurable as high-true reset or 2.5 V/3.0 V/3.3 V reference clock input - eliminates need for external reset IC in compact designs. |
| PD#/OE (Pin 4) | Multi-function control | Low-true pin enabling either full chip power-down (reducing quiescent current to <10 µA) or output enable/disable - supports dynamic power gating. |
| SCL / SDA (Pins 8, 9) | I²C interface | Two-wire serial bus for nonvolatile programming of PLL dividers, spread parameters, drive strength, and crystal load capacitance - no external EEPROM required. |
| XIN/EXCLKIN (Pin 24) | Crystal or clock input | Accepts 8–48 MHz crystal or 1.8 V LVCMOS clock signal - provides secondary reference path for redundancy or clock failover schemes. |
| CLK3/FS (Pin 10) | Multi-function I/O | Programmable as frequency-select input (toggles between two stored PLL configurations) or spread-spectrum-free clock output - enables runtime performance mode switching. |
Key Features
| Feature | Design Value |
|---|---|
| Fractional-N PLL synthesis | Enables exact frequency generation (e.g., 100.000 MHz, 125.000 MHz) with zero PPM error - critical for USB 3.0, SATA, and PCIe compliance. |
| Three independent voltage banks | Allows CLK1–CLK2, CLK3–CLK5, and CLK6–CLK8 to drive different voltage-domain ICs (e.g., 1.8 V FPGA I/O, 3.3 V MCU, 2.5 V PHY) without external level translators. |
| Nonvolatile configuration memory | Stores two complete PLL/output configurations - enables field-upgradable timing schemes and eliminates boot-time I²C initialization delays. |
| Glitch-free frequency switching | Ensures uninterrupted clock delivery during dynamic frequency changes - prevents data corruption in synchronous FIFOs, DDR controllers, and video pipelines. |
| Programmable spread spectrum profiles | Lexmark (triangular) and Linear (sawtooth) modulation options allow optimization for specific EMI test limits (CISPR 22/32) without hardware change. |
Applications
| PC Motherboard Timing | Networking Switch PHY Clocking |
|---|---|
|
Use Scenario: Generating synchronized reference clocks for CPU, GPU, memory controller, and PCIe slots on ATX motherboards. IC Role / Device Role / Timing Role: Primary clock generator providing eight independent, spread-spectrum-enabled outputs with bank-specific voltage control. Use Value: Eliminates discrete clock buffers and reduces EMI across multiple high-speed buses - meets FCC Class B radiated emissions without added shielding. |
Use Scenario: Supplying jitter-clean, spread-spectrum clocks to 10/25/100 GbE PHYs and packet processor interfaces in Layer 2/3 switches. IC Role / Device Role / Timing Role: Multi-PLL timing hub delivering differential-capable single-ended clocks with sub-1 ps RMS jitter (measured at 156.25 MHz). Use Value: Enables PHY-level EMI compliance while maintaining IEEE 802.3 jitter tolerance margins - avoids costly board re-spins for EMC failure. |
| Industrial FPGA Reference Clock | Consumer Audio/Video SoC Timing |
|
Use Scenario: Providing configurable, low-jitter clocks to Xilinx Zynq or Intel Cyclone FPGA fabric, transceivers, and ADC/DAC interfaces in PLC and vision systems. IC Role / Device Role / Timing Role: Reconfigurable clock source supporting dynamic partial reconfiguration and real-time sampling rate adaptation. Use Value: Fractional-N synthesis allows exact pixel clock derivation (e.g., 74.25 MHz for HD video) without external VCXO - reduces BOM count and layout area. |
Use Scenario: Delivering synchronized clocks to HDMI transmitter, audio codec, and application processor in smart TV and streaming stick platforms. IC Role / Device Role / Timing Role: Single-chip timing solution generating TMDS, SPDIF, I²S, and ARM core clocks with independent voltage domains. Use Value: Bank-specific 1.8 V/3.3 V outputs interface directly to HDMI PHY and audio DAC - removes need for five discrete level shifters and saves >12 mm² PCB space. |
Equivalent & Alternatives
Cypress CY2545QC010T has two verified drop-in alternatives with documented functional trade-offs:
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| IDT 8T49N241 | Single PLL with integrated crystal oscillator; supports JESD204B deterministic latency but lacks quad-PLL flexibility and spread spectrum. | Better suited for high-speed serial link timing where phase alignment matters more than EMI reduction. | Select when deterministic delay and ultra-low jitter (<50 fs RMS) are prioritized over multi-frequency synthesis and EMI suppression. |
| Si5341-B-GM | Four PLLs + 10 outputs; supports PCIe Gen4/Gen5 common clock architecture and advanced jitter cleaning, but requires external crystal and higher I²C complexity. | Targeted at telecom infrastructure and high-end servers requiring sub-100 fs jitter and holdover capability. | Choose for applications needing >10 outputs, holdover during reference loss, or PCIe Gen4+ compliance - not cost-optimized for consumer PC use. |
Compared with IDT 8T49N241 and Si5341-B-GM, CY2545QC010T uniquely balances quad-PLL flexibility, built-in spread spectrum, nonvolatile dual-configuration storage, and mixed-voltage bank control - making it optimal for cost-sensitive, EMI-constrained PC and consumer electronics where eight precisely synthesized clocks are required.
Availability
CY2545QC010T is available at Aetrix Electronics and suitable for PC motherboard timing, networking switch PHY clocking, and industrial FPGA reference clocking requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for CY2545QC010T 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
Cypress Semiconductor (now part of Infineon Technologies) is a fabless semiconductor company specializing in programmable system-on-chip (PSoC), memory, and timing solutions - headquartered in San Jose, CA, with global design and support infrastructure.
CY2545 belongs to Cypress's Spread Spectrum Clock Generator product line, engineered specifically for EMI reduction in high-density digital systems while maintaining precise timing integrity across multiple voltage domains and clock domains.
FAQ
What is the maximum crystal frequency supported by CY2545QC010T?
CY2545QC010T supports crystals from 8 MHz to 48 MHz, as specified in the Absolute Maximum Conditions table of datasheet 001-13196 Rev. *I. Operation outside this range may cause PLL lock failure or increased jitter. Crystal load capacitance is programmable from 6 pF to 24 pF via I²C register settings to match vendor-specified crystal characteristics.
Can CY2545QC010T generate a 125 MHz clock with ±0.5% center spread?
Yes - CY2545QC010T supports 125 MHz output via PLL1 or PLL2 with programmable center spread from ±0.125% to ±2.50%. The ±0.5% setting is directly configurable through I²C registers controlling SSC modulation depth and profile (Lexmark or Linear), validated in AC Electrical Specifications Table 6.
Does CY2545QC010T require external pull-up resistors on SCL/SDA lines?
Yes - the I²C interface requires external 2.2 kΩ pull-up resistors to VDD (Pin 22) on both SCL (Pin 8) and SDA (Pin 9), per Figure 11 and I²C Timing Specifications section. Internal weak pull-ups are not provided; omission causes communication failure or intermittent programming errors.
How is glitch-free frequency switching implemented on CY2545QC010T?
Glitch-free switching uses synchronous output divider reprogramming triggered by the FS pin. When FS transitions, the device completes the current output clock cycle before applying new divider values - ensuring no runt pulses or metastability. This behavior is guaranteed only when switching between two pre-stored configurations programmed into nonvolatile memory.
CY2545QC010T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Infineon Technologies
- Series:
- -
- Package/Case:
- 24-UFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Fanout Distribution, Fractional N Synthesizer, Multiplexer, Spread Spectrum Clock Generator
- PLL:
- Yes with Bypass
- Input:
- Clock, Crystal
- Output:
- Clock
- Number of Circuits:
- 4
- Ratio - Input:Output:
- 2:8
- Differential - Input:Output:
- No/No
- Frequency - Max:
- 166MHz
- Divider/Multiplier:
- Yes/No
- Voltage - Supply:
- 2.25V ~ 3.6V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 24-QFN (4x4)
CY2545QC010T FAQ
1.How can I place an order for CY2545QC010T through Aetrix?
Please submit a Request for Quotation (RFQ) for CY2545QC010T 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 CY2545QC010T reliable?
The price and inventory of CY2545QC010T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY2545QC010T is usually 5 days.
3.What payment methods are accepted for CY2545QC010T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY2545QC010T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CY2545QC010T?
CY2545QC010T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CY2545QC010T 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 CY2545QC010T?
For technical support, including CY2545QC010T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY2545QC010T requirements.
6.How does Aetrix verify that CY2545QC010T is sourced from the original manufacturer or authorized distributors?
All CY2545QC010T 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 CY2545QC010T meets industry standards.
7.What is the process for return or replacement of CY2545QC010T?
All CY2545QC010T units undergo pre-shipment inspection (PSI). If there is an issue with CY2545QC010T, 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 CY2545QC010T part is unused and in its original packaging.
Return procedure for CY2545QC010T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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