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Infineon Technologies CY2544QC016
- Part No.:
- CY2544QC016
- Manufacturer:
- Infineon Technologies
- Package:
- 24-UFQFN Exposed Pad
- Datasheet:
-
CY2544QC016.pdf
- Description:
- IC CLOCK GENERATOR 24QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,573
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Product details
Overview
CY2544QC016 from Cypress Semiconductor is a quad-PLL programmable clock generator with spread spectrum capability, designed for precise multi-frequency synthesis in timing-critical systems. It delivers nine programmable LVCMOS clock outputs (3–166 MHz), supports 1.8 V input reference and 2.5/3.0/3.3 V output bank supplies, and integrates Fractional-N PLLs for zero-PPM frequency error-used in PC motherboard clock trees and embedded networking controllers.
For engineers reviewing the CY2544QC016 datasheet, CY2544QC016 pinout, CY2544QC016 application, or CY2544QC016 equivalent, key selection criteria include its four independent PLLs, per-bank voltage-selectable outputs (1.8/2.5/3.0/3.3 V), glitch-free frequency switching via FS pins, and Lexmark/Linear spread spectrum modulation for EMI reduction.
Technical Context
The CY2544QC016 implements four fully integrated Fractional-N PLLs-two with spread spectrum (PLL3/PLL4) and two without-enabling simultaneous synthesis of unrelated frequencies from a single 8–48 MHz crystal or 8–166 MHz external reference. Input compatibility includes 1.8 V LVCMOS CLKIN and XIN/EXCLKIN, while internal regulation converts 2.5/3.0/3.3 V VDD to 1.8 V core logic.
Output routing uses a crossbar switch to assign any of six sources (XIN, CLKIN, PLL1–PLL4) to each of nine clocks. Three multifunction FS pins (FS0–FS2) select among eight preconfigured frequency sets, and PD#/OE (Pin 4) operates as either global power-down or output-enable control-ensuring deterministic low-power entry and glitch-free transitions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| PLL Count | Four independent Fractional-N PLLs: PLL1–PLL4, with PLL3/PLL4 supporting spread spectrum modulation |
| Input Frequency Range | Crystal: 8–48 MHz; External reference: 8–166 MHz at 1.8 V LVCMOS level |
| Output Frequency Range | 3–166 MHz across nine LVCMOS outputs, with per-bank voltage selection (1.8/2.5/3.0/3.3 V) |
| Spread Spectrum | Center-spread ±0.125% to ±2.50% or down-spread –0.25% to –5.0%, selectable Lexmark/Linear profiles |
| Frequency Select Options | Eight distinct frequency configurations via three FS pins (FS0–FS2), enabling runtime reconfiguration |
| Jitter Performance | Low jitter outputs verified for timing-critical applications; no typical value specified but guaranteed glitch-free switching |
| Supply Voltages | VDD = 2.5/3.0/3.3 V; VDD_CLK_B1/B2/B3 independently configurable for output banks |
Pinout & Package
Package: 24-pin QFN (4 mm × 4 mm, 0.5 mm pitch), RoHS-compliant, commercial temperature range (0°C to +70°C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (GND) | Power ground | Primary analog/digital return path; connects to system ground plane |
| Pin 2 (CLK1) | Programmable clock output | Bank 1 output with spread spectrum; voltage set by VDD_CLK_B1 |
| Pin 3 (VDD_CLK_B1) | Bank 1 power supply | Supplies CLK1–CLK3; selectable 1.8/2.5/3.0/3.3 V for LVCMOS level matching |
| Pin 4 (PD#/OE) | Control input | Configurable as active-low power-down or output-enable signal |
| Pin 6 (CLK2) | Programmable clock output | Bank 1 output with spread spectrum; shares VDD_CLK_B1 rail |
| Pin 8 (CLK3/FS0) | Multi-function I/O | Either spread-spectrum-free clock output or frequency select input (FS0) |
| Pin 9 (OE/FS1) | Multi-function input | Output enable or frequency select input (FS1); determines OE behavior of selected outputs |
| Pin 10 (CLK4/FS2) | Multi-function I/O | Either clock output (no spread spectrum) or frequency select input (FS2) |
| Pin 11 (CLK5) | Programmable clock output | Bank 2 output, no spread spectrum; voltage set by VDD_CLK_B2 |
| Pin 13 (CLK6) | Programmable clock output | Bank 2 output with spread spectrum; shares VDD_CLK_B2 rail |
| Pin 14 (VDD_CLK_B2) | Bank 2 power supply | Supplies CLK4–CLK6; independent voltage setting enables mixed-voltage clock domains |
| Pin 15 (CLK7/SSON) | Multi-function I/O | Spread-spectrum clock output or SSON control input to enable/disable SSC on PLL3/PLL4 |
| Pin 16 (VDD_CLK_B3) | Bank 3 power supply | Supplies CLK7–CLK9; decoupled from other banks for noise isolation |
| Pin 17 (CLK8) | Programmable clock output | Bank 3 output with spread spectrum; voltage set by VDD_CLK_B3 |
| Pin 20 (CLK9) | Programmable clock output | Bank 3 output with spread spectrum; supports same modulation profiles as CLK7 |
| Pin 21 (CLKIN) | Reference clock input | 1.8 V LVCMOS reference input (8–166 MHz); requires valid EXCLKIN for operation |
| Pin 22 (VDD) | Main power supply | 2.5/3.0/3.3 V supply; internally regulated to 1.8 V core voltage |
| Pin 23 (XOUT) | Crystal oscillator output | Drives external crystal connected to XIN; not used when EXCLKIN mode active |
| Pin 24 (XIN/EXCLKIN) | Crystal or reference input | 8–48 MHz crystal input or 1.8 V external clock; dual-role pin with internal load capacitance |
Key Features
| Feature | Design Value |
|---|---|
| Four independent Fractional-N PLLs | Enables synthesis of up to four unrelated frequencies from one reference source, eliminating need for multiple discrete oscillators |
| Per-bank output voltage control (VDD_CLK_B1/B2/B3) | Allows concurrent generation of 1.8 V, 2.5 V, and 3.3 V clocks on same device-critical for mixed-voltage SoC interfaces |
| Glitch-free frequency switching via FS pins | Ensures uninterrupted operation during dynamic clock scaling-required for CPU throttling and power-state transitions |
| Programmable spread spectrum (center/down, Lexmark/Linear) | Reduces EMI peak amplitude by spreading energy across narrowband spectrum-validated for FCC/CE compliance in PC and networking gear |
| One-time programmable nonvolatile configuration | Stores custom PLL settings, drive strength, load capacitance, and spread parameters-eliminates boot-time configuration overhead |
Applications
| PC Motherboard Clock Tree | Networking Switch ASIC Timing |
|---|---|
Use Scenario: Generating synchronized clocks for CPU, memory controller, PCIe, and SATA interfaces on x86-based motherboards. IC Role / Device Role / Timing Role: Primary clock generator providing nine phase-aligned, voltage-matched outputs with spread spectrum applied to high-speed buses. Use Value: Eliminates discrete clock ICs and reduces BOM count; zero-PPM synthesis ensures strict PCIe Gen3/Gen4 timing margin compliance. |
Use Scenario: Supplying reference clocks to multi-port Ethernet switch ASICs requiring independent 125 MHz, 250 MHz, and 312.5 MHz rates. IC Role / Device Role / Timing Role: Multi-PLL timing hub delivering jitter-clean clocks to SerDes PHYs and packet processing units. Use Value: Fractional-N flexibility enables exact NBASE-T and 2.5G/5G/10G Ethernet rates without external dividers or jitter cleaners. |
| Embedded Industrial Controller | Consumer Set-Top Box |
Use Scenario: Providing isolated clock domains for ARM Cortex-A/M cores, DDR3/DDR4 memory, and real-time Ethernet (TSN) peripherals. IC Role / Device Role / Timing Role: Configurable clock source with bank-isolated supplies enabling independent power gating and voltage scaling per subsystem. Use Value: Per-bank VDD_CLK control allows dynamic voltage/frequency scaling (DVFS) while maintaining timing integrity across safety-critical functions. |
Use Scenario: Driving HDMI transmitter, video decoder, and audio processor clocks in cost-sensitive HD media players. IC Role / Device Role / Timing Role: Single-chip clock solution replacing multiple crystals and buffers-reducing board area and EMI emissions. Use Value: Integrated spread spectrum on HDMI pixel clock reduces radiated emissions below CISPR-22 Class B limits without added shielding. |
Equivalent & Alternatives
CY2544QC016 alternatives are limited due to its unique combination of quad Fractional-N PLLs, per-bank voltage control, and one-time programmability in 24-pin QFN.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Si5351A-B-GM | Three synthesized outputs (not nine); no per-bank voltage control; I²C-programmable (volatile), not OTP | Suitable for low-pin-count, software-configurable designs-not for fixed-function, high-reliability timing hubs | Select only if system requires runtime reconfiguration and accepts reduced output count and no spread spectrum |
| ICS8430I-01LFT | Fixed 8-output clock generator; no spread spectrum; no fractional-N synthesis; only integer PLLs | Used in legacy telecom cards where frequency flexibility and EMI reduction are not required | Choose only for cost-sensitive, static-clock applications where zero-PPM error and dynamic switching are unnecessary |
Compared with Si5351A-B-GM and ICS8430I-01LFT, CY2544QC016 provides superior frequency precision, hardware-based spread spectrum control, and nine independently configurable outputs-making it irreplaceable in high-integration PC, networking, and industrial timing applications demanding deterministic, low-jitter performance.
Availability
CY2544QC016 is available at Aetrix Electronics and suitable for PC motherboard design, networking switch timing, and industrial embedded controller applications requiring stable component supply, long-lifecycle support, and guaranteed OTP programming consistency.
Supply support for CY2544QC016 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 high-performance timing, memory, and programmable logic solutions for computing, communications, and industrial markets.
CY2544QC016 belongs to the CY254x Quad-PLL Clock Generator family, engineered for systems needing multiple precise, spread-spectrum-enabled clocks from a single reference-targeting PC, networking, and embedded applications where EMI compliance and timing margin are critical.
FAQ
Is CY2544QC016 pin-compatible with CY2546 or CY2548?
No. Although all three share the same 24-pin QFN footprint, CY2544QC016 uses 2.5/3.0/3.3 V VDD with 1.8 V input reference, while CY2546 requires 1.8 V VDD and CY2548 omits crystal support. Pin functions differ-for example, Pin 23 (XOUT) is functional in CY2544 but DNU in CY2548-and voltage domain assignments are not interchangeable.
Can spread spectrum be disabled per-output or only globally?
Spread spectrum is controlled per-PLL, not per-output. PLL3 and PLL4 support SSC; their outputs (e.g., CLK1, CLK2, CLK6, CLK7, CLK8, CLK9) inherit modulation when sourced from those PLLs. Disabling is global via CLK7/SSON pin or register bit-no individual output-level SSC enable/disable is supported.
What is the maximum allowable load capacitance on the XIN pin?
The CY2544QC016 supports crystal load capacitances of 12 pF, 18 pF, or 20 pF, programmable via OTP configuration. The recommended crystal specification (Document 001-12563, page 9) states ±10 ppm stability over temperature and 50 kΩ max ESR for reliable startup and jitter performance.
Does CY2544QC016 support I²C or SPI configuration after programming?
No. CY2544QC016 is one-time programmable (OTP) only. Configuration-including PLL ratios, spread spectrum parameters, drive strength, and bank voltages-is permanently stored during factory programming. No serial interface is present; all control is via dedicated pins (FS0–FS2, PD#/OE, SSON) and hardwired settings.
CY2544QC016 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Infineon Technologies
- Series:
- -
- Package/Case:
- 24-UFQFN Exposed Pad
- Packaging:
- Tray
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Clock Generator
- PLL:
- Yes with Bypass
- Input:
- LVCMOS, Crystal
- Output:
- Clock
- Number of Circuits:
- 4
- Ratio - Input:Output:
- 1:9
- 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)
CY2544QC016 FAQ
1.How can I place an order for CY2544QC016 through Aetrix?
Please submit a Request for Quotation (RFQ) for CY2544QC016 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 CY2544QC016 reliable?
The price and inventory of CY2544QC016 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY2544QC016 is usually 5 days.
3.What payment methods are accepted for CY2544QC016?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY2544QC016 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CY2544QC016?
CY2544QC016 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CY2544QC016 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 CY2544QC016?
For technical support, including CY2544QC016 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY2544QC016 requirements.
6.How does Aetrix verify that CY2544QC016 is sourced from the original manufacturer or authorized distributors?
All CY2544QC016 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 CY2544QC016 meets industry standards.
7.What is the process for return or replacement of CY2544QC016?
All CY2544QC016 units undergo pre-shipment inspection (PSI). If there is an issue with CY2544QC016, 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 CY2544QC016 part is unused and in its original packaging.
Return procedure for CY2544QC016:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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