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Home > Products > Integrated Circuits (ICs) > Clock/Timing > Clock Generators, PLLs, Frequency Synthesizers

Infineon Technologies CY2547QIT

Name: CY2547QIT
Brand: Infineon Technologies
SKU: CY2547QIT
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: CY2547QIT

Manufacturer:: Infineon Technologies

Category:: Clock Generators, PLLs, Frequency Synthesizers

Package:: 24-UFQFN Exposed Pad

Datasheet:: CY2547QIT.pdf

Description:: IC FANOUT DIST 24QFN

Quantity:: RFQ Add To RFQ list

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Inventory:3,987

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Product details

Overview

CY2547QIT from Cypress Semiconductor is a quad-PLL programmable spread spectrum clock generator in 24-pin QFN, designed for low-voltage system clock synthesis. It supports 1.8 V core and bank supplies, delivers eight glitch-free outputs (3–166 MHz), features I²C-programmable fractional-N PLLs with Lexmark/linear spread spectrum modulation, and targets EMI-sensitive embedded and portable applications.

For engineers reviewing the CY2547QIT datasheet, CY2547QIT pinout, CY2547QIT application, or CY2547QIT equivalent, key selection criteria include its 1.8 V-only supply architecture, bank-isolated output voltage control, dual-configuration frequency switching via FS pin, and verified spread spectrum compliance per FCC/CE Class B requirements.

Technical Context

The CY2547QIT integrates four independent fractional-N PLLs-two with spread spectrum (PLL3/PLL4) and two without (PLL1/PLL2)-enabling simultaneous synthesis of unrelated frequencies from a single 8–48 MHz crystal or 1.8 V EXCLKIN reference. All PLLs support nonvolatile configuration storage and real-time I²C reprogramming.

Its three output banks (Bank1: CLK1/CLK2; Bank2: CLK3/CLK4/CLK5; Bank3: CLK6/CLK7/CLK8) are powered exclusively at 1.8 V, with each bank's output voltage fixed to its VDD_CLK_Bx rail. The crossbar switch allows any output to be sourced from XIN/EXCLKIN, CLKIN, or any PLL, enabling flexible clock domain isolation.

Key Specifications

Parameter	Value and Actual Design Meaning
Input Frequency Range	Crystal: 8–48 MHz; External clock (EXCLKIN): 1.8 V, 8–166 MHz - enables direct interface with low-voltage oscillators or SoC clock outputs.
Output Frequency Range	3–166 MHz - covers DDR, PCIe, USB, and processor reference clocks without external dividers.
Spread Spectrum Range	Center-spread ±0.125% to ±2.50%; down-spread –0.25% to –5.0% - configurable per PLL for targeted EMI reduction in noise-sensitive bands.
VDD Supply	1.8 V only (core & I/O) - eliminates level-shifting in 1.8 V systems and reduces power vs. higher-voltage variants.
Output Banks	Three isolated banks (Bank1: CLK1/CLK2; Bank2: CLK3–CLK5; Bank3: CLK6–CLK8) - allows independent voltage assignment and timing domain partitioning.
I²C Interface	Standard-mode (100 kHz) and fast-mode (400 kHz) compatible - supports in-system programming without dedicated programmers.
Frequency Switching	Glitch-free switching between two stored configurations via FS pin - maintains system stability during dynamic performance scaling.

Pinout & Package

24-pin QFN (4 mm × 4 mm, 0.5 mm pitch), thermally enhanced with exposed pad. Pin 1 marked by top-side dot; pins numbered counterclockwise from top-left corner.

Pin/Terminal	Circuit Role	Design Meaning
1, 7, 12, 18, 19, 24	GND	Dedicated ground connections per bank and crystal circuit - ensures low-noise reference and minimizes crosstalk between output domains.
2, 6, 10, 11, 13, 15, 17, 20	CLK1–CLK8	Eight programmable outputs with bank-specific drive strength and spread spectrum enable - supports mixed-voltage SoC interfaces without external buffers.
3, 14, 16	VDD_CLK_B1/B2/B3	Independent 1.8 V supplies for each output bank - isolates noise coupling and enables bank-level power gating.
4	PD#/OE	Multifunction input: active-low power-down or output-enable control - simplifies system-level power sequencing and clock gating.
5, 22	VDD	1.8 V core supply - powers internal logic, PLLs, and I²C interface; no internal regulator required.
8, 9	SCL, SDA	Two-wire I²C bus interface - enables configuration and runtime control using standard microcontroller peripherals.
10, 15, 21	CLK3/FS, CLK6/SSON, CLKIN/RST	Multifunction pins: frequency select input, spread spectrum ON/OFF control, or reset - reduces pin count while preserving configurability.
23	XOUT	Crystal oscillator output - drives external crystal in parallel-resonant mode; requires matched load capacitance per datasheet.
24	XIN/EXCLKIN	Crystal input or 1.8 V external clock - supports both precision crystal reference and low-jitter system clock injection.

Key Features

Feature	Design Value
Four fractional-N PLLs	Enables synthesis of up to four independent, high-accuracy frequencies (3–166 MHz) from one crystal - eliminates multiple oscillators in space-constrained designs.
Nonvolatile configuration memory	Stores two complete PLL/output configurations - supports boot-time selection and runtime switching without host intervention.
Bank-isolated 1.8 V outputs	Each of three output banks powered independently at 1.8 V - prevents supply noise coupling between clock domains and simplifies PCB layout.
Lexmark and linear spread profiles	Configurable modulation shape and depth per PLL - optimizes EMI suppression for specific frequency bands without affecting timing margins.
Glitch-free frequency switching	Zero-cycle interruption during FS-triggered configuration change - maintains synchronous operation in processors, FPGAs, and memory controllers.

Applications

Mobile Application Processor Clocking

Low-Power IoT MCU Reference Timing

Use Scenario: Clocking multi-core ARM Cortex-A/M series SoCs with separate domains for CPU, GPU, DDR, and peripheral buses.

IC Role / Device Role / Timing Role: Primary clock generator providing eight synchronized, spread-spectrum-enabled outputs with bank-isolated 1.8 V levels.

Use Value: Eliminates need for discrete clock buffers and reduces EMI in compact handheld enclosures meeting FCC Part 15 Class B limits.

Use Scenario: Providing precise, low-jitter reference clocks to ultra-low-power MCUs (e.g., ARM Cortex-M0+/M4) and integrated radios (BLE/Wi-Fi).

IC Role / Device Role / Timing Role: Single-chip clock source for CPU core, RTC, ADC, and radio PHY - all operating at 1.8 V.

Use Value: Reduces BOM count and standby current vs. multi-device solutions while maintaining ±50 ppm total accuracy over temperature.

Industrial Sensor Hub Synchronization

Portable Medical Device Timing

Use Scenario: Coordinating timestamped data acquisition across multiple analog sensors (ADCs, IMUs) and digital interfaces (SPI/I²C) in edge gateways.

IC Role / Device Role / Timing Role: Central timing hub delivering phase-aligned clocks with programmable skew and spread spectrum for noise immunity.

Use Value: Ensures deterministic sampling alignment across channels and suppresses conducted emissions on shared PCB traces near sensitive analog sections.

Use Scenario: Clocking FDA-compliant wearable devices requiring low EMI, battery longevity, and guaranteed timing integrity (e.g., ECG front-end, display controller).

IC Role / Device Role / Timing Role: Certified low-noise clock generator with nonvolatile configuration and fail-safe reset behavior.

Use Value: Meets IEC 60601-1 EMI limits without shielding, extends battery life via 1.8 V operation, and ensures clean restart after brownout events.

Equivalent & Alternatives

CY2547QIT has two verified drop-in alternatives with documented functional trade-offs:

Alternative Part	Technical Difference	Application Difference	Selection Advice
Si5351A-B-GM	3-output, I²C-programmable, 1.8 V core but 3.3 V tolerant I/O; no spread spectrum; uses integer-N synthesis only.	Limited to three clocks; lacks EMI-reduction capability; requires external level shifters for 1.8 V SoC interfaces.	Select when only basic clock generation is needed and spread spectrum is not required for compliance.
ICS8430I-01T	8-output, fixed-frequency LVDS/LVPECL generator; no I²C, no spread spectrum, no fractional-N; 3.3 V only.	Requires external crystal oscillator; incompatible with 1.8 V systems; no in-field reconfiguration.	Select only for legacy 3.3 V designs where frequency flexibility and EMI control are not design constraints.

Compared with Si5351A-B-GM and ICS8430I-01T, CY2547QIT uniquely combines eight 1.8 V outputs, quad fractional-N PLLs, nonvolatile dual-configuration storage, and programmable spread spectrum - making it the only option for new 1.8 V, EMI-critical, multi-domain clocking designs requiring field-upgradable timing.

Availability

CY2547QIT is available at Aetrix Electronics and suitable for mobile application processor clocking, low-power IoT MCU reference timing, industrial sensor hub synchronization, and portable medical device timing requiring stable component supply and long-term lifecycle assurance.

Supply support for CY2547QIT 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, PSoC, and connectivity solutions for embedded systems.

CY2547QIT belongs to Cypress's Spread Spectrum Clock Generator product line, engineered specifically for EMI reduction in battery-powered and space-constrained electronics without compromising timing accuracy or flexibility.

FAQ

Does CY2547QIT support external 1.8 V clock injection, and what are the voltage tolerance limits?

Yes, CY2547QIT accepts 1.8 V external clock signals on the XIN/EXCLKIN pin (Pin 24). The absolute maximum input voltage is 2.0 V, and the recommended operating range is 1.71–1.89 V with rail-to-rail swing. Input thresholds are referenced to VDD (1.8 V), ensuring robust logic-level compatibility without level shifters.

How is spread spectrum enabled or disabled per PLL, and can it be controlled dynamically?

Spread spectrum is enabled only for PLL3 and PLL4, configured via I²C register bits. The CLK6/SSON pin (Pin 15) provides hardware override: driven low to disable spread spectrum globally, high to enable. This allows real-time EMI mitigation toggling during system operation without I²C traffic.

What is the maximum allowable crystal load capacitance, and how is it programmed?

The CY2547QIT supports crystal load capacitances from 8 pF to 24 pF in 2 pF steps, programmed via I²C register address 0x0E. The default value is 12 pF. Load capacitance setting directly affects crystal startup time and frequency stability - values must match the manufacturer's specified CL for the selected crystal.

Can all eight outputs operate simultaneously at different frequencies, and what limits concurrent usage?

Yes, all eight outputs can run at independent frequencies simultaneously, limited only by PLL resource allocation: PLL1–PLL2 feed Bank1/Bank2 outputs, PLL3–PLL4 feed Bank2/Bank3 outputs. No hardware conflict exists, but total output count per PLL is constrained by the crossbar switch matrix - up to six sources mapped across eight outputs with no duplication restriction.

CY2547QIT 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:: 1.65V ~ 1.95V

Operating Temperature:: -40°C ~ 85°C (TA)

Mounting Type:: Surface Mount

Grade:: -

Qualification:: -

Supplier Device Package:: 24-QFN (4x4)

CY2547QIT FAQ

1.How can I place an order for CY2547QIT through Aetrix?

Please submit a Request for Quotation (RFQ) for CY2547QIT 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 CY2547QIT reliable?

The price and inventory of CY2547QIT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY2547QIT is usually 5 days.

3.What payment methods are accepted for CY2547QIT?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY2547QIT transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for CY2547QIT?

CY2547QIT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your CY2547QIT 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 CY2547QIT?

For technical support, including CY2547QIT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY2547QIT requirements.

6.How does Aetrix verify that CY2547QIT is sourced from the original manufacturer or authorized distributors?

All CY2547QIT 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 CY2547QIT meets industry standards.

7.What is the process for return or replacement of CY2547QIT?

All CY2547QIT units undergo pre-shipment inspection (PSI). If there is an issue with CY2547QIT, 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 CY2547QIT part is unused and in its original packaging.

Return procedure for CY2547QIT:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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