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

Renesas RC22504A000GNK#BB0

Name: RC22504A000GNK#BB0
Brand: Renesas
SKU: RC22504A000GNK#BB0
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: RC22504A000GNK#BB0

Manufacturer:: Renesas

Category:: Clock Generators, PLLs, Frequency Synthesizers

Package:: 24-WFQFN Exposed Pad

Datasheet:: RC22504A000GNK#BB0.pdf

Description:: IC FREQ SYNTH 24VFQFPN

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Product details

Overview

RC22504A000GNK#BB0 from Renesas Electronics is a FemtoClock®2 sub-100fs frequency synthesizer IC designed for ultra-low-jitter clock generation adjacent to high-speed PHYs, switches, ASICs, or FPGAs. It delivers 64 fs RMS jitter (10 kHz–20 MHz), supports 10 MHz–1 GHz output frequencies, features 4 differential / 8 LVCMOS outputs, and operates with a 25–80 MHz crystal/XO input - enabling reference clocking for 100G/400G Ethernet systems.

For engineers reviewing the RC22504A000GNK#BB0 datasheet, RC22504A000GNK#BB0 pinout, RC22504A000GNK#BB0 application, or RC22504A000GNK#BB0 equivalent, key selection criteria include phase jitter performance under 100 fs, programmable DCO tuning granularity (<1 ppb), fractional-feedback Analog PLL architecture, differential output swing configurability (400–800 mV), and OTP-based auto-configuration after reset.

Technical Context

The RC22504A000GNK#BB0 integrates a fractional-N Analog PLL (APLL) core with independent frequency synthesis from its 25–80 MHz crystal/XO input - eliminating dependency on reference frequency for output stability. Its APLL includes a voltage-controlled oscillator (VCO), programmable loop filter (LPF), and lock detector, supporting both frequency synthesizer and digitally controlled oscillator (DCO) modes.

It provides four integer output dividers feeding configurable clock drivers that support HCSL (DC-coupled), LVDS/LVPECL/CML (AC-coupled), or dual LVCMOS outputs. Output enable control, programmable status reporting, and up to four OTP-stored configurations enable flexible integration into OTN mappers, fiber-optic modules, and high-speed switch reference architectures.

Key Specifications

Parameter	Value and Actual Design Meaning
Phase Jitter (RMS)	64 fs (10 kHz–20 MHz); meets stringent jitter budgets for 100G/400G SerDes and OTU4 timing compliance.
Output Frequency Range	10 MHz–1 GHz (differential), 10–180 MHz (LVCMOS); covers PCIe Gen5, IEEE 802.3bs, OTU3/OTU4, and CPRI/eCPRI requirements.
Input Reference	25–80 MHz crystal or XO; enables use of low-cost, industry-standard timing sources without external buffering.
Differential Output Swing	Selectable 400–800 mV; allows optimization for signal integrity across varied PCB trace lengths and termination schemes.
DCO Tuning Granularity	<1 ppb; supports precise frequency margining for system-level timing validation and OTN clock alignment.
Serial Interface	I²C (≤1 MHz) or SPI (≤20 MHz); enables real-time reconfiguration and dynamic frequency adjustment in live systems.
Package	4 × 4 mm 24-QFN; compact footprint suitable for dense high-speed board layouts near PHY/FPGA interfaces.

Pinout & Package

RC22504A000GNK#BB0 is housed in a 4 mm × 4 mm, 24-pin QFN package with exposed thermal pad. Pin assignments follow standard top-view layout per Renesas R31DS0043EU0112 Rev.1.12 Figure 1.

Pin/Terminal	Circuit Role	Design Meaning
CLKIN / nCLKIN	Differential reference clock input	Accepts AC-coupled LVDS/LVPECL or DC-coupled HCSL; enables bypass of internal crystal oscillator for external reference use.
XTAL / XO	Crytal/XO input pair	Drives internal crystal oscillator; supports fundamental-mode crystals from 25–80 MHz with load capacitance matching.
OUT0–OUT3	Differential clock outputs	Configurable as HCSL (DC), LVDS/LVPECL/CML (AC), or LVCMOS; each with independent divider and amplitude control.
OE	Output Enable input	Hardware-controlled global enable/disable of all outputs; supports power sequencing and hot-plug isolation.
LOCK	PLL lock status indicator	Open-drain output signals stable APLL lock; used for system readiness monitoring and fault detection.
SCL / SDA / SCLK / SDIO	I²C/SPI serial interface	Supports configuration, register read/write, and status polling without requiring dedicated MCU GPIO resources.

Key Features

Feature	Design Value
Fractional-feedback APLL architecture	Enables independent output frequency synthesis regardless of input crystal frequency - critical for multi-rate systems using fixed-frequency crystals.
Four OTP-configurable profiles	Allows field-programmable startup behavior (e.g., different output frequencies, formats, or dividers) without firmware intervention at power-on.
Programmable output buffer types	Single device supports HCSL, LVDS, LVPECL, CML, and LVCMOS signaling - reducing BOM count and layout variants across platform generations.
Differential output amplitude control	Adjustable 400–800 mV swing per output pair optimizes eye opening and EMI across varying channel loss and receiver sensitivity.
Integrated loss-of-signal and activity monitors	On-chip comparators and interrupt logic detect input failure or output stall - enabling autonomous system health management without host CPU polling.

Applications

100G/400G Ethernet PHY Reference Clocking	OTN OTU3/OTU4 Mapper Timing
Use Scenario: Generating synchronized reference clocks for multi-lane 100G/400G Ethernet PHYs in optical transport or data center switch line cards. IC Role / Device Role / Timing Role: Primary low-jitter frequency synthesizer providing parallel differential clocks to SerDes lanes with sub-100fs phase noise. Use Value: Enables compliance with IEEE 802.3bs jitter masks and reduces bit error rate (BER) in PAM4 links by minimizing deterministic jitter accumulation.	Use Scenario: Delivering adjustable, high-stability reference clocks to OTU3 (43.018 Gbps) and OTU4 (111.81 Gbps) mappers in carrier-grade DWDM systems. IC Role / Device Role / Timing Role: Digitally controlled oscillator (DCO) with <1 ppb tuning resolution for precise frequency alignment and margin testing during OTN frame synchronization. Use Value: Supports ITU-T G.709 compliant clock recovery and eliminates need for external VCXO + DAC combinations in timing modules.
Programmable Fiber-Optic Transceiver Modules	High-Speed FPGA/ASIC Clock Distribution
Use Scenario: Providing configurable reference clocks inside pluggable optical modules (e.g., QSFP-DD, OSFP) where space and power are constrained. IC Role / Device Role / Timing Role: Compact, single-chip clock generator with integrated crystal oscillator and OTP-based auto-configuration for module-level timing independence. Use Value: Reduces module BOM count by replacing discrete oscillators, buffers, and configuration EEPROMs while maintaining full frequency flexibility.	Use Scenario: Distributing multiple synchronized clock domains to FPGA transceivers, memory controllers, and processing subsystems in AI accelerator or networking SoC carrier boards. IC Role / Device Role / Timing Role: Multi-output clock synthesizer with independent dividers and format selection per output, placed adjacent to FPGA clock inputs. Use Value: Eliminates interposer-induced skew and jitter degradation by localizing clock generation - improving setup/hold margins for DDR5 and高速 transceivers.

100G/400G Ethernet PHY Reference Clocking

OTN OTU3/OTU4 Mapper Timing

Use Scenario: Generating synchronized reference clocks for multi-lane 100G/400G Ethernet PHYs in optical transport or data center switch line cards.

IC Role / Device Role / Timing Role: Primary low-jitter frequency synthesizer providing parallel differential clocks to SerDes lanes with sub-100fs phase noise.

Use Value: Enables compliance with IEEE 802.3bs jitter masks and reduces bit error rate (BER) in PAM4 links by minimizing deterministic jitter accumulation.

Use Scenario: Delivering adjustable, high-stability reference clocks to OTU3 (43.018 Gbps) and OTU4 (111.81 Gbps) mappers in carrier-grade DWDM systems.

IC Role / Device Role / Timing Role: Digitally controlled oscillator (DCO) with <1 ppb tuning resolution for precise frequency alignment and margin testing during OTN frame synchronization.

Use Value: Supports ITU-T G.709 compliant clock recovery and eliminates need for external VCXO + DAC combinations in timing modules.

Programmable Fiber-Optic Transceiver Modules

High-Speed FPGA/ASIC Clock Distribution

Use Scenario: Providing configurable reference clocks inside pluggable optical modules (e.g., QSFP-DD, OSFP) where space and power are constrained.

IC Role / Device Role / Timing Role: Compact, single-chip clock generator with integrated crystal oscillator and OTP-based auto-configuration for module-level timing independence.

Use Value: Reduces module BOM count by replacing discrete oscillators, buffers, and configuration EEPROMs while maintaining full frequency flexibility.

Use Scenario: Distributing multiple synchronized clock domains to FPGA transceivers, memory controllers, and processing subsystems in AI accelerator or networking SoC carrier boards.

IC Role / Device Role / Timing Role: Multi-output clock synthesizer with independent dividers and format selection per output, placed adjacent to FPGA clock inputs.

Use Value: Eliminates interposer-induced skew and jitter degradation by localizing clock generation - improving setup/hold margins for DDR5 and高速 transceivers.

Equivalent & Alternatives

The following parts are listed as comparable options for similar frequency synthesizer applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
Si5341-B-GM	Higher channel count (12 outputs), wider frequency range (0.002–750 MHz), but higher typical jitter (95 fs RMS) and larger 7×7 mm package.	Better suited for multi-protocol systems requiring >4 outputs or sub-MHz clock generation; less optimal for ultra-low-jitter 100G PHY placement.	Choose Si5341-B-GM when needing >4 outputs or sub-MHz clock synthesis; RC22504A000GNK#BB0 preferred for jitter-critical, space-constrained 4-output designs.
LMK04832ISQE/NOPB	Two-stage jitter cleaner architecture (PLL1 + PLL2), lower integrated jitter (50 fs) but requires external VCO and larger solution size; no integrated crystal oscillator.	Used in RF and test equipment where ultimate phase noise matters more than board area; lacks OTP auto-configuration and direct crystal drive.	Choose LMK04832ISQE/NOPB for ultra-low-noise instrumentation; RC22504A000GNK#BB0 offers better integration, smaller footprint, and simpler design-in for telecom/datacom PHY clocking.

Compared with Si5341-B-GM and LMK04832ISQE/NOPB, RC22504A000GNK#BB0 delivers best-in-class 64 fs jitter in the smallest 4×4 mm package with integrated crystal drive and OTP-based configuration - making it optimal for high-density 100G/400G PHY clocking where jitter, size, and ease of use are prioritized over channel count or sub-MHz capability.

Availability

RC22504A000GNK#BB0 is available at Aetrix Electronics and suitable for 100G/400G Ethernet PHY reference clocking, OTN OTU3/OTU4 mapper timing, and programmable fiber-optic transceiver modules requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for RC22504A000GNK#BB0 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

Renesas Electronics is a global semiconductor leader delivering high-performance analog, mixed-signal, and embedded processing solutions for automotive, industrial, and communications infrastructure markets.

RC22504A000GNK#BB0 belongs to the FemtoClock®2 family - engineered specifically for ultra-low-jitter timing in next-generation optical transport, high-speed switching, and coherent networking applications where sub-100fs phase noise is mandatory.

FAQ

What is the maximum output frequency supported by RC22504A000GNK#BB0?

The RC22504A000GNK#BB0 supports differential output frequencies up to 1 GHz and LVCMOS outputs up to 180 MHz. This range covers key standards including 156.25 MHz (10G Ethernet), 312.5 MHz (25G), 625 MHz (50G), and 1.25 GHz (100G PAM4 baseband), with all outputs derived from its ultra-low-jitter APLL core. The RC22504A000GNK#BB0 achieves this while maintaining ≤64 fs RMS jitter (10 kHz–20 MHz).

Does RC22504A000GNK#BB0 require an external crystal or can it accept an external clock?

Yes, RC22504A000GNK#BB0 supports both configurations: it can drive a 25–80 MHz fundamental-mode crystal directly via XTAL/XO pins, or accept a single-ended or differential external clock (e.g., LVDS, LVPECL) on CLKIN/nCLKIN. The internal crystal oscillator is disabled automatically when external reference is detected - allowing flexible timing source selection without hardware changes. This dual-input capability is documented in Section 6.3 and Figure 13 of the RC22504A000GNK#BB0 datasheet.

How many output formats does RC22504A000GNK#BB0 support per channel?

The RC22504A000GNK#BB0 supports HCSL (DC-coupled), LVDS/LVPECL/CML (AC-coupled), and LVCMOS output formats - with two LVCMOS outputs available simultaneously. Each of the four differential outputs (OUT0–OUT3) can be independently configured for format, amplitude (400–800 mV), and termination type via register settings. This eliminates need for external level translators and simplifies layout for multi-protocol systems. Configuration is detailed in Section 6.5.2 and Register Map 8.9.x of the RC22504A000GNK#BB0 datasheet.

Can RC22504A000GNK#BB0 operate as a digitally controlled oscillator (DCO)?

Yes, RC22504A000GNK#BB0 operates in DCO mode with tuning granularity finer than 1 ppb, enabling precise frequency margining and OTN clock alignment tasks. In DCO mode, the APLL's feedback divider is dynamically adjusted via SPI/I²C to achieve fine frequency steps without changing the reference input. This capability is explicitly specified in Section 5.1.1 and Table 10 (PLL Characteristics) of the RC22504A000GNK#BB0 datasheet, and is essential for OTU3/OTU4 mapper applications.

What packaging and thermal characteristics apply to RC22504A000GNK#BB0?

RC22504A000GNK#BB0 uses a 4 mm × 4 mm, 24-pin QFN package with exposed thermal pad (Renesas package code GNK). Thermal resistance θ_JA is 36°C/W under standard JEDEC 2S2P conditions, and the device supports operation from –40°C to +85°C ambient. The exposed pad must be soldered to a solid thermal plane for reliable performance at full output loading. Full mechanical and thermal data appear in Sections 9–10 of the RC22504A000GNK#BB0 datasheet (R31DS0043EU0112 Rev.1.12).

RC22504A000GNK#BB0 Specifications

Product attributes: Attribute value

Manufacturer:: Renesas

Series:: FemtoClock®

Package/Case:: 24-WFQFN Exposed Pad

Packaging:: Tray

Product Status:: Active

Programmable:: Not Verified

Type:: Frequency Synthesizer

PLL:: Yes

Input:: Clock, Crystal

Output:: CML, HCSL, LVCMOS, LVDS, LVPECL

Number of Circuits:: 1

Ratio - Input:Output:: 2:5

Differential - Input:Output:: Yes/Yes

Frequency - Max:: 180MHz, 1GHz

Divider/Multiplier:: Yes/No

Voltage - Supply:: 1.71V ~ 1.89V, 3.465V

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

Mounting Type:: Surface Mount

Grade:: -

Qualification:: -

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

RC22504A000GNK#BB0 FAQ

1.How can I place an order for RC22504A000GNK#BB0 through Aetrix?

Please submit a Request for Quotation (RFQ) for RC22504A000GNK#BB0 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 RC22504A000GNK#BB0 reliable?

The price and inventory of RC22504A000GNK#BB0 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for RC22504A000GNK#BB0 is usually 5 days.

3.What payment methods are accepted for RC22504A000GNK#BB0?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for RC22504A000GNK#BB0 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for RC22504A000GNK#BB0?

RC22504A000GNK#BB0 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your RC22504A000GNK#BB0 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 RC22504A000GNK#BB0?

For technical support, including RC22504A000GNK#BB0 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your RC22504A000GNK#BB0 requirements.

6.How does Aetrix verify that RC22504A000GNK#BB0 is sourced from the original manufacturer or authorized distributors?

All RC22504A000GNK#BB0 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 RC22504A000GNK#BB0 meets industry standards.

7.What is the process for return or replacement of RC22504A000GNK#BB0?

All RC22504A000GNK#BB0 units undergo pre-shipment inspection (PSI). If there is an issue with RC22504A000GNK#BB0, 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 RC22504A000GNK#BB0 part is unused and in its original packaging.

Return procedure for RC22504A000GNK#BB0:

1.Submit a request within 90 days.

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

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