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

Renesas RC21012B000GNA#KB0

Name: RC21012B000GNA#KB0
Brand: Renesas
SKU: RC21012B000GNA#KB0
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: RC21012B000GNA#KB0

Manufacturer:: Renesas

Category:: Clock Generators, PLLs, Frequency Synthesizers

Package:: 48-VFQFN Exposed Pad

Datasheet:: RC21012B000GNA#KB0.pdf

Description:: IC CLOCK JITTER PCIE 48VFQFPN

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Product details

Overview

RC21012B000GNA#KB0 from Renesas Electronics is a seventh-generation programmable clock generator with 12 differential output pairs, 169fs RMS phase jitter at 156.25MHz, PCIe Gen7 Common Clock compliance (8fs RMS), and support for LVCMOS (1kHz–200MHz), LVDS/LP-HCSL (1kHz–650MHz) outputs. It serves as a high-precision timing source in data center accelerators and enterprise storage systems.

For engineers reviewing the RC21012B000GNA#KB0 datasheet, RC21012B000GNA#KB0 pinout, RC21012B000GNA#KB0 application, or RC21012B000GNA#KB0 equivalent, key selection criteria include PCIe Gen7 jitter performance, integrated crystal option, OTP-configurable output banks, and 400kHz I²C / 20MHz SPI programming interface compatibility.

Technical Context

The RC21012B000GNA#KB0 implements an advanced APLL architecture with fractional and integer output dividers, enabling precise frequency synthesis across 12 independently configurable output banks. It supports SRIS and SRNS modes for PCIe Gen7 reference clock distribution.

Its input stage accepts crystal/oscillator reference inputs (XIN_REFIN/XOUT_REFINb) or dual differential clock inputs (CLKIN0/CLKIN0b, CLKIN1/CLKIN1b), with programmable input buffer logic per protocol. Output drivers include LP-HCSL with integrated 85Ω/100Ω terminations and AC-coupling capability for LVPECL/CML interfaces.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Count	12 differential output pairs (24 pins), supporting independent voltage domains per bank.
Phase Jitter (156.25MHz)	169fs RMS typical - meets stringent compute and datacom timing margin requirements.
PCIe Gen7 Refclk Jitter	8fs RMS typical - compliant with PCIe Gen7 Common Clock specification for switch/router PHYs.
Output Frequency Range	LVCMOS: 1kHz–200MHz; LVDS/LP-HCSL: 1kHz–650MHz - covers CPU, memory, SerDes, and FPGA clocks.
Configuration Interface	I²C/SMBus (400kHz) or SPI (20MHz); factory OTP holds up to four full or 27 partial configurations.
Operating Voltage	1.8V/2.5V/3.3V VDDO per output bank; VDDA/VDDR/VDDD/VDDX each rated for same voltages - enables mixed-signal system integration.
Temperature Range	–40°C to +85°C - qualified for industrial and enterprise infrastructure environments.

Pinout & Package

RC21012B000GNA#KB0 uses a 6×6 mm 48-pin QFN package with exposed thermal pad (VFQFPN ePad). The variant includes integrated crystal option (denoted by "KB0" suffix), eliminating external XTAL placement and reducing board area.

Pin/Terminal	Circuit Role	Design Meaning
VDDA, VDDR, VDDD, VDDX, VDDO0–VDDO6	Analog, receiver, digital core, crystal, and 7 output bank power supplies	Independent voltage domains allow mixed-voltage clock fanout (e.g., 1.8V SerDes + 3.3V control logic).
XIN_REFIN / XOUT_REFINb	Crytal oscillator input / output or differential reference clock pair	Supports integrated crystal (Q-version) or external XO; XOUT_REFINb floats when using external oscillator.
CLKIN0_GPI0 / CLKIN0b_GPI1 CLKIN1_GPI2 / CLKIN1b_GPI3	Dual differential clock inputs or general-purpose inputs (GPI0–GPI3)	Configurable as clock sources or status/control signals; internal termination enables direct connection to LVDS/LVPECL sources.
OUT0–OUT11 / OUT0b–OUT11b	Differential clock outputs (12 pairs)	Each pair assigned to one of 7 output banks; supports LVCMOS, LVDS, or LP-HCSL with programmable drive strength and termination.
SCL_SCLK / SDA_nCS	I²C clock/data or SPI clock/chip-select	3.3V-tolerant interface; enables in-system configuration without level-shifting in mixed-voltage designs.
GPIO0–GPIO4	General-purpose I/Os	3-level logic during power-up for boot-state detection; configurable as inputs, outputs, or open-drain with pull-up/down options.

Key Features

Feature	Design Value
PCIe Gen7 Common Clock compliance	8fs RMS jitter enables direct use as reference clock for Gen7 switches/routers without external jitter cleaners.
Integrated crystal option (KB0)	Eliminates external crystal and load capacitors; reduces BOM count and layout complexity for space-constrained systems.
LP-HCSL with on-die 85Ω/100Ω termination	Direct interface to PCIe slots and ASICs without external resistors - improves signal integrity and simplifies routing.
OTP storage for 4 full or 27 partial configs	Enables field-programmable multi-platform support (e.g., server, accelerator, storage) from single hardware design.
Programmable input buffer per protocol	Automatic adaptation to LVDS, LVPECL, CML, or CMOS inputs via register settings - avoids manual resistor networks.

Applications

High-Performance Computing	Data Center Accelerators
Use Scenario: Multi-socket CPU platform requiring synchronized low-jitter clocks for memory controllers, PCIe root complexes, and interconnect fabric. IC Role / Device Role / Timing Role: Primary programmable clock generator distributing 156.25MHz PCIe Gen7 reference, 266MHz DDR5 memory clocks, and 1GHz CPU core clocks. Use Value: 169fs RMS phase jitter ensures setup/hold margin for DDR5 PHYs; 12 output pairs eliminate need for cascaded fanout buffers.	Use Scenario: AI inference accelerator card with FPGA, HBM2E memory, and 400G Ethernet MACs needing multiple synchronous clock domains. IC Role / Device Role / Timing Role: Central timing hub generating 320MHz HBM2E clock, 100MHz Ethernet reference, and 125MHz FPGA logic clocks. Use Value: Independent VDDO banks allow 1.2V HBM2E outputs and 3.3V management interface clocks from single device.
Enterprise Storage	Switches and Routers
Use Scenario: NVMe-oF storage controller with dual 16-lane PCIe Gen5 hosts, SAS/SATA bridges, and RAID processors. IC Role / Device Role / Timing Role: Fanout clock source providing 100MHz PCIe Gen5 reference, 50MHz SAS, and 25MHz management clocks. Use Value: SRIS/SRNS support enables active power management in PCIe links without clock interruption.	Use Scenario: 32-port 400G Ethernet switch ASIC requiring ultra-low-jitter reference clocks for SerDes lanes and packet processing subsystems. IC Role / Device Role / Timing Role: PCIe Gen7-compliant clock generator delivering 100MHz reference to switch fabric and 156.25MHz to line cards. Use Value: 8fs RMS jitter meets IEEE 802.3ck PMA spec for 400G-ZR optical modules and switch PHYs.

High-Performance Computing

Data Center Accelerators

Use Scenario: Multi-socket CPU platform requiring synchronized low-jitter clocks for memory controllers, PCIe root complexes, and interconnect fabric.

IC Role / Device Role / Timing Role: Primary programmable clock generator distributing 156.25MHz PCIe Gen7 reference, 266MHz DDR5 memory clocks, and 1GHz CPU core clocks.

Use Value: 169fs RMS phase jitter ensures setup/hold margin for DDR5 PHYs; 12 output pairs eliminate need for cascaded fanout buffers.

Use Scenario: AI inference accelerator card with FPGA, HBM2E memory, and 400G Ethernet MACs needing multiple synchronous clock domains.

IC Role / Device Role / Timing Role: Central timing hub generating 320MHz HBM2E clock, 100MHz Ethernet reference, and 125MHz FPGA logic clocks.

Use Value: Independent VDDO banks allow 1.2V HBM2E outputs and 3.3V management interface clocks from single device.

Enterprise Storage

Switches and Routers

Use Scenario: NVMe-oF storage controller with dual 16-lane PCIe Gen5 hosts, SAS/SATA bridges, and RAID processors.

IC Role / Device Role / Timing Role: Fanout clock source providing 100MHz PCIe Gen5 reference, 50MHz SAS, and 25MHz management clocks.

Use Value: SRIS/SRNS support enables active power management in PCIe links without clock interruption.

Use Scenario: 32-port 400G Ethernet switch ASIC requiring ultra-low-jitter reference clocks for SerDes lanes and packet processing subsystems.

IC Role / Device Role / Timing Role: PCIe Gen7-compliant clock generator delivering 100MHz reference to switch fabric and 156.25MHz to line cards.

Use Value: 8fs RMS jitter meets IEEE 802.3ck PMA spec for 400G-ZR optical modules and switch PHYs.

Equivalent & Alternatives

The following parts are listed as comparable options for similar programmable clock generator applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
Si5341-B-GM	10-output, 190fs jitter at 156.25MHz; no integrated crystal; requires external XTAL and EEPROM.	Targeted at telecom timing; lacks PCIe Gen7 Common Clock certification and SRIS/SRNS support.	Preferred where legacy Si534x toolchain and JEDEC JESD204B focus outweigh PCIe Gen7 requirements.
ICS8430-01T	8-output, 220fs jitter at 156.25MHz; LVDS-only outputs; no I²C/SPI configuration; fixed-frequency operation.	Designed for cost-sensitive networking PHYs; no programmability or multi-protocol output support.	Select when fixed-frequency LVDS fanout suffices and configuration flexibility is unnecessary.

Compared with Si5341-B-GM and ICS8430-01T, RC21012B000GNA#KB0 delivers lower jitter, PCIe Gen7 compliance, integrated crystal, and 12-output flexibility-making it optimal for next-gen data center timing where configurability, density, and specification adherence are critical.

Availability

RC21012B000GNA#KB0 is available at Aetrix Electronics and suitable for high-performance computing, data center accelerators, and enterprise storage applications requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for RC21012B000GNA#KB0 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 specializing in microcontrollers, analog, power, and timing solutions for automotive, industrial, and data infrastructure markets.

The RC210xxB VersaClock 7 family targets high-speed compute and datacom systems demanding PCIe Gen7-compliant jitter performance, flexible output configurations, and integrated crystal options to reduce system-level timing complexity.

FAQ

What is the primary function of the RC21012B000GNA#KB0 in a data center switch design?

The RC21012B000GNA#KB0 serves as the central programmable clock generator, delivering ultra-low-jitter PCIe Gen7 reference clocks (e.g., 100MHz, 156.25MHz) to switch ASICs and line cards. Its 12 differential output pairs, SRIS/SRNS support, and 8fs RMS jitter ensure compliance with IEEE 802.3ck and PCIe Gen7 specifications while enabling flexible clock domain partitioning across fabric, control, and I/O subsystems.

Does the RC21012B000GNA#KB0 require an external crystal, or does it include one?

The RC21012B000GNA#KB0 includes an integrated crystal (denoted by "KB0" suffix), eliminating the need for an external crystal or load capacitors. This reduces PCB footprint, BOM count, and layout sensitivity compared to versions requiring external XTAL, while maintaining the same 169fs RMS phase jitter performance at 156.25MHz.

How many independent power domains does the RC21012B000GNA#KB0 support for its outputs?

The RC21012B000GNA#KB0 supports seven independent output power domains (VDDO0–VDDO6), each assignable to one of the 12 differential output pairs. This allows simultaneous generation of clocks at different voltage levels (1.8V, 2.5V, 3.3V) - for example, 1.8V LP-HCSL for PCIe slots and 3.3V LVCMOS for management microcontrollers - without external level shifters.

Can the RC21012B000GNA#KB0 be configured via I²C after soldering to the PCB?

Yes, the RC21012B000GNA#KB0 supports in-system configuration via its 3.3V-tolerant I²C interface (SCL_SCLK/SDA_nCS pins) operating up to 400kHz. Configuration can be performed post-assembly using host processor firmware or dedicated programming tools, leveraging either factory-programmed OTP or external I²C EEPROM for persistent settings.

What is the significance of the "B" suffix in RC21012B000GNA#KB0?

Within the RC210xxB family, the "B" suffix denotes the seventh-generation VersaClock architecture featuring enhanced PCIe Gen7 jitter performance (8fs RMS), SRIS/SRNS support, expanded output count (12 pairs), and updated OTP programming structure. It distinguishes this generation from earlier RC210xxA devices, which lack Gen7 compliance and integrated crystal options.

RC21012B000GNA#KB0 Specifications

Product attributes: Attribute value

Manufacturer:: Renesas

Series:: VersaClock® 7

Package/Case:: 48-VFQFN Exposed Pad

Packaging:: Tape & Reel (TR)

Product Status:: Active

Programmable:: -

Type:: Clock Generator

PLL:: Yes

Input:: CML, HCSL, LVCMOS, LVDS, LVPECL, Crystal

Output:: LP-HCSL, LVCMOS, LVDS

Number of Circuits:: 1

Ratio - Input:Output:: 3:12

Differential - Input:Output:: Yes/Yes

Frequency - Max:: 200MHz, 650MHz

Divider/Multiplier:: Yes/No

Voltage - Supply:: 1.71V ~ 1.89V, 2.375V ~ 2.625V, 3.135V ~ 3.465V

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

Mounting Type:: Surface Mount

Grade:: -

Qualification:: -

Supplier Device Package:: 48-VFQFPN (6x6)

RC21012B000GNA#KB0 FAQ

1.How can I place an order for RC21012B000GNA#KB0 through Aetrix?

Please submit a Request for Quotation (RFQ) for RC21012B000GNA#KB0 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 RC21012B000GNA#KB0 reliable?

The price and inventory of RC21012B000GNA#KB0 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for RC21012B000GNA#KB0 is usually 5 days.

3.What payment methods are accepted for RC21012B000GNA#KB0?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for RC21012B000GNA#KB0 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for RC21012B000GNA#KB0?

RC21012B000GNA#KB0 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your RC21012B000GNA#KB0 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 RC21012B000GNA#KB0?

For technical support, including RC21012B000GNA#KB0 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your RC21012B000GNA#KB0 requirements.

6.How does Aetrix verify that RC21012B000GNA#KB0 is sourced from the original manufacturer or authorized distributors?

All RC21012B000GNA#KB0 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 RC21012B000GNA#KB0 meets industry standards.

7.What is the process for return or replacement of RC21012B000GNA#KB0?

All RC21012B000GNA#KB0 units undergo pre-shipment inspection (PSI). If there is an issue with RC21012B000GNA#KB0, 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 RC21012B000GNA#KB0 part is unused and in its original packaging.

Return procedure for RC21012B000GNA#KB0:

1.Submit a request within 90 days.

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

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