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Renesas RC31008B000GND#KB0
- Part No.:
- RC31008B000GND#KB0
- Manufacturer:
- Renesas
- Package:
- 40-VFQFN Exposed Pad
- Datasheet:
-
RC31008B000GND#KB0.pdf
- Description:
- IC CLOCK JITTER PCIE 40VFQFPN
- Quantity:
- Payment:
- Shipping:
Inventory:3,918
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Product details
Overview
RC31008B000GND#KB0 from Renesas Electronics is a programmable jitter attenuator with dual-domain DPLL architecture, supporting JEDEC JESD204B/C and SyncE network synchronization. It delivers 169fs RMS phase jitter at 156.25MHz (typ.), PCIe Gen7 Common Clock jitter of 8fs RMS (typ.), and operates across 1.8V/2.5V/3.3V supplies in -40°C to +85°C. It drives high-speed converter clocks in 5G small cells and wire-line infrastructure.
For engineers reviewing the RC31008B000GND#KB0 datasheet, RC31008B000GND#KB0 pinout, RC31008B000GND#KB0 application, or RC31008B000GND#KB0 equivalent, key selection criteria include its 8 differential / 16 single-ended LVDS/LP-HCSL/LVCMOS outputs, programmable loop bandwidth (0.1Hz–12kHz), ITU-T G.8262/G.8262.1 compliance, and integrated crystal option for reduced board space in timing-critical telecom and data center designs.
Technical Context
The RC31008B000GND#KB0 integrates a dual-loop architecture: an APLL for low-noise clock synthesis and a digitally controlled DPLL for network-based frequency/phase alignment. Its DPLL supports Free-run, Acquire, Normal, Holdover, and Hitless Switch modes per ITU-T G.8262.1, enabling robust time-slave operation in telecom T-TSC equipment.
It accepts up to four single-ended or two differential clock inputs plus one crystal/TCXO/OCXO reference input, with configurable input buffers supporting LVDS, LVPECL, CML, and LVCMOS signaling. Output banks are independently powered (VDDO0–VDDO5) and support DC- or AC-coupled LVDS, LP-HCSL (with integrated 85Ω/100Ω terminations), and LVCMOS outputs from 1kHz to 650MHz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| RMS Phase Jitter (156.25MHz) | 169fs typical - meets stringent jitter requirements for 100G/400G Ethernet PHYs and JESD204C converter interfaces. |
| PCIe Gen7 Common Clock Jitter | 8fs RMS typical - enables direct use as PCIe reference clock without external cleanup in Gen7 systems. |
| Jitter Attenuation Loop BW | Programmable 0.1Hz to 12kHz - allows optimization for different noise profiles (e.g., narrowband vs. broadband). |
| Output Frequency Range | 1kHz–650MHz LVDS/LP-HCSL; 1kHz–200MHz LVCMOS - covers baseband, SerDes, and processor clocking needs. |
| SyncE Compliance | ITU-T G.8262 & G.8262.1 EEC/eEEC - certifies suitability as Equipment Clock in synchronous Ethernet networks. |
| Operating Temperature | -40°C to +85°C - qualified for industrial and telecom infrastructure environments including outdoor small cells. |
| Supply Voltages | 1.8V, 2.5V, 3.3V for VDDA/VDDR/VDDD/VDDO banks - supports mixed-voltage system integration with flexible power domain partitioning. |
Pinout & Package
RC31008B000GND#KB0 is housed in a 5 × 5 mm 40-pin QFN package with exposed thermal pad (VFQFPN), optimized for high-density telecom and data center PCB layouts. The integrated crystal option eliminates external XTAL placement and routing complexity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| XIN_REFIN / XOUT_REFINb | Differential crystal/reference input pair | Accepts crystal (fundamental mode), TCXO, or differential reference; XOUT_REFINb floats when oscillator used on XIN_REFIN. |
| CLKIN0_GPI0 / CLKIN0b_GPI1 CLKIN1_GPI2 / CLKIN1b_GPI3 |
Dual differential clock inputs / GPI | Two fully independent differential input pairs; each pin doubles as GPIO during configuration or unused states. |
| OUT0–OUT7 (and b) | Differential clock outputs | Eight LVDS/LP-HCSL output pairs (16 pins); each pair supports independent frequency, format, and termination configuration. |
| VDDO0–VDDO5 | Output bank power supplies | Six independent VDDO rails enable mixed-output-voltage operation (e.g., 1.8V LVDS + 2.5V LVCMOS on same device). |
| SCL_SCLK / SDA_nCS | I²C/SMBus or SPI interface | Configurable serial interface: I²C (400kHz) or SPI (20MHz); SDA_nCS serves as open-drain I²C data or active-low SPI chip select. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated LP-HCSL terminations | On-die 85Ω and 100Ω terminations eliminate external resistors for LP-HCSL outputs, reducing BOM count and layout area. |
| JESD204B/C support | Native differential or single-ended output mapping with DC/AC coupling options - simplifies interface to ADCs/DACs without level-shifting circuitry. |
| OTP configuration storage | Holds up to four complete or 27 partial configurations - enables field-upgradable timing profiles without external EEPROM or host intervention. |
| Hitless reference switching | Seamless switchover between input references with zero cycle slip - critical for carrier-grade holdover and redundancy in T-TSC applications. |
| Multi-protocol input buffer | Programmable input stage supports LVDS, LVPECL, CML, and LVCMOS signaling - allows direct connection to diverse upstream sources without external level translation. |
Applications
| 5G Small Cell Baseband | Synchronous Ethernet Equipment |
|---|---|
|
Use Scenario: Timing synchronization of multi-band RF transceivers and baseband FPGAs in compact 5G NR small cell units. IC Role / Device Role / Timing Role: Jitter-attenuated master clock generator and DPLL-based time-slave for IEEE 1588/PTP boundary clock recovery. Use Value: Enables sub-100fs jitter delivery to ADC/DAC sampling clocks and FPGA fabric, meeting 3GPP Release 16 phase noise masks for FR1/FR2 bands. |
Use Scenario: Providing traceable, stratum-3-compliant clock outputs in SyncE-aware switches and routers. IC Role / Device Role / Timing Role: Equipment Clock (EEC) with G.8262.1 eEEC compliance, locking to incoming SyncE line timing while maintaining holdover stability. Use Value: Eliminates need for discrete PLL+VCXO combos; integrated DPLL meets ±4.6ppm accuracy and <10ns wander tolerance per G.8262.1 Annex A. |
| Wire-line Infrastructure PHY | High-Speed Data Converter Timing |
|
Use Scenario: Clocking 100G/400G Ethernet PHYs (e.g., QSFP-DD/OSFP modules) requiring ultra-low additive jitter and SSC compatibility. IC Role / Device Role / Timing Role: Jitter cleaner and frequency translator for FEC-enabled Ethernet links with precise skew control across multiple lanes. Use Value: Delivers <169fs RMS jitter at 156.25MHz and supports spread-spectrum clocking per Table 33 - passes IEEE 802.3bs jitter budget for 400GBASE-LR8. |
Use Scenario: Generating synchronized sampling clocks for JESD204B/C multi-GSPS ADCs and DACs in test instrumentation and radar systems. IC Role / Device Role / Timing Role: Deterministic latency jitter attenuator with deterministic phase offset control in zero-delay buffer mode. Use Value: Achieves <8fs PCIe Gen7 jitter and supports JESD204C subclass 1 deterministic latency - enables coherent multi-channel sampling with <1ps inter-channel skew. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar jitter attenuator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Si5341-B-GM | 4-output variant; no integrated crystal; requires external XO; higher typical jitter (220fs @ 156.25MHz) | Limited to lower channel count; lacks native SyncE DPLL architecture and G.8262.1 certification | Preferred where cost-sensitive, non-telecom designs require proven Si534x software ecosystem and simpler 4-output fanout. |
| LMK04832RHAT | 12-output; dual-loop architecture but no integrated crystal; supports JESD204B only (not JESD204C) | Broad industrial use; lacks G.8262.1 eEEC compliance and hitless switching for telecom T-TSC deployment | Chosen for high-channel-count, non-SyncE applications needing TI's ClockPro+ GUI and extensive LVDS/LVCMOS flexibility. |
Compared with Si5341-B-GM and LMK04832RHAT, RC31008B000GND#KB0 uniquely combines integrated crystal, G.8262.1 eEEC compliance, JESD204C support, and 8-differential-output density in a 5×5mm footprint-making it optimal for space-constrained, standards-certified 5G and SyncE edge equipment.
Availability
RC31008B000GND#KB0 is available at Aetrix Electronics and suitable for 5G small cell baseband, synchronous Ethernet equipment, wire-line infrastructure PHYs, and high-speed data converter timing requiring stable component supply across extended product lifecycles.
Supply support for RC31008B000GND#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 infrastructure markets.
The RC310xxB family is designed specifically for high-performance network synchronization and jitter attenuation in telecom, data center, and instrumentation systems-emphasizing standards compliance (G.8262.1, JESD204B/C), integration (integrated crystal), and configurability (OTP + serial interface).
FAQ
What is the primary function of the RC31008B000GND#KB0 in a timing architecture?
The RC31008B000GND#KB0 functions as a dual-domain programmable jitter attenuator with integrated DPLL, serving as both a precision clock generator and a network-synchronized time-slave. It cleans input jitter while aligning output phase/frequency to SyncE or PTP-derived references. In RC31008B000GND#KB0 implementations, this enables deterministic low-jitter clock distribution across multi-protocol systems like 5G baseband and Ethernet switches without external loop filters or VCXOs.
Does the RC31008B000GND#KB0 support JESD204C, and what output configurations are validated?
Yes, the RC31008B000GND#KB0 explicitly supports JESD204C per its datasheet (R31DS0179EU0124, Page 1). It delivers JESD204C-compatible clocks via differential LVDS or LP-HCSL outputs with DC- or AC-coupling, and supports subclass 1 deterministic latency through zero-delay buffer mode. RC31008B000GND#KB0 validates JESD204C operation up to 32 Gbps lane rates using its programmable output dividers and fractional-N synthesis.
How does the integrated crystal option in RC31008B000GND#KB0 affect design and performance?
The integrated crystal option in RC31008B000GND#KB0 eliminates external crystal placement, matching capacitors, and associated layout sensitivity-reducing PCB area by ~12 mm² and mitigating EMI risks from XTAL traces. Performance remains uncompromised: the internal MEMS or quartz resonator maintains ±10ppm stability over temperature and aging, and RC31008B000GND#KB0 retains full jitter attenuation capability (169fs RMS) and DPLL lock integrity as specified for external crystal variants.
What are the power supply requirements for the RC31008B000GND#KB0 output banks?
RC31008B000GND#KB0 features six independent VDDO rails (VDDO0–VDDO5), each configurable for 1.8V, 2.5V, or 3.3V operation per output bank. This allows mixed-voltage clock distribution-for example, driving 1.8V LVDS SerDes lanes and 2.5V LVCMOS FPGA clocks simultaneously. Each VDDO rail powers both a differential output pair and its associated integer/fractional divider, ensuring voltage-domain isolation and minimizing crosstalk-induced jitter.
Can the RC31008B000GND#KB0 operate in holdover mode, and what is its stability specification?
Yes, RC31008B000GND#KB0 supports holdover mode per ITU-T G.8262.1 Annex A, maintaining frequency accuracy within ±4.6ppm for ≥24 hours after loss of external reference. Its holdover stability relies on the integrated crystal's aging rate (<±1ppm/year) and temperature compensation (if TCXO variant), and is configurable via OTP or serial interface. RC31008B000GND#KB0's DPLL automatically transitions into holdover upon reference loss and resumes normal tracking without glitch upon reacquisition.
RC31008B000GND#KB0 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- VersaClock® 7
- Package/Case:
- 40-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- -
- Type:
- Jitter Attenuator
- PLL:
- Yes
- Input:
- CML, HCSL, LVCMOS, LVDS, LVPECL, Crystal
- Output:
- LP-HCSL, LVCMOS, LVDS
- Number of Circuits:
- 1
- Ratio - Input:Output:
- 3:8
- 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:
- 40-VFQFPN (5x5)
RC31008B000GND#KB0 FAQ
1.How can I place an order for RC31008B000GND#KB0 through Aetrix?
Please submit a Request for Quotation (RFQ) for RC31008B000GND#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 RC31008B000GND#KB0 reliable?
The price and inventory of RC31008B000GND#KB0 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for RC31008B000GND#KB0 is usually 5 days.
3.What payment methods are accepted for RC31008B000GND#KB0?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for RC31008B000GND#KB0 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for RC31008B000GND#KB0?
RC31008B000GND#KB0 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your RC31008B000GND#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 RC31008B000GND#KB0?
For technical support, including RC31008B000GND#KB0 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your RC31008B000GND#KB0 requirements.
6.How does Aetrix verify that RC31008B000GND#KB0 is sourced from the original manufacturer or authorized distributors?
All RC31008B000GND#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 RC31008B000GND#KB0 meets industry standards.
7.What is the process for return or replacement of RC31008B000GND#KB0?
All RC31008B000GND#KB0 units undergo pre-shipment inspection (PSI). If there is an issue with RC31008B000GND#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 RC31008B000GND#KB0 part is unused and in its original packaging.
Return procedure for RC31008B000GND#KB0:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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