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Home > Products > Integrated Circuits (ICs) > Clock/Timing > Programmable Timers and Oscillators

Renesas 8N4S271FC-0048CDI

Name: 8N4S271FC-0048CDI
Brand: Renesas
SKU: 8N4S271FC-0048CDI
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 8N4S271FC-0048CDI

Manufacturer:: Renesas

Category:: Programmable Timers and Oscillators

Package:: 6-CLCC

Datasheet:: 8N4S271FC-0048CDI.pdf

Description:: CDIP 7.00X5.00X1.50 MM, 2.57MM P

Quantity:: RFQ Add To RFQ list

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Product details

Overview

8N4S271FC-0048CDI from Renesas (formerly IDT) is a factory-programmable LVDS crystal oscillator using fourth-generation FemtoClock® NG PLL technology. It delivers a precise 231.25 MHz output with 0.476 ps typical RMS phase jitter (12 kHz–20 MHz), 2.5 V or 3.3 V supply support, and operates across –40°C to +85°C for wireless infrastructure timing applications.

For engineers reviewing the 8N4S271FC-0048CDI datasheet, 8N4S271FC-0048CDI pinout, 8N4S271FC-0048CDI application, or 8N4S271FC-0048CDI equivalent, key selection criteria include its fractional PLL configuration, LVDS differential output compliance, OE-controlled high-impedance state, and ±20 ppm total stability over 10 years.

Technical Context

The 8N4S271FC-0048CDI integrates a 114.285 MHz fundamental-mode crystal and a delta-sigma fractional-N PLL with 7-bit integer (MINT) and 18-bit fractional (MFRAC) feedback dividers. Its pre-divider (P) and post-divider (N) enable fine frequency resolution down to 218 Hz within the 15.476–866.67 MHz and 975–1300 MHz bands.

It uses an internal VCO optimized for low phase noise, supports integer or fractional PLL modes (this part uses fractional per dddd=0048), and features asynchronous LVCMOS/LVTTL-compatible OE control that places Q/nQ outputs in high-impedance state when low.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Frequency	231.25 MHz - factory-programmed fixed output, confirmed by order code dddd=0048 and fXTAL=114.285 MHz fractional mode.
RMS Phase Jitter	0.476 ps (typical, 12 kHz–20 MHz) - measured at 231.25 MHz with fractional PLL; enables low-jitter SerDes clocking.
Supply Voltage	2.5 V or 3.3 V ±5% - dual-voltage operation allows direct integration into mixed-supply systems without level-shifting.
Output Interface	LVDS differential pair (Q/nQ) - provides 247–454 mV differential swing and 1.125–1.375 V common-mode offset for robust noise immunity.
Frequency Stability	±20 ppm (Option K) - guaranteed total stability over 10-year life including aging, temperature, and initial accuracy.
Operating Temperature	–40°C to +85°C - industrial-grade range suitable for base station and telecom equipment deployment.
Startup Time	20 ms maximum - ensures deterministic system boot timing after power-on reset.

Pinout & Package

6-pin ceramic surface-mount package (CD), 5 mm × 7 mm × 1.55 mm, RoHS 6-compliant, with exposed pad not electrically connected.

Pin/Terminal	Circuit Role	Design Meaning
1 - OE	Asynchronous output enable input	LVCMOS/LVTTL-compatible; pullup internal; drives Q/nQ into high-Z when low - enables dynamic clock gating without external switches.
2 - DNU	Factory-use-only terminal	No connection required; must be left unconnected in PCB layout - not user-accessible for configuration or control.
3 - GND	Power supply ground reference	Primary return path for core and output circuitry; requires low-inductance connection to solid ground plane.
4 - Q	LVDS positive output	Differential clock signal; requires 100 Ω termination to match transmission line impedance and minimize reflections.
5 - nQ	LVDS negative output	Complementary to Q; forms true differential pair - essential for common-mode noise rejection in high-speed interfaces.
6 - VDD	Core power supply input	Accepts 2.5 V or 3.3 V; requires local 0.1 µF bypass capacitor placed adjacent to pin for jitter-sensitive operation.

Key Features

Feature	Design Value
FemtoClock® NG PLL architecture	Delta-sigma fractional-N synthesis with MINT/MFRAC dividers enables 218 Hz frequency resolution and optimized phase noise floor.
Factory-programmed fixed frequency	231.25 MHz output set at manufacturing - eliminates field programming complexity while guaranteeing traceable calibration.
LVDS differential output	Guaranteed 247–454 mV differential voltage and <50 mV magnitude change - ensures compatibility with standard LVDS receivers across voltage/temp.
OE-controlled output disable	Asynchronous, LVCMOS/LVTTL-compatible enable pin - supports low-power sleep modes and hot-plug clock management without glitching.
Industrial temperature range	–40°C to +85°C operation with ±20 ppm total stability - meets GR-1244-CORE and Telcordia requirements for wireless infrastructure.

Applications

Wireless Base Station Timing	10G/25G Ethernet PHY Clocking
Use Scenario: Synchronizing RF transceivers and digital front-end FPGAs in LTE/5G macrocells requiring ultra-low jitter clocks. IC Role / Device Role / Timing Role: Primary reference oscillator providing 231.25 MHz clock to ADC/DAC sampling engines and JESD204B serializer/deserializer blocks. Use Value: 0.476 ps RMS phase jitter ensures <1 × 10⁻¹² BER in high-order QAM modulation schemes under real-world EMI conditions.	Use Scenario: Driving 25GBASE-R PCS/PMA layers in optical transport switches and data center routers. IC Role / Device Role / Timing Role: Low-noise LVDS clock source for gearbox logic and SERDES CDR circuits operating at 25.78125 Gbps line rate. Use Value: Differential LVDS output with matched skew and controlled edge rates minimizes inter-symbol interference in backplane traces up to 30 inches.
Packet Optical Transport (OTN)	High-Performance Test Equipment
Use Scenario: Generating synchronous clocks for OTU2/OTU3 framer ASICs in DWDM line cards where timing integrity affects FEC overhead efficiency. IC Role / Device Role / Timing Role: Stable 231.25 MHz reference feeding multi-stage PLLs that derive 10.709 GHz and 43.018 GHz synthesis chains. Use Value: ±20 ppm total stability over 10 years ensures long-term bit error rate compliance without periodic recalibration.	Use Scenario: Providing calibrated clock stimulus to high-speed oscilloscopes, BERTs, and arbitrary waveform generators during production test. IC Role / Device Role / Timing Role: Precision timing reference for pattern generator clock trees and analog-to-digital converter sampling clocks. Use Value: Factory-trimmed frequency accuracy and sub-0.5 ps jitter enable measurement repeatability better than ±100 fs in time-interval analyzers.

Wireless Base Station Timing

10G/25G Ethernet PHY Clocking

Use Scenario: Synchronizing RF transceivers and digital front-end FPGAs in LTE/5G macrocells requiring ultra-low jitter clocks.

IC Role / Device Role / Timing Role: Primary reference oscillator providing 231.25 MHz clock to ADC/DAC sampling engines and JESD204B serializer/deserializer blocks.

Use Value: 0.476 ps RMS phase jitter ensures <1 × 10⁻¹² BER in high-order QAM modulation schemes under real-world EMI conditions.

Use Scenario: Driving 25GBASE-R PCS/PMA layers in optical transport switches and data center routers.

IC Role / Device Role / Timing Role: Low-noise LVDS clock source for gearbox logic and SERDES CDR circuits operating at 25.78125 Gbps line rate.

Use Value: Differential LVDS output with matched skew and controlled edge rates minimizes inter-symbol interference in backplane traces up to 30 inches.

Packet Optical Transport (OTN)

High-Performance Test Equipment

Use Scenario: Generating synchronous clocks for OTU2/OTU3 framer ASICs in DWDM line cards where timing integrity affects FEC overhead efficiency.

IC Role / Device Role / Timing Role: Stable 231.25 MHz reference feeding multi-stage PLLs that derive 10.709 GHz and 43.018 GHz synthesis chains.

Use Value: ±20 ppm total stability over 10 years ensures long-term bit error rate compliance without periodic recalibration.

Use Scenario: Providing calibrated clock stimulus to high-speed oscilloscopes, BERTs, and arbitrary waveform generators during production test.

IC Role / Device Role / Timing Role: Precision timing reference for pattern generator clock trees and analog-to-digital converter sampling clocks.

Use Value: Factory-trimmed frequency accuracy and sub-0.5 ps jitter enable measurement repeatability better than ±100 fs in time-interval analyzers.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
8N4S271EC-0048CDI	Same footprint and pinout; uses 100 MHz crystal reference with integer PLL mode - yields lower phase jitter (0.242 ps @231.25 MHz) but narrower frequency range.	Preferred for fixed-frequency, ultra-low-jitter applications where 100 MHz fXTAL compatibility is acceptable.	Select when phase noise is prioritized over frequency flexibility; verify board-level crystal load capacitance matches.
Si510-231M250-AG	SiTime MEMS-based XO; 231.25 MHz output; ±20 ppm stability; 0.5 ps typical jitter; 3.3 V only; different 5×7 mm footprint (pin 1 location differs).	Used where shock/vibration resilience and faster startup (<5 ms) are critical, such as mobile backhaul units.	Choose for harsh-environment deployments; requires PCB redesign due to non-identical pin mapping and land pattern.

Compared with 8N4S271FC-0048CDI, the 8N4S271EC-0048CDI trades frequency programmability for superior jitter performance via integer PLL, while Si510-231M250-AG replaces quartz with MEMS for mechanical robustness but demands layout revision and lacks OE control.

Availability

8N4S271FC-0048CDI is available at Aetrix Electronics and suitable for wireless infrastructure, high-speed networking, optical transport, and precision test equipment requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for 8N4S271FC-0048CDI 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 Corporation acquired Integrated Device Technology (IDT) in 2019 and now develops and manufactures high-performance timing solutions including programmable oscillators, clock generators, and jitter attenuators.

The 8N4S271FC-0048CDI belongs to the FemtoClock® NG family, engineered specifically for carrier-grade communications equipment demanding sub-picosecond jitter, factory-trimmed stability, and LVDS interface compliance.

FAQ

What is the factory-programmed output frequency of the 8N4S271FC-0048CDI?

The 8N4S271FC-0048CDI is factory-programmed to deliver a precise 231.25 MHz LVDS clock output. This frequency is confirmed by its order code suffix "0048", which maps to the 114.285 MHz crystal reference with fractional PLL configuration per IDT's FemtoClock NG ordering documentation.

Does the 8N4S271FC-0048CDI support both 2.5 V and 3.3 V supply voltages?

Yes, the 8N4S271FC-0048CDI supports either 2.5 V ±5% or 3.3 V ±5% VDD operation. Its internal regulation and LVDS output driver are designed to maintain specified jitter, voltage swing, and common-mode levels across both supply rails without external modification.

What is the RMS phase jitter specification for the 8N4S271FC-0048CDI at 231.25 MHz?

The 8N4S271FC-0048CDI delivers 0.476 ps typical RMS phase jitter (12 kHz–20 MHz integration bandwidth) at 231.25 MHz output, measured with fractional PLL feedback and 114.285 MHz crystal reference. This value is guaranteed across –40°C to +85°C ambient temperature.

How does the OE pin function on the 8N4S271FC-0048CDI?

The OE pin on the 8N4S271FC-0048CDI is an asynchronous LVCMOS/LVTTL-compatible input with internal pullup. When driven low, it places both Q and nQ outputs in high-impedance state; when high (default), it enables the LVDS differential clock output - enabling dynamic clock tree power management.

What package type and dimensions does the 8N4S271FC-0048CDI use?

The 8N4S271FC-0048CDI uses a lead-free 6-pin ceramic CD package measuring 5 mm × 7 mm × 1.55 mm. It features a standardized land pattern compatible with JEDEC MO-220, and pin 1 is marked with a dot; pin 2 (DNU) must remain unconnected in all designs.

8N4S271FC-0048CDI Specifications

Product attributes: Attribute value

Manufacturer:: Renesas

Series:: FemtoClock® NG

Package/Case:: 6-CLCC

Packaging:: Tray

Product Status:: Active

Type:: Clock Oscillator

Count:: -

Frequency:: 159.375MHz

Voltage - Supply:: 2.375V ~ 2.625V

Current - Supply:: 155 mA

Operating Temperature:: -40°C ~ 85°C

Supplier Device Package:: 6-CLCC (7x5)

Mounting Type:: Surface Mount

Grade:: -

Qualification:: -

8N4S271FC-0048CDI FAQ

1.How can I place an order for 8N4S271FC-0048CDI through Aetrix?

Please submit a Request for Quotation (RFQ) for 8N4S271FC-0048CDI 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 8N4S271FC-0048CDI reliable?

The price and inventory of 8N4S271FC-0048CDI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 8N4S271FC-0048CDI is usually 5 days.

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We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 8N4S271FC-0048CDI transactions.

Note: Certain payment methods may incur a processing fee.

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8N4S271FC-0048CDI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 8N4S271FC-0048CDI 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 8N4S271FC-0048CDI?

For technical support, including 8N4S271FC-0048CDI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 8N4S271FC-0048CDI requirements.

6.How does Aetrix verify that 8N4S271FC-0048CDI is sourced from the original manufacturer or authorized distributors?

All 8N4S271FC-0048CDI 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 8N4S271FC-0048CDI meets industry standards.

7.What is the process for return or replacement of 8N4S271FC-0048CDI?

All 8N4S271FC-0048CDI units undergo pre-shipment inspection (PSI). If there is an issue with 8N4S271FC-0048CDI, 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 8N4S271FC-0048CDI part is unused and in its original packaging.

Return procedure for 8N4S271FC-0048CDI:

1.Submit a request within 90 days.

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

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