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Renesas 8N4S271FC-0048CDI8
- Part No.:
- 8N4S271FC-0048CDI8
- Manufacturer:
- Renesas
- Category:
- Programmable Timers and Oscillators
- Package:
- 6-CLCC
- Datasheet:
-
8N4S271FC-0048CDI8.pdf
- Description:
- CDIP 7.00X5.00X1.50 MM, 2.57MM P
- Quantity:
- Payment:
- Shipping:
Inventory:3,280
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Product details
Overview
8N4S271FC-0048CDI8 from Renesas Electronics (formerly IDT) is a factory-programmable LVDS crystal oscillator leveraging fourth-generation FemtoClock® NG PLL technology. It delivers a single 2.5V/3.3V LVDS clock output, supports frequency programming from 15.476 MHz to 866.67 MHz and 975 MHz to 1,300 MHz with ≤218 Hz resolution, and operates across –40°C to +85°C for wireless infrastructure timing.
For engineers reviewing the 8N4S271FC-0048CDI8 datasheet, 8N4S271FC-0048CDI8 pinout, 8N4S271FC-0048CDI8 application, or 8N4S271FC-0048CDI8 equivalent, this page provides verified technical context, pin-level design meaning, jitter performance at key frequencies, LVDS termination guidance, and validated alternative XO options for telecom and networking clocking systems.
Technical Context
The 8N4S271FC-0048CDI8 integrates a 3rd-overtone crystal (100 MHz or 114.285 MHz reference), fractional or integer PLL feedback (configurable via order code dddd=0xxx/1xxx/2xxx), and a 1950–2600 MHz VCO. Its P/M/N divider architecture enables high-resolution synthesis with MINT (7-bit) and MFRAC (18-bit) feedback control.
It features asynchronous LVCMOS/LVTTL-compatible OE control (pin 2), differential LVDS outputs (pins 4/Q and 5/nQ), internal pullup on OE, and operates from either 2.5 V or 3.3 V supply (pin 6/VDD) with GND on pin 3 - all in a RoHS-compliant 6-pin ceramic 5 mm × 7 mm × 1.55 mm package.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Type | Single LVDS differential pair (Q/nQ); requires 100 Ω parallel termination at receiver for signal integrity. |
| Frequency Range | 15.476–866.67 MHz and 975–1300 MHz; factory-programmed to exact value - no field tuning. |
| Frequency Resolution | ≤218 Hz; enables precise alignment with SerDes line rates (e.g., 231.25 MHz for CPRI). |
| RMS Phase Jitter (12 kHz–20 MHz) | 0.476–0.680 ps @ 231.25 MHz (integer PLL); meets stringent OC-192/SONET and 10G Ethernet timing budgets. |
| Supply Voltage | 2.5 V ±5% or 3.3 V ±5%; dual-voltage support simplifies integration into mixed-rail systems. |
| Operating Temperature | –40°C to +85°C; qualified for industrial-grade wireless base station and packet-optical transport equipment. |
| Package | RoHS-compliant 6-pin ceramic (5 mm × 7 mm × 1.55 mm); low thermal resistance (θJA = 49.4°C/W) enables stable operation under airflow-limited conditions. |
Pinout & Package
6-pin ceramic package (CD), 5 mm × 7 mm × 1.55 mm, lead-free (RoHS 6). Pin 1 is DNU (factory use only); pin 2 is OE (LVCMOS/LVTTL input with internal 50 kΩ pullup); pins 4 and 5 are complementary LVDS outputs; pin 6 is VDD; pin 3 is GND.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| DNU (1) | Factory test/debug | No user connection; floating or grounded - no effect on operation. |
| OE (2) | Output enable control | Asynchronous active-high; drives Q/nQ into high-Z when low - enables dynamic clock gating without PLL reset. |
| GND (3) | Power ground reference | Must be connected to low-impedance system ground plane; critical for LVDS common-mode stability and jitter suppression. |
| Q (4) | LVDS positive output | Differential pair with nQ; 247–454 mV swing, 1.125–1.375 V common-mode; requires controlled 100 Ω differential trace impedance. |
| nQ (5) | LVDS negative output | Complementary to Q; phase-matched within <50 ps skew - essential for low-jitter clock distribution. |
| VDD (6) | Power supply input | Accepts 2.5 V or 3.3 V; bypassed with 0.1 µF capacitor placed adjacent to pin per layout guidelines to minimize supply-induced jitter. |
Key Features
| Feature | Design Value |
|---|---|
| FemtoClock® NG PLL architecture | Enables sub-0.5 ps RMS phase jitter at 231.25 MHz using integer feedback mode - optimized for deterministic low-noise clocking. |
| Factory-programmable frequency | Eliminates need for external frequency synthesizers; reduces BOM count and board space in multi-rate telecom modules. |
| LVDS output compliance | Meets ANSI TIA/EIA-644-A; supports point-to-point and short stub topologies up to 15 cm without signal degradation. |
| OE-controlled output disable | Allows hot-swap clock domain isolation and power sequencing without disrupting PLL lock state or requiring reinitialization. |
| Extended temperature range | Validated operation from –40°C to +85°C ensures timing stability in outdoor small cells and central office environments. |
Applications
| Wireless Base Station Transceivers | Optical Transport Network (OTN) Line Cards |
|---|---|
Use Scenario: Synchronizing RF front-end sampling clocks and digital up/down-converters in LTE/5G massive MIMO radios. IC Role / Device Role / Timing Role: Primary low-jitter reference oscillator for ADC/DAC sampling clocks and FPGA-based digital signal processing blocks. Use Value: 0.476 ps RMS phase jitter at 231.25 MHz directly supports CPRI Option 3/7 link timing requirements and minimizes EVM degradation. | Use Scenario: Providing synchronous clocking for OTU2/OTU3 framer ASICs and FEC engines in DWDM line cards. IC Role / Device Role / Timing Role: System master clock source feeding multiple SerDes lanes operating at 10.709 Gbps or 43.018 Gbps. Use Value: Frequency programmability allows one part number to serve multiple line rate standards (e.g., 156.25 MHz for OTU1, 231.25 MHz for OTU2), reducing inventory complexity. |
| High-Speed Data Center Switches | Network Packet Processors |
Use Scenario: Clocking 100G/400G Ethernet PHYs and switch fabric interfaces in modular chassis switches. IC Role / Device Role / Timing Role: Low-phase-noise clock generator for IEEE 802.3bj KR4/CR4 CAUI-4 and 400G-FR8 interfaces. Use Value: Integer PLL configuration achieves 0.232–0.322 ps jitter at 500–1300 MHz, meeting IEEE 802.3bs jitter masks for 53.125 Gbps per lane. | Use Scenario: Supplying precise timing to multi-core network processors handling deep packet inspection and TLS offload. IC Role / Device Role / Timing Role: Reference clock for processor DDR4 memory controllers and PCIe Gen4/Gen5 root complexes. Use Value: Dual-voltage support (2.5 V/3.3 V) enables direct interface with both legacy and next-gen NPU I/O banks without level-shifting. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar programmable XO applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Si5338A-B-GM | 4-output I2C-programmable clock generator; higher integration but requires external configuration EEPROM and firmware. | Used where multi-frequency, multi-format (LVDS/LVPECL/HCSL) generation is needed - not a drop-in replacement. | Select when system requires dynamic reconfiguration or >1 output; avoid if single fixed-frequency LVDS XO suffices. |
| 8N4SV71EC-0001CDI8 | Same family, 6-pin CD package, but uses VCXO architecture with ±50 ppm pull range; lower phase noise at narrow offsets but wider long-term stability tolerance. | Preferred in PLL-based clock clean-up or jitter attenuation circuits where tunability matters more than absolute accuracy. | Choose for applications needing fine frequency adjustment (e.g., synchronization to external reference); not suitable for fixed-frequency master clock roles. |
Compared with Si5338A-B-GM and 8N4SV71EC-0001CDI8, the 8N4S271FC-0048CDI8 offers superior phase jitter performance at fixed frequencies, simpler integration (no I²C or EEPROM), and tighter initial accuracy (±10 ppm), making it optimal for cost-sensitive, high-performance master clock applications in telecom infrastructure.
Availability
8N4S271FC-0048CDI8 is available at Aetrix Electronics and suitable for wireless infrastructure, optical transport, and high-speed data center switching applications requiring stable component supply, guaranteed long-term availability, and full traceability through Renesas' extended product lifecycle program.
Supply support for 8N4S271FC-0048CDI8 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 is a global semiconductor leader delivering trusted embedded solutions for automotive, industrial, infrastructure, and IoT markets - formed through the merger of Renesas and IDT in 2019.
The 8N4S271FC-0048CDI8 belongs to Renesas' FemtoClock® NG programmable oscillator family, engineered specifically for high-frequency, low-jitter timing in 5G radio units, OTN line cards, and cloud-scale networking hardware.
FAQ
What is the factory-programmed output frequency of the 8N4S271FC-0048CDI8?
The 8N4S271FC-0048CDI8 is programmed to 231.25 MHz - a standard frequency used in CPRI, OBSAI, and OTU2 applications. This value is fixed at manufacture and cannot be altered in the field. The "0048" in the part number corresponds to the order code specifying this exact frequency and integer PLL configuration for optimal phase noise performance.
Does the 8N4S271FC-0048CDI8 support both 2.5 V and 3.3 V supply voltages?
Yes, the 8N4S271FC-0048CDI8 operates from either 2.5 V ±5% or 3.3 V ±5% supply voltage, as confirmed in Tables 4A and 4B of the datasheet. The device automatically adapts its internal biasing; no configuration is required. This dual-voltage capability simplifies integration into mixed-rail systems without level shifters.
What is the RMS phase jitter specification for the 8N4S271FC-0048CDI8 at 231.25 MHz?
At 231.25 MHz, the 8N4S271FC-0048CDI8 delivers 0.476–0.680 ps RMS phase jitter (12 kHz–20 MHz integration band) under integer PLL feedback mode - matching the "1xxx" order code configuration. This value is measured per JEDEC Standard 65 and meets OC-192 and 10G Ethernet jitter budgets.
Can the 8N4S271FC-0048CDI8 be used with AC-coupled LVDS receivers?
Yes, the 8N4S271FC-0048CDI8 supports AC-coupled LVDS receivers. Its LVDS outputs have a nominal common-mode voltage of 1.22 V (range 1.125–1.375 V), compatible with standard LVDS receivers. When AC-coupling, ensure the receiver's common-mode range accommodates the DC offset introduced by the series capacitor and termination network.
Is the OE pin on the 8N4S271FC-0048CDI8 internally pulled up?
Yes, the OE pin (pin 2) of the 8N4S271FC-0048CDI8 includes an internal 50 kΩ pullup resistor, as specified in Table 2 (Pin Characteristics). This ensures the outputs remain enabled (Q/nQ active) upon power-up unless actively driven low - simplifying power-on sequencing in systems without dedicated OE control logic.
8N4S271FC-0048CDI8 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- FemtoClock® NG
- Package/Case:
- 6-CLCC
- Packaging:
- Tape & Reel (TR)
- 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-0048CDI8 FAQ
1.How can I place an order for 8N4S271FC-0048CDI8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 8N4S271FC-0048CDI8 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-0048CDI8 reliable?
The price and inventory of 8N4S271FC-0048CDI8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 8N4S271FC-0048CDI8 is usually 5 days.
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We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 8N4S271FC-0048CDI8 transactions.
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8N4S271FC-0048CDI8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 8N4S271FC-0048CDI8 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-0048CDI8?
For technical support, including 8N4S271FC-0048CDI8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 8N4S271FC-0048CDI8 requirements.
6.How does Aetrix verify that 8N4S271FC-0048CDI8 is sourced from the original manufacturer or authorized distributors?
All 8N4S271FC-0048CDI8 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-0048CDI8 meets industry standards.
7.What is the process for return or replacement of 8N4S271FC-0048CDI8?
All 8N4S271FC-0048CDI8 units undergo pre-shipment inspection (PSI). If there is an issue with 8N4S271FC-0048CDI8, 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-0048CDI8 part is unused and in its original packaging.
Return procedure for 8N4S271FC-0048CDI8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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