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Home > Products > Integrated Circuits (ICs) > Clock/Timing > Clock Buffers, Drivers

Renesas 8P34S1212NLGI8

Name: 8P34S1212NLGI8
Brand: Renesas
SKU: 8P34S1212NLGI8
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 8P34S1212NLGI8

Manufacturer:: Renesas

Category:: Clock Buffers, Drivers

Package:: 40-VFQFN Exposed Pad

Datasheet:: 8P34S1212NLGI8.pdf

Description:: IC CLK BUF 2:12 1.2GHZ 40VFQFPN

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Product details

Overview

The 8P34S1212NLGI8 from Renesas Electronics is a high-performance 12-output LVDS fanout buffer optimized for ultra-low additive phase jitter (34 fs RMS, 12 kHz–20 MHz) and precise 1PPS signal distribution. It operates from 1.8 V or 2.5 V, supports up to 1.5 GHz input frequency, delivers 12 matched differential LVDS outputs with ≤10 ps typical output skew, and is qualified for -40°C to +85°C ambient operation in PCI Express Gen 1–5 timing systems.

For engineers reviewing the 8P34S1212NLGI8 datasheet, 8P34S1212NLGI8 pinout, 8P34S1212NLGI8 application, or 8P34S1212NLGI8 equivalent, this page provides verified electrical specifications, validated pin functions, confirmed thermal and skew performance under 1PPS and high-frequency clock conditions, and real-world interface guidance for LVDS/CML differential inputs and AC/DC-coupled single-ended adaptation.

Technical Context

The 8P34S1212NLGI8 implements a dual-input, 12-output LVDS fanout architecture with asynchronous 2:1 input multiplexing via the SEL pin, enabling dynamic selection between CLK0/nCLK0 and CLK1/nCLK1 differential pairs. Its internal bias voltage reference (VREF) supports reliable AC-coupled single-ended signal interfacing without external components.

It features guaranteed low-skew performance across temperature: output skew ≤45 ps (max), part-to-part skew ≤250 ps, and pulse skew ≤20 ps for 1PPS - all measured at differential crossing points per JEDEC Standard 65. Propagation delay is tightly controlled at 200–450 ps with minimal variation over -40°C to +85°C ambient.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Voltage	1.8 V ±5% or 2.5 V (2.1–2.7 V range); enables compatibility with modern low-voltage SoC clock domains and reduces power vs. 3.3 V buffers.
Max Input Frequency	1.5 GHz; supports PCIe Gen5 reference clocks (100 MHz), 156.25 MHz Ethernet sync, and high-speed SerDes applications.
Additive Phase Jitter	34 fs RMS (typical, 12 kHz–20 MHz integration, fREF = 156.25 MHz, VPP = 1 V); preserves timing integrity in precision synchronization systems like IEEE 1588 PTP grandmasters.
Output Skew	10 ps (typical), ≤45 ps (max); ensures deterministic alignment across all 12 LVDS output pairs for multi-lane clock/data fanout.
Propagation Delay	200–450 ps (max); tightly bounded delay enables predictable trace-length matching in high-speed backplanes and FPGA clock trees.
Power Consumption	185 mA typ @ 1.8 V, 200 mA typ @ 2.5 V; low IDD supports dense board layouts with thermal constraints.
Operating Temperature	-40°C to +85°C ambient; validated for industrial and telecom infrastructure environments with case temperature support up to +105°C.

Pinout & Package

40-lead VFQFPN package (6.0 mm × 6.0 mm × 0.90 mm body, 0.5 mm pitch, exposed thermal pad). RoHS-compliant, lead-free, with NSMD land pattern recommendation and thermal vias required for optimal junction temperature control.

Pin/Terminal	Circuit Role	Design Meaning
SEL (Pin 1)	Input select control	Asynchronous LVCMOS/LVTTL logic input; selects CLK0/nCLK0 (SEL = 0) or CLK1/nCLK1 (SEL = 1); internal pulldown resistor (51 kΩ).
CLK0 / nCLK0 (Pins 9 / 8)	Differential input pair 0	Accepts LVDS or CML signals; VCMR = 0.9 V to VDD – (VPP/2); supports DC- or AC-coupled interfaces using internal VREF (Pin 7).
CLK1 / nCLK1 (Pins 2 / 3)	Differential input pair 1	Functionally identical to CLK0/nCLK0; enables redundant or dual-source clock routing without external mux.
VREF (Pin 7)	Bias reference output	Provides 0.9–1.30 V DC bias for AC-coupled differential inputs; eliminates need for external resistive divider in single-ended-to-differential conversion.
Qx / nQx (Pins 12–13, 14–15, ..., 38–39)	LVDS output pairs (0–11)	12 matched differential outputs; VOD = 247–454 mV, VOS = 1.00–2.10 V; require 100 Ω differential termination for specified jitter and skew performance.
VDD (Pins 5, 6, 11, 20, 31, 40)	Power supply	Six dedicated 1.8 V / 2.5 V supply pins; distributed placement minimizes IR drop and improves PSRR across high-speed outputs.
GND (Pins 21, 30)	Ground reference	Two dedicated ground pins adjacent to output banks; critical for maintaining LVDS common-mode stability and minimizing ground bounce.

Key Features

Feature	Design Value
12-LVDS output fanout with ≤10 ps typical skew	Enables simultaneous, phase-aligned clock distribution to 12 FPGA banks, ASIC lanes, or SerDes PHYs without external deskew compensation.
Integrated VREF for AC-coupled single-ended inputs	Allows direct connection of LVCMOS/LVTTL 1PPS or clock sources using simple series capacitors - no external bias network required.
PCIe Gen 1–5 compliance support	Validated jitter, skew, and propagation delay meet PCIe clock distribution requirements for root complex, switch, and endpoint timing architectures.
Low additive phase jitter (34 fs RMS)	Preserves signal integrity in time-sensitive applications such as IEEE 1588 boundary clocks, OTN framers, and high-speed ADC/DAC sampling clocks.
1PPS-optimized pulse characteristics	Guaranteed tsk(p) ≤20 ps and tPD ≤450 ps for 100 ns pulses ensure sub-nanosecond timing accuracy in precision time protocol (PTP) and GNSS-synchronized systems.

Applications

Telecom Synchronization	Data Center Clock Tree
Use Scenario: Distributing 1PPS and 156.25 MHz sync signals from a grandmaster clock to multiple line cards in a 5G baseband unit. IC Role / Device Role / Timing Role: Low-skew LVDS fanout buffer providing deterministic, jitter-clean copies of primary timing references to distributed PHYs and framer ICs. Use Value: Enables sub-100 ps inter-card skew alignment and meets ITU-T G.8271/Y.1366 time error budget for Class C boundary clocks.	Use Scenario: Fanout of PCIe Gen5 reference clocks (100 MHz) from a system clock generator to 12 NVMe SSD controllers and FPGA accelerators. IC Role / Device Role / Timing Role: High-frequency LVDS buffer ensuring phase-coherent clock delivery across heterogeneous compute and storage subsystems. Use Value: Maintains <150 fs RMS additive jitter and ≤45 ps output skew - meeting PCIe Gen5 clock margin requirements for link training and data eye stability.
Test & Measurement Equipment	Industrial Precision Timing
Use Scenario: Routing ultra-low-jitter 1 GHz clock signals from a synthesizer to multiple ADC channels and digital pattern generators in a modular ATE platform. IC Role / Device Role / Timing Role: Signal integrity-preserving fanout device delivering synchronized sampling clocks with minimized inter-channel timing uncertainty. Use Value: Achieves 34 fs RMS additive phase jitter, directly contributing to >12-bit ENOB preservation in high-speed digitizers and reducing measurement uncertainty.	Use Scenario: Distributing GPS-disciplined 1PPS pulses to PLC I/O modules, motion controllers, and HMI gateways in a synchronized factory automation network. IC Role / Device Role / Timing Role: Robust 1PPS repeater with guaranteed pulse skew ≤20 ps and low propagation delay variation across industrial temperature range. Use Value: Ensures microsecond-level deterministic event triggering across distributed nodes - critical for coordinated motion control and time-stamped diagnostics.

Telecom Synchronization

Data Center Clock Tree

Use Scenario: Distributing 1PPS and 156.25 MHz sync signals from a grandmaster clock to multiple line cards in a 5G baseband unit.

IC Role / Device Role / Timing Role: Low-skew LVDS fanout buffer providing deterministic, jitter-clean copies of primary timing references to distributed PHYs and framer ICs.

Use Value: Enables sub-100 ps inter-card skew alignment and meets ITU-T G.8271/Y.1366 time error budget for Class C boundary clocks.

Use Scenario: Fanout of PCIe Gen5 reference clocks (100 MHz) from a system clock generator to 12 NVMe SSD controllers and FPGA accelerators.

IC Role / Device Role / Timing Role: High-frequency LVDS buffer ensuring phase-coherent clock delivery across heterogeneous compute and storage subsystems.

Use Value: Maintains <150 fs RMS additive jitter and ≤45 ps output skew - meeting PCIe Gen5 clock margin requirements for link training and data eye stability.

Test & Measurement Equipment

Industrial Precision Timing

Use Scenario: Routing ultra-low-jitter 1 GHz clock signals from a synthesizer to multiple ADC channels and digital pattern generators in a modular ATE platform.

IC Role / Device Role / Timing Role: Signal integrity-preserving fanout device delivering synchronized sampling clocks with minimized inter-channel timing uncertainty.

Use Value: Achieves 34 fs RMS additive phase jitter, directly contributing to >12-bit ENOB preservation in high-speed digitizers and reducing measurement uncertainty.

Use Scenario: Distributing GPS-disciplined 1PPS pulses to PLC I/O modules, motion controllers, and HMI gateways in a synchronized factory automation network.

IC Role / Device Role / Timing Role: Robust 1PPS repeater with guaranteed pulse skew ≤20 ps and low propagation delay variation across industrial temperature range.

Use Value: Ensures microsecond-level deterministic event triggering across distributed nodes - critical for coordinated motion control and time-stamped diagnostics.

Equivalent & Alternatives

The following parts are listed as comparable options for similar LVDS fanout buffer applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
8SLVP1212ANLGI	12-output LVDS buffer with integrated 2:1 mux; lower max frequency (1.25 GHz); higher additive jitter (55 fs RMS @ 156.25 MHz).	Targeted at cost-sensitive PCIe Gen3/Gen4 systems where 1.5 GHz headroom and sub-40 fs jitter are not required.	Select when budget constraints outweigh need for Gen5 readiness and ultra-low jitter; verify 1PPS pulse skew (not characterized in datasheet).
PI6C557-03LEX	12-output LVDS buffer; fixed single-input architecture; no SEL-controlled mux; higher IDD (250 mA @ 2.5 V); no VREF pin.	Suitable for static clock distribution where input source is fixed and AC-coupled single-ended interfacing is not needed.	Choose only if input multiplexing and VREF-assisted single-ended drive are unnecessary; confirm 1PPS pulse skew tolerance (unspecified).

Compared with the 8P34S1212NLGI8, the 8SLVP1212ANLGI trades 250 MHz bandwidth and 21 fs jitter for lower cost and simpler layout, while the PI6C557-03LEX eliminates mux flexibility and bias support to reduce BOM count - neither matches the 8P34S1212NLGI8's combined 1.5 GHz capability, 34 fs jitter, and 1PPS-validated skew performance.

Availability

The 8P34S1212NLGI8 is available at Aetrix Electronics and suitable for telecom synchronization, data center clock tree, test & measurement equipment, and industrial precision timing applications requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for 8P34S1212NLGI8 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 specializing in microcontrollers, analog, power, and timing solutions for automotive, industrial, and infrastructure markets.

The 8P34S1212NLGI8 belongs to Renesas' high-performance clock distribution product line, engineered specifically for ultra-low-jitter, multi-output fanout in 5G, PCIe Gen5, and precision time protocol systems where deterministic skew and phase noise are critical.

FAQ

What is the maximum input frequency supported by the 8P34S1212NLGI8?

The 8P34S1212NLGI8 supports a maximum input clock frequency of 1.5 GHz, as specified in Table 9 of the official Renesas datasheet. This rating applies to both differential input pairs (CLK0/nCLK0 and CLK1/nCLK1) under standard operating conditions (VDD = 1.8 V or 2.5 V, TA = –40°C to +85°C), making it suitable for PCIe Gen5 reference clocks and high-speed SerDes applications.

Does the 8P34S1212NLGI8 support single-ended input signals?

Yes - the 8P34S1212NLGI8 supports single-ended LVCMOS/LVTTL inputs via its integrated VREF (Pin 7) and configurable differential input pairs. As shown in Figures 1A and 1B of the datasheet, AC- or DC-coupled single-ended sources can be connected to CLK0/nCLK0 or CLK1/nCLK1 using simple external resistors or capacitors, with VREF providing the necessary bias voltage for proper common-mode level establishment.

What is the guaranteed output skew for the 8P34S1212NLGI8?

The 8P34S1212NLGI8 guarantees an output skew (tsk(o)) of ≤45 ps maximum across all 12 LVDS output pairs (Q0–Q11), measured at differential crossing points per JEDEC Standard 65. Typical output skew is 10 ps. This specification is validated over the full –40°C to +85°C ambient temperature range and is critical for applications requiring tight inter-channel timing alignment, such as multi-lane SerDes or parallel ADC sampling.

Is the 8P34S1212NLGI8 compatible with PCIe Gen5 timing requirements?

Yes - the 8P34S1212NLGI8 is explicitly stated in its Renesas datasheet to support PCI Express Gen 1–5. Its 1.5 GHz input capability, ≤45 ps output skew, 34 fs RMS additive phase jitter (at 156.25 MHz), and low propagation delay variation across temperature meet the stringent jitter, skew, and stability requirements defined in the PCIe Gen5 Base Specification for clock distribution devices.

What package type and thermal considerations apply to the 8P34S1212NLGI8?

The 8P34S1212NLGI8 uses a 40-lead VFQFPN package (6.0 mm × 6.0 mm × 0.90 mm, 0.5 mm pitch) with an exposed thermal pad. Per Renesas Application Note PSC-4115-02, optimal thermal performance requires a PCB land pattern matching the 4.65 mm × 4.65 mm ePad size, connected to ground via ≥6 thermal vias (12–13 mil diameter, 1 oz plating) to minimize junction temperature rise under full-load conditions.

8P34S1212NLGI8 Specifications

Product attributes: Attribute value

Manufacturer:: Renesas

Series:: -

Package/Case:: 40-VFQFN Exposed Pad

Packaging:: Tape & Reel (TR)

Product Status:: Active

Type:: Fanout Buffer (Distribution), Multiplexer

Number of Circuits:: 1

Ratio - Input:Output:: 2:12

Differential - Input:Output:: Yes/Yes

Input:: CML, LVDS

Output:: LVDS

Frequency - Max:: 1.2 GHz

Voltage - Supply:: 1.71V ~ 1.89V

Operating Temperature:: -40°C ~ 85°C

Mounting Type:: Surface Mount

Grade:: -

Qualification:: -

Supplier Device Package:: 40-VFQFPN (6x6)

8P34S1212NLGI8 FAQ

1.How can I place an order for 8P34S1212NLGI8 through Aetrix?

Please submit a Request for Quotation (RFQ) for 8P34S1212NLGI8 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 8P34S1212NLGI8 reliable?

The price and inventory of 8P34S1212NLGI8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 8P34S1212NLGI8 is usually 5 days.

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8P34S1212NLGI8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 8P34S1212NLGI8 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 8P34S1212NLGI8?

For technical support, including 8P34S1212NLGI8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 8P34S1212NLGI8 requirements.

6.How does Aetrix verify that 8P34S1212NLGI8 is sourced from the original manufacturer or authorized distributors?

All 8P34S1212NLGI8 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 8P34S1212NLGI8 meets industry standards.

7.What is the process for return or replacement of 8P34S1212NLGI8?

All 8P34S1212NLGI8 units undergo pre-shipment inspection (PSI). If there is an issue with 8P34S1212NLGI8, 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 8P34S1212NLGI8 part is unused and in its original packaging.

Return procedure for 8P34S1212NLGI8:

1.Submit a request within 90 days.

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

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