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

Renesas 8T49N287A-999NLGI

Name: 8T49N287A-999NLGI
Brand: Renesas
SKU: 8T49N287A-999NLGI
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 8T49N287A-999NLGI

Manufacturer:: Renesas

Category:: Clock Generators, PLLs, Frequency Synthesizers

Package:: 56-VFQFN Exposed Pad

Datasheet:: 8T49N287A-999NLGI.pdf

Description:: IC TRANSLATOR UNIV FREQ VFQFN

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Product details

Overview

8T49N287A-999NLGI from Renesas Electronics is a dual-loop, fractional-N universal frequency translator IC designed for jitter attenuation and precise frequency synthesis in telecom timing systems. It features two independent PLLs, eight programmable differential outputs (LVPECL/LVDS/HCSL/LVCMOS), ±50 ppb initial holdover accuracy, <0.3 ps RMS jitter (12 kHz–20 MHz), and supports ITU-T G.709 FEC-compliant 1G/10G/40G/100G SyncE, OTN, and SONET/SDH line cards.

For engineers reviewing the 8T49N287A-999NLGI datasheet, 8T49N287A-999NLGI pinout, 8T49N287A-999NLGI application, or 8T49N287A-999NLGI equivalent, this device delivers hitless reference switching, individual output phase delay (16 ps steps), I²C programmability, and dual-input clock monitoring with gapped-clock LOS detection - critical for carrier-grade timing resilience and multi-rate synchronization.

Technical Context

The 8T49N287A-999NLGI implements two fully independent fractional-feedback PLLs, each with register-selectable loop bandwidth (1.4 Hz–360 Hz) and three operational states: locked, holdover, and free-run. Each PLL accepts LVPECL/LVDS/LVHSTL/HCSL/LVCMOS inputs (8 kHz–875 MHz) or crystal (10–40 MHz), enabling autonomous reference selection with priority-based automatic hitless switching.

It generates eight synchronized outputs: Q[0:3] support fully independent frequencies (8 kHz–1 GHz); Q[4:7] derive integer-related frequencies from PLLs, inputs, or crystal. Output drivers support per-bank skew control, phase-slope limiting, or fully hitless switchover, with programmable phase alignment across all eight outputs.

Key Specifications

Parameter	Value and Actual Design Meaning
PLL Count	Two independent fractional-N PLLs for separate transmit/receive path timing or redundancy.
Output Count & Type	Eight differential outputs (Q0–Q7, each with true/complement pins); supports LVPECL/LVDS/HCSL (up to 1 GHz) or LVCMOS (up to 250 MHz).
Jitter Performance	<0.3 ps RMS (12 kHz–20 MHz), enabling compliance with ITU-T G.8262 Class D and EEC-60870-5-104 timing masks.
Holdover Accuracy	±50 ppb initial offset at holdover entry; maintains historical average operating point for stable short-term drift compensation.
Input Flexibility	Accepts two differential clocks (8 kHz–875 MHz) + crystal (10–40 MHz); supports gapped-clock LOS detection with user-configurable timeout.
Control Interface	I²C slave interface (7-bit address with S_A0 bit) + optional I²C master mode for EEPROM auto-configuration at power-up.
Phase Control	Individual output phase delay down to 16 ps resolution; output-output alignment configurable per divider source and stage.

Pinout & Package

Package: 56-pin, 8 mm × 8 mm VFQFN (RoHS-compliant, lead-free, ePad grounded). Thermal pad must be connected to PCB ground for proper thermal dissipation and electrical stability.

Pin/Terminal	Circuit Role	Design Meaning
CLK0 / nCLK0 CLK1 / nCLK1	Differential input pairs	Accept LVPECL/LVDS/HCSL/LVCMOS clocks up to 875 MHz; internal biasing enables single-ended use with external termination.
OSCI / OSCO	Crystal oscillator interface	Drives 10–40 MHz fundamental-mode parallel-resonant crystal; OSCO left unconnected when external oscillator used on OSCI.
Q0–Q7 / nQ0–nQ7	Differential output pairs	Eight independent clock outputs; each pair powered by dedicated VCCOx rail (1.8V/2.5V/3.3V selectable per bank).
nRST	Master reset input	Active-low LVTTL/LVCMOS signal; resets all registers and state machines to default values on assertion.
nINT	Open-drain interrupt output	Asserts on Lock/Holdover/LOS status change or register-defined events; requires external pull-up for logic-level compatibility.
SCLK / SDATA	I²C bidirectional interface	Standard 7-bit I²C slave operation; supports EEPROM auto-load via integrated I²C master when configured.
GPIO[0:3]	Configurable I/O	Four general-purpose pins usable as status outputs (Lock/Holdover/LOS), control inputs (CSELn), or interrupt sources.
PLL_BYP	Bypass control input	Directs CLK0 → Q4 and CLK1 → Q5 paths; enables system-level clock path validation without PLL processing.

Key Features

Feature	Design Value
Fully hitless reference switching	Maintains deterministic output phase during input clock transitions - essential for zero-packet-loss SyncE handover and OTN de-mapping.
Gapped-clock LOS monitoring	User-programmable monitor timeout (17-bit counter) detects missing edges in FEC-aligned or DCO-mode gapped clocks without false alarms.
Per-PLL holdover behavior selection	Three modes (instantaneous, fast-average IIR, center-tune) let designers optimize long-term stability vs. short-term accuracy trade-offs.
Output bank skew control	Three defined output banks (Q0/Q1; Q4/Q5; Q6/Q7) enable precise inter-bank skew measurement and board-level timing closure.
Flexible power domain partitioning	Independent VCC (core), VCCA (analog PLL), and eight VCCOx (output driver) rails allow mixed-voltage signaling and noise isolation.

Applications

OTN Line Card Timing	SyncE Base Station
Use Scenario: OTN multiplexer/de-multiplexer supporting G.709 FEC rates with gapped clock inputs and DCO mode. IC Role / Device Role / Timing Role: Jitter attenuator and frequency translator generating independent line-rate clocks (e.g., 10.709 GHz, 43.018 GHz) plus FEC-aligned recovery clocks. Use Value: Enables hitless switching between primary/backup line references while maintaining G.709-compliant timing accuracy and sub-0.3 ps jitter for error-free FEC decoding.	Use Scenario: Wireless base station baseband unit requiring SyncE-compliant 1588 boundary clock and fronthaul timing. IC Role / Device Role / Timing Role: Dual-PLL timing engine providing separate locked clocks for CPRI/eCPRI interfaces and IEEE 1588 PTP timestamping. Use Value: Delivers ±50 ppb holdover during GPS outage and supports G.8262 Class D compliance with <0.3 ps RMS jitter for low-latency fronthaul synchronization.
SONET/SDH OC-192	100G Ethernet Switch
Use Scenario: Legacy SONET/SDH add-drop multiplexer requiring OC-192 (9.953 Gbps) and multiple tributary clocks (e.g., STS-1, STS-3c). IC Role / Device Role / Timing Role: Universal frequency translator generating exact ITU-T G.707 line rates and mapped tributary frequencies from a single reference. Use Value: Eliminates need for discrete clock synthesizers; achieves 0 ppm conversion error across all OC-n rates using fractional-N dividers and crystal-referenced holdover.	Use Scenario: High-density 100G Ethernet switch fabric requiring independent SerDes clocks (103.125 GHz, 156.25 MHz, 322.265625 MHz) with phase alignment. IC Role / Device Role / Timing Role: Multi-output clock generator delivering phase-aligned clocks to multiple ASICs/FPGAs with programmable skew compensation. Use Value: Reduces inter-chip skew to <50 ps via per-output 16-ps phase delay tuning, enabling deterministic SerDes link training and BER <1e−12 at 100G.

OTN Line Card Timing

SyncE Base Station

Use Scenario: OTN multiplexer/de-multiplexer supporting G.709 FEC rates with gapped clock inputs and DCO mode.

IC Role / Device Role / Timing Role: Jitter attenuator and frequency translator generating independent line-rate clocks (e.g., 10.709 GHz, 43.018 GHz) plus FEC-aligned recovery clocks.

Use Value: Enables hitless switching between primary/backup line references while maintaining G.709-compliant timing accuracy and sub-0.3 ps jitter for error-free FEC decoding.

Use Scenario: Wireless base station baseband unit requiring SyncE-compliant 1588 boundary clock and fronthaul timing.

IC Role / Device Role / Timing Role: Dual-PLL timing engine providing separate locked clocks for CPRI/eCPRI interfaces and IEEE 1588 PTP timestamping.

Use Value: Delivers ±50 ppb holdover during GPS outage and supports G.8262 Class D compliance with <0.3 ps RMS jitter for low-latency fronthaul synchronization.

SONET/SDH OC-192

100G Ethernet Switch

Use Scenario: Legacy SONET/SDH add-drop multiplexer requiring OC-192 (9.953 Gbps) and multiple tributary clocks (e.g., STS-1, STS-3c).

IC Role / Device Role / Timing Role: Universal frequency translator generating exact ITU-T G.707 line rates and mapped tributary frequencies from a single reference.

Use Value: Eliminates need for discrete clock synthesizers; achieves 0 ppm conversion error across all OC-n rates using fractional-N dividers and crystal-referenced holdover.

Use Scenario: High-density 100G Ethernet switch fabric requiring independent SerDes clocks (103.125 GHz, 156.25 MHz, 322.265625 MHz) with phase alignment.

IC Role / Device Role / Timing Role: Multi-output clock generator delivering phase-aligned clocks to multiple ASICs/FPGAs with programmable skew compensation.

Use Value: Reduces inter-chip skew to <50 ps via per-output 16-ps phase delay tuning, enabling deterministic SerDes link training and BER <1e−12 at 100G.

Equivalent & Alternatives

The following parts are listed as comparable options for similar universal frequency translator applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
8T49N286A-999NLGI	Same dual-PLL architecture but limited to six outputs (Q0–Q5); no Q6/Q7 or associated dividers.	Suitable for cost-sensitive 6-output SyncE/OTN designs where full octal capability is unnecessary.	Select when octal output count is not required and BOM cost optimization is prioritized over future scalability.
Si5341-A01AGM	Four PLLs, 10 outputs, higher max frequency (710 MHz LVDS), but no gapped-clock LOS support or phase-slope limiting.	Better suited for datacenter clock trees requiring >8 outputs and ultra-low jitter (<0.15 ps), but lacks telecom-specific holdover and hitless switching robustness.	Choose for high-port-count Ethernet switches needing broader frequency coverage and lower jitter, accepting reduced telecom-grade fault resilience.

Compared with 8T49N287A-999NLGI, the 8T49N286A-999NLGI reduces output count and feature set for cost savings, while the Si5341-A01AGM expands output count and jitter performance at the expense of telecom-specific reliability features like gapped-clock monitoring and programmable holdover behavior.

Availability

8T49N287A-999NLGI is available at Aetrix Electronics and suitable for OTN line cards, SyncE base stations, SONET/SDH equipment, and 100G Ethernet switches requiring stable component supply, long-lifecycle support, and guaranteed RoHS-compliant sourcing.

Supply support for 8T49N287A-999NLGI 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 communications infrastructure.

The 8T49N287A-999NLGI belongs to Renesas' FemtoClock® NG family - engineered specifically for carrier-grade timing in Synchronous Ethernet, OTN, and SONET/SDH systems where jitter, holdover accuracy, and hitless failover are non-negotiable.

FAQ

What is the maximum output frequency supported by 8T49N287A-999NLGI for LVPECL/LVDS/HCSL signaling?

The 8T49N287A-999NLGI supports differential output frequencies up to 1.0 GHz when configured for LVPECL, LVDS, or HCSL signaling. This capability enables direct clocking of high-speed SerDes lanes in 100G Ethernet and OTN applications without external frequency multiplication. The 1.0 GHz limit applies specifically to Q[0:3] and Q[4:7] outputs under valid VCCO voltage and load conditions specified in the AC Electrical Characteristics table.

Does 8T49N287A-999NLGI support gapped-clock inputs, and how is Loss of Signal (LOS) handled in that mode?

Yes, 8T49N287A-999NLGI explicitly supports gapped-clock inputs via user-configurable LOS monitoring. The monitor timeout is set using a 17-bit counter driven by a divided VCO clock, allowing gap detection up to thousands of cycles for high-frequency references. In gapped mode, the PLL continues adjusting during expected gaps and only declares LOS after twice the programmed gap duration elapses - preventing false alarms during FEC-aligned or DCO-mode operation.

How does the holdover function operate in 8T49N287A-999NLGI, and what are the available modes?

The 8T49N287A-999NLGI offers three holdover modes per PLL: instantaneous (uses DPLL frequency 100 ms before holdover entry), fast-average (IIR-filtered historical offset with ~20-minute time constant), and center-tune (returns to VCO band center). Initial holdover accuracy is ±50 ppb. Mode selection is register-controlled and determines how the device compensates for input reference loss while preserving traceability to prior operating conditions.

Can 8T49N287A-999NLGI generate four completely independent output frequencies, and which outputs support this capability?

Yes, 8T49N287A-999NLGI can generate four fully independent output frequencies on Q0–Q3. These outputs may be sourced from either PLL0 or PLL1 and support fractional-N division, enabling exact frequency synthesis across 8 kHz–1 GHz without dependency on input frequencies. This independence is foundational for multi-rate OTN de-mapping and SyncE multi-layer timing distribution.

What power supply configurations are supported by 8T49N287A-999NLGI, and how are they assigned?

The 8T49N287A-999NLGI supports multiple power domains: VCC (3.3 V or 2.5 V core/digital), VCCA (3.3 V or 2.5 V analog PLL), and eight independent VCCOx rails (1.8 V / 2.5 V / 3.3 V) for output drivers. VCCO0–VCCO3 power Q0–Q3; VCCO4–VCCO7 power Q4–Q7. This partitioning allows mixed-signaling (e.g., LVPECL on Q0, LVCMOS on Q7) and noise isolation between analog PLLs and high-speed outputs.

8T49N287A-999NLGI Specifications

Product attributes: Attribute value

Manufacturer:: Renesas

Series:: FemtoClock® NG

Package/Case:: 56-VFQFN Exposed Pad

Packaging:: Tray

Product Status:: Active

Programmable:: Not Verified

Type:: -

PLL:: Yes with Bypass

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

Output:: LVCMOS, LVDS, LVPECL

Number of Circuits:: 1

Ratio - Input:Output:: 3:8

Differential - Input:Output:: Yes/Yes

Frequency - Max:: 1GHz

Divider/Multiplier:: Yes/No

Voltage - Supply:: 2.375V ~ 3.465V

Operating Temperature:: -40°C ~ 85°C

Mounting Type:: Surface Mount

Grade:: -

Qualification:: -

Supplier Device Package:: 56-VFQFPN (8x8)

8T49N287A-999NLGI FAQ

1.How can I place an order for 8T49N287A-999NLGI through Aetrix?

Please submit a Request for Quotation (RFQ) for 8T49N287A-999NLGI on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

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The price and inventory of 8T49N287A-999NLGI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 8T49N287A-999NLGI is usually 5 days.

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6.How does Aetrix verify that 8T49N287A-999NLGI is sourced from the original manufacturer or authorized distributors?

All 8T49N287A-999NLGI 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 8T49N287A-999NLGI meets industry standards.

7.What is the process for return or replacement of 8T49N287A-999NLGI?

All 8T49N287A-999NLGI units undergo pre-shipment inspection (PSI). If there is an issue with 8T49N287A-999NLGI, 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 8T49N287A-999NLGI part is unused and in its original packaging.

Return procedure for 8T49N287A-999NLGI:

1.Submit a request within 90 days.

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

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