Renesas 8T49N286A-998NLGI

Overview

8T49N286A-998NLGI from Renesas Electronics (formerly IDT) is a programmable universal frequency translator IC designed for high-precision clock synthesis and jitter attenuation in telecom, datacom, and enterprise networking systems. It supports up to 4 differential or single-ended inputs and 8 LVPECL/LVDS/LVCMOS outputs, delivers <150 fs RMS jitter (12 kHz–20 MHz), and operates with a 3.3 V core supply and configurable 1.8/2.5/3.3 V output supplies.

For engineers reviewing the 8T49N286A-998NLGI datasheet, 8T49N286A-998NLGI pinout, 8T49N286A-998NLGI application, or 8T49N286A-998NLGI equivalent, key selection considerations include its fractional-N PLL architecture, I²C programmability, EEPROM boot capability, mixed-voltage output support, and compatibility with Timing Commander™ configuration software.

Technical Context

The 8T49N286A-998NLGI implements a dual-loop fractional-N PLL architecture: one loop for input reference clean-up and jitter attenuation, and a second for flexible frequency synthesis. It accepts input frequencies from 0.001 MHz to 750 MHz and generates output frequencies from 0.001 MHz to 1.25 GHz across eight independently configurable outputs.

It features integrated EEPROM for autonomous boot, GPIO-controlled DC settings (CLK_SEL, PLL_BYPASS), and hardware-configurable input termination (AC-coupled differential/single-ended). Output voltage levels (1.8 V/2.5 V/3.3 V) are per-output selectable via dedicated VCCOx rails, enabling mixed-signal timing distribution without level-shifting components.

Key Specifications

Pinout & Package

8T49N286A-998NLGI is housed in a 64-pin QFN package (9 mm × 9 mm, 0.5 mm pitch) with exposed thermal pad. Pin functions are validated per Renesas' official 8T49N286 datasheet and EVK-UFT285-6-7 schematic documentation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with Si5341-B-GM and LMK04832RHAR, the 8T49N286A-998NLGI uniquely balances 8-output scalability, per-bank voltage control, and autonomous EEPROM boot-making it optimal for carrier-class infrastructure where reliability, configurability, and mixed-interface timing coexist.

Availability

8T49N286A-998NLGI is available at Aetrix Electronics and suitable for 5G radio unit timing, optical transport terminal clock regeneration, enterprise switch clock distribution, and SD-WAN edge appliance synchronization requiring stable component supply and long-term lifecycle assurance.

Supply support for 8T49N286A-998NLGI 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 design innovation, with deep expertise in timing, analog, and connectivity solutions for infrastructure and industrial markets.

The 8T49N286A-998NLGI belongs to Renesas' Universal Frequency Translator (UFT) family - engineered specifically for high-reliability, multi-protocol timing in telecom transport, datacenter switching, and wireless infrastructure equipment.

FAQ

What is the primary function of the 8T49N286A-998NLGI in a timing system?

The 8T49N286A-998NLGI serves as a programmable universal frequency translator that performs both jitter attenuation and precise frequency synthesis. It cleans noisy input references using a dual-loop fractional-N PLL and generates up to eight low-jitter output clocks with independent format and voltage configuration. Its role in a timing system is to provide deterministic, high-stability clocking for sensitive interfaces like SerDes, memory controllers, and RF sampling circuits - all within a single 64-pin QFN package.

Does the 8T49N286A-998NLGI support autonomous startup without a host processor?

Yes, the 8T49N286A-998NLGI supports autonomous startup via on-board EEPROM boot. When configured for EEPROM mode, the device loads its complete register map-including input selection, PLL settings, output formats, and VCCO assignments-at power-up without requiring I²C communication from a host MCU. This feature is validated in the EVK-UFT285-6-7 evaluation board documentation and is essential for carrier-grade systems requiring zero-touch provisioning and fail-safe timing recovery.

Can the 8T49N286A-998NLGI generate different output voltages simultaneously?

Yes, the 8T49N286A-998NLGI supports true mixed-voltage operation: each of its eight outputs (Q0–Q7) connects to an independent VCCOx power rail (VCCO0 through VCCO7), allowing simultaneous 1.8 V, 2.5 V, and 3.3 V LVCMOS outputs on the same device. This is implemented via discrete 0 Ω resistors on the EVK-UFT285-6-7 board, which can be removed to isolate individual VCCOx rails and bias them with separate supplies - eliminating external level shifters in heterogeneous timing architectures.

What input signal types does the 8T49N286A-998NLGI accept?

The 8T49N286A-998NLGI accepts both differential (LVPECL, LVDS, HCSL) and single-ended (LVCMOS) input signals across its four clock inputs (CLK0–CLK3). Input termination is AC-coupled by default, with sense lines (e.g., CLK0_S/nCLK0_S) provided for oscilloscope monitoring. For sub-1 MHz signals, the evaluation board recommends replacing coupling capacitors with zero-ohm resistors and ensuring input DC common-mode voltage meets the device's Vcmr specification - as confirmed in the EVK-UFT285-6-7 User Guide Section 12.

How is the 8T49N286A-998NLGI configured and programmed in-system?

The 8T49N286A-998NLGI is configured via its standard I²C interface (SCL/SDA pins), supporting up to 400 kHz operation. Renesas provides Timing Commander™ software, which communicates with the device through the EVK-UFT285-6-7 USB interface to program registers, store configurations in external EEPROM, and perform real-time jitter measurements. All configuration parameters - including PLL dividers, output formats, slew rates, and power-down states - are accessible through documented register maps in the official 8T49N286 datasheet.