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Renesas Electronics Corporation

Renesas’ Timing product portfolio has been acquired by SiTime.

Datasheets, documentation, and sample orders remain available on Renesas.com through late 2026. For new designs, purchasing, support, and product inquiries, visit SiTime.com or send an email to [email protected]. Full transition to SiTime is expected by late 2026.

I2C Programmable Ethernet Clock Generator

Package Information

CAD Model:View CAD Model
Pkg. Type:VFQFPN
Pkg. Code:NLG56
Lead Count (#):56
Pkg. Dimensions (mm):8.0 x 8.0 x 0.85
Pitch (mm):0.5

Environmental & Export Classifications

Moisture Sensitivity Level (MSL)3
Pb (Lead) FreeYes
ECCN (US)EAR99
HTS (US)8542.39.0090

Product Attributes

Lead Count (#)56
Carrier TypeTray
Moisture Sensitivity Level (MSL)3
Qty. per Reel (#)0
Qty. per Carrier (#)260
Pb (Lead) FreeYes
Pb Free Categorye3 Sn
Temp. Range (°C)-40 to 85°C
Additive Phase Jitter Typ RMS (fs)300
Advanced FeaturesProgrammable Clock, Feedback Input
Core Voltage (V)3.3V, 2.5V
Feedback InputYes
Input Freq (MHz)10 - 120
Input TypeCrystal, Differential
Inputs (#)2
Length (mm)8
MOQ260
Output Banks (#)5
Output Freq Range (MHz)8.33 - 125
Output TypeLVPECL, LVDS, LVCMOS
Output Voltage (V)3.3V, 2.5V
Outputs (#)13
Package Area (mm²)64
Pitch (mm)0.5
Pkg. Dimensions (mm)8.0 x 8.0 x 0.85
Pkg. TypeVFQFPN
Product CategoryUltra-Low Jitter Clocks (<300 fs RMS)
Prog. ClockYes
Prog. InterfaceSerial
Reference OutputYes
Requires Terms and ConditionsDoes not require acceptance of Terms and Conditions
Spread SpectrumNo
Tape & ReelNo
Thickness (mm)0.85
Width (mm)8

Description

The 8T49N4811 is a highly flexible FemtoClock® NG pin-programmable clock generator suitable for networking and communications applications. It can generate five different output frequencies with multiple copies of each. A fundamental mode crystal, single-ended, or differential input reference may be used as the source for the output frequency.

The use of pin programming to select the input source/frequency, desired output frequencies, and output styles allows a single device to be used in a wide variety of applications without the need for register programming.

Selection pins use 3-level options to maximize flexibility while minimizing package size. Selection is performed by tying a selection pin high or low or by leaving it floating, eliminating the need for passive components to drive a desired logic level.