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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.

FemtoClock Crystal-to-3.3V,2.5V LVPECL Clock Generator

Package Information

CAD Model:View CAD Model
Pkg. Type:TSSOP
Pkg. Code:PGG8
Lead Count (#):8
Pkg. Dimensions (mm):3.1 x 4.4 x 1.0
Pitch (mm):0.65

Environmental & Export Classifications

Moisture Sensitivity Level (MSL)1
Pb (Lead) FreeYes
ECCN (US)EAR99
HTS (US)8542.39.0090

Product Attributes

Lead Count (#)8
Carrier TypeReel
Moisture Sensitivity Level (MSL)1
Qty. per Reel (#)2500
Qty. per Carrier (#)0
Pb (Lead) FreeYes
Pb Free Categorye3 Sn
Temp. Range (°C)-40 to 85°C
Core Voltage (V)2.5V, 3.3V
Feedback InputNo
Input Freq (MHz)23.2 - 30
Input TypeCrystal
Inputs (#)1
Length (mm)3.1
MOQ2500
Output Banks (#)1
Output Freq Range (MHz)312.5 - 312.5, 625 - 625
Output TypeLVPECL
Output Voltage (V)2.5V, 3.3V
Outputs (#)1
Package Area (mm²)13.6
Phase Jitter Typ RMS (ps)0.36
Pitch (mm)0.65
Pkg. Dimensions (mm)3.1 x 4.4 x 1.0
Pkg. TypeTSSOP
Product CategoryFemtoClock, Low Jitter Clocks (<700 fs RMS)
Prog. ClockNo
Reel Size (in)13
Reference OutputNo
Requires Terms and ConditionsDoes not require acceptance of Terms and Conditions
Spread SpectrumNo
Tape & ReelYes
Thickness (mm)1
Width (mm)4.4

Description

The 843251I-12 is a 10Gb Ethernet clock generator that uses an 18pF parallel resonant crystal over the range of 23.2MHz - 30MHz. For Ethernet applications, a 25MHz crystal is used. The 843251I- 12 uses our 3rd generation low phase noise VCO technology, and can achieve <1ps rms phase jitter performance over the 1.875MHz - 20MHz integration range. The 843251I-12 is packaged in a small 8-pin TSSOP, making it ideal for use in systems with limited board space.