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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 NG Crystal-to-LVCMOS/LVTTL Clock Synthesizer

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)19.2 - 19.2, 19.44 - 19.44, 19.5312 - 19.5312
Input TypeCrystal
Inputs (#)1
Length (mm)3.1
MOQ2500
Output Banks (#)1
Output Freq Range (MHz)153.6 - 153.6, 155.52 - 155.52, 156.25 - 156.25, 76.8 - 76.8, 77.76 - 77.76
Output TypeLVCMOS
Output Voltage (V)2.5V, 3.3V
Outputs (#)1
Package Area (mm²)13.6
Phase Jitter Max RMS (ps)0.138
Phase Jitter Typ RMS (ps)0.101
Pitch (mm)0.65
Pkg. Dimensions (mm)3.1 x 4.4 x 1.0
Pkg. TypeTSSOP
Product CategoryFemtoClock, Ultra-Low Jitter Clocks (<300 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 840N051I is a LVCMOS/LVTTL clock synthesizer designed for SDH/SONET and Ethernet applications. The device generates a selectable 156.25MHz or 77.76MHz clock signal with excellent phase jitter performance. It uses Renesas' fourth generation FemtoClock® NG technology for an optimum of high clock frequency, low phase noise performance and low power consumption. The device supports 2.5V or 3.3V voltage supply and is packaged in a small, lead-free (RoHS 6) 8-lead TSSOP package. The extended temperature range supports wireless infrastructure, telecommunication, and networking end equipment requirements.