Skip to main content
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/LVCMOS-to-LVDS/LVCMOS Frequency Synthesizer

Package Information

Pkg. Type:VFQFPN
Pkg. Code:NLG32
Lead Count (#):32
Pkg. Dimensions (mm):5.0 x 5.0 x 0.9
Pitch (mm):0.5

Environmental & Export Classifications

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

Product Attributes

Pkg. TypeVFQFPN
Lead Count (#)32
Pb (Lead) FreeYes
Carrier TypeTray
Core Voltage (V)3.3
Feedback InputNo
Input Freq (MHz)25 - 25
Input TypeCrystal, LVCMOS
Inputs (#)2
Length (mm)5
MOQ490
Moisture Sensitivity Level (MSL)3
Output Banks (#)2
Output Freq Range (MHz)3.90625 - 3.90625, 125 - 125
Output TypeLVCMOS, LVDS
Output Voltage (V)2.5
Outputs (#)9
Package Area (mm²)25
Pb Free Categorye3 Sn
Phase Jitter Typ RMS (ps)0.41
Pitch (mm)0.5
Pkg. Dimensions (mm)5.0 x 5.0 x 0.9
Prog. ClockNo
Qty. per Carrier (#)490
Qty. per Reel (#)0
Requires Terms and ConditionsDoes not require acceptance of Terms and Conditions
Tape & ReelNo
Temp. Range (°C)0 to 70°C
Thickness (mm)0.9
Width (mm)5

Description

The 8440259-05 is a 9 output synthesizer optimized to generate Gigabit and 10 Gigabit Ethernet clocks. Using a 25MHz, 18pF parallel resonant crystal, the device will generate 125MHz and 3.90625MHz clocks with mixed LVDS and LVCMOS/LVTTL output levels. The 8440259-05 uses IDT's 3rd generations low phase noise VCO technology and can achieve <1ps typical rms phase jitter, easily meeting Ethernet jitter requirements. The 8440259-05 is packaged in a small, 32-pin VFQFN package that is optimum for applications with space limitations.