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.
| CAD Model: | View CAD Model |
| Pkg. Type: | VFQFPN |
| Pkg. Code: | NLG32 |
| Lead Count (#): | 32 |
| Pkg. Dimensions (mm): | 5.0 x 5.0 x 0.9 |
| Pitch (mm): | 0.5 |
| Moisture Sensitivity Level (MSL) | 3 |
| Pb (Lead) Free | Yes |
| ECCN (US) | EAR99 |
| HTS (US) | 8542.39.0090 |
| Lead Count (#) | 32 |
| Carrier Type | Tray |
| Moisture Sensitivity Level (MSL) | 3 |
| Qty. per Reel (#) | 0 |
| Qty. per Carrier (#) | 490 |
| Pb (Lead) Free | Yes |
| Pb Free Category | e3 Sn |
| Temp. Range (°C) | -40 to 85°C |
| Core Voltage (V) | 3.3 |
| Feedback Input | No |
| Input Freq (MHz) | 25 - 25 |
| Input Type | Crystal, LVCMOS |
| Inputs (#) | 2 |
| Length (mm) | 5 |
| MOQ | 490 |
| Output Banks (#) | 3 |
| Output Freq Range (MHz) | 3.90625 - 3.90625, 125 - 125, 156.25 - 156.25 |
| Output Type | LVCMOS, LVDS |
| Output Voltage (V) | 3.3 |
| Outputs (#) | 9 |
| Package Area (mm²) | 25 |
| Phase Jitter Typ RMS (ps) | 0.45 |
| Pitch (mm) | 0.5 |
| Pkg. Dimensions (mm) | 5.0 x 5.0 x 0.9 |
| Pkg. Type | VFQFPN |
| Product Category | FemtoClock, Low Jitter Clocks (<700 fs RMS) |
| Prog. Clock | No |
| Reference Output | No |
| Requires Terms and Conditions | Does not require acceptance of Terms and Conditions |
| Spread Spectrum | No |
| Tape & Reel | No |
| Thickness (mm) | 0.9 |
| Width (mm) | 5 |
The 8440259I-45 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 156.25MHz, 125MHz, and 3.90625MHz clocks with mixed LVDS and LVCMOS/ LVTTL output levels. The 8440259I-45 uses Renesas' third generation low phase noise VCO technology and can achieve <1ps typical RMS phase jitter, easily meeting Ethernet jitter requirements. The 8440259I-45 is packaged in a small, 5mm x 5mm VFQFN package that is optimum for applications with space limitations.