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: | TSSOP |
| Pkg. Code: | PGG8 |
| Lead Count (#): | 8 |
| Pkg. Dimensions (mm): | 3.1 x 4.4 x 1.0 |
| Pitch (mm): | 0.65 |
| Moisture Sensitivity Level (MSL) | 1 |
| Pb (Lead) Free | Yes |
| ECCN (US) | EAR99 |
| HTS (US) | 8542.39.0090 |
| Lead Count (#) | 8 |
| Carrier Type | Reel |
| Moisture Sensitivity Level (MSL) | 1 |
| Qty. per Reel (#) | 2500 |
| Qty. per Carrier (#) | 0 |
| Pb (Lead) Free | Yes |
| Pb Free Category | e3 Sn |
| Temp. Range (°C) | -40 to 85°C |
| Core Voltage (V) | 2.5V, 3.3V |
| Feedback Input | No |
| Input Freq (MHz) | 19.2 - 19.2, 19.44 - 19.44, 19.5312 - 19.5312 |
| Input Type | Crystal |
| Inputs (#) | 1 |
| Length (mm) | 3.1 |
| MOQ | 2500 |
| 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 Type | LVCMOS |
| 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. Type | TSSOP |
| Product Category | FemtoClock, Ultra-Low Jitter Clocks (<300 fs RMS) |
| Prog. Clock | No |
| Reel Size (in) | 13 |
| Reference Output | No |
| Requires Terms and Conditions | Does not require acceptance of Terms and Conditions |
| Spread Spectrum | No |
| Tape & Reel | Yes |
| Thickness (mm) | 1 |
| Width (mm) | 4.4 |
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.