Package Information
| CAD Model: | View CAD Model |
| Pkg. Type: | SOIC |
| Pkg. Code: | DCG8 |
| Lead Count (#): | 8 |
| Pkg. Dimensions (mm): | 4.9 x 3.9 x 1.5 |
| Pitch (mm): | 1.27 |
Environmental & Export Classifications
| Moisture Sensitivity Level (MSL) | 1 |
| Pb (Lead) Free | Yes |
| ECCN (US) | EAR99 |
| HTS (US) | 8542.39.0090 |
Product Attributes
| Lead Count (#) | 8 |
| Carrier Type | Tube |
| Moisture Sensitivity Level (MSL) | 1 |
| Pb (Lead) Free | Yes |
| Pb Free Category | e3 Sn |
| Temp. Range (°C) | 0 to 70°C |
| Advanced Features | Programmable Clock, Spread Spectrum, Reference Output |
| Core Voltage (V) | 3.3 |
| Family Name | VersaClock |
| Input Freq (MHz) | 3 - 150 |
| Input Type | Crystal, LVCMOS |
| Inputs (#) | 1 |
| Length (mm) | 4.9 |
| MOQ | 291 |
| Output Banks (#) | 1 |
| Output Freq Range (MHz) | 0.314 - 200 |
| Output Type | LVCMOS |
| Output Voltage (V) | 3.3 |
| Outputs (#) | 1 |
| Package Area (mm²) | 19.1 |
| Period Jitter Typ P-P (ps) | 200 |
| Phase Jitter Typ RMS (fs) | 50000 |
| Phase Jitter Typ RMS (ps) | 50 |
| Pitch (mm) | 1.27 |
| Pkg. Dimensions (mm) | 4.9 x 3.9 x 1.5 |
| Pkg. Type | SOIC |
| Prog. Clock | Yes |
| Prog. Interface | OTP |
| Published | No |
| Qty. per Carrier (#) | 97 |
| Qty. per Reel (#) | 0 |
| Reference Output | Yes |
| Requires Terms and Conditions | Does not require acceptance of Terms and Conditions |
| Spread Spectrum | Yes |
| Tape & Reel | No |
| Thickness (mm) | 1.5 |
| Width (mm) | 3.9 |
Resources for 251
Description
The 251 is a low cost, single-output, field programmable clock synthesizer. The 251 can generate an output frequency from 314 kHz to 200 MHz and may employ Spread Spectrum techniques to reduce system electro-magnetic interference (EMI). Using IDT's VersaClock™ software to configure the PLL and output, the 251 contains a One-Time Programmable (OTP) ROM to allow field programmability. Programming features include 4 selectable configuration registers. The device employs Phase-Locked Loop (PLL) techniques to run from a standard fundamental mode, inexpensive crystal, or clock. It can replace multiple crystals and oscillators, saving board space and cost. The device also has a power-down feature that tri-states the clock outputs and turns off the PLLs when the PDTS pin is taken low. The 251 is also available in factory programmed custom versions for high-volume applications.