Skip to main content
FemtoClock SAS/SATA Clock Generator

Package Information

Lead Count (#) 8
Pkg. Code DCG8
Pitch (mm) 1.27
Pkg. Type SOIC
Pkg. Dimensions (mm) 4.9 x 3.9 x 1.5

Environmental & Export Classifications

Moisture Sensitivity Level (MSL) 1
Pb (Lead) Free Yes
ECCN (US) NLR
HTS (US) 8542390000

Product Attributes

Lead Count (#) 8
Carrier Type Tube
Moisture Sensitivity Level (MSL) 1
Qty. per Reel (#) 0
Qty. per Carrier (#) 97
Pb (Lead) Free Yes
Pb Free Category e3 Sn
Temp. Range 0 to 70°C
Advanced Features Spread Spectrum
Core Voltage (V) 2.5, 3.3
Feedback Input No
Input Freq (MHz) 25 - 25
Input Type Crystal
Inputs (#) 1
Length (mm) 4.9
MOQ 97
Output Banks (#) 1
Output Freq Range (MHz) 75 - 75
Output Type LVPECL
Output Voltage (V) 2.5, 3.3
Outputs (#) 1
Package Area (mm²) 19.1
Phase Jitter Typ RMS (ps) 0.734
Pitch (mm) 1.27
Pkg. Dimensions (mm) 4.9 x 3.9 x 1.5
Pkg. Type SOIC
Prog. Clock No
Reference Output No
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

Description

The 843751 is a low jitter, high performance clock generator. The 843751 is designed for use in the SAS-2 interconnect and the three transport protocols that use the SAS-2 interconnect: Serial SCSI Protocol (SSP), Serial ATA Tunneled Protocol (STP), and Serial Management Protocol (SMP). The 843751 has excellent (<1ps) RMS phase jitter, over the SAS defined integration range. The 843751 uses an external, 25MHz, parallel resonant crystal to generate 75MHz. This silicon based approach provides excellent frequency stability and reliability. The 843751 features up, down, and center spread spectrum (SSC) clocking techniques. The up, down and center SSC will be required in the SAS-2 applications that have three clock trees in the HBA and expander ASICs.