844441I数据手册Renesas中文资料规格书

描述 Description

The 844441I is a low jitter, high performance clock generator and a member of the FemtoClock® family of silicon timing products. The 844441I is designed for use in applications using the SAS and SATA interconnect. The 844441I uses an external, 25MHz, parallel resonant crystal to generate four selectable output frequencies: 75MHz, 100MHz, 150MHz, and 300MHz. This silicon based approach provides excellent frequency stability and reliability. The 844441I features down and center spread spectrum (SSC) clocking techniques.

特性 Features

Designed for use in SAS, SAS-2, and SATA systems
Center (±0.25%) Spread Spectrum Clocking (SSC)
Down (-0.23% or -0.5%) SSC
Better frequency stability than SAW oscillators
One differential 2.5V LVDS output
Crystal oscillator interface designed for 25MHz (CL = 18pF) frequency
External fundamental crystal, ensures high reliability and low aging
Selectable output frequencies: 75MHz, 100MHz, 150MHz, 300MHz
Output frequency is tunable with external capacitors
RMS phase jitter @ 100MHz, using a 25MHz crystal (12kHz – 20MHz): 1.1936ps (typical)
2.5V operating supply
-40°C to 85°C ambient operating temperature
Available in lead-free (RoHS 6) packages