843442I中文资料FemtoClock SAS/SATA Clock Generator数据手册Renesas规格书

描述 Description

The 843442I is a low jitter, high performance clock generator and a member of the FemtoClock™ family of silicon timing products. The 843442I is designed for use in applications using the SAS and SATA interconnect. The 843442I uses an external, 25MHz, parallel resonant crystal to generate two selectable output frequencies: 75MHz and 150MHz. This silicon based approach provides excellent frequency stability and reliability. The 843442I 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
Two differential 3.3V LVPECL output pairs
Crystal oscillator interface designed for 25MHz (CL = 18pF) frequency
External fundamental crystal frequency ensures high reliability and low aging
Selectable output frequencies: 75MHz, 150MHz
Output frequency is tunable with external capacitors
RMS phase jitter at 150MHz (integrated from 12kHz to 20MHz): 1.07ps (typical)
3.3V operating supply
-40°C to 85°C ambient operating temperature
Available in lead-free (RoHS 6) package