General Description

The 843441 is a low jitter, high performance clock generator. The

843441 is designed for use in applications using the SAS and SATA

interconnect. The 843441 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

843441 features down and center spread spectrum (SSC) clocking

techniques.

特性 Features

? Designed for use in SAS, SAS-2, and SATA systems

? Center (±0.33) Spread Spectrum Clocking (SSC)

? Down (-0.30 or -0.60) SSC

? Better frequency stability than SAW oscillators

? One differential 3.3V LVPECL output

? Crystal oscillator interface designed for 25MHz

(CL = 18pF) frequency

? External fundamental crystal frequency ensures high reliability

and low aging

? Selectable output frequencies: 75MHz, 100MHz, 150MHz,

300MHz

? Output frequency is tunable with external capacitors

? RMS phase jitter: 1.33ps (typical)

? 3.3V operating supply

? 0°C to 70°C ambient operating temperature

? Industrial temperature available upon request

? Available in lead-free (RoHS 6) package

? 843441-150 Functional replacement part use 8T49N242i