ICS845204中文資料瑞薩數(shù)據(jù)手冊(cè)PDF規(guī)格書(shū)

General Description

The ICS845204 is a 4 output PCI Express clock

synthesizer optimized to generate low jitter PCI

Express? reference clocks with or without spread

spectrum modulation and is a member of the

HiPerClockS? family of high performance clock

solutions from IDT. Spread type and amount can be configured via

the SSC control pins. Using a 25MHz, 18pF parallel resonant

crystal, the device will generate M-LVDS clocks at either 25MHz,

100MHz, 125MHz or 250MHz. The ICS845204 uses a low jitter

VCO that easily meets PCI Express jitter requirements and is

packaged in a 32-pin VFQFN package.

Features

? Four differential spread spectrum clock outputs

? Each output can be individually disabled by separate

output-enable inputs

? Crystal oscillator interface designed for 18pF,

25MHz parallel resonant crystal

? Supports the following output frequencies:

25MHz, 100MHz, 125MHz or 250MHz

? VCO range: 250MHz - 700MHz

? Supports SSC downspread at 0.05 and -0.75, centerspread

at ±0.25 and no spread options

? Cycle-to-cycle jitter: 50ps (maximum) design target

? Period jitter, RMS: TBD

? Full 3.3V output supply mode

? 0°C to 70°C ambient operating temperature

? Available in both standard (RoHS 5) and lead-free (RoHS 6)

packages