General Description

The 9VRS4818B is a 1.5V Core main clock synthesizer

chip for AMD Fusion platform. An SMBus interface allows

full control of the device.

Recommended Application

Very Low Power Clock Generator for AMD Fusion II

Platforms

Input/Output Features

• Low power differential outputs with integrated series

resistors for Zo=50ohm systems

• 12 - Differential PCIe Gen2 SRC pairs w/dedicated

CLKREQ# pins

• 3 - Differential PCIe Gen2 SATA_DISPLAY pairs

w/microspread capability

• 2 - 48MHz USB clocks (180 degrees out of phase for EMI

reduction)

• 2 - 14.318MHz REF clock outputs

• 1 - 25MHz LAN clock output that can run from VDD

suspend rail

• 1 - CkPwrGd/WOL_STOP#

• 1 - VDD_SUSPEND pin

• 1- RESET_IN# pin

Features/Benefits

• 1.5V Core for minimal Power consumption

• Spread Spectrum for EMI reduction

• Outputs may be disabled via SMBus

• External crystal load capacitors for maximum frequency

accuracy

Key Specifications

• SRC/SATA_DISP output cycle-to-cycle jitter < 125ps

• 14.318MHz output cycle-to-cycle jitter < 200ps

• 48MHz output cycle-to-cycle jitter < 130ps

• SRC/SATA_DISP output phase jitter < 3.1ps rms (PCIe

Gen2)

• +/- 100ppm frequency accuracy on all clocks, (assuming

REF is trimmed to 0 ppm)

• 31.5KHz spread modulation frequency; passes USB3.0

compliance test