General Description

The 9VRS4339B is a Intel CK-NET compatible main clock

for Intel Netbooks, conforming to the CK-NET specification.

It is driven with a 25MHz crystal and generates a variety of

clocks, including an LCD clock. An SMBus interface allows

full control of the device.

Output Features

• 2 – 0.8V push-pull differential CPU pairs

• 5 – 0.8V push-pull differential SRC pairs

• 1 – 0.8V push-pull differential SATA pair

• 1 – 0.8V push-pull differential DOT96/SRC pair

• 1 – 0.8V push-pull differential LCD100 pair

• 1 – 0.8V push-pull differential CPU_ITP/SRC pair

• 2 – PCI (33MHz)

• 1 – PCI_F, (33MHz) free-running

• 1 – USB_48MHz

• 1 – 48MHz

• 1 – 25MHz

• 1 – 27MHz/PCI

• 1 – 14.318MHz

Features/Benefits

• Supports Wake_On_LAN (see pin55 pin description)

• Selectable spread on CPU, SRC, PCI; Supports

margining

• Uses external 25MHz crystal, external crystal load caps

are required for frequency tuning

• CLKREQ# pins; Support SRC power management

• Low power differential clock outputs driving 100 ohm

differential traces; reduced powe

• Integrated 33 ohm series resistors on all differential

outputs; reduced board space

Key Specifications

• CPU outputs cycle-to-cycle jitter <85ps

• SRC cycle-to-cycle jitter <85ps

• SRC meets PCIEX Gen2 specifications

• SATA outputs cycle-to-cycle jitter <125ps

• PCI outputs cycle-to-cycle jitter <500ps

• ±100ppm frequency accuracy on all clocks