Features

• One selectable differential LVPECL output pair for DDR

533/400/667

• Six LVCMOS/ LVTTL outputs, 15Ω typical output impedance

- One selectable core clock for the processor

- One selectable clock for the PCI/ PCI-X bus

- One 125MHz clock reference for GbE MAC

- Three 25MHz clock references for GbE PHY

• Selectable external crystal or differential (single-ended) input

source

• Crystal oscillator interface designed for 25MHz, parallel resonant

crystal

• Differential input pair (CLK, nCLK) accepts LVPECL, LVDS,

LVHSTL, SSTL, HCSL input levels

• Internal resistor bias on nCLK pin allows the user to drive CLK

input with external single-ended (LVCMOS/ LVTTL) input levels

• RMS phase jitter @ 125MHz, using a 25MHz crystal

(1.875MHz - 20MHz): 0.78ps (typical), QD output

• Output supply:

LVPECL – 3.3V Core

LVCMOS –Core/Output

3.3V/3.3V

3.3V/2.5V

• -40°C to 85°C ambient operating temperature

• Available in lead-free (RoHS 6) package