GENERAL DESCRIPTION

The 843251I-14 is a 10Gb Ethernet Clock Generator. The

843251I-14 uses an 18pF parallel resonant crystal over the

range of 22.4MHz - 27.2MHz. For Ethernet applications, a

25MHz crystal is used. The device has excellent <1ps phase

jitter performance, over the 1.875MHz - 20MHz integration range.

The 843251I-14 is packaged in a small 8-pin TSSOP, making

it ideal for use in systems with limited board space. NOTE: It is

not recommended to overdrive the crystal input with an external

clock.

FEATURES

• One Differential LVPECL output

• Crystal oscillator interface, 18pF parallel resonant crystal

(22.4MHz - 27.2MHz)

• Output frequency ranges:

FREQ_SEL = 1: 560MHz to 680MHz

FREQ_SEL = 0: 140MHz to 170MHz

• VCO range: 560MHz - 680MHz

• RMS phase jitter @ 156.25MHz, using a 25MHz crystal

(1.875MHz - 20MHz): 0.49ps (typical) @ 3.3V

• 3.3V or 2.5V operating supply

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

• Available in lead-free (RoHS 6) package