GENERAL DESCRIPTION

The 844031-01 is an Ethernet Clock Generator. The 844031-01

uses an 18pF parallel resonant crystal over the range of 19.6MHz

- 27.2MHz. For Ethernet applications, a 25MHz crystal is used to

generate 312.5MHz. The 844031-01 has excellent <1ps phase jitter

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

844031-01 is packaged in a small 8-pin TSSOP, making it ideal for

use in systems with limited board space.

FEATURES

• One differential LVDS output

• Crystal oscillator interface, 18pF parallel resonant crystal

(19.6MHz - 27.2MHz)

• Output frequency range: 245MHz - 340MHz

• VCO range: 490MHz - 680MHz

• RMS phase jitter @ 312.5MHz, using a 25MHz crystal

(1.875MHz - 20MHz): 0.53ps (typical)

• 3.3V or 2.5V operating supply

• 0°C to 70°C ambient operating temperature

• Available in lead-free (RoHS 6) package

• For functional replacement part use 8T49N242