GENERAL DESCRIPTION

The 844021-01 is an Ethernet Clock Generator. The 844021-01

uses an 18pF parallel resonant crystal over the range of 24.5MHz

– 34MHz. For Ethernet applications, a 25MHz crystal is used. The

844021-01 has excellent <1ps phase jitter performance, over the

1.875MHz – 20MHz integration range. The 844021-01 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

(24.5MHz – 34MHz)

• Output frequency range: 122.5MHz – 170MHz

• VCO range: 490MHz – 680MHz

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

(1.875MHz – 20MHz): 0.32ps (typical) @ 3.3V

• 3.3V or 2.5V operating supply

• 0°C to 70°C ambient operating temperature

• Available in lead-free (RoHS 6) package