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