General Description
The 843021 is a Gigabit Ethernet Clock Generator. The ICS84302
uses a 25MHz crystal to synthesize 125MHz. The 843021has
excellent phase jitter performance, over the 1.875MHz – 20MHz
integration range. The 843021is packaged in a small 8-pin TSSOP,
making it ideal for use in systems with limited board space.

Features
• One differential 3.3V LVPECL output
• Crystal oscillator interface designed for 22.4MHz – 28MHz, 18pF
parallel resonant crystal
• Output frequency range: 112MHz – 140MHz
• VCO range: 560MHz – 700MHz
• Output duty cycle range: 49% – 51%
• RMS phase jitter at 125MHz, using a 25MHz crystal
(1.875MHz – 20MHz): 0.650ps (typical)
Offset Noise Power
100Hz..............-94.2 dBc/Hz
1kHz..............-122.8 dBc/Hz
10kHz..............-132.2 dBc/Hz
100kHz..............-131.3 dBc/Hz
• Full 3.3V supply mode
• 0°C to 70°C ambient operating temperature
• Available in lead-free (RoHS 6) package
• Industrial temperature information available upon request