General Description
The 845254 is a 3.3V/2.5V CML clock generator designed for
Ethernet applications. The device synthesizes either a 50MHz,
62.5MHz, 100MHz, 125MHz, 156.25MHz, 250MHz or 312.5MHz
clock signal with excellent phase jitter performance. The clock signal
is distributed to four low-skew differential CML outputs. The device is
suitable for driving the reference clocks of Ethernet PHYs. The
device supports 3.3V and 2.5V voltage supply and is packaged in a
small, lead-free (RoHS 6) 32-lead VFQFN package. The extended
temperature range supports telecommunication, wireless
infrastructure and networking end equipment requirements.

Features
• Clock generation of: 50MHz, 62.5MHz, 100MHz, 125MHz,
156.25MHz, 250MHz and 312.5MHz
• Four differential CML clock output pairs
• 25MHz reference clock (selectable internal crystal oscillator and
external LVCMOS clock)
• RMS phase jitter @ 125MHz, using a 25MHz crystal
(1.875MHz – 20MHz): 0.405ps (typical)
Offset Noise Power
100Hz.................... -104.6 dBc/Hz
1kHz.................... -118.4 dBc/Hz
10kHz................... -124.1 dBc/Hz
100kHz................... -125.3 dBc/Hz
• LVCMOS interface levels for the control inputs
• Full 3.3V and 2.5V supply voltage
• Available in lead-free (RoHS 6) 32 VFQFN package
• -40°C to 85°C ambient operating temperature
• Replacement part: 843002AYLF