General Description
The 840N022 is a LVCMOS/LVTTL clock synthesizer designed for
Ethernet applications. The device generates a selectable 125MHz or
62.5MHz clock signal with excellent phase jitter performance. The
device uses IDT’s fourth generation FemtoClock® NG technology
for an optimum of high clock frequency, low phase noise
performance and low power consumption.The device supports 2.5V
or 3.3V voltage supply and is packaged in a small, lead-free (RoHS
6) 8-lead TSSOP package. The extended temperature range
supports wireless infrastructure, telecommunication, and networking
end equipment requirements

Features
• Fourth generation FemtoClock® NG technology
• 125MHz output clock synthesized from a 25MHz fundamental
mode crystal
• One LVCMOS/LVTTL clock output
• Crystal interface designed for a 12pF parallel resonant crystal
• RMS phase jitter @ 125MHz, using a 25MHz crystal
(1.875MHz - 20MHz): 0.148ps (maximum)
• RMS phase jitter @ 125MHz, using a 25MHz crystal
(12kHz - 20MHz): 0.479ps (maximum)
• LVCMOS interface levels for the control inputs
• Full 2.5V or 3.3V supply voltage
• Lead-free (RoHS 6) packaging
• -40°C to 85°C ambient operating temperature
• Use replacement part: 840N202CKI-dddLF