General Description
The 8T49N4811 is a highly flexible FemtoClock® NG
pin-programmable clock generator suitable for networking and
communications applications. It is able to generate five different
output frequencies with multiple copies of each. A fundamental mode
crystal, single-ended, or differential input reference may be used as
the source for the output frequency.
The use of pin-programming to select the input source / frequency,
desired output frequencies and output styles allow a single device to
be used in a wide variety of applications without the need for register
programming.
Selection pins use 3-level options to maximize flexibility while
minimizing package size. Selection is performed by tying a selection
pin high or low or by leaving it floating, eliminating the need for
passive components to drive a desired logic level.

Features
• Fourth generation FemtoClock® NG technology
• Generates multiple copies of 25MHz, 50MHz, 100MHz, 125MHz,
156.25MHz or 312.5MHz
• Typical input frequency is 25MHz, with optional 125MHz and
156.25MHz input support
• Differential outputs are pin programmable for LVDS or LVPECL
• RMS phase jitter at 156.25MHz: <300fs typical
• Power Supply Rejection Ratio better than -50dBc from
10k-1.5MHz at 3.3V power supply
• Full 3.3V and 2.5V Supply Voltages
• -40°C to +85°C ambient operating temperature
• 56-pin VFQFPN, lead-free (RoHS 6) packaging