Overview

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

Comparison

Applications

Documentation

Design & Development

Models