GENERAL DESCRIPTION
The 889474 is a high speed 2-to-1 differential multiplexer
with integrated 2 output LVDS fanout buffer and internal
termination and is a member of the family of high performance
clock solutions from IDT. The 889474 is optimized for
high speed and very low output skew, making it suitable
for use in demanding applications such as SONET,
1 Gigabit and 10 Gigabit Ethernet, and Fibre Channel. The internally
terminated differential input and VREF_AC pins allow other differential
signal families such as LVPECL, LVDS, LVHSTL and CML to be easily
interfaced to the input with minimal use of external components. The
889474 is packaged in a small 4mm x 4mm 24-pin VFQFN package
which makes it ideal for use in space-constrained applications.

FEATURES
• Two differential LVDS outputs
• INx, nINx pair can accept the following differential input levels:
LVPECL, LVDS, LVHSTL, CML
• 50Ω internal input termination to VT
• Maximum output frequency: 2GHz (maximum)
• Additive phase jitter, RMS: 0.06ps (typical)
• Output skew: 20ps (maximum)
• Propagation delay: 700ps (maximum)
• 2.5V operating supply
• -40°C to 85°C ambient operating temperature
• Available in lead-free RoHS-complaint package