ICS83940

PRELIMINARY Integrated Circuit Systems, Inc. ICS83940 LOW SKEW, 1-TO-18 LVCMOS FANOUT BUFFER FEATURES 18 LVCMOS outputs, 23Ω typical output impedance Output frequency up to 200MHz 150ps output skew Part to part skew: 850ps Selectable LVCMOS or differential clock input LVTTL / LVCMOS clock select input Full 3.3V, 2.5V or mixed 3.3V, 2.5V supply modes 0°C to 70°C ambient operating temperature Industrial temperature information available upon request GENERAL DESCRIPTION The ICS83940 is a low skew, 1-to-18 Fanout Buffer and a member of the HiPerClockS™ HiPerClockS™ family of High Performance Clock Solutions from ICS. The low impedance LVCMOS outputs are designed to drive 50Ω series or parallel terminated transmission lines. The effective fanout can be increased from 18 to 36 by utilizing the ability of the outputs to drive two series terminated lines. The differential clock input is designed to accept any differential input levels www.DataSheet4U.com including LVPECL. ,&6 The ICS83940 is characterized at full 3.3V, full 2.5V and mixed 3.3V input and 2.5V output operating supply modes. Guaranteed output and part-to-part skew characteristics make the ICS83940 ideal for those clock distribution applications demanding well defined performance and repeatability. BLOCK DIAGRAM PIN ASSIGNMENT VDDO GND Q0 Q1 Q2 Q3 Q4 Q5 CLK_SEL CLK0 nCLK0 LVCMOS_CLK GND Q0 1 32 31 30 29 28 27 26 25 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 Q17 Q16 Q15 GND Q14 Q13 Q12 VDDO 24 23 ...