MPC947

MOTOROLA SEMICONDUCTOR TECHNICAL DATA Low Voltage 1:9 Clock Distribution Chip The MPC947 is a 1:9 low voltage clock distribution chip. The device features the capability to select between two LVTTL compatible inputs and fans the signal out to 9 LVCMOS or LVTTL compatible outputs. These 9 outputs were designed and optimized to drive 50Ω series terminated transmission lines. With output–to–output skews of 500ps, the MPC947 is ideal as a clock distribution chip for synchronous systems which need a tight level of skew at a relatively low cost. For a similar www.DataSheet4U.com product targeted at a higher price/performance point, consult the MPC948 data sheet. MPC947 LOW VOLTAGE 1:9 CLOCK DISTRIBUTION CHIP Clock Distribution for PowerPC™ 620 L2 Cache 2 Selectable LVCMOS/LVTTL Clock Inputs 500ps Maximum Output–to–Output Skew Drives Up to 18 Independent Clock Lines Maximum Output Frequency of 110MHz Synchronous Output Enable Tristatable Outputs 32–Lead TQFP Packaging 3.3V VCC Supply Voltage FA SUFFIX 32–LEAD TQFP PACKAGE CASE 873A–02 With an output impedance of approximately 7Ω, in both the HIGH and LOW logic states, the output buffers of the MPC947 are ideal for driving series terminated transmission lines. More specifically, each of the 9 MPC947 outputs can drive two series terminated 50Ω transmission lines. With this capability, the MPC947 has an effective fanout of 1:18 in applications using point–to–point distribution schemes. With this level of fanout...