ASM2I99448

May 2005 ASM2I99448 rev 0.3 3.3V/2.5V LVCMOS 1:12 Clock Fanout Buffer Features ƒ 12 LVCMOS compatible clock outputs ƒ Selectable LVCMOS and differential LVPECL compatible clock inputs ƒ Maximum clock frequency of 350MHz ƒ Maximum clock skew of 150pS ƒ Synchronous output stop in logic low state eliminates output runt pulses ƒ High–impedance output control ƒ 3.3V or 2.5V power supply ƒ Drives up to 24 series terminated clock lines ƒ Ambient temperature range –40°C to +85°C ƒ 32–Lead LQFP & TQFP packaging ƒ Supports clock distribution in networking, telecommunication and computing applications ƒ Pin and Function compatible to MPC9448 and MPC948 Functional Description The ASM2I99448 is a 3.3V or 2.5V compatible, 1:12 clock fanout buffer targeted for high performance clock tree applications. With output frequencies up to 350 MHz and output skews less than 150 pS, the device meets the needs of most demanding clock applications. The ASM2I99448 is specifically designed to distribute LVCMOS compatible clock signals up to a frequency of 350MHz. Each output provides a precise copy of the input signal with a near zero skew. The outputs buffers support driving of 50Ω terminated transmission lines on the incident edge: each output is capable of driving either one parallel terminated or two series terminated transmission lines. Two selectable, independent clock inputs are available, providing support of LVCMOS and differential LVPECL clock distribution systems. The ASM2I99448 CLK_STOP ...