器件名称: ASM2I9942CG-32-ET
功能描述: Low Voltage 1:18 Clock Distribution Chip
文件大小: 431.82KB 共10页
简 介:May 2005 rev 0.2 Low Voltage 1:18 Clock Distribution Chip
Features
LVCMOS/LVTTL Clock Input 2.5V LVCMOS Outputs for Pentium IITM*
ASM2I9942C
device ideal for supplying clocks for a high performance Pentium II TM microprocessor based design. With a low output impedance (≈12), in both the HIGH and LOW logic states, the output buffers of the ASM2I9942C are ideal for driving series terminated transmission lines. With an output impedance of 12, the ASM2I9942C can drive two series terminated transmission lines from each output. This capability gives the ASM2I9942C an effective fanout of 1:36. The ASM2I9942C provides enough copies of low skew clocks for most high performance synchronous systems. The LVCMOS/LVTTL input of the ASM2I9942C provides a more standard LVCMOS interface. The OE pins will place the outputs into a high impedance state. The OE pin has an internal pullup resistor. The ASM2I9942C is a single supply device. The VCC power pins require either 2.5V or 3.3V. The 32–lead TQFP and LQFP package is chosen to optimize performance, board space and cost of the device. The 32–lead TQFP has a 7x7mm2 body size with a conservative 0.8mm pin spacing.
Microprocessor Support 150pS Maximum Targeted Output–to–Output Skew Maximum Output Frequency of 250MHz @ 3.3 VCC 32–Lead TQFP and LQFP Packaging Single 3.3V or 2.5V Supply. Pin and Function compatible to MPC942C.
Functional Description
The ASM2I9942C is a 1:18 low voltage clock distribution chip with 2.5V or 3.3V LVCMOS ou……
