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AV9155 Scheda tecnica(PDF) 1 Page - Integrated Device Technology |
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AV9155 Scheda tecnica(HTML) 1 Page - Integrated Device Technology |
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1 / 11 page  Integrated Circuit Systems, Inc. General Description Features AV9155 Block Diagram 9155 Rev B 8/24/98 Low Cost 20-Pin Frequency Generator The AV9155 is a low cost frequency generator designed spe- cifically for desktop and notebook PC applications. Its CPU clocks provide all necessary CPU frequencies for 286, 386 and 486 systems, including support for the latest speeds of proces- sors. The device uses a 14.318 MHz crystal to generate the CPU and all peripheral clocks for integrated desktop motherboards. The dual 14.318 MHz clock outputs allows one output for the system and one to be the input to an ICS graphics frequency generator such as the AV9194. The CPU clock offers the unique feature of smooth, glitch-free transitions from one frequency to the next, making this ideal device to use whenever slowing the CPU speed. The AV9155 makes a gradual transition between frequencies, so that it obeys the Intel cycle-to-cycle timing specification for 486 systems. The simultaneous 2X and 1X CPU clocks offer controlled skew to within 1.5ns (max) of each other. ICS offers several versions of the AV9155.The different devices are shown below: Compatible with 286, 386, and 486 CPUs Supports turbo modes Generates communications clock, keyboard clock, floppy disk clock, system reference clock, bus clock and CPU clock Output enable tristates outputs Up to 100 MHz at 5V or 3.3V 20-pin DIP or SOIC All loop filter components internal Skew-controlled 2X and 1X CPU clocks Power-down option ICS has been shipping motherboard frequency generators sinceApril 1990, and is the leader in the area of multiple output clocks on a single chip. The AV9155 is a third generation device, and uses ICSs patented analog CMOS phase-locked loop technology for low phase jitter. ICS offers a broad family of frequency generators for motherboards, graphics and other applications, including cost-effective versions with only one or two output clocks. Consult ICS for all of your clock generation needs. Pentium is a trademark of Intel Corporation. PART DESCRIPTION AV9155C-01 Motherboard clock generator with 16 MHz BUS CLK AV9155C-02 Motherboard clock generator with 32 MHz BUS CLK AV9155C-23 Includes Pentium ™ frequencies AV9155C-36 Features a special 40 MHz SCSI clock |
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