AV9155C-44 Datasheet | Integrated Circuit Systems

Description The AV9155C-44 is a low cost frequency generator designed specifically for desktop and notebook PC applications with either 3.3V or 5.0V power supply voltage. Its CPU clocks provide all necessary CPU frequencies for 286, 386 and 486 systems, including support for the latest speeds of processors. 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, glitchfree transitions from one frequency to the next, making this ideal device to use whenever slowing the CPU speed. The AV9155C-44 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. Features • • • • • • • • • patible with 286, 386, and 486 CPUs Supports turbo modes Generates munications 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 ponents internal Skew-controlled 2X and 1X CPU clocks Power-down option Pin Configuration Block Diagram 20-Pin DIP or SOIC THIS DATA SHEET (AV9155C-44) IS AN ADDENDUM TO THE EXISTING AV9155C DATA SHEET. ALL INFORMATION IN THIS DATA SHEET SUPERSEDES THE DATA FOUND IN THE ORIGINAL AV9155C DATA SHEET. 9155-44 Rev D 02/12/98 ICS reserves the right to make changes in the device data identified in this publication without further notice. ICS advises its customers to obtain the latest version of all device data to verify that any information being relied upon by the customer is current and accurate. Pin Descriptions for AV9155C-44 PIN NUMBER 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 PIN...