ICD2028

fax id: 35071ICD2028 ICD2028 PC Motherboard Clock Generator Features Eight independent clock outputs handle all clocking requirements for personal computer motherboards CPU clock frequency range: 10 MHz to 100 MHz with user-defined duty cycle Four user-configurable outputs Skew-free CPU clock, CPU clock ÷2, and buffered CPU clock options on configurable outputs Ideally suited for desktop PCs Phase-locked loop oscillator input derived from single 14.31818 MHz crystal Sophisticated internal loop-filter requires no external components Battery input maintains 32.768 kHz clock during power-down Three-state oscillator control disables outputs for test purposes 5V operation Low-power, high-speed CMOS technology Available in 20-pin SOIC package configuration Functional Description A modern personal computer motherboard often requires as many as seven different crystal can oscillators. The System Logic family of frequency synthesis parts from Cypress/IC Designs replaces the large number of oscillators required to build such multi-function motherboards. These parts synthesize all the required frequencies in a single monolithic device, thus lowering manufacturing costs and significantly reducing the printed circuit board space required. The ICD2028 is a second-generation PC Motherboard Clock Generator built on the foundation of the industry-standard and most widely-used ICD2023. The ICD2028 offers most of the features of the ICD2023, as well as some important...