ICS2572

Integrated Circuit Systems, Inc. ICS2572 User-Programmable Dual High-Performance Clock Generator Description The ICS2572 is a dual-PLL (phase-locked loop) clock generator with differential video outputs specifically designed for high-resolution, high-refresh rate, video applications. The video PLL generates any of 16 pre-programmed frequencies through selection of the address lines FS0-FS3. Similarly, the auxiliary PLL can generate any one of four pre-programmed frequencies via the MS0 & MS1 lines. A unique feature of the ICS2572 is the ability to redefine frequency selections after power-up. This permits complete set-up of the frequency table upon system initialization. Features Advanced ICS monolithic phase-locked loop technology Supports high-resolution graphics - differential CLK output to 185 MHz Divided dotclock output (LOAD) available Simplified device programming Sixteen selectable VCLK frequencies (all user re-programmable) Four selectable MCLK frequencies (all user re-programmable) Windows NT compatible Applications High end PC/low end workstation graphics designs requiring differential output X Terminal graphics Block Diagram XTAL1 XTAL2 Crystal Oscillator Reference Divider EXTFREQ /1, 4, 5 or 8 LOAD /2 PhaseFrequency Comparator Charge Pump VCO /4 CLK+ CLK- Prescaler /8 /M /A MCLK PLL (as above) /2 Strobe FS0 FS1 FS2 FS3 MS0 MS1 MCLK Set /8 VCLK Set & Program Mode Interface MCLK /4 ICS2572RevC090894 E-95 ICS2572 Pin Configuration XTA...