ICS951462

Integrated Circuit Systems, Inc. ICS951462 Programmable System Clock Chip for ATI RS/RD690 - K8TM based Systems Recommended Application: ATI RS/RD690 systems using AMD K8 processors & SB600 Southbridge Output Features: 2 - pairs of CPU pairs 8 - pairs of SRC pairs 4 - pairs of ATIG pairs 1 - HyperTransport 66MHz clock seed 2 - 48MHz USB clock 3 - 14.318MHz Reference clock Key Specifications: CPU outputs cycle-to-cycle jitter < 85ps SRC outputs cycle-to-cycle jitter < 125ps ATIG outputs cycle-to-cycle jitter < 125ps +/- 300ppm frequency accuracy on CPU, SRC & ATIG clocks Features/Benefits: 3 - Programmable Clock Request pins for SRC and ATIG clocks ATIGCLKs are programmable for frequency Spread Spectrum for EMI reduction Outputs may be disabled via SMBus External crystal load capacitors for maximum frequency accuracy Functionality FS2 FS1 FS0 000 001 010 011 100 101 110 111 CPU MHz Hi-Z X/2 230.00 240.00 100.00 133.33 166.67 200.00 HTT MHz Hi-Z X/3 76.67 80.00 66.66 66.66 66.66 66.66 SRC M Hz 100.00 100.00 100.00 100.00 100.00 100.00 100.00 100.00 ATIG M Hz 100.00 100.00 100.00 100.00 100.00 100.00 100.00 100.00 USB M Hz 48.00 48.00 48.00 48.00 48.00 48.00 48.00 48.00 Pin Configuration GNDREF 1 64 FS0/REF0 VDDREF 2 63 FS1/REF1 X1 3 X2 4 62 FS2/REF2 61 PD** VDD48 5 48MHz_0 6 48MHz_1 7 60 VDDHTT 59 HTTCLK0 58 GNDHTT GND48 8 57 *CLKREQA# SMBCLK 9 56 CPUCLK8T0 SMBDAT 10 55 CPUCLK8C0 RESET_IN# 11 54 VDDCPU SRCCLKT7 12 53 G...