PLL52C61-21HA Datasheet | PhaseLink

PLL52C61-01HA/-21HA Pentium/SDRAM Clock Generator with Integrated Buffers Features n Generates all clock frequencies for Pentium, AMD and Cyrix system requiring multiple CPU clocks (SDRAM, Shared memory architecture). n Supports up to12 Synchronous CPU clocks. n 6 PCI BUS clocks selectable between synchronous and asynchronous mode. n One 14.318Mhz reference clock n One 24Mhz floppy clock and one 48Mhz USB clock. n Proven power-on strapping techniques to minimize four input pins. In any cases, no glitches will be produced from the output pins during power on. n 3.3V and 5V operation. n Available in 300mil 28 pin SOIC and 32 pin SOJ. DESCRIPTION The PLL52C61-01HA and -21HA are high performance system clock generators designed to support INTEL 430VX PCIset’s motherboard with SDRAM Pentium based systems. All output clocks skew and jitter performance are designed to be fully pliant with INTEL Pentium CPU timing requirements. TIMING SPECIFICATIONS PCLK-PCLK skew PCLK-BCLK skew PCLK,BCLK slew rate PCLK Jitter <250 ps 1~5 ns (PCLK leads) > 1 V/ns (0.4 ~2.4V) ±200 ps cycle-cycle BLOCK DIAGRAM PIN INFORMATION FREQUENCY SELECTION (MHz) F2 F1 F0 PCLK (0:11) BCLK(0:5) PCI=1 PCI=0 0 0 0 50 25 32 0 0 1 60 30 32 0 1 0 66.6 33.3 32 0 1 1 Test Test Test 55 27.5 32 75 37.5 32 1 1 0 83.3 41.7 32 1 1 1 68.4 34.2 32 Note: F2,F1,F0 and PCI are selectable only during Power-on. They are HIGH by default and Low when 10K Ω pull-down is attached. 45437 Warm Springs Blvd., Fremont, CALIFORNIA, TEL 510-492-0990 FAX 510-492-0991 9702.Rev.1A Page...