Electronic Components Datasheet Search |
|
CY2277APAC-1M Datasheet(PDF) 1 Page - SpectraLinear Inc |
|
CY2277APAC-1M Datasheet(HTML) 1 Page - SpectraLinear Inc |
1 / 18 page Pentium®/II, 6x86, K6 Clock Synthesizer/Driver for Desktop/ Mobile PCs with Intel® 82430TX and 2 DIMMs or 3 SO-DIMMs CY2277A Rev 1.0, November 25, 2006 Page 1 of 18 2200 Laurelwood Road, Santa Clara, CA 95054 Tel:(408) 855-0555 Fax:(408) 855-0550 www.SpectraLinear.com Y2277A Features • Mixed 2.5V and 3.3V operation • Complete clock solution to meet requirements of Pentium®, Pentium® II, 6x86, or K6 motherboards — Four CPU clocks at 2.5V or 3.3V — Up to eight 3.3V SDRAM clocks — Seven 3.3V synchronous PCI clocks, one free running — Two 3.3V USB/IO clocks at 48 or 24 MHz, selectable by serial interface — One 2.5V IOAPIC clock at 14.318 MHz — Two 3.3V Ref. clocks at 14.318 MHz • Factory-EPROM programmable CPU, PCI, and USB/IO clock frequencies for custom configuration • Factory-EPROM programmable output drive and slew rate for EMI customization • MODE Enable pin for CPU_STOP and PCI_STOP • SMBus serial configuration interface • Available in space-saving 48-pin SSOP and TSSOP packages. Functional Description The CY2277A is a Clock Synthesizer/Driver for Pentium, Pentium II, 6X86, and K6 portable PCs designed with the Intel® 82430TX or similar chipsets. There are three available options as shown in the selector guide The CY2277A outputs four CPU clocks at 2.5V or 3.3V with up to nine selectable frequencies. There are up to eight 3.3V SDRAM clocks and seven PCI clocks, running at one half the CPU clock frequency. One of the PCI clocks is free-running. Additionally, the part outputs two 3.3V USB/IO clocks at 48 MHz or 24 MHz, one 2.5V IOAPIC clock at 14.318 MHz, and two 3.3V reference clocks at 14.318 MHz. The CPU, PCI, USB, and IO clock frequencies are factory-EPROM program- mable for easy customization with fast turnaround times. The CY2277A has power-down, CPU stop and PCI stop pins for power management control. The CPU stop and PCI stop are controlled by the MODE pin. They are multiplexed with SDRAM clock outputs, and are selected when the MODE pin is driven LOW. Additionally, these inputs are synchronized on-chip, enabling glitch-free transitions. When the CPU_STOP input is asserted, the CPU outputs are driven LOW. When the PCI_STOP input is asserted, the PCI outputs (except the free-running PCI clock) are driven LOW. Finally, when the PWR_DWN pin is asserted, the reference oscillator and PLLs are shut down, and all outputs are driven LOW. The CY2277A outputs are designed for low EMI emission. Controlled rise and fall times, unique output driver circuits and factory-EPROM programmable output drive and slew-rate enable optimal configurations for EMI control. . EPROM Pin Configuration Logic Block Diagram XTALOUT XTALIN IOAPIC (14.318 MHz) 14.318 MHz OSC. SDRAM[0–5] SEL SDRAM7/PCI_STOP VDDQ2 CPU PLL MODE SYS PLL /2 Delay 1 2 3 4 5 6 7 8 9 10 11 12 33 32 31 30 29 25 26 27 28 36 35 REF1 34 Top View 13 14 15 16 17 18 19 20 21 22 23 24 45 44 43 42 41 37 38 39 40 48 47 46 REF0 VSS XTALIN XTALOUT MODE VDDQ3 PCICLK_F PCICLK0 VSS PCICLK1 PCICLK2 PCICLK3 PCICLK4 VDDQ3 PCICLK5 VSS SEL SDATA SCLK VDDQ3 USBCLK/IOCLK USBCLK/IOCLK VSS AVDD PWR_SEL VDDQ2 IOAPIC PWR_DWN VSS CPUCLK0 CPUCLK1 VDDCPU CPUCLK2 CPUCLK3 VSS SDRAM0 SDRAM1 VDDQ3 SDRAM2 SDRAM3 VSS SDRAM4 SDRAM5 VDDQ3 SDRAM6/CPU_STOP SDRAM7/PCI_STOP AVDD SCLK SDATA REF [0–1] (14.318) CPUCLK[0–3] VDDCPU SDRAM6/CPU_STOP PCI[0–5] PCICLK_F USBCLK/IOCLK[0:1] STOP STOP INTERFACE CONTROL LOGIC SERIAL LOGIC LOGIC Divide and Mux Logic PWR_DWN |
Similar Part No. - CY2277APAC-1M |
|
Similar Description - CY2277APAC-1M |
|
|
Link URL |
Privacy Policy |
ALLDATASHEET.NET |
Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Contact us | Privacy Policy | Link Exchange | Manufacturer List All Rights Reserved©Alldatasheet.com |
Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
Family Site : ic2ic.com |
icmetro.com |