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FS6261-01 Datasheet

Part Number FS6261-01
Manufacturers AMI
Logo AMI
Description Motherboard Clock Generator
Datasheet FS6261-01 DatasheetFS6261-01 Datasheet (PDF)

www.DataSheet4U.com      X  T 0RWKHUERDUG &ORFN *HQHUDWRU ,& )6 January 2000 1.0 • ♦ ♦ ♦ ♦ ♦ ♦ ♦ • • • • Features ® 2.0 Description Generates clocks required for Intel i820 based desktop and workstation systems, including: Four enabled 2.5V 133/100MHz CPU Front Side Bus (FSB) clocks Two 2.5V CPU/2 clocks for synchronous memory Seven enabled 3.3V PCI bus clocks and one free-running PCI clock Four enabled 3.3V 66MHz AGP clocks Three 2.5V 16.67MHz APIC bus clocks Tw.

  FS6261-01   FS6261-01






Motherboard Clock Generator

www.DataSheet4U.com      X  T 0RWKHUERDUG &ORFN *HQHUDWRU ,& )6 January 2000 1.0 • ♦ ♦ ♦ ♦ ♦ ♦ ♦ • • • • Features ® 2.0 Description Generates clocks required for Intel i820 based desktop and workstation systems, including: Four enabled 2.5V 133/100MHz CPU Front Side Bus (FSB) clocks Two 2.5V CPU/2 clocks for synchronous memory Seven enabled 3.3V PCI bus clocks and one free-running PCI clock Four enabled 3.3V 66MHz AGP clocks Three 2.5V 16.67MHz APIC bus clocks Two 3.3V 14.318MHz REF clocks One 3.3V 48MHz USB clock The FS6261-01 is a CMOS clock generator IC designed for high-speed motherboard applications. Two different frequencies can be selected for the CPU clocks via two SEL pins. Glitch-free stop clock control of the CPU, AGP (66MHz) and PCI clocks is provided. A low current power-down mode is available for mobile applications. Separate clock buffers provide for a 2.5V voltage range on the CPU_0:3, CPU/2_0:1 and APIC_0:2 clocks. Figure 2: Pin Configuration VSS_R REF_0 REF_1 VDD_R XIN XOUT VSS_P PCI_F PCI_1 VDD_P PCI_2 PCI_3 VSS_P PCI_4 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 56 55 54 53 52 51 50 49 48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33 32 31 30 29 VDD_A APIC_2 APIC_1 APIC_0 VSS_A VDD_C2 CPU/2_1 CPU/2_0 VSS_C2 VDD_C CPU_3 CPU_2 VSS_C VDD_C CPU_1 CPU_0 VSS_C VDD VSS PCI_STOP# CPU_STOP# PWR_DWN# SS_EN# SEL_1 SEL_0 VDD_48 CK48 VSS_48 CPU clock cycle – cycle jitter < 150ps p-p Non-linear spread-sp.


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