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ICS951411

System Clock Chip

ICS951411 PDF File

Description

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ICS951411 System Clock Chip for ATI RS400 P4TM-based Systems Recommended Application: ATI RS400 systems using Intel P4TM processors Output Features: • 6 - Pairs of SRC/PCI-Express clocks • 2 - Pairs of ATIG (SRC/PCI Express*) clocks • 3 - Pairs of Intel P4 clocks • 3 - 14.
318 MHz REF clocks • 1 - 48MHz USB clock • 1 - 33 MHz PCI clock seed Key Specifications: • CPU outputs cycle-cycle jitter < 85ps • SRC output cycle-cycle jitter <125ps • PCI outputs cycle-cycle jitter < 250ps • +/- 300ppm frequency accuracy on CPU & SRC clocks Features/Benefits: • 2- Programmable Clock Request pins for SRC clocks • Supports CK410 or CK409 frequency table mapping • Spread Spectrum for EMI reduction • Outputs may be disabled via SMBus • External crystal load capacitors for maximum frequency accuracy Functionality - (CK410# = 0) CPU SRC PCI FS_C1 FS_B1 FS_A1 MHz MHz MHz 0 266.
66 100.
00 33.
33 0 1 133.
33 100.
00 33.
33 0 0 200.
00 100.
00 33.
33 1 1 166.
66 100.
00 33.
33 0 333.
33 100.
00 33.
33 0 1 100.
00 100.
00 33.
33 1 0 400.
00 100.
00 33.
33 1 RESERVED 1 Functionality - (CK410# = 1) FS_C1 CPU Byte6 FS_B1 FS_A1 MHz bit5 0 1 0 1 0 1 0 1 0 0 1 1 0 0 1 1 100.
00 200.
00 133.
33 166.
67 200.
00 400.
00 266.
67 333.
33 SRC MHz 100.
00 100.
00 100.
00 100.
00 100.
00 100.
00 100.
00 100.
00 PCI MHz 33.
33 33.
33 33.
33 33.
33 33.
33 33.
33 33.
33 33.
33 Pin Configuration REF MHz 14.
318 14.
318 14.
318 14.
318 14.
318 14.
318 14.
318 14.
318 USB MHz 48.
000 48.
000 48.
000 48.
000 48.
000 48.
000 48.
000 48.
000 0 1 14.
318 14.
318 14.
318 14.
318 14.
318 14.
318 14.
318 14.
318 48.
000 48.
000 48.
000 48.
000 48.
000 48.
000 48.
000 48.
000 1.
FS_C, FS_B and FS_A are low-threshold inputs.
Please see the VIL_FS and VIH_FS specifications in the Input/Supply/Common Output Parameters Table for correct values.
Note: Pins preceeded by '**' have a 120 Kohm Internal Pull Down resistor Pins preceeded by '*' have a 120 Kohm Internal Pull Up resistor 56-pin SSOP & TSSOP 0891E—03/07/05 *Other names and ...

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