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RC7144 Datasheet

  • RC7144

  • CPU System Clock Generator

  • 16頁(yè)

  • ETC

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www.fairchildsemi.com
RC7144
133MHz Spread Spectrum Motherboard Integrated
Clock/Buffer
Features
鈥?Employs Fairchild鈥檚 proprietary Spread Spectrum
Technology
鈥?Reduces measured EMI by as much as 10dB
鈥?Supports up to 150MHz
樓
I
2
C programmable
鈥?Two copies of CPU clock with one free running
鈥?One copy 24MHz clock
鈥?One copy 48MHz clock
鈥?One copy IOAPIC
鈥?Two copy REF 14.318MHz clock (3.3V)
鈥?Six copies PCI clock
鈥?Thirteen copies of SDRAM clock with one free running
鈥?PCI/CPU stop capability
Description
The RC7144 is a clock synthesizer for motherboard applica-
tions. It meets the requirements for the 133MHz 13x/zx
chipset. The clock frequencies can be set with the 4 select
pins or can be set via the I
2
C interface.
Preliminary Information
Block Diagram
X1
X2
XTAL
OSC
REF1/FS2
REF0/PCI_STOP#
IOAPIC
PLL1
Spread
Spectrum
PLL2 USB
SDRAMIN
SCL
SDA
I2C
Registers
C
O
N
T
R
O
L
L
O
G
I
C
CPU1
CPU_F
PCI_F/MODE
PCI1/FS3
PCI2:5
SDRAM_F
SDRAM0:11
CLK_STOP#
24MHz/FS1
48MHz/FS0
I
2
C is a trademark of Philips Corporation
Rev. 0.8.2
Preliminary Specification describes products that are not in full production at the time of printing. Specifications are based on design goals and
limited characterization. They may change without notice. Contact Fairchild Semiconductor for current information.

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