CY22K7
133-MHz Spread Spectrum Clock Generator For Use With
the AMD-K7
廬
Processor and AMD-750 Chipset
Features
Benefits
鈥?Multiple output clocks running at different frequencies
Main clock generator for PC motherboard designs using the
鈥?Three open-drain differential CPU outputs running up
AMD-K7 processor and AMD-750 Chipset
to 133 MHz
鈥?Supports up to two CPUs and chipset
鈥?Eight 3.3V synchronous PCI clocks (one free running)
鈥?Support for 4 PCI slots and chipset
鈥?Two 3.3V AGP clocks at 2xPCI
鈥?Supports designs using AGP
鈥?One dedicated 3.3V USB clock at 48 MHz
鈥?Supports designs using USB
鈥?One 3.3V USB/IO clock at 48 MHz or 24 MHz, selectable
鈥?Allows for one additional USB output or support for I/O
via power-on latch input
chip from various vendors
鈥?One 3.3V SDRAM clock output running at the CPU fre-
鈥?Supports SDRAM memory architecture with external
quency
PLL buffer
鈥?Two 3.3V Reference clocks at 14.318 MHz
鈥?Supports ISA slots and I/O chip
鈥?Spread Spectrum clocking
鈥?33 kHz modulation frequency
鈥?/div>
鈭?.6%
downspread margin
鈥?Dedicated inputs for various functions
鈥?PCI_STOP
鈥?CPU_STOP
鈥?PWR_DWN
鈥?SPREAD
鈥?TEST
鈥?USB/IO
鈥?FS [0:1]
鈥?I
2
C interface
鈥?48-Pin SSOP package
EMI reduction
Provides system design flexibility and power management
鈥?Stops all PCI clocks (except PCICLK_F0) when LOW
鈥?Stops all CPU clocks when LOW
鈥?Power is removed from internal logic when LOW
鈥?Activates Spread Spectrum for lower EMI
鈥?Used to enter Test Mode
鈥?Selects USB or SuperIO Clock
鈥?Power-on latched inputs for frequency select options
Dynamic control of output clock signals via SMBus
Industry-standard package provides cost and space savings
Logic Block Diagram
XTALIN
XTALOUT
CPU_STOP
SPREAD
CPU PLL
STOP
LOGIC
14.318 MHz
Xtal
Oscillator
REF [0:1]
SDRAM_OUT
CPUCLKT [0:2]
CPUCLKC [0:2]
FSO
FS1
TEST
SCLK
SDATA
PCI_STOP
SYSTEM PLL
/2
CONTROL
LOGIC
DIVIDER
STOP
LOGIC
2X
AGPCLK [0:1]
PCICLK [0:6]
PCICLK_F
USB0
USB/IO
PWR_DWN
LATCH
USB/IO
Cypress Semiconductor Corporation
鈥?/div>
3901 North First Street
鈥?/div>
San Jose
鈥?/div>
CA 95134
鈥?/div>
408-943-2600
August 9, 1999
CY22K7PVC-1相關型號PDF文件下載
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