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CY28408 Datasheet(PDF) 1 Page - Cypress Semiconductor

Part No. CY28408
Description  Clock Synthesizer with Differential CPU Outputs
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Maker  CYPRESS [Cypress Semiconductor]
Homepage  http://www.cypress.com
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CY28408 Datasheet(HTML) 1 Page - Cypress Semiconductor

 
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Clock Synthesizer with Differential CPU Outputs
CY28408
Cypress Semiconductor Corporation
3901 North First Street
San Jose
, CA 95134
408-943-2600
Document #: 38-07617 Rev. **
Revised December 17, 2003
Features
• Compatible to Intel® CK 408 Mobile Clock Synthesizer
• Support Intel P4 and Brookdale CPU
• Specifications
• 3.3V power supply
• Three differential CPU clocks
• Ten copies of PCI clocks
• Six copies of 3V66 clocks
• SMBus support with read back capabilities
• Spread Spectrum electromagnetic interference (EMI)
reduction
• Dial-A-Frequency® features
• Dial-A-dB
 features
• 56-pin TSSOP package
Note:
1. TCLK is a test clock driven on the XTAL_IN input during test mode. M = driven to a level between 1.0V and 1.8V. If the S2 pin is at a M level during power-up, an
0 state will be latched into the device’s internal state register.
Table 1. Frequency Table[1]
S2
S1
S0
CPU(0:2)
3V66
PCI_PCIF
REF
USB/DOT
1
0
0
100 MHz
66 MHz
33 MHz
14.318 MHz
48 MHz
1
0
1
133 MHz
66 MHz
33 MHz
14.318 MHz
48 MHz
110
Reserved
1
1
1
166 MHz
66 MHz
33 MHz
14.318 MHz
48 MHz
0
0
0
66 MHz
66 MHz
33 MHz
14.318 MHz
48 MHz
0
0
1
100 MHz
66 MHz
33 MHz
14.318 MHz
48 MHz
010
Reserved
0
1
1
133 MHz
66 MHz
33 MHz
14.318 MHz
48 MHz
M
0
0
Hi-Z
Hi-Z
Hi-Z
Hi-Z
Hi-Z
M
0
1
TCLK/2
TCLK/4
TCLK/8
TCLK
TCLK/2
Block Diagram
Pin Configuration
PLL1
PLL2
/2
WD
Logic
Power
Up Logic
XIN
XOUT
CPU_STP#
IREF
VSSIREF
S(0:2)
MULT0
VTT_PWRGD#
PCI_STP#
PD#
SDATA
SCLK
VDDA
3V66[2:5]
48M_DOT
48M_USB
PCI_F(0:2)
PCI(0:6)
3V66_1/VCH
3V66_0
CPUC(0:2)
CPUT(0:2)
REF
I2C
Logic
VDD
XIN
XOUT
VSS
PCIF0
PCIF1
PCIF2
VDD
VSS
PCI0
EPCI1/PCI1
PCI2
EPCI3/PCI3
VDD
VSS
PCI4
PCI5
PCI6
VDD
VSS
3V66_2
3V66_3
3V66_4
3V66_5
PD#
VDDA
VSSA
VTT_PWRGD#
REF
S1
S0
CPU_STP#
CPUT0
CPUC0
VDD
CPUT1
CPUC1
VSS
VDD
CPUT2
CPUC2
MULT0
IREF
VSSIREF
S2
48M_USB
48M_DOT
VDD
VSS
3V66_1/VCH
PCI_STP#
3V66_0
VDD
VSS
SCLK
SDATA
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