Clock Synthesizer
Description
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CY28419
Clock Synthesizer with Differential SRC and CPU Outputs
Features
• • • • • • • CK409B-compliant Supports Intel Pentium 4-type CPUs Selectable CPU frequencies 3.
3V power supply Ten copies of PCI clocks Two copies 48-mHz clock Five copies of 3V66 with one optional VCH • • • • Four differential CPU clock pairs One differential SRC clock I2C support with readback capabilities Ideal Lexmark Spread Spectrum profile for maximum electromagnetic interference (EMI) reduction • 56-pin SSOP package
CPU x4 SRC x1 3V66 x5 PCI x 10 REF x2 48M x2
Block Diagram
XIN XOUT
Pin Configuration
VDD_REF REF0:1 VDD_CPU CPUT(0:3), CPUC(0:3) VDD_SRC SRCT, SRCC
[1]
XTAL OSC PLL 1
PLL Ref Freq
Divider Network
FS_(A:B) VTT_PWRGD# IREF VDD_3V66 3V66_(0:3)
PLL2
2
VDD_PCI PCIF(0:2) PCI(0:6)
3V66_4/VCH PD# VDD_48MHz DOT_48 USB_48
SDATA SCLK
I2C Logic
REF_0 REF_1 VDD_REF XIN XOUT VSS_REF PCIF0 PCIF1 PCIF2 VDD_PCI VSS_PCI PCI0 PCI1 PCI2 PCI3 VDD_PCI VSS_PCI PCI4 PCI5 PCI6 PD# 3V66_0 3V66_1 VDD_3V66 VSS_3V66 3V66_2 3V66_3 SCLK
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
FS_B VDD_A VSS_A VSS_IREF IREF FS_A CPUT3 CPUC3 VDD_CPU CPUT2 CPUC2 VSS_CPU CPUT1 CPUC1 VDD_CPU CPUT0 CPUC0 VSS_SRC SRCT SRCC VDD_SRC VTT_PWRGD# VDD_48 VSS_48 DOT_48 USB_48 SDATA 3V66_4/VCH
SSOP-56
CY28419
Note: 1.
Signals marked with [*] and [**] have internal pull-up and pull-down resistors, respectively.
Cypress Semiconductor Corporation Document #: 38-07444 Rev.
*D
•
3901 North First Street
•
San Jose, CA 95134 • 408-943-2600 Revised February 05, 2004
CY28419
Pin Description
Pin No.
1,2 4 Pin Name REF(0:1) XIN Pin Type O, SE I Pin Description Reference Clock.
3.
3V 14.
318-Mz clock output.
Crystal Connection or External Reference Frequency Input.
This pin has dual functions.
It can be used as an external 14.
318-MHz crystal connection or as an external reference frequen...
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