CY28RS400ZCT SPECTRALINEAR [SpectraLinear Inc], CY28RS400ZCT Datasheet
CY28RS400ZCT
Manufacturer Part Number
CY28RS400ZCT
Description
Clock Generator for ATI RS400 Chipset
Manufacturer
SPECTRALINEAR [SpectraLinear Inc]
Datasheet
1.CY28RS400ZCT.pdf
(18 pages)
Rev 1.0, November 22, 2006
2200 Laurelwood Road, Santa Clara, CA 95054
Features
CLKREQ[0:1]#
• Supports Intel CPU
• Selectable CPU frequencies
• Differential CPU clock pairs
• 100 MHz differential SRC clocks
• 48 MHz USB clock
• 33 MHz PCI clock
Block Diagram
CPU_STP#
VTT_PWRGD#
FS_[C:A]
SDATA
XOUT
SCLK
IREF
XIN
PD
PLL1
PLL2
Logic
XTAL
OSC
I
2
C
Network
Divider
PLL Ref Freq
Clock Generator for ATI
Tel:(408) 855-0555
VDD_REF
REF[0:2]
VDD_CPU
VDD_SRC
VDD_PCI
VDD_48 MHz
USB_48
CPUT[0:2], CPUC[0:2],
SRCT[0:5],SRCC[0:5]
VDD_SRCS
SRCST[0:1],SRCSC[0:1]
PCI
VTT_PWRGD#/PD
• Low-voltage frequency select input
• I
• Ideal Lexmark Spread Spectrum profile for maximum
• 3.3V power supply
• 56-pin SSOP and TSSOP packages
electromagnetic interference (EMI) reduction
2
CPU
CLKREQ#0
CLKREQ#1
C support with readback capabilities
Pin Configuration
x3
VDD_SRC
VDD_SRC
VSS_SRC
VSS_SRC
VSS_SRC
SRCSC1
Fax:(408) 855-0550
SRCST1
VDD_48
USB_48
VSS_48
SRCC5
SRCC4
SRCC3
SRCC2
SRCC1
SRCT5
SRCT4
SRCT3
SRCT2
SRCT1
SDATA
XOUT
SCLK
FSC
Xin
SRC
x8
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 SSOP/TSSOP
PCI
x1
RS400 Chipset
www.SpectraLinear.com
CY28RS400
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
REF
x 3
VDD_REF
VSS_REF
REF0/FSA
REF1/FSB
REF2
VDD_PCI
PCI0/409_410
VSS_PCI
CPU_STOP#
CPUT0
CPUC0
VDD_CPU
VSS_CPU
CPUT1
CPUC1
CPUT2
CPUC2
VDDA
VSSA
IREF
VSS_SRC1
VDD_SRC1
SRCT0
SRCC0
VDD_SRCS
VSS_SRCS
SRCST0
SRCSC0
Page 1 of 18
USB_48
x 1
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