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Cypress Semiconductor Electronic Components Datasheet

CY28404 Datasheet

CK409-COMPLIANT CLOCK SYNTHESIZER

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CY28404
CK409-Compliant Clock Synthesizer
Features
• Supports IntelSpringdale/Prescott (CK409)
• Selectable CPU frequencies
• 3.3V power supply
• Nine copies of PCI clock
• Four copies 3V66 clock with optional VCH
• Three copies 48-MHz clock
• Three copies REF clock
• Two differential CPU clock pairs
• Support SMBus/I2C Byte, Word, and Block Read/Write
• Dial-A-Frequency
• Ideal Lexmark Spread Spectrum profile for maximum
electromagnetic interference (EMI) reduction
• 48-pin SSOP package
Table 1. Frequency Table
CPU
3V66
PCI
REF
48M
x2 x4 x9 x3 x3
Block Diagram
XIN
XOUT
FS_(A:E)
VTT_PWRGD#
IREF
XTAL
OSC
PLL Ref Freq
PLL 1
Divider
Network
SEL24#
SELVCH
PLL2
MODE
PD#
2
SDATA
SCLK
I2C
Logic
WD
Timer
2
Pin Configuration
VDD_REF
REF(0:2)
**FS_A/REF_0
**FS_B/REF_1
VDD_CPU
CPUT(0:1), CPUC(0:1)
VDD_REF
XIN
XOUT
VSS_REF
*FS_C/PCIF0
*FS_D/PCIF1
*FS_E/PCIF2
VDD_PCI
VDD_3V66
3V66_(0:2)
VSS_PCI
PCI0
PCI1
VDD_PCI
PCIF(0:2)
PCI2
PCI3
VDD_PCI
PCI(0:5)
VSS_PCI
PCI4
PCI5
3V66_3/VCH
RESET#/PD#
*SEL24#/24_48MHz
DOT_48
VDD_48MHz
USB_48
DOT_48
VSS_48
USB_48
24_48MHz
1 48
2 47
3 46
4 45
5 44
6 43
7 42
8 41
9 40
10 39
11 38
12 37
13 36
14 35
15 34
16 33
17 32
18 31
19 30
20 29
21 28
22 27
23 26
24 25
SSOP-48
REF_2
VDDA
VSSA
IREF
VSS_CPU
CPUT1
CPUC1
VDD_CPU
CPUT0
CPUC0
VSS
DNC***
DNC***
VDD
VTT_PWRGD#
SDATA*
SCLK*
3V66_0
3V66_1
VSS_3V66
VDD_3V66
3V66_2/MODE*
3V66_3/VCH/SELVCH**
VDD_48
RESET#
* 150k Internal Pull-up
** 150k Internal Pull-down
*** Do Not Connect
Cypress Semiconductor Corporation • 3901 North First Street • San Jose, CA 95134 • 408-943-2600
Document #: 38-07510 Rev. *B
Revised June 16, 2004


Cypress Semiconductor Electronic Components Datasheet

CY28404 Datasheet

CK409-COMPLIANT CLOCK SYNTHESIZER

No Preview Available !

CY28404 pdf
CY28404
Pin Description
Pin No.
Name
Type
Description
1, 2, 48
REF(0:2)
O, SE Reference Clock. 3.3V 14.318-MHz clock output.
1, 2, 7, 8, 9 FS_A, FS_B, FS_C, I
FS_D, FS_E
3.3V LVTTL Latched Input for CPU Frequency Selection.
4 XIN
I 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 frequency input.
5 XOUT
O, SE Crystal Connection. Connection for an external 14.318-MHz crystal output.
40, 43
CPUT(0:1)
O, DIF CPU Clock Output. Differential CPU clock outputs.
39, 42
CPUC(0:1)
O, DIF CPU Clock Output. Differential CPU clock outputs.
37, 36
DNC
Do Not Connect
30, 31
3V66(0:1)
O, SE 66-MHz Clock Output. 3.3V 66-MHz clock from internal VCO.
26
3V66_3/VCH/
I/O, SE 48- or 66-MHz Clock Output. 3.3V selectable through external SELVCH
SELVCH
PD strapping resistor and SMBus to be 66 MHz or 48 MHz. Default is 66 MHz.
0 = 66 MHz, 1 = 48 MHz
27
3V66_2/MODE
I/O, SE 66-MHz Clock Output. 3.3V 66-MHz clock from internal VCO. Reset or
PU Power-down Mode Select. Selects between RESET# output or PWRDWN#
input for the PWRDWN#/RESET# pin. Default is RESET#. 0 = PD, 1 = RESET.
7, 8, 9
PCI_F(0:2)
O, SE,PU Free Running PCI Output. 33-MHz clocks divided down from 3V66.
12, 13, 14, 15, PCI(0:5)
18, 19
O, SE PCI Clock Output. 33-MHz clocks divided down from 3V66.
23 USB_48 O, SE Fixed 48-MHz Clock Output.
22 DOT_48 O, SE Fixed 48-MHz Clock Output.
45 IREF
I Current Reference. A precision resistor is attached to this pin which is
connected to the internal current reference.
20
RESET#/PD#
I/O, PU 3.3V LVTTL Input for PowerDown# active LOW. Watchdog Time-out Reset
Output.
21 SEL24#/ I/O, SE 24- or 48-MHz Output. 3.3V fixed 24-MHz or 48-MHz non-spread spectrum
24_48MHz
PU output selectable through an external power-on strapping resistor tied to this
pin. 0 = 24 MHz, 1 = 48 MHz
34
VTT_PWRGD#
I
3.3V LVTTL Input is a Level Sensitive Strobe used to Latch the FS[A:E]
Input (active LOW).
33 SDATA
I/O SMBus-compatible SDATA.
32 SCLK
I SMBus-compatible SCLOCK.
47 VDDA
PWR
3.3V Power Supply for PLL.
46 VSSA
GND
Ground for PLL.
3, 10, 16, 25, VDD(REF,PCI,48,3 PWR
28, 35, 41 V66,CPU),
3.3V Power Supply for Outputs.
6, 11, 17, 29, VSS(REF,PCI,48,3V GND Ground for Outputs.
38, 44, 46 66,CPU,ITP)
Document #: 38-07510 Rev. *B
Page 2 of 20


Part Number CY28404
Description CK409-COMPLIANT CLOCK SYNTHESIZER
Maker Cypress Semiconductor
Total Page 20 Pages
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