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W48S87-72 Datasheet

  • W48S87-72

  • Desktop/Notebook Frequency Generator

  • 247.94KB

  • 19頁(yè)

  • CYPRESS

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W48S87-72
Desktop/Notebook Frequency Generator
Features
鈥?Maximized EMI suppression using Cypress鈥檚 Spread
Spectrum technology
鈥?鹵0.5% Spread Spectrum clocking
鈥?Equivalent to the W48S67-72 with Spread Spectrum for
Tilamook, MMO, and Deschutes processors
鈥?Generates system clocks for CPU, IOAPIC, SDRAM,
PCI, USB plus 14.318-MHz (REF0:1)
鈥?Serial data interface (SDATA, SCLOCK inputs) provides
additional CPU/PCI clock frequency selections, individ-
ual output clock disabling and other functions
鈥?MODE input pin selects optional power management
input control pins (reconfigures pins 26 and 27)
鈥?Two fixed outputs separately selectable as 24-MHz or
48-MHz (default = 48-MHz)
鈥?V
DDQ3
= 3.3V鹵5%, V
DDQ2
= 2.5V鹵5%
鈥?Uses external 14.318-MHz crystal
鈥?Available in 48-pin SSOP (300 mils)
鈥?/div>
10鈩?CPU output impedance
Table 1. Pin Selectable Frequency
[1]
60/66_SEL
0
1
CPU, SDRAM
Clocks (MHz)
60
66.8
PCI Clocks
(MHz)
30
33.4
Block Diagram
VDDQ3
REF0
X1
X2
XTAL
OSC
PLL Ref Freq
VDDQ2
IOAPIC
VDDQ2
CPU0
CPU_STOP#
I/O
Control
Stop
Output
Control
CPU1
CPU2
CPU3
VDDQ3
SDRAM0
SDRAM1
SDRAM2
60/66_SEL
PLL 1
SDRAM3
SDRAM4
SDRAM5
梅2
SDRAM6
SDRAM7
PCI_F
Stop
Output
Control
Power
Down
Control
PCI0
PCI1
PCI2
PWR_DWN#
PCI3
PCI4
PCI5
PLL2
48/24MHZ
48/24MHZ
REF1
Pin Configuration
REF1
REF0
GND
X1
X2
MODE
VDDQ3
PCI_F
PCI0
GND
PCI1
PCI2
PCI3
PCI4
VDDQ3
PCI5
GND
60/66_SEL
SDATA
SCLOCK
VDDQ3
48/24MHZ
48/24MHZ
GND
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
VDDQ3
CPU2.5#
VDDQ2
IOAPIC
PWR_DWN#
GND
CPU0
CPU1
VDDQ2
CPU2
CPU3
GND
SDRAM0
SDRAM1
VDDQ3
SDRAM2
SDRAM3
GND
SDRAM4
SDRAM5
VDDQ3
SDRAM6/CPU_STOP#
SDRAM7/PCI_STOP#
VDDQ3
W48S87-72
MODE
Note:
1. Additional frequency selections provided by serial data interface; refer to
Table 5
on page 8.
Cypress Semiconductor Corporation
鈥?/div>
3901 North First Street
鈥?/div>
San Jose
鈥?/div>
CA 95134 鈥?/div>
408-943-2600
August 4, 2000 rev. *A

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