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參數(shù)資料
| 型號： | W137 |
| 廠商： | CYPRESS SEMICONDUCTOR CORP |
| 元件分類： | XO, clock |
| 英文描述： | Bx Notebook System Frequency Synthesizer |
| 中文描述： | PROC SPECIFIC CLOCK GENERATOR, PDSO28 |
| 封裝： | 0.209 INCH, SSOP-28 |
| 文件頁數(shù)： | 1/10頁 |
| 文件大?。?/td> | 174K |
| 代理商： | W137 |
Bx Notebook System Frequency Synthesizer
W137
Cypress Semiconductor Corporation
3901 North First Street
San Jose
CA 95134
408-943-2600
October 12, 1999, rev. **
Features
Maximized EMI suppression using Cypress’s Spread
Spectrum Technology
Two copies of CPU output
Six copies of PCI output (Synchronous w/CPU output)
One 48-MHz output for USB support
One selectable 24-/48-MHz output
Two Buffered copies of 14.318-MHz input reference
signal
Supports 100-MHz or 66-MHz CPU operation
Power management control input pins
Available in 28-pin SSOP (209 mils)
SS function can be disabled
See W40S11-02 for 2 SDRAM DIMM support
Key Specifications
Supply Voltages: .......................................V
DDQ3
= 3.3V±5%
V
DDQ2
= 2.5V±5%
CPU0:1 Output to Output Skew: ................................ 175 ps
CPU0:1 Cycle to Cycle Jitter: ..................................... 200 ps
PCI_F, PCI1:5 Output to Output Skew:........................500 ps
PCI_F, PCI1:5 Cycle to Cycle Jitter:............................250 ps
CPU to PCI Output Skew: ...............1.5–4.0 ns (CPU Leads)
Output Duty Cycle: .................................................... 45/55%
PCI_F, PCI Edge Rate:.............................................. >1 V/ns
CPU_STOP#, OE, SPREAD#, SEL48#, PCI_STOP#,
PWR_DWN# all have a 250-k
pull-up resistor.
Table 1. Pin Selectable Frequency
SEL100/66#
OE
CPU
PCI
Spread%
0/1
0
HI-Z
HI-Z
Don’t Care
See
Table 2
0
1
66.6 MHz
33.3
1
1
100 MHz
33.3
See
Table 2
Table 2. Spread Spectrum Feature
SPREAD#
Spread Profile
0
–0.5% (down spread)
1
0% (spread disabled)
Block Diagram
Pin Configuration
REF0:1
CPU0:3
CPUdiv2_0:1
3V66_0:3
XTAL
OSC
PLL 1
SPREAD#
SEL0
SEL1
SEL133/100#
X2
X1
PCI_F
PCI1:7
IOAPIC0:2
48MHz
PLL2
÷2
STOP
Clock
Logic
Power
Down
Logic
Three-state
Logic
CPU_STOP#
÷2/÷1.5
STOP
Clock
Logic
÷2
STOP
Clock
Logic
÷2
2
4
2
4
1
7
3
1
PCI_STOP#
PWRDWN#
GND
X1
X2
PCI_F
PCI1
PCI2
GND
VDDQ3
PCI3
PCI4
PCI5
VDDQ3
48MHz
24/48MHz/OE
VDDQ3
REF0/SEL48#
REF1/SPREAD#
VDDQ2
CPU0
CPU1
GND
GND
PCI_STOP#
VDDQ3
CPU_STOP#
PWR_DWN#
SEL100/66#
GND
28
27
26
25
24
23
22
21
20
19
18
17
16
15
1
2
3
4
5
6
7
8
9
10
11
12
13
14
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