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參數(shù)資料
| 型號(hào)： | W158HT |
| 廠商： | Silicon Laboratories Inc |
| 文件頁(yè)數(shù)： | 1/12頁(yè) |
| 文件大小： | 0K |
| 描述： | IC CLOCK CK98 SSCG CK98 56SSOP |
| 標(biāo)準(zhǔn)包裝： | 1,000 |
| 類(lèi)型： | * |
| PLL： | 帶旁路 |
| 輸入： | 晶體 |
| 輸出： | 時(shí)鐘 |
| 電路數(shù)： | 1 |
| 比率 - 輸入:輸出： | 1:24 |
| 差分 - 輸入:輸出： | 無(wú)/無(wú) |
| 頻率 - 最大： | 133MHz |
| 除法器/乘法器： | 是/無(wú) |
| 電源電壓： | 2.375 V ~ 3.465 V |
| 工作溫度： | 0°C ~ 70°C |
| 安裝類(lèi)型： | * |
| 封裝/外殼： | * |
| 供應(yīng)商設(shè)備封裝： | * |
| 包裝： | * |
Spread Spectrum System Frequency Synthesizer
W158
......Document #: 38-07164 Rev. *A Page Page 1 of 12 of 12
400 West Cesar Chavez, Austin, TX 78701
1+(512) 416-8500
1+(512) 416-9669
www.silabs.com
1W158
Features
Maximized EMI suppression using Cypress’s spread
spectrum technology
Intel CK98 Specification compliant
0.5% downspread outputs deliver up to 10 dB lower EMI
Four skew-controlled copies of CPU output
Eight copies of PCI output (synchronous w/CPU output)
Four copies of 66 MHz fixed frequency 3.3V clock
Two copies of CPU/2 outputs for synchronous memory
reference
Three copies of 16.67 MHz IOAPIC clock, synchronous
to CPU clock
One copy of 48 MHz USB output
Two copies of 14.31818 MHz reference clock
Programmable to 133- or 100-MHz operation
Power management control pins for clock stop and
shut down
Available in 56-pin SSOP
Key Specifications
Supply Voltages: ...................................... VDDQ3 = 3.3V±5%
...............................................................................................
VDDQ2 = 2.5V±5%
CPU Output Jitter: ...................................................... 150 ps
CPUdiv2, IOAPIC Output Jitter: .................................. 250 ps
48 MHz, 3V66, PCI Output Jitter: ................................ 500 ps
CPU0:3, CPUdiv2_ 0:1 Output Skew: ......................... 175 ps
PCI_F, PCI1:7 Output Skew: ....................................... 500 ps
3V66_0:3, IOAPIC0:2 Output Skew: ........................... 250 ps
CPU to 3V66 Output Offset: ........... 0.0 to1.5 ns (CPU leads)
3V66 to PCI Output Offset:.......... 1.5 to 3.0 ns (3V66 leads)
CPU to IOAPIC Output Offset: ...... 1.5 to 4.0 ns (CPU leads)
CPU to PCI Output Offset:............. 1.5 to 4.0 ns (CPU leads)
Logic inputs, except SEL133/100#, have 250-k
pull-up
resistors
Table 1. Pin Selectable Frequency[1]
SEL133/100#
CPU0:3 (MHz)
PCI
1
133 MHz
33.3 MHz
0
100 MHz
33.3 MHz
Note:
1. See Table 2 for complete mode selection details.
Block Diagram
Pin Configuration
REF0:1
CPU0:3
CPUdiv2_0:1
3V66_0:3
XTAL
PLL 1
SPREAD#
X2
X1
PCI_F
PCI1:7
IOAPIC0:2
48MHz
PLL2
OSC
÷2
STOP
Logic
Power
Three-state
Logic
SEL0
SEL1
SEL133/100#
Clock
CPU_STOP#
÷2/÷1.5
STOP
Logic
Clock
Down
Logic
÷2
STOP
Logic
Clock
÷2
2
4
2
4
1
7
3
1
PCI_STOP#
PWRDWN#
GND
REF0
REF1
VDDQ3
X1
X2
GND
PCI_F
PCI1
VDDQ3
PCI2
PCI3
GND
PCI4
PCI5
VDDQ3
PCI6
PCI7
GND
3V66_0
3V66_1
VDDQ3
GND
W1
5
8
VDDQ2
IOAPIC2
IOAPIC1
IOAPIC0
GND
VDDQ2
CPUdiv2_1
CPUdiv2_0
GND
VDDQ2
CPU3
CPU2
GND
VDDQ2
CPU1
CPU0
GND
VDDQ3
GND
PCI_STOP#
CPU_STOP#
PWRDWN#
SPREAD#
SEL1
56
55
54
53
52
51
50
49
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
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
32
31
30
29
3V66_2
3V66_3
VDDQ3
SEL133/100#
SEL0
VDDQ3
48MHz
GND
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