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參數資料
| 型號： | CY2215 |
| 廠商： | Cypress Semiconductor Corp. |
| 英文描述： | 133-MHz Spread Spectrum Frequency Timing Generator(133MHz 寬頻譜定時發生器) |
| 中文描述： | 133 - MHz的擴頻頻率定時發生器（133MHz的寬頻譜定時發生器） |
| 文件頁數： | 1/8頁 |
| 文件大小： | 108K |
| 代理商： | CY2215 |
133-MHz Spread Spectrum Frequency Timing Generator
CY2215
PRELIMINARY
Cypress Semiconductor Corporation
3901 North First Street
San Jose
CA 95134
408-943-2600
October 1, 1999
215
Features
Benefits
Mixed 2.5V and 3.3V Operation
Multiple output clocks at different frequencies
—Three CPU clocks, up to 133 MHz
—Ten synchronous PCI clocks, 1 free-running
—One CPU/2 clock, at one-half the CPU frequency
—Three 66 MHz clocks
—One synchronous IOAPIC clock, at 16.67 MHz
—One 48 MHz clock
—Two reference clocks at 14.318 MHz
Usable with Pentium
II, K6, and 6x86 Processors
Single chip main motherboard clock generator
—Driven together, support 3 CPUs and a chipset
—Support for 4 PCI slots and chipset
—Drives up to two main memory clock generators,
including DRCG
—Support for multiple AGP slots
—Support multiprocessing systems
—Supports USB frequencies and I/O chip
—Supports ISA slots and I/O chip
Enables reduction of EMI in some systems
Spread Spectrum clocking
—31 kHz modulation frequency
—EPROM programmable percentage of spreading.
Default is –0.5%, which is recommended by Intel.
Power-down features
Three Select inputs
Low skew and low jitter outputs
OE and Test Mode support
48-pin SSOP package
Supports mobile systems
Supports up to eight CPU clock frequencies
Meet tight system timing requirements at high frequency
Enables ATE and “bed of nails” testing
Widely available, standard package enables lower cost
Intel and Pentium are registered trademarks of Intel Corporation.
Logic Block Diagram
EPROM
XTALOUT
XTALIN
IOAPIC (16.67 MHz)
14.318
MHz
OSC.
PCICLK_F (33.33 MHz)
SEL1
CPU
PLL
REFCLK0 (14.318 MHz)
CPUCLK [0-2]
PCICLK [1-9] (33.33 MHz)
SYS
PLL
48 MHz CLK
SEL133
SPREAD
CPUCLK/2
Divider,
EPROM-Prog
Delay
and
Stop Logic
PWR_DWN
66CLK [0-2] (66.67 MHz)
SSOP
Top View
1
2
3
4
5
6
7
8
9
10
11
12
13
25
28
27
26
SEL0/REFCLK0
REFCLK1
14
15
16
17
18
19
20
21
22
23
24
37
36
35
34
33
29
30
31
32
40
39
38
V
DDREF
XTALIN
41
44
43
42
45
48
47
46
PCICLK2
V
DDPCI
PCICLK8
PCICLK9
66CLK2
V
SS48
SEL133
PWR_DWN
SPREAD
V
SSCPU
V
DDCPU
V
SSAPIC
V
DDCPU/2
PCICLK_F
PCICLK6
PCICLK7
V
SS66
NC
V
SSCPU
AV
DD
V
SSCPU/2
V
DDCPU
V
SSREF
V
DDAPIC
XTALOUT
V
SSPCI
PCICLK1
V
DDPCI
PCICLK3
PCICLK4
PCICLK5
V
SSPCI
66CLK0
66CLK1
V
DD66
48CLK
V
DD48
SEL1
AV
SS
CPUCLK0
CPUCLK1
CPUCLK2
CPUCLK/2
IOAPIC
C
REFCLK1 (14.318 MHz)
SEL0
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