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USB2512B-AEZG 参数 Datasheet PDF下载

USB2512B-AEZG图片预览
型号: USB2512B-AEZG
PDF下载: 下载PDF文件 查看货源
内容描述: USB 2.0高速集线器控制器 [USB 2.0 Hi-Speed Hub Controller]
分类和应用: 外围集成电路控制器PC时钟
文件页数/大小: 72 页 / 1689 K
品牌: SMSC [ SMSC CORPORATION ]
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USB 2.0 Hi-Speed Hub Controller  
Datasheet  
Chapter 10 AC Specifications  
10.1  
Oscillator/Clock  
Crystal: Parallel Resonant, Fundamental Mode, 24/481 MHz ±350 ppm.  
External Clock: 50% Duty cycle ± 10%, 24/48 MHz ± 350 ppm, Jitter < 100 ps rms.  
XTAL1  
(CS1 = CB + CXTAL  
)
C1  
1 Meg  
Crystal  
CL  
C2  
XTAL2  
(CS2 = CB + CXTAL  
)
Figure 10.1 Typical Crystal Circuit  
Note: CB equals total board/trace capacitance.  
(C1 + CS1) x (C2 + CS2)  
(C1 + CS1 + C2 + CS2)  
CL =  
Figure 10.2 Formula to Find the Value of C1 and C2  
C = (2 x CL) - Cs  
Figure 10.3 Simplified Form of the Capacitance Formula  
10.1.1  
SMBus Interface:  
The SMSC Hub conforms to all voltage, power, and timing characteristics and specifications as set  
forth in the SMBus 1.0 specification for Slave-Only devices (except as noted in Section 8.3).  
2
10.1.2  
10.1.3  
I C EEPROM:  
Clock frequency is fixed at 60 KHz ± 20%.  
USB 2.0  
The SMSC Hub conforms to all voltage, power, and timing characteristics and specifications as set  
forth in the USB 2.0 specification. Please refer to the USB 2.0 specification for more information.  
1.Only when SEL48 is available and supported.  
Revision 1.0 (3-11-09)  
66  
SMSC USB251x  
DATASHEET