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CY28800 参数 Datasheet PDF下载

CY28800图片预览
型号: CY28800
PDF下载: 下载PDF文件 查看货源
内容描述: 100 - MHz差分缓冲器,用于PCI Express和SATA [100-MHz Differential Buffer for PCI Express and SATA]
分类和应用: PC
文件页数/大小: 15 页 / 211 K
品牌: SPECTRALINEAR [ SPECTRALINEAR INC ]
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CY28800  
Pin Description  
Pin  
Name  
Type  
Description  
4,5  
SRCT_IN, SRCC_IN  
I,DIF 0.7V Differential inputs  
8,9;12,13;16,17;20,21; 30,29; DIF[T/C][7:0]  
34,33;38,37;42,41  
O,DIF 0.7V Differential Clock Outputs  
6,7,14,15,35,36,43,44  
OE_[7:0]  
I,SE 3.3V LVTTL input for enabling differential outputs  
Active High if OE_INV = 0  
Active Low if OE_INV = 1  
28  
45  
26  
HIGH_BW#  
LOCK  
I,SE 3.3V LVTTL input for selecting PLL bandwidth  
0 = High BW, 1 = Low BW  
O,SE 3.3V LVTTL output, transitions high when PL lock is  
achieved (latched output)  
PWRDWN  
I,SE 3.3V LVTTL input for Power Down  
Active Low if OE_INV = 0  
Active High if OE_INV = 1  
1
SRC_DIV2#  
SRC_STP  
I,SE 3.3V LVTTL input for selecting input frequency divided by  
two, active low  
27  
I,SE 3.3V LVTTL input for SRC_STP. Disables stoppable outputs.  
Active Low if OE_INV = 0  
Active High if OE_INV = 1  
23  
24  
46  
SCLK  
SDATA  
IREF  
I,SE SMBus Slave Clock Input  
I/O,OC Open collector SMBus data  
I
A precision resistor is attached to this pin to set the differ-  
ential output current  
22  
PLL/BYPASS#  
VDD_A  
VSS_A  
VSS  
I
3.3V LVTTL input for selecting fan-out or PLL operation  
48  
PWR 3.3V Power Supply for PLL  
GND Ground for PLL  
47  
3,10,18,25,32  
2,11,19,31,39  
40  
GND Ground for outputs  
VDD  
PWR 3.3V power supply for outputs  
OE_INV  
I, SE Input strap for setting polarity of OE_[7:0], SRC_STP, and  
PWRDWN  
Serial Data Interface  
Data Protocol  
To enhance the flexibility and function of the clock buffer, a  
two-signal serial interface is provided. Through the Serial Data  
Interface, various device functions, such as individual clock  
output buffers, can be individually enabled or disabled. The  
registers associated with the Serial Data Interface initializes to  
their default setting upon power-up, and therefore use of this  
interface is optional. Clock device register changes are  
normally made upon system initialization, if any are required.  
The interface cannot be used during system operation for  
power management functions.  
The clock driver serial protocol accepts byte write, byte read,  
block write, and block read operations from the controller. For  
block write/read operation, the bytes must be accessed in  
sequential order from lowest to highest byte (most significant  
bit first) with the ability to stop after any complete byte has  
been transferred. For byte write and byte read operations, the  
system controller can access individually indexed bytes. The  
offset of the indexed byte is encoded in the command code,  
as described in Table 1.  
The block write and block read protocol is outlined in Table 2  
while Table 3 outlines the corresponding byte write and byte  
read protocol. The slave receiver address is 11011100 (DCh).  
Table 1. Command Code Definition  
Bit  
Description  
7
0 = Block read or block write operation  
1 = Byte read or byte write operation  
(6:0)  
Byte offset for byte read or byte write operation. For block read or block write operations, these bits should be  
'0000000'  
Rev 1.0,November 21, 2006  
Page 2 of 15