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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  
Tstable  
<1 ms  
PWRDWN  
DIFT  
DIFC  
Tdrive_Pwrdwn#  
<300 Ps, >200 mV  
Figure 4. PWRDWN Deassertion Diagram, OE_INV = 1  
Table 4. Buffer Power-up State Machine  
State  
Description  
0
1
3.3V Buffer power off  
After 3.3V supply is detected to rise above 1.8V–2.0V, the buffer enters state 1 and initiates a 0.2-ms–0.3-ms delay  
2[5]  
Buffer waits for PWRDWN deassertion (and a valid clock on the SRC_IN input if in PLL mode)  
3[2, 3, 4] Outputs enabled for normal operation (PLL lock to the SRC_IN input is assured in PLL mode)  
Figure 5. Buffer Power-up State Diagram[1]  
disabled via OE control, the output will always be tri-stated  
regardless of the SRC_STP Drive Mode register bit state.  
SRC_STP Clarification  
The SRC_STP signal is an asynchronous input used for clean  
stopping and starting the DIFT/C outputs. This input can be  
Active High or Active Low based on the strapped value of the  
OE_INV input. The SRC_STP signal is a debounced signal in  
that its state must remain unchanged during two consecutive  
rising edges of DIFC to be recognized as a valid assertion or  
deassertion. (The assertion and deassertion of this signal is  
absolutely asynchronous.) In the case where the output is  
Table 5. SRC_STP Functionality[6]  
OE_INV  
SRC_STP  
DIFT  
Normal  
DIFC  
Normal  
Low  
0
0
1
1
1
0
1
0
Iref * 6 or Float  
Iref * 6 or Float  
Normal  
Low  
Normal  
Notes:  
1. Disabling of the SRCT_IN input clock prior to assertion of PWRDWN is an undefined mode and not recommended. Operation in this mode may result in glitches  
excessive frequency shifting.  
2. The total power-up latency from power on to all outputs active is less than 1 ms (assuming a valid clock is present on SRC_IN input).  
3. LOCK output is a latched signal that is reset with the assertion of PWRDWN or when VDD<1.8V.  
4. Special care must be taken to ensure that no abnormal clock behavior occurs after the assertion PLL LOCK (i.e., overshoot/undershoot is allowed).  
5. In PLL mode, if power is valid and PWRDWN is deasserted but no input clocks are present on the SRC_IN input, DIF clocks will remain disabled. Only after valid  
input clocks are detected, valid power, PWRDWN deasserted with the PLL locked and stable, are the DIF outputs enabled.  
6. In the case where OE is asserted low, the output will always be three-stated regardless of SRC_STP drive mode register bit state.  
Rev 1.0,November 21, 2006  
Page 7 of 15