- 您現在的位置：買賣IC網 > PDF目錄45388 > MSC8256TVT800B (FREESCALE SEMICONDUCTOR INC) 0-BIT, OTHER DSP, PBGA783 PDF資料下載
參數資料
| 型號： | MSC8256TVT800B |
| 廠商： | FREESCALE SEMICONDUCTOR INC |
| 元件分類： | 數字信號處理 |
| 英文描述： | 0-BIT, OTHER DSP, PBGA783 |
| 封裝： | 29 X 29 MM, LEAD FREE, PLASTIC, FCBGA-783 |
| 文件頁數： | 22/68頁 |
| 文件大?。?/td> | 910K |
| 代理商： | MSC8256TVT800B |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁當前第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁第31頁第32頁第33頁第34頁第35頁第36頁第37頁第38頁第39頁第40頁第41頁第42頁第43頁第44頁第45頁第46頁第47頁第48頁第49頁第50頁第51頁第52頁第53頁第54頁第55頁第56頁第57頁第58頁第59頁第60頁第61頁第62頁第63頁第64頁第65頁第66頁第67頁第68頁
Electrical Characteristics
MSC8256 Six-Core Digital Signal Processor Data Sheet, Rev. 3
Freescale Semiconductor
29
To illustrate these definitions using real values, consider the example of a current mode logic (CML) transmitter that has a
common mode voltage of 2.25 V and outputs, TD and TD. If these outputs have a swing from 2.0 V to 2.5 V, the peak-to-peak
voltage swing of each signal (TD or TD) is 500 mV p-p, which is referred to as the single-ended swing for each signal. Because
the differential signaling environment is fully symmetrical in this example, the transmitter output differential swing (VOD) has
the same amplitude as each signal single-ended swing. The differential output signal ranges between 500 mV and –500 mV. In
other words, VOD is 500 mV in one phase and –500 mV in the other phase. The peak differential voltage (VDIFFp) is 500 mV.
The peak-to-peak differential voltage (VDIFFp-p) is 1000 mV p-p.
2.5.2.2
SerDes Reference Clock Receiver Characteristics
The SerDes reference clock inputs are applied to an internal PLL whose output creates the clock used by the corresponding
SerDes lanes. The SerDes reference clock inputs are SR1_REF_CLK/SR1_REF_CLK or SR2_REF_CLK/SR2_REF_CLK.
Figure 5 shows a receiver reference diagram of the SerDes reference clocks.
The characteristics of the clock signals are as follows:
The SerDes reference clock receiver reference circuit structure is as follows:
—The SR[1–2]_REF_CLK and SR[1–2]_REF_CLK are internally AC-coupled differential inputs as shown in
Figure 5. Each differential clock input (SR[1–2]_REF_CLK or SR[1–2]_REF_CLK) has on-chip 50-
Ω
termination to GNDSXC followed by on-chip AC-coupling.
— The external reference clock driver must be able to drive this termination.
— The SerDes reference clock input can be either differential or single-ended. Refer to the differential mode and
single-ended mode descriptions below for detailed requirements.
The maximum average current requirement also determines the common mode voltage range.
— When the SerDes reference clock differential inputs are DC coupled externally with the clock driver chip, the
maximum average current allowed for each input pin is 8 mA. In this case, the exact common mode input voltage
is not critical as long as it is within the range allowed by the maximum average current of 8 mA because the input
is AC-coupled on-chip.
— This current limitation sets the maximum common mode input voltage to be less than 0.4 V (0.4 V
/ 50 = 8 mA)
while the minimum common mode input level is 0.1 V above GNDSXC. For example, a clock with a 50/50 duty
cycle can be produced by a clock driver with output driven by its current source from 0 mA to 16 mA (0–0.8 V),
such that each phase of the differential input has a single-ended swing from 0 V to 800 mV with the common mode
voltage at 400 mV.
— If the device driving the SR[1–2]_REF_CLK and SR[1–2]_REF_CLK inputs cannot drive 50
Ω to GND
SXC DC or
the drive strength of the clock driver chip exceeds the maximum input current limitations, it must be AC-coupled
externally.
The input amplitude requirement is described in detail in the following sections.
Figure 5. Receiver of SerDes Reference Clocks
Input
Amp
50
Ω
50
Ω
SR[1–2]_REF_CLK
相關PDF資料 |
PDF描述 |
|---|---|
| MSC8256SVT1000B | 0-BIT, OTHER DSP, PBGA783 |
| MSM5547RS | 0 TIMER(S), REAL TIME CLOCK, PDIP42 |
| MSM58321RS | 0 TIMER(S), REAL TIME CLOCK, PDIP16 |
| MSM6052GS | 4-BIT, MROM, MICROCONTROLLER, PQFP44 |
| MSM6242BGS | 1 TIMER(S), REAL TIME CLOCK, PDSO24 |
相關代理商/技術參數 |
參數描述 |
|---|---|
| MSC83301 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:RF & MICROWAVE TRANSISTORS GENERAL PURPOSE AMPLIFIER APPLICATIONS |
| MSC83303 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:RF & MICROWAVE TRANSISTORS GENERAL PURPOSE AMPLIFIER APPLICATIONS |
| MSC83305 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:RF & MICROWAVE TRANSISTORS GENERAL PURPOSE AMPLIFIER APPLICATIONS |
| MSC85623 | 制造商:ASI 制造商全稱:ASI 功能描述:NPN RF TRANSISTOR |
| MSC8W38T15-L6 | 功能描述:電纜束帶 MS Strapping, 316 SS, Nylon FC, .38" (9. RoHS:否 制造商:Phoenix Contact 產品:Cable Tie Mounts 類型:Adhesive 顏色:Black 材料:Acrylonitrile Butadiene Styrene (ABS) 長度:19 mm 寬度:19 mm 抗拉強度: |
發(fā)布緊急采購，3分鐘左右您將得到回復。