NB100LVEP221中文资料时钟/数据扇出缓冲器，2:1:20 差分，HSTL / ECL / PECL，2.5 V / 3.3 V数据手册ONSEMI规格书

描述 Description

The NB100LVEP221 is a low skew 2:1:20 differential driver, designed with clock distribution in mind, accepting two clock sources into an input multiplexer. The two clock inputs are differential ECL/PECL; CLK1/CLK1bar can also receive HSTL signal levels. The LVPECL input signals can be either differential or single-ended (if the VBB output is used).The LVEP221 specifically guarantees low output-to-output skew. Optimal design, layout, and processing minimize skew within a device and from device to device.To ensure tightest skew, both sides of differential outputs should be terminated identically into 50 ohms even if only one output is being used. If an output pair is unused, both outputs may be left open (unterminated) without affecting skew.The NB100LVEP221, as with most other ECL devices, can be operated from a positive VCC supply in LVPECL mode. This allows the LVEP221 to be used for high performance clock distribution in +3.3 V or +2.5 V systems. In a PECL environment, series or Thevenin line terminations are typically used as they require no additional power supplies. For more information on PECL terminations, designers should refer to Application Note AND8020/D.The VBB pin, an internally generated voltage supply, is available to this device only. For single-ended LVPECL input conditions, the unused differential input is connected to VBB as a switching reference voltage. VBB may also rebias AC coupled inputs. When used, decouple VBB and VCC via a 0.01 uF capacitor and limit current sourcing or sinking to 0.5 mA. When not used, VBB should be left open.Single-ended CLK input operation is limited to VCC >/= 3.0 V in LVPECL mode, or VEE

特性 Features

• 15 ps Typical Output-to-Output Skew
• 40 ps Typical Device-to-Device Skew
• Jitter Less than 2 ps RMS
• Maximum Frequency > 1.0 Ghz Typical
• VBB Output
• 540 ps Typical Propagation Delay
• LVPECL and HSTL Mode Operating Range: VCC = 2.375 V to 3.8 V with VEE = 0 V
• NECL Mode Operating Range: VCC = 0 V with VEE = -2.375 V to -3.8 V
• Q Output will Default Low with Inputs Open or at VEE

应用 Application

• Multiple Clock Sources

简介

NB100LVEP221属于集成电路（IC）的时钟缓冲器驱动器。由制造生产的NB100LVEP221时钟缓冲器，驱动器时钟缓冲器和驱动器集成电路产品族中的产品用于帮助信号在系统中传输，常用作频率/时间参考信号，以同步系统内的活动。尽管这些器件最常用到的功能就是缓冲（即，为使信号不受驱动负载的影响而从某个信号源复制信号），但是该产品族中的某些器件还能执行其他功能，例如选择性改变缓冲信号路径、按某个整数值分割信号频率，或进行所用电信号格式转换。