SY89464U中文资料Buffers数据手册Microchip规格书

描述 Description

The SY89464U is a low jitter 1:10 LVPECL fanout buffer with a 2:1 differential input multiplexer (MUX) optimized for redundant source switchover applications. Unlike standard multiplexers, the SY89464U's unique 2:1 Runt Pulse Eliminator (RPE) MUX prevents any short cycles or \"runt\" pulses during switchover. In addition, a unique Fail-Safe Input (FSI) protection prevents metastable output conditions when the selected input clock fails to a DC voltage (voltage between the pins of the differential input drops below 100mV).The differential input includes Micrel's unique, 3-pin internal termination architecture that allows customers to interface to any differential signal (AC- or DC-coupled) as small as 100mV (200mVPP) without any level shifting or termination resistor networks in the signal path. The outputs are 800mV, 100K-compatible LVPECL with fast rise/fall times guaranteed to be less than 220ps.The SY89464U operates from a 2.5V ±5% or 3.3V ±10% supply and is guaranteed over the full industrial temperature range of -40°C to +85°C. The SY89464U is part of Micrel's high-speed, Precision Edge® product line.

特性 Features

• Selects between two sources, and provides 10 precision LVPECL copies
• Guaranteed AC performance over temperature and supply voltage:
• Wide operating frequency: 1kHz to >1.5GHz
• <1100ps In-to-Out tpd
• <220ps tr/tf
• Unique, patent-pending MUX input isolation design minimizes adjacent channel crosstalk
• Fail-Safe Input prevents oscillations
• Ultra-low jitter design:
• <1psRMS random jitter
• <1psRMS cycle-to-cycle jitter
• <10psPP total jitter (clock)
• <0.7psRMS MUX crosstalk induced jitter
• Unique patented internal termination and VT pin accepts DC- and AC-coupled inputs (CML, PECL, LVDS)
• 800mV LVPECL output
• 2.5V ±5% or 3.3V ±10% supply voltage
• Output enable
• -40°C to +85°C industrial temperature range
• Available in 44-pin (7mm x 7mm) QFN package

简介

SY89464U属于集成电路（IC）的时钟缓冲器驱动器。由制造生产的SY89464U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。