SY89112U中文资料Buffers数据手册Microchip规格书

描述 Description

The SY89112U is a low-jitter, low-skew, high-speed LVPECL 1:12 differential fanout buffer optimized for precision telecom and enterprise server distribution applications. The input includes a 2:1 MUX for clock switchover application. Unlike other multiplexers, this input includes a unique isolation design to minimize channel-to-channel crosstalk. The SY89112U distributes clock frequencies from DC to >2GHz guaranteed over temperature and voltage. The SY89112U incorporates a synchronous output enable (EN) so that the outputs will only be enabled/disabled when they are already in the LOW state. This reduces the chance of generating \"runt\" clock pulses.The SY89112U differential input includes Micrel's unique, patent-pending 3-pin input termination architecture that directly interfaces 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. For AC-coupled input interface, an on-board output reference voltage (VREF-AC) is provided to bias the center-tap (VT) pin. The outputs are 800mV, 100K-compatible LVPECL with fast rise/fall times guaranteed to be less than 220ps.The SY89112U 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 SY89112U is part of Micrel's high-speed, Precision Edge® product line.

特性 Features

• Selects between 1 of 2 inputs, and provides 12 precision, low skew LVPECL output copies
• Guaranteed AC performance over temperature and voltage:
• DC to >2GHz throughput
• <550ps propagation delay CLK-to-Q
• <220ps rise/fall time
• <25ps output-to-output skew
• Ultra-low jitter design:
• 50fsRMS phase jitter (typ.)
• <0.7psRMS crosstalk induced jitter
• Unique, patent-pending input termination and VT pin accepts DC-coupled and AC-coupled differential inputs
• Unique, patent-pending 2:1 input MUX provides superior isolation to minimize channel-to-channel crosstalk
• 800mV, 100K LVPECL output swing
• Power supply 2.5V +5% or 3.3V +10%
• Industrial temperature range -40°C to +85°C
• Available in 44-pin (7mm x 7mm) QFN package

简介

SY89112U属于集成电路（IC）的时钟缓冲器驱动器。由制造生产的SY89112U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。