SY89843U中文资料Buffers数据手册Microchip规格书

描述 Description

The SY89843U is a low jitter PECL, 2:1 differential input multiplexer (MUX) optimized for redundant source switchover applications. Unlike standard multiplexers, the SY89843U unique 2:1 Runt Pulse Eliminator (RPE) MUX prevents any short cycles or “runt\" pulses during switchover. In addition, a unique Fail-Safe Input protection prevents metastable 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 input 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 output is 800mV, 100K compatible LVPECL with fast rise/fall times guaranteed to be less than 190ps.The SY89843U 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 SY89843U is part of Micrel's high-speed, Precision Edge® product line.

特性 Features

• Selects between two sources, and provides a glitch-free, stable LVPECL output
• Guaranteed AC performance over temperature and supply voltage:
• Wide operating frequency: 1kHz to >1.5GHz
• <880ps In-to-Out tpd
• <190ps tr/tf
• Unique patent-pending input isolation design minimizes crosstalk
• Fail-Safe Input prevents oscillations
• Ultra-low jitter design:
• 65fsRMS phase jitter (typ.)
• <0.7psRMS MUX crosstalk induced jitter
• Unique patent-pending input termination and VT pin accepts DC- and AC-coupled inputs (CML, PECL, LVDS)
• 800mV LVPECL output swing
• 2.5V ±5% or 3.3V ±10% supply voltage
• -40°C to +85°C industrial temperature range
• Available in 24-pin (4mm x 4mm) QFN package

简介

SY89843U属于集成电路（IC）的信号开关多路复用器解码器。由制造生产的SY89843U信号开关，多路复用器，解码器逻辑型信号开关、多路复用器和编码器 IC 可用于对以数字格式表示数据的电信号进行路由和选择。这些器件与设计用于模拟信号的类似产品有所不同，它们保留的信息表示为两个电状态之一，而不是两个外部界限内的无穷变化量。