SY89221U数据手册集成电路（IC）的时钟缓冲器驱动器规格书PDF

描述 Description

The SY89221U is a 2.5/3.3V precision, high-speed, integrated clock divider and LVPECL fanout buffer capable of handling clocks up to 1.5GHz. Optimized for communications applications, the four independently controlled output banks are phasematched and can be configured for pass through ÷1, ÷2 or ÷4 divider ratios.The differential input includes Micrel's unique, 3-pin input termination architecture that allows the user 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 low-skew, low-jitter outputs are LVPECL compatible with extremely fast rise/fall times that are guaranteed to be less than 220ps.The /MR (master reset) input asynchronously resets the outputs. A four-clock delay after de-asserting /MR allows the counters to synchronize and start the outputs from the same state without any runt pulse.The SY89221U is part of Micrel's Precision Edge® product family.

特性 Features

• Four low-skew LVPECL output banks with independently programmable ÷1, ÷2 and ÷4 divider options
• Four output banks, 15 total outputs
• Guaranteed AC performance over temperature and voltage:
• Accepts a clock frequency up to 1.5GHz
• <1600ps IN-to-OUT propagation delay
• <270ps rise/fall time
• <35ps within-bank skew
• Fail Safe Input
• Prevents outputs from oscillating
• Ultra-low jitter design:
• <1psRMS random jitter
• <10psPP total jitter (clock)
• Patent-pending input termination and VT pin accepts DC- and AC-coupled inputs (CML, PECL, LVDS)
• CMOS/TTL-compatible output enable (EN) and divider select control
• 2.5V ±5% or 3.3V ±10% power supply
• -40°C to +85°C temperature range
• Available in 64-pin TQFP

简介

SY89221U属于集成电路（IC）的时钟缓冲器驱动器。由制造生产的SY89221U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。