描述 Description

The SY89228U is a precision, low jitter 1GHz ÷3, ÷5 clock divider with an LVPECL output. A unique Fail-Safe Input (FSI) protection prevents metastable output conditions when the input clock voltage swing drops significantly below 100mV or input is removed.The differential input includes Micrel's unique, 3-pin internal termination architecture that allows the input 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 270ps.The SY89228U 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 SY89228U is part of Micrel's high-speed, Precision Edge??product line.

特性 Features

? Accepts a high-speed input and provides a precision ÷3 and ÷5 sub-rate, LVPECL output
? Fail-Safe Input
? Prevents oscillations when input is invalid
? Guaranteed AC performance over temperature and supply voltage:
? DC-to >1.0GHz throughput
? <1500ps Propagation Delay (In-to-Q)
? <270ps Rise/Fall times
? 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)
? Wide input voltage range VCC?to GND
? 800mV LVPECL output
? 46% to 54% Duty Cycle(÷ 3)
? 47% to 53% Duty Cycle(÷ 5)
? 2.5V ±5% or 3.3V ±10% supply voltage
? -40°C to +85°C industrial temperature range
? Available in 16-pin (3mm x 3mm) QFN package

簡(jiǎn)介

SY89228U屬于集成電路（IC）的時(shí)鐘發(fā)生器PLL頻率合成器。由制造生產(chǎn)的SY89228U時(shí)鐘發(fā)生器，PLL，頻率合成器時(shí)鐘發(fā)生器、PLL 和頻率合成器集成電路 (IC) 可為邏輯器件提供參考信號(hào)的穩(wěn)定定時(shí)脈沖，這些器件包括計(jì)算機(jī)、微控制器、數(shù)據(jù)通信系統(tǒng)和圖形/視頻發(fā)生器。這些集成電路可能包括緩沖器、驅(qū)動(dòng)器、分頻器、倍頻器、多路復(fù)用器、合成器、扇出分配器和預(yù)分頻器。