描述 Description

The SY89847U is a 2.5V, 1:5 LVDS fanout buffer with a 2:1 differential input multiplexer (MUX). 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 significantly below 100mV).The differential input includes Micrel's unique, 3-pin internal termination architecture that can 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 LVDS compatible with very fast rise/fall times guaranteed to be less than 210ps.The SY89847U operates from a 2.5V ±5% supply and is guaranteed over the full industrial temperature range of -40°C to +85°C. The SY89847U is part of Micrel's high-speed, Precision Edge??product line.

特性 Features

? Selects between two sources, and provides 5 precision LVDS copies
? Fail-Safe Input
? Prevents outputs from oscillating when input is invalid
? Guaranteed AC performance over temperature and supply voltage:
? DC-to >1.5GHz throughput
? <1000ps Propagation Delay (IN-to-Q)
? <210ps Rise/Fall times
? Ultra-low jitter design:
? 150fsRMS?phase jitter (typ.)
? <0.7psRMS?MUX crosstalk induced jitter
? Unique, patented MUX input isolation design minimizes adjacent channel crosstalk
? Unique, patented internal termination and VT?pin accepts DC- and AC-coupled inputs (CML, PECL, LVDS)
? Wide input voltage range VCC?to GND
? 2.5V ±5% supply voltage
? -40°C to +85°C industrial temperature range
? Available in 32-pin (5mm x 5mm) QFN package

簡(jiǎn)介

SY89847U屬于集成電路（IC）的時(shí)鐘緩沖器驅(qū)動(dòng)器。由制造生產(chǎn)的SY89847U時(shí)鐘緩沖器，驅(qū)動(dòng)器時(shí)鐘緩沖器和驅(qū)動(dòng)器集成電路產(chǎn)品族中的產(chǎn)品用于幫助信號(hào)在系統(tǒng)中傳輸，常用作頻率/時(shí)間參考信號(hào)，以同步系統(tǒng)內(nèi)的活動(dòng)。盡管這些器件最常用到的功能就是緩沖（即，為使信號(hào)不受驅(qū)動(dòng)負(fù)載的影響而從某個(gè)信號(hào)源復(fù)制信號(hào)），但是該產(chǎn)品族中的某些器件還能執(zhí)行其他功能，例如選擇性改變緩沖信號(hào)路徑、按某個(gè)整數(shù)值分割信號(hào)頻率，或進(jìn)行所用電信號(hào)格式轉(zhuǎn)換。