描述 Description

The SY89218U is a 2.5V precision, high-speed, integrated clock divider and LVDS fanout buffer capable of handling clocks up to 1.5GHz. Optimized for communications applications, the four independently controlled output banks are phase-matched 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 LVDS compatible with extremely fast rise/fall times guaranteed to be less than 200ps.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 SY89218U is part of Micrel's Precision Edge??product family.

特性 Features

? Low-skew LVDS 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
? <200ps 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)
? LVDS-compatible outputs
? CMOS/TTL-compatible output enable (EN) and divider select control
? 2.5V ±5% power supply
? -40°C to +85°C temperature range
? Available in 64-pin TQFP

簡介

SY89218U屬于集成電路（IC）的時鐘緩沖器驅(qū)動器。由制造生產(chǎn)的SY89218U時鐘緩沖器，驅(qū)動器時鐘緩沖器和驅(qū)動器集成電路產(chǎn)品族中的產(chǎn)品用于幫助信號在系統(tǒng)中傳輸，常用作頻率/時間參考信號，以同步系統(tǒng)內(nèi)的活動。盡管這些器件最常用到的功能就是緩沖（即，為使信號不受驅(qū)動負載的影響而從某個信號源復(fù)制信號），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路徑、按某個整數(shù)值分割信號頻率，或進行所用電信號格式轉(zhuǎn)換。