描述 Description

The SY89871UMG is a 2.5V/3.3V LVPECL output precision clock divider capable of accepting a high-speed differential clock input (AC or DC-coupled) CML, LVPECL, HSTL or LVDS clock input signal and dividing down the frequency using a programmable divider ratio to create a frequency locked lower speed version of the input clock (Bank B).Available divider ratios are 2, 4, 8 and 16. In a typical 622MHz clock system this would provide availability of 311MHz, 155MHz, 77MHz, or 38MHz auxiliary clock components.The differential input buffer has a unique internal termination design that allows access to the termination network through a VT?pin. This feature allows the device to easily interface to different logic standards. A VREF-AC?reference is included for AC-coupled applications.The SY89871U includes two phase-matched output banks. Bank A (QA) is a frequency-matched copy of the input. Bank B (QB0, QB1) is a divided down output of the input frequency. Bank A and Bank B maintain a matched delay independent of the divider setting.

特性 Features

·Two matched-delay outputs:·Bank A: undivided pass-through (QA)
·Bank B: programmable divide by 2, 4, 8, 16 (QB0, QB1)

·Matched delay: all outputs have matched delay, independent of divider setting
·Guaranteed AC performance:·>2.5GHz fMAX
·<250ps tr/tf
·<670ps tpd?(matched delay)
·<15ps within-device skew

·Low jitter design·231fsRMS?phase jitter (typ.)

·Power supply 3.3V or 2.5V
·Unique patent-pending input termination and VT?pin for DC- and AC-coupled inputs: any differential inputs (LVPECL, LVDS, CML, HSTL)
·TTL/CMOS inputs for select and reset
·100K EP compatible LVPECL outputs
·Parallel programming capability
·Wide operating temperature range: -40°C to +85°C
·Available in 16-pin (3mm x 3mm) QFN package

簡介

SY89871UMG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SY89871UMG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。