Instrukcja obsługi Microchip SY58031U

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SY58031U

Ultra-Precision 1:8 CML Fanout Buffer

with Internal I/O Termination

Micrel Inc. • 2180 Fortune Drive • Jose, CA 95131 • USA • tel +1 (408) 9440800 • fax + 1 (408) 4741000 • San --http://www.micrel.com

October 1

, 2013 Revision 5.0

hbwhelp@micrel.comor (408) 955-1690

General Description

The SY58031U is a 2.5V/3.3V precision, high-speed, fully

differential CML 1:8 fanoutbuffer. The SY58031U is

optimized to provide eight identical output copies with less

than 20ps of skew and only 75fsRMSphase jitter. It can

process clock signals as fast as 6GHz.

The differential input includes Micrel’s unique, 3-pin input

termination architecture that allows the SY58031U to

directly interface to CML, LVPECL, and LVDS differential

signals (ACshifting or - --or DCcoupled) without any level

termination resistor networks in the signal path. The result

is a clean, stubce solution. The CML -free, low-jitter interfa

outputs feature 400mV typical swing into 50Ω loads and

provide an extremely fast rise/fall time guaranteed to be

less than 60ps.

The SY58031U operates from a 2.5V ±5% supply or 3.3V

±10% supply and is guaranteed over the full industrial

temperature range (40°C to +85°C). For applications that –

require highspeed 1:8 LVPECL fanout buffers, consider -

the SY58032U and SY58033U. The SY58031U is part of

Micrel’s highspeed, Precision Edge-® product line.

Datasheets and support documentation aron e available

Micrel’s web site at: www.micrel.com.

Block Diagram

Q1

/Q1

Q0

/Q0

IN

/IN

V

T

50Ω

50Ω

V

REF-AC

Q3

/Q3

Q2

/Q2

Q5

/Q5

Q4

/Q4

Q7

/Q7

Q6

/Q6

Precision Edge®

Features

•Precision 1:8, 400mV CML fanout buffer

•Guaranteed AC performance over temperature and

voltage:

−Clock frequency range: DC to >6GHz

−<60ps tr/tf time

−<270ps tpd

−<20ps outputoutput skew--to

•Low-jitter performance:

−75fsRMS phase jitter (typ.)

•50Ω-sourceterminated CML outputs

•400mV CML output swing into 50Ωload

•Fully differential I/O

•Accepts an input signal as low as 100mV

•Unique, patent-pending input termination and VT pin

accepts DCcoupled and ACcouple differential inputs--

(LVPECL, LVDS, and CML)

•Power supply 2.5V ±5% or 3.3V ±10%

•Industrial temperature range: –40°C to +85°C

•Available in 32-× pin, 5mm 5mm QFN package

Applications

•All SONET and GigE clock distribution

•All Fibre Channel clock and data distribution

•Network routing engine timing distribution

•High--end, lowskew multiprocessor synchronous clock

distribution

Precision Edge r is aegistered trademark oficrel, Inc. M

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