SY89645LK4G

SY89645L Precision Low Skew, 1-to-4 LVCMOS/LVTTL-to-LVDS Fanout Buffer General Description The SY89645L is a 3.3V, fully differential, low skew, 1:4 LVDS fanout buffer that accepts LVTTL or LVCMOS inputs. It is capable of processing clock signals as fast as 650MHz. The LVDS signals are optimized to provide less than 40ps of output skew. The single-ended input takes a 3.3V LVTTL or LVCMOS, with a signal swing as small as 1.2V. The outputs are 280mV LVDS, with fast rise and fall times, guaranteed to be less than 400ps. The SY89645L operates from a 3.3V + 5% power supply and is guaranteed over the full industrial temperature range (–40°C to +85°C). The SY89645L is part of Micrel’s Precision Edge® product line. Data sheets and support documentation can be found on Micrel’s web site at: www.micrel.com. Precision Edge® Features • • • • • • • • • • Four identical LVDS outputs CLKIN accepts LVCMOS or LVTTL input levels Maximum output frequency: 650MHz Translates LVCMOS/LVTTL input signals to LVDS levels 2V; TA = 25°C, RL = 100Ω across output pair; unless otherwise stated. June 2011 6 M9999-060711 hbwhelp@micrel.com or (408) 955-1690 Micrel, Inc. SY89645L Single-Ended and Differential Swings Figure 1a. Single-Ended Voltage Swing Figure 1b. Differential Voltage Swing June 2011 7 M9999-060711 hbwhelp@micrel.com or (408) 955-1690 Micrel, Inc. SY89645L LVDS Output Interface Applications LVDS specifies a small swing of 280mV typical, on a nominal 1.25V common mode above ground. The common mode voltage has tight limits to permit large variations in ground between an LVDS driver and receiver. Also, change in common mode voltage, as a function of data input, is kept to a minimum, to keep EMI low. Figure 2a. LVDS Differential Measurement Figure 2b. LVDS Common-Mode Measurement June 2011 8 M9999-060711 hbwhelp@micrel.com or (408) 955-1690 Micrel, Inc. SY89645L Package Information 20-Pin TSSOP (MM) MICREL, INC. 2180 FORTUNE DRIVE SAN JOSE, CA 95131 USA TEL +1 (408) 944-0800 FAX +1 (408) 474-1000 WEB http://www.micrel.com Micrel makes no representations or warranties with respect to the accuracy or completeness of the information furnished in this data sheet. This information is not intended as a warranty and Micrel does not assume responsibility for its use. Micrel reserves the right to change circuitry, specifications and descriptions at any time without notice. No license, whether express, implied, arising by estoppel or otherwise, to any intellectual property rights is granted by this document. Except as provided in Micrel’s terms and conditions of sale for such products, Micrel assumes no liability whatsoever, and Micrel disclaims any express or implied warranty relating to the sale and/or use of Micrel products including liability or warranties relating to fitness for a particular purpose, merchantability, or infringement of any patent, copyright or other intellectual property right. Micrel Products are not designed or authorized for use as components in life support appliances, devices or systems where malfunction of a product can reasonably be expected to result in personal injury. Life support devices or systems are devices or systems that (a) are intended for surgical implant into the body or (b) support or sustain life, and whose failure to perform can be reasonably expected to result in a significant injury to the user. A Purchaser’s use or sale of Micrel Products for use in life support appliances, devices or systems is a Purchaser’s own risk and Purchaser agrees to fully indemnify Micrel for any damages resulting from such use or sale. © 2006 Micrel, Incorporated. June 2011 9 M9999-060711 hbwhelp@micrel.com or (408) 955-1690