SY89835U 2.5V, 2GHz (3.2 Gbps) Ultra-Precision, Differential 1:2 LVDS Fanout Buffer with Internal Termination and Fail Safe Input General Description The SY89835U is a 2.5V, high-speed 2GHz differential Precision Edge Low Voltage Differential Swing (LVDS) 1:2 fanout buffer Features optimized for ultra-low skew applications. Within device skew is guaranteed to be less than 20ps over supply Guaranteed AC performance over temperature and voltage and temperature. A unique Fail-Safe Input (FSI) voltage: protection prevents metastable conditions when no DC-to > 3.2Gbps throughput signal is present or when the selected input clock fails to 210ps typical propagation delay (IN-to-Q) a DC voltage (voltage between the pins of the <20ps within-device skew differential input drops sufficiently below 100 mV). <150ps rise/fall times The SY89835U is part of Micrels high-speed clock Fail Safe Input synchronization family. For applications that require a Prevents outputs from oscillating different I/O combination, consult Micrels web site, and choose from a comprehensive product line of high- Ultra-low jitter design speed, low-skew fanout buffers, translators and clock <1ps cycle-to-cycle jitter RMS generators. <10ps total jitter PP Data sheets and support documentation can be found <1ps random jitter RMS on Micrels web site at: www.micrel.com. <10ps deterministic jitter PP High-speed LVDS outputs Functional Block Diagram 2.5V 5% power supply operation Industrial temperature range: 40C to +85C Available in 8-pin (2mm x 2mm) MLF package Applications Clock or data distribution SONET clock or data distribution Fibre Channel clock or data distribution Gigabit Ethernet clock or data distribution Markets DataCom Telecom Storage ATE Precision test and measurement Precision Edge is a registered trademark of Micrel, Inc. MLF and MicroLeadFrame are trademarks of Amkor Technology, Inc. Micrel Inc. 2180 Fortune Drive San Jose, CA 95131 USA tel +1 (408) 944-0800 fax + 1 (408) 474-1000 Micrel, Inc. SY89835U (1) Ordering Information Part Number Package Operating Package Marking Lead Type Range Finish SY89835UMG MLF-8 Industrial 835 with Pb-Free NiPdAu bar-line indicator Pb-Free (2) SY89835UMGTR MLF-8 Industrial 835 with Pb-Free NiPdAu bar-line indicator Pb-Free Notes: 1. Contact factory for die availability. Dice are guaranteed at TA = 25C, DC Electricals only. 2. Tape and Reel. Pin Configuration 8-Pin MLF (MLF-8) Pin Description Pin Number Pin Name Pin Function 1 VCC Positive Power Supply: Bypass with 0.1F//0.01F low ESR capacitor and place as close to VCC pin as possible. Power supply tolerance is 5%. 2, 3 IN, /IN Differential Inputs: This input pair is the differential signal input to the device. Input accepts DC-Coupled differential signals as small as 100mV (200mV ). The input is PP internally terminated with 100 between IN and /IN. If the input swing falls below a certain threshold (typically 30mV), the Fail Safe Input (FSI) feature will guarantee a stable output by latching the output to its last valid state. Please refer to the Input Interface Applications section for more details. 4 GND Ground. GND pins and exposed pad must be connected to the most negative potential of the device ground. 5, 6 /Q1, Q1 Differential Outputs (LVDS): Normally terminated with 100 across the pair (Q, /Q). 7, 8 /Q0, Q0 See LVDS Outputs section, Figure 2a. Truth Table IN /IN Q /Q 0 1 0 1 1 0 1 0 2 M9999-020706 February 2006 hbwhelp micrel.com or (408) 955-1690