SY89228U 1GHz Precision, LVPECL 3, 5 Clock Divider with Fail-Safe Input and Internal Termination General Description The SY89228U is a precision, low jitter 1GHz 3, 5 Precision Edge clock divider with an LVPECL output. A unique Fail- Features Safe Input (FSI) protection prevents metastable Accepts a high-speed input and provides a precision output conditions when the input clock voltage swing 3 and 5 sub-rate, LVPECL output drops significantly below 100mV or input is removed. Fail-Safe Input The differential input includes Micrels unique, 3-pin internal termination architecture that allows the input Prevents oscillations when input is invalid to interface to any differential signal (AC- or DC- Guaranteed AC performance over temperature and coupled) as small as 100mV (200mV ) without any PP supply voltage: level shifting or termination resistor networks in the DC-to >1.0GHz throughput signal path. The outputs are 800mV, 100K- < 1500ps Propagation Delay (In-to-Q) compatible LVPECL with fast rise/fall times < 270ps Rise/Fall times guaranteed to be less than 270ps. Ultra-low jitter design: The SY89228U operates from a 2.5V 5% or 3.3V <1ps random jitter RMS 10% supply and is guaranteed over the full <1ps cycle-to-cycle jitter RMS industrial temperature range of 40C to +85C. The <10ps total jitter (clock) PP SY89228U is part of Micrels high-speed, Precision <0.7ps MUX crosstalk induced jitter RMS Edge product line. Unique patented internal termination and VT pin All support documentation can be found on Micrels accepts DC- and AC-coupled inputs (CML, PECL, web site at: www.micrel.com. LVDS) Wide input voltage range VCC to GND 800mV LVPECL output Block Diagram 46% to 54% Duty Cycle( 3) 47% to 53% Duty Cycle( 5) 2.5V 5% or 3.3V 10% supply voltage -40C to +85C industrial temperature range Available in 16-pin (3mm x 3mm) QFN package Applications Fail-safe clock protection Markets LAN/WAN Enterprise servers ATE Test and measurement United States Patent No. RE44,134 Precision Edge is a registered trademark of Micrel, Inc. Micrel Inc. 2180 Fortune Drive San Jose, CA 95131 USA tel +1 (408) 944-0800 fax + 1 (408) 474-1000 Micrel, Inc. SY89228U (1) Ordering Information Part Number Package Operating Package Marking Lead Type Range Finish 228U with NiPdAu SY89228UMG QFN-16 Industrial Pb-Free bar-line Indicator Pb-Free 228U with NiPdAu (2) SY89228UMGTR QFN-16 Industrial Pb-Free bar-line Indicator Pb-Free Notes: 1. Contact factory for die availability. Dice are guaranteed at T = 25C, DC Electricals Only. A 2. Tape and Reel. Pin Configuration 16-Pin QFN August 2007 2 M9999-080707-A hbwhelp micrel.com or (408) 955-1690