SY89221U Precision 1:15 LVPECL Fanout Buffer with 2:1 MUX and Four 1/2/4 Clock Divider Output Banks General Description Features The SY89221U is a 2.5/3.3V precision, high-speed, Four low-skew LVPECL output banks with integrated clock divider and LVPECL fanout buffer independently programmable 1, 2 and 4 divider capable of handling clocks up to 1.5GHz. Optimized options for communications applications, the four Four output banks, 15 total outputs independently controlled output banks are phase- Guaranteed AC performance over temperature and matched and can be configured for pass through 1, voltage: 2 or 4 divider ratios. Accepts a clock frequency up to 1.5GHz The differential input includes Micrels unique, 3-pin <1600ps IN-to-OUT propagation delay input termination architecture that allows the user to <270ps rise/fall time interface to any differential signal (AC- or DC-coupled) <35 ps within-bank skew as small as 100mV (200mV ) without any level PP shifting or termination resistor networks in the signal Fail Safe Input path. The low-skew, low-jitter outputs are LVPECL Prevents outputs from oscillating compatible with extremely fast rise/fall times that are Ultra-low jitter design: guaranteed to be less than 220ps. <1ps random jitter RMS The /MR (master reset) input asynchronously resets <10ps total jitter (clock) PP the outputs. A four-clock delay after de-asserting /MR Patent-pending input termination and VT pin allows the counters to synchronize and start the accepts DC- and AC-coupled inputs (CML, PECL, outputs from the same state without any runt pulse. LVDS) The SY89221U is part of Micrels Precision Edge CMOS/TTL-compatible output enable (EN) and product family. All support documentation can be divider select control found at Micrel s web site at: www.micrel.com. 2.5V 5% or 3.3V 10% power supply 40C to +85C temperature range Available in 64-pin TQFP Applications All SONET/SDH applications All Fibre Channel applications All Gigabit Ethernet applications Markets LAN/WAN routers/switches Enterprise servers Storage 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. SY89221U Functional Block Diagram M9999-082407-C August 2007 2 hbwhelp micrel.com or (408) 955-1690