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SY89808LTI Datasheet(PDF) 1 Page - Micrel Semiconductor |
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SY89808LTI Datasheet(HTML) 1 Page - Micrel Semiconductor |
1 / 8 page 1 Precision Edge® SY89808L Micrel, Inc. M9999-091405 hbwhelp@micrel.com or (408) 955-1690 FEATURES s 9 differential HSTL (1.5V compatible) output pairs s 500MHz maximum clock frequency s Triple-buffered enable function s 3.3V core supply, 1.8V output supply for reduced power s LVPECL and HSTL inputs s HSTL outputs drive 50 Ω to ground with no offset voltage s Low pin-to-pin skew (25ps max.) s Guaranteed over industrial –40 °C to +85°C temperature range s Available in 32-pin TQFP package The SY89808L is a High-Performance Bus Clock Driver with 9 differential HSTL (High-Speed Transceiver Logic) 1.5V compatible output pairs. The part is designed for use in low- voltage (3.3V/1.8V) applications which require a large number of outputs to drive precisely aligned, ultra-low skew signals to their destination. The input is multiplexed from either HSTL or LVPECL (Low-Voltage Positive-Emitter-Coupled Logic) by the CLK_SEL pin. The Output Enable (OE) is synchronous and triple-buffered so that the outputs will only be enabled/disabled when they are already in the LOW state. This avoids any potential of generating a runt clock pulse when the device is enabled/disabled, as can occur with an asynchronous control. The triple-buffering feature provides a three-clock delay from the time the OE input is asserted/de-asserted to when the clock appears at the outputs. The SY89808L features an ultra-low pin-to-pin skew of less than 25ps. The SY89808L is available in a 32-TQFP space saving package, enabling a lower overall cost solution. 3.3V, 500MHz, 1:9 DIFFERENTIAL HSTL (1.5V) FANOUT BUFFER/ TRANSLATOR DESCRIPTION Precision Edge® SY89808L LOGIC SYMBOL APPLICATIONS s Workstations s Parallel processor-based systems s High-performance computing s Communications CLK_SEL HSTL_CLK /HSTL_CLK LVPECL_CLK /LVPECL_CLK OE 0 1 9 9 Q0 — Q8 /Q0 — /Q8 EN ENABLE LOGIC Rev.: E Amendment: /0 Issue Date: September 2005 Precision Edge® TYPICAL PERFORMANCE 200 300 400 500 600 700 800 900 FREQUENCY (MHz) Output Amplitude vs. Frequency Precision Edge is a registered trademark of Micrel, Inc. TRUTH TABLE OE(1) CLK_SEL Q0 – Q8 /Q0 – /Q8 0 0 LOW HIGH 0 1 LOW HIGH 1 0 HSTL_CLK /HSTL_CLK 1 1 LVPECL_CLK /LVPECL_CLK Notes: 1. The OE (output enable) signal is synchronized with the low level of the HSTL_CLK and LVPECL_CLK signal. |
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