Precision Edge 2.5/3.3V 1:22 HIGH-PERFORMANCE, Micrel, Inc. SY89825U Precision Edge LOW-VOLTAGE PECL BUS CLOCK DRIVER SY89825U & TRANSLATOR w/ INTERNAL TERMINATION FEATURES LVPECL or LVDS input to 22 LVPECL outputs Precision Edge 100K ECL compatible outputs LVDS input includes 100 termination DESCRIPTION Guaranteed AC parameters over voltage: > 2GHz f (toggle) MAX The SY89825U is a High Performance Bus Clock Driver < 35ps max. ch-ch skew with 22 differential LVPECL output pairs. This part is Low voltage operation: 2.5V, 3.3V designed for use in low voltage (2.5V, 3.3V) applications which require a large number of outputs to drive precisely Temperature range: 40C to +85C aligned, ultra low skew signals to their destination. The Output enable pin input is multiplexed from either LVDS or LVPECL by the Available in a 64-Pin EPAD-TQFP CLK SEL pin. The LVDS input includes a 100 internal termination, thus eliminating the need for external termination. The Output Enable (OE) is synchronous so that the outputs will only be enabled/disabled when they APPLICATIONS are already in the LOW state. This eliminates any chance of generating a runt clock pulse when the device is enabled/ High-performance PCs disabled as can happen with an asynchronous control. The SY89825U features low pin-to-pin skew (35ps max.) Workstations performance previously unachievable in a standard Parallel processor-based systems product having such a high number of outputs. The Other high-performance computing SY89825U is available in a single space saving package Communications which provides a lower overall cost solution. In addition, a single chip solution improves timing budgets by eliminating the multiple device solution with their corresponding large part-to-part skew. Precision Edge is a registered trademark of Micrel, Inc. Rev.: D Amendment: /0 M9999-011907 1 Issue Date: January 2007 hbwhelp micrel.com or (408) 955-1690VCCO /Q6 Q6 /Q5 Q5 /Q4 Q4 /Q3 Q3 /Q2 Q2 /Q1 Q1 /Q0 Q0 VCCO Precision Edge Micrel, Inc. SY89825U PACKAGE/ORDERING INFORMATION (1) Ordering Information Package Operating Package Lead 64 63 62 61 60 59 58 57 56 55 54 53 52 51 50 49 Part Number Type Range Marking Finish VCCO 1 48 VCCO NC 2 47 Q7 SY89825UHI H64-1 Industrial SY89825UHI Sn-Pb NC 3 46 /Q7 VCCI 4 45 Q8 (2) SY89825UHITR H64-1 Industrial SY89825UHI SN-PB LVDS CLK 5 44 /Q8 /LVDS CLK 6 43 Q9 (3) CLK SEL 7 42 /Q9 64-Pin SY89825UHY H64-1 Industrial SY89825UHY with Pb-Free LVPECL CLK 8 41 Q10 EPAD-TQFP /LVPECL CLK 9 40 /Q10 Pb-Free bar-line indicator Matte-Sn (Top View) GND 10 39 Q11 (2,3) OE 11 38 /Q11 SY89825UHYTR H64-1 Industrial SY89825UHY with Pb-Free NC 12 37 Q12 Pb-Free bar-line indicator Matte-Sn NC 13 36 /Q12 /Q21 14 35 Q13 Q21 15 34 /Q13 Notes: VCCO 16 33 VCCO 1. Contact factory for die availability. Dice are guaranteed at T = 25C, DC electricals only. A 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 2. Tape and Reel. 3. Pb-Free package recommended for new designs. 64-Pin EPAD-TQFP (H64-1) LOGIC SYMBOL PIN NAMES Pin Function CLK SEL LVDS CLK, Differential LVDS Inputs /LVDS CLK (Internal 100 termination included) LVDS CLK 0 LVPECL CLK, Differential LVPECL Inputs. /LVDS CLK 22 /LVPECL CLK Q0 - Q21 22 CLK SEL Input CLK Select (LVTTL) /Q0 - /Q21 LVPECL CLK OE Output Enable (LVTTL) 1 Q Q , /Q /Q Differential LVPECL Outputs. LEN /LVPECL CLK 0 21 0 21 Terminate with 50 to V -2V CC Q GND Ground OE D V Power Supply. Connect to CCI V on PCB. V and V are not CC CCI CCO internally connected V Power Supply for Output Buffer. CCO Connect to V on PCB. V and CCI CCI V are not internally connected CCO M9999-011907 2 hbwhelp micrel.com or (408) 955-1690 VCCO /Q20 Q20 /Q19 Q19 /Q18 Q18 /Q17 Q17 /Q16 Q16 /Q15 Q15 /Q14 Q14 VCCO