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8344BYLF Datasheet(PDF) 1 Page - Integrated Device Technology |
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8344BYLF Datasheet(HTML) 1 Page - Integrated Device Technology |
1 / 18 page 8344BY 1 REV. A JANUARY 5, 2011 ICS8344 LOW SKEW, 1-TO-24 DIFFERENTIAL-TO-LVCMOS FANOUT BUFFER GENERAL DESCRIPTION The ICS8344 is a low voltage, low skew, 1-to-24 Differential- to-LVCMOS Fanout Buffer. The ICS8344 is designed to trans- late any differential signal levels to LVCMOS levels. The low impedance LVCMOS outputs are designed to drive 50 Ω se- ries or parallel terminated transmission lines. The effective fanout can be increased to 48 by utilizing the ability of the outputs to drive two series terminated lines. Redundant clock applications can make use of the dual clock input. The dual clock inputs also facilitate board level testing. ICS8344 is characterized at full 3.3V, full 2.5V and mixed 3.3V input and 2.5V output operating supply modes. Guaranteed output and part-to-part skew characteristics make the ICS8344 ideal for those clock distribution applica- tions demanding well defined performance and repeatability. FEATURES • Twenty-four LVCMOS outputs, 7Ω typical output impedance • Selectable differential clock input pairs for redundant clock applications • CLKx, nCLKx pairs can accept the following differential input levels: LVDS, LVPECL, LVHSTL, SSTL, HCSL • Maximum output frequency: 167MHz • Translates any differential input signal (LVPECL, LVHSTL, LVDS) to LVCMOS without external bias networks • Translates any single-ended input signal to LVCMOS with resistor bias on nCLK input • Multiple output enable pins for disabling unused outputs in reduced fanout applications • Output skew: 275ps (maximum) • Part-to-part skew: 600ps (maximum) • Bank skew: 150ps (maximum) • Propagation Delay: 4.3ns (maximum) • 3.3V, 2.5V or mixed 3.3V, 2.5V operating supply modes • 0°C to 70°C ambient operating temperature • Available in standard (RoHS 5) and lead-free (RoHS 6) packages BLOCK DIAGRAM PIN ASSIGNMENT 48 47 46 45 44 43 42 41 40 39 38 37 13 14 15 16 17 18 19 20 21 22 23 24 1 2 3 4 5 6 7 8 9 10 11 12 36 35 34 33 32 31 30 29 28 27 26 25 Q16 Q17 VDDO GND Q18 Q19 Q20 Q21 VDDO GND Q22 Q23 Q7 Q6 VDDO GND Q5 Q4 Q3 Q2 VDDO GND Q1 Q0 CLK0 nCLK0 OE1 OE2 OE3 Q0:Q7 O8:Q15 O16:Q23 CLK_SEL CLK1 nCLK1 48-Lead LQFP 7mm x 7mm x 1.4mm package body Y Package Top View ICS8344 0 1 |
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