datasheet low skew 1 to 4 clock buffer ics651b idt? / ics? low skew 1 to 4 clock buffer 1 ics651b rev b 112509 description the ics651b is a low skew, single input to four output, clock buffer. part of idt?s clockblocks tm family, this is a low skew, small clock buffer. idt makes many non-pll and pll based low skew output devices as well as zero delay buffers to synchronize clocks. contact us for all of your clocking needs. features ? low skew outputs (250 ps) ? packaged in 8-pin soic ? rohs 5 (green) or rohs 6 (green and lead-free) package ? low power cmos technology ? operating voltages of 1.5 v to 2.5 v ? output enable pin tri-states outputs ? 3.3 v tolerant input clock block diagram q0 iclk q1 q2 q3 output enable
ics651b low skew 1 to 4 clo ck buffer fan out buffer idt? / ics? low skew 1 to 4 clock buffer 2 ics651b rev b 112509 pin assignment pin descriptions external components a minimum number of external components are required for proper operation. a decoupling capacitor of 0.01 f should be connected between vdd on pin 7 and gnd on pin 6, as close to the device as possible. a 33 ? series terminating resistor may be used on each cloc k output if the trace is longer than 1 inch. to achieve the low output skew that the ics651b is capable of, careful attention must be paid to board layout. essentially, all four outputs must have identical terminations, iden tical loads and identical trace geometries. if they do not, the output skew will be de graded. for examp le, using a 30 ? series termination on one output (with 33 ? on the others) will ca use at least 15 ps of skew. 1 2 3 4 5 6 7 8 iclk q1 q2 q3 q4 oe vdd gnd pin number pin name pin type pin description 1 iclk input clock input. 3.3 v tolerant input. 2 q1 output clock output 1. 3 q2 output clock output 2. 4 q3 output clock output 3. 5 q4 output clock output 4. 6 gnd power connect to ground. 7 vdd power connect to +1.5 v or +2.5 v. 8 oe input output enable. tri-states outputs w hen low. connect to vdd for normal operation.
ics651b low skew 1 to 4 clo ck buffer fan out buffer idt? / ics? low skew 1 to 4 clock buffer 3 ics651b rev b 112509 absolute maximum ratings stresses above the ratings listed below can cause perman ent damage to the ics651b. these ratings, which are standard values for idt commercially rated parts, are stress ratings only. functional operati on of the device at these or any other conditions above those indicated in the operat ional sections of the specif ications is not implied. exposure to absolute maximum rating conditions for extended periods can affect product re liability. electrical parameters are guaranteed only over the recommended operating temperature range. recommended operation conditions item rating supply voltage, vdd 7 v output enable and all outputs -0.5 v to vdd+0.5 v iclk -0.5 v to 3.6 v (vdd > 0v) ambient operating temperature 0 to +70 c storage temperature -65 to +150 c junction temperature 125 c soldering temperature 260 c parameter min. typ. max. units ambient operating temperature 0 +70 c power supply voltage (measured in respect to gnd) +1.425 +2.625 v
ics651b low skew 1 to 4 clo ck buffer fan out buffer idt? / ics? low skew 1 to 4 clock buffer 4 ics651b rev b 112509 dc electrical characteristics vdd=1.5 v 5% , ambient temperature 0 to +70 c, unless stated otherwise notes: 1. nominal switching threshold is vdd/2 vdd=2.5 v 5% , ambient temperature 0 to +70 c, unless stated otherwise notes: 1. nominal switching threshold is vdd/2 parameter symbol conditions min. typ. max. units operating voltage vdd 1.425 1.575 v input high voltage v ih note 1, iclk 1.17 3.6 v oe vdd+0.5 v input low voltage v il note 1, iclk, oe 0.63 v output high voltage v oh i oh = -6 ma 1.35 v output low voltage v ol i ol = 6 ma 0.45 v operating supply current idd no load, 133 mhz 25 ma nominal output impedance z o 20 ? input capacitance c in iclk, oe pin 5 pf short circuit current i os 28 ma parameter symbol conditions min. typ. max. units operating voltage vdd 2.375 2.625 v input high voltage v ih note 1, iclk 1.7 3.6 v oe vdd+0.5 v input low voltage v il note 1, iclk, oe 0.7 v output high voltage v oh i oh = -8 ma 2 v output low voltage v ol i ol = 8ma 0.4 v operating supply current idd no load, 133 mhz 50 ma nominal output impedance z o 20 ? input capacitance c in iclk, oe pin 5 pf short circuit current i os 50 ma
ics651b low skew 1 to 4 clo ck buffer fan out buffer idt? / ics? low skew 1 to 4 clock buffer 5 ics651b rev b 112509 ac electrical characteristics vdd = 1.5 v 5% , ambient temperature 0 to +70 c, unless stated otherwise vdd = 2.5 v 5% , ambient temperature 0 to +70 c, unless stated otherwise notes: 1. with rail to rail input clock 2. between any 2 outputs with equal loading. thermal characteristics parameter symbol conditions min. typ. max. units input frequency 0 166 mhz output rise time t or 0.63 v to 1.17 v 1.0 1.5 ns output fall time t of 1.17 v to 0.63 v 1.0 1.5 ns propagation delay note 1 2.2 3 5 ns output to output skew note 2 rising edges at vdd/2 0 250 ps parameter symbol conditions min. typ. max. units input frequency 0 200 mhz output rise time t or 0.7 v to 1.7 v 1.0 1.5 ns output fall time t of 1.7 v to 0.7 v 1.0 1.5 ns propagation delay note 1 2.2 3 5 ns output to output skew note 2 rising edges at vdd/2 0 250 ps parameter symbol conditions min. typ. max. units thermal resistance junction to ambient ja still air 150 c/w ja 1 m/s air flow 140 c/w ja 3 m/s air flow 120 c/w thermal resistance junction to case jc 40 c/w case temperature 120 c thermal resistance junction to top of case jt still air 20 c/w
ics651b low skew 1 to 4 clo ck buffer fan out buffer idt? / ics? low skew 1 to 4 clock buffer 6 ics651b rev b 112509 package outline and package dimensions (8-pin soic, 150 mil. narrow body) package dimensions are kept current with jedec publication no. 95 ordering information ?lf? suffix to the part number are the pb -free configuration and are rohs compliant. while the information presented herein has been checked for both accuracy and reliability, integrated device technology (idt) result from its use. no other circuits, patents, or licenses are implied. this product is intended for use in normal commercial applications. any other applications such as those requiring ex tended temperature range, high reliability, or other extraordina ry environmental requirements are not recommended without additional processing by idt. idt reserves the right to change any circuitry or specifications without notice. idt does not authorize or warrant any idt product for use in life support devices o r critical medical instruments. part / order number marking shipping packaging package temperature 651BMLF 651BMLF tubes 8-pin soic 0 to +70 c 651BMLFt 651BMLF tape and reel 8-pin soic 0 to +70 c index area 1 2 8 d e seating plane a1 a e - c - b .10 (.004) c c l h h x 45 *for reference only. controlling dimensions in mm. millimeters inches* symbol min max min max a 1.35 1.75 .0532 .0688 a1 0.10 0.25 .0040 .0098 b 0.330.51.013.020 c 0.19 0.25 .0075 .0098 d 4.80 5.00 .1890 .1968 e 3.80 4.00 .1497 .1574 e 1.27 basic 0.050 basic h 5.80 6.20 .2284 .2440 h 0.250.50.010.020 l 0.401.27.016.050 0 8 0 8
ics651b low skew 1 to 4 clo ck buffer fan out buffer idt? / ics? low skew 1 to 4 clock buffer 7 ics651b rev b 112509 revision history rev. originator date description of change a k. beckmeyer 12/15/05 preliminary datasheet release; new device. b lpl 11/25/09 released to final.
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