datasheet low skew 1 to 4 clock buffer ics524 idt? / ics? low skew 1 to 4 clock buffer 1 ics524 rev c 021909 description the ics524 is a low skew, single input to four output, clock buffer. part of idt?s clockblocks tm family, this is our lowest skew, small clock buffer. see the ics552-02 for a 1 to 8 low skew buffer. for more than eight outputs, see the mk74cbxxx buffalo tm series of clock drivers. 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 ? extremely low skew outputs (50 ps maximum) ? packaged in 8-pin soic ? available in pb (lead) free package ? low power cmos technology ? operating voltages of 2.5 v to 5 v ? 5 v tolerant input clock ? industrial temperature range block diagram q0 iclk q1 q2 q3
ics524 low skew 1 to 4 clo ck buffer fan out buffer idt? / ics? low skew 1 to 4 clock buffer 2 ics524 rev c 021909 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 5 and gnd on pin 8, as close to the device as possible. a 33 ? series terminating resistor may be used on each clock output if the trace is longer than 1 inch. to achieve the low output skew that the ics524 is capable of, careful attention must be paid to board layout. essentially, all four outputs must have identical terminations, identical loads an d identical trace geometries. if they do not, the output skew will be degr aded. for example, 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 vdd 4 q0 q1 q3 gnd q2 iclk 8 7 6 5 nc 8-pin soic pin number pin name pin type pin description 1 iclk input clock input, 5v tolerant input. 2 q0 output clock output 0. 3 q1 output clock output 1. 4 nc ? internal no connect. 5 vdd power connect to +2.5 v, +3.3 v or +5.0 v. 6 q2 output clock output 2. 7 q3 output clock output 3. 8 gnd power connect to ground.
ics524 low skew 1 to 4 clo ck buffer fan out buffer idt? / ics? low skew 1 to 4 clock buffer 3 ics524 rev c 021909 absolute maximum ratings stresses above the ratings listed below can cause perm anent damage to the ics524. these ratings, which are standard values for idt commercially rated parts, are stress ratings only. functional operation of the device at these or any other conditions above those indicated in the operational sections of the specifications is not implied. exposure to absolute maximum rating conditions for exte nded periods can affect product reliability. electrical parameters are guaranteed only over the recommended operating temperature range. recommended operation conditions dc electrical characteristics vdd=2.5 v 5% , ambient temperature -40 to +85 c, unless stated otherwise item rating supply voltage, vdd 7 v outputs -0.5 v to vdd+0.5 v iclk -0.5 v to 5.5 v ambient operating temperature -40 to +85 c storage temperature -65 to +150 c junction temperature 125 c soldering temperature 260 c parameter min. typ. max. units ambient operating temperature -40 +85 c power supply voltage (measured in respect to gnd) +2.375 +5.25 v parameter symbol conditions min. typ. max. units operating voltage vdd 2.375 2.625 v input high voltage, iclk v ih note 1 vdd/2+0.5 5.5 v input low voltage, iclk v il note 1 vdd/2-0.5 v output high voltage v oh i oh = -16 ma 2 v output low voltage v ol i ol = 16 ma 0.4 v operating supply current idd no load, 135 mhz 25 ma nominal output impedance z o 20 ? input capacitance c in iclk 5 pf short circuit current i os 28 ma
ics524 low skew 1 to 4 clo ck buffer fan out buffer idt? / ics? low skew 1 to 4 clock buffer 4 ics524 rev c 021909 dc electrical characteristics (continued) vdd=3.3 v 5% , ambient temperature -40 to +85 c, unless stated otherwise vdd=5 v 5% , ambient temperature -40 to +85 c, unless stated otherwise notes: 1. nominal switching threshold is vdd/2 parameter symbol conditions min. typ. max. units operating voltage vdd 3.15 3.45 v input high voltage, iclk v ih note 1 vdd/2+0.7 5.5 v input low voltage, iclk v il note 1 vdd/2-0.7 v output high voltage v oh i oh = -25 ma 2.4 v output low voltage v ol i ol = 25 ma 0.4 v output high voltage (cmos level) v oh i oh = -12 ma vdd-0.4 v operating supply current idd no load, 135 mhz 35 ma nominal output impedance z o 20 ? input capacitance c in iclk 5 pf short circuit current i os 50 ma parameter symbol conditions min. typ. max. units operating voltage vdd 4.75 5.25 v input high voltage, iclk v ih note 1 vdd/2+1 5.5 v input low voltage, iclk v il note 1 vdd/2-1 v output high voltage v oh i oh = -35 ma 2.4 v output low voltage v ol i ol = 35 ma 0.4 v output high voltage (cmos level) v oh i oh = -12 ma vdd-0.4 v operating supply current idd no load, 135 mhz 45 ma nominal output impedance z o 20 ? input capacitance c in iclk 5 pf short circuit current i os 80 ma
ics524 low skew 1 to 4 clo ck buffer fan out buffer idt? / ics? low skew 1 to 4 clock buffer 5 ics524 rev c 021909 ac electrical characteristics vdd = 2.5 v 5% , ambient temperature -40 to +85 c, unless stated otherwise vdd = 3.3 v 5% , ambient temperature -40 to +85 c, unless stated otherwise vdd = 5 v 5% , ambient temperature -40 to +85 c, unless stated otherwise notes: 1. with rail to rail input clock 2. between any 2 outputs with equal loading. 3. duty cycle on outputs will match incoming clock duty cycle. consult idt for tight duty cycle clock generators. thermal characteristics parameter symbol conditions min. typ. max. units input frequency 0 200 mhz output rise time t or 0.8 to 2.0 v, c l =15 pf 1.0 1.5 ns output fall time t of 2.0 to 0.8 v, c l =15 pf 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 50 ps device to device skew rising edges at vdd/2 500 ps parameter symbol conditions min. typ. max. units input frequency 0 200 mhz output rise time t or 0.8 to 2.0 v, c l =15 pf 0.6 1.0 ns output fall time t of 2.0 to 0.8 v, c l =15 pf 0.6 1.0 ns propagation delay note 1 2.0 2.4 4 ns output to output skew note 2 rising edges at vdd/2 0 50 ps device to device skew rising edges at vdd/2 500 ps parameter symbol conditions min. typ. max. units input frequency 0 200 mhz output rise time t or 0.8 to 2.0 v, c l =15 pf 0.3 0.7 ns output fall time t of 2.0 to 0.8 v, c l =15 pf 0.3 0.7 ns propagation delay note 1 1.8 2.5 4 ns output to output skew note 2 rising edges at vdd/2 0 50 ps device to device skew rising edges at vdd/2 500 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
ics524 low skew 1 to 4 clo ck buffer fan out buffer idt? / ics? low skew 1 to 4 clock buffer 6 ics524 rev c 021909 package outline and package dimensions (8-pin soic, 150 mil. narrow body) package dimensions are kept current with jedec publication no. 95 ordering information parts that are ordered with a "lf" suffix to the part nu mber are the pb-free configur ation and are rohs compliant. while the information presented herein has been checked for both accuracy and reliability, integrated device technology (idt) r esult from its use. no other circuits, patents, or li censes are implied. this product is intended for use in normal commercial application s. any other applications such as those requiring exte nded temperature range, high reliability, or other extraordinary environmental require ments are not recommended without additional processing by idt. idt reserves the right to change any circui try or specifications without notice. idt does not authorize or warrant any idt product for use in life support devices or critical medical instruments. part / order number marking shipping packaging package temperature 524MILF 524MILF tubes 8-pin soic -40 to +85 c 524MILFt 524MILF tape and reel 8-pin soic -40 to +85 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. cont rolling 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 0.33 0.51 .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 0.25 0.50 .010 .020 l 0.40 1.27 .016 .050 0 8 0 8
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