datasheet low skew 1 to 4 clock buffer ics553 idt? low skew 1 to 4 clock buffer 1 ics553 rev n 051310 description the ics553 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 ? pb (lead) free package ? low power cmos technology ? operating voltages of 2.5 v to 5 v ? output enable pin tri-states outputs ? 5 v tolerant input clock ? commercial (0 to +70c) and industrial (-40 to +85c) temperature ranges available block diagram q0 iclk q1 q2 q3 output enable
ics553 low skew 1 to 4 clo ck buffer fan out buffer idt? low skew 1 to 4 clock buffer 2 ics553 rev n 051310 pin assignment pin descriptions external components a minimum number of external components are requir ed for proper operation. a decoupling capacitor of 0.01 f should be connected between vdd on pin 1 and gnd on pin 4, 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 ics553 is capable of, careful attention must be paid to board layout. essentially, all four outputs must have identical terminations, identical loads and identical trace geometries. if they do not, the output skew will be deg raded. for example, using a 30 series termination on one output (with 33 on the others) w ill cause at least 15 ps of skew. 1 2 3 vdd 4 q0 q1 q3 gnd q2 iclk 8 7 6 5 oe 8-pin soic pin number pin name pin type pin description 1 vdd power connect to +2.5 v, +3.3 v or +5.0 v. 2 q0 output clock output 0. 3 q1 output clock output 1. 4 gnd power connect to ground. 5 iclk input clock input, 5 v tolerant input. 6 q2 output clock output 2. 7 q3 output clock output 3. 8 oe input output enable. tri-states outputs w hen low. connect to vdd for normal operation.
ics553 low skew 1 to 4 clo ck buffer fan out buffer idt? low skew 1 to 4 clock buffer 3 ics553 rev n 051310 absolute maximum ratings stresses above the ratings listed below can cause per manent damage to the ics553 . these ratings, which are standard values for idt commercially rated parts, ar e 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. ex posure to absolute maximum rating conditions for extended periods can affect product reliability. electr ical parameters are guar anteed 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 output enable and all outputs -0.5 v to vdd+0.5 v iclk -0.5 v to 5.5 v ambient operating temperature (commercial) 0 to +70 c ambient operating temperature (industrial) -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 (commercial) 0 +70 c ambient operating temperature (industrial) -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 input high voltage, oe v ih 1.8 vdd v input low voltage, oe v il 0.7 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, oe pin 5 pf short circuit current i os 28 ma
ics553 low skew 1 to 4 clo ck buffer fan out buffer idt? low skew 1 to 4 clock buffer 4 ics553 rev n 051310 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 input high voltage, oe v ih 2vddv input low voltage, oe v il 0.8 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, oe pin 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 input high voltage, oe v ih 2vddv input low voltage, oe v il 0.8 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, oe pin 5 pf short circuit current i os 80 ma
ics553 low skew 1 to 4 clo ck buffer fan out buffer idt? low skew 1 to 4 clock buffer 5 ics553 rev n 051310 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 ou tputs will match incomi ng clock duty cycle. consult idt for tight duty cycle clock generators. 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 additive period jitter 1 ps 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 additive period jitter 1 ps 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 additive period jitter 1 ps 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
ics553 low skew 1 to 4 clo ck buffer fan out buffer idt? low skew 1 to 4 clock buffer 6 ics553 rev n 051310 thermal characteristics marking diagrams notes: 1. ?lot? is the lot number. 2. yyww is the last two digits of the year and week that the part was assembled. 3 ?lf? denotes rohs compliant package. 4. ?i? denotes industrial temperature range device. 5. bottom marking: country of origin. 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 14 5 8 553mlf lot yyww 14 5 8 553milf lot yyww
ics553 low skew 1 to 4 clo ck buffer fan out buffer idt? low skew 1 to 4 clock buffer 7 ics553 rev n 051310 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 bot h 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 re liability, or other extraordina ry environmental requirements are not recomm ended 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 553mlf 553mlf tubes 8-pin soic 0 to +70 c 553mlft 553mlf tape and reel 8-pin soic 0 to +70 c 553milf 553milf tubes 8-pin soic -40 to +85 c 553milft 553milf 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. 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 0.33 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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