datasheet low phase noise zero delay buffer ics571 idt? / ics? low phase noise zero delay buffer 1 ics571 rev f 062306 description the ics571 is a high speed, high output drive, low phase noise zero delay buffer (z db) which integrates ics? proprietary analog/digital phase locked loop (pll) techniques. ics introduced the world standard for these devices in 1992 with the debut of the av9170, and updated that with the ics570. the ics571, part of ics? clockblocks? family, was designed to operate at higher frequencies, with faster rise and fall times, and with lower phase noise. the zero delay feature means that the rising edge of the input clock aligns with the rising edges of both outputs, giving the appearance of no delay through the device. there are two outputs on the chip, one being a low-skew divide by two of the other. the chip is ideal for synchronizing outputs in a large variety of systems, from personal computers to data communications to video. by allowing offchip feedback paths, the ics571 can eliminate the delay through other devices. the use of dividers in the feedback path will enable the part to multiply by more than two. features ? packaged in 8-pin soic (pb free available) ? can function as low phase noise x2 multiplier ? low skew outputs. one is 2 of other ? input clock frequency up to 160 mhz at 3.3 v ? phase noise of better than -100 dbc/hz from 1 khz to 1 mhz offset from carrier ? can recover poor input clock duty cycle ? output clock duty cycle of 45/55 at 3.3 v ? high drive strength for >100 mhz outputs ? full cmos clock swings with 25 ma drive capability at ttl levels ? advanced, low power cmos process ? operating voltages of 3.0 to 5.5 v block diagram
ics571 low phase noise zero delay bu ffer zdb and multiplier/divider idt? / ics? low phase noise zero delay buffer 2 ics571 rev f 062306 pin assignment feedback configuration table an d frequency ranges (at 3.3 v) pin descriptions key: ci = clock input; i = input; o = output; p = power supply connection. feedback from clk clk/2 input range clk input clock frequency input clock frequency/2 20 to 160 mhz clk/2 2x input clock frequency input clock frequency 10 to 80 mhz pin number pin name pin type pin description 1 iclk ci reference clock input. 2 vdd p connect to +3.3 v or +5 v. must be same as other vdd. 3 gnd p connect to ground. 4 clk/2 o clock output per table above. low skew divide by two of pin 7 clock. 5 gnd p connect to ground. 6 vdd p connect to +3.3 v or +5 v. must be same as other vdd. 7 clk o clock output per table above. 8 fbin ci feedback clock input. connect to clk or clk/2 per table above.
ics571 low phase noise zero delay bu ffer zdb and multiplier/divider idt? / ics? low phase noise zero delay buffer 3 ics571 rev f 062306 external components the ics571 requires a minimum number of external components for proper operation. a decoupling capacitor of 0.01f must be connected between vdd and gnd on each side of the chip (between pins 2 and 3, and between pins 6 and 5). they must be connected close to the ics571 to minimize lead inductance. no external power supply filtering is required for this device. a 33 ? terminating resistor can be used next to each output pin. absolute maximum ratings stresses above the ratings listed below can cause perm anent damage to the ics571. these ratings, which are standard values for ics 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. item rating supply voltage, vdd, referenced to gnd 7 v inputs, referenced to gnd -0.5 v to vdd+0.5 v clock output, referenced to gnd -0.5 v to vdd+0.5 v storage temperature -65 to +150 c soldering temperature, max of 10 seconds 260 c ambient operating temperature 0 to +70 c
ics571 low phase noise zero delay bu ffer zdb and multiplier/divider idt? / ics? low phase noise zero delay buffer 4 ics571 rev f 062306 dc electrical characteristics unless stated otherwise, vdd = 5.0 v or 3.3 v , ambient temperature 0 to +70 c parameter symbol conditions min. typ. max. units operating supply voltage vdd 3 5.5 v input high voltage v ih iclk, fbin (pins 1 and 8) vdd/2+1 vdd/2 v input low voltage v il iclk, fbin (pins 1 and 8) vdd/2 vdd/2-1 v output high voltage, cmos level v oh i oh = -4 ma vdd-0.4 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 idd operating supply current, 133 in, 133 out no load, 3.3 v 34 ma idd operating supply current, 50 in, 100 out no load, 3.3 v 26 ma short circuit current i os each output 100 ma input capacitance c in iclk, fbin 5 pf
ics571 low phase noise zero delay bu ffer zdb and multiplier/divider idt? / ics? low phase noise zero delay buffer 5 ics571 rev f 062306 ac electrical characteristics unless stated otherwise, vdd = 5.0 v or 3.3 v , ambient temperature 0 to +70 c notes: 1. sresses beyond these can permanently damage the device. 2. assumes clocks with the same rise time, measured from rising edges at vdd/2. measured with 33 ? termination resistors and 15 pf loads. applies to both 3.3 v and 5 v operation. 3. clk/2 has lower jitter (both absolute and one sigma, in ps) than clk. thermal characteristics parameter symbol conditions min. typ. max. units input frequency, clock input f in fb from clk 20 160 mhz input frequency, clock input f in fb from clk/2 10 80 mhz skew clk/2 with respect to clk note 2 150 500 850 ps input clock to output connected to fbin note 2 -500 500 ps output clock rise time, 5 v 0.8 to 2.0 v, 15 pf load 0.3 ns output clock fall time, 5 v 2.0 to 0.8 v, 15 pf load 0.4 ns output clock rise time, 3.3 v 0.8 to 2.0 v, 15 pf load 0.45 ns output clock fall time, 3.3 v 2.0 to 0.8 v, 15 pf load 0.55 ns input clock duty cycle, 3.3 v fin = 150 mhz 20 80 % output clock duty cycle, 3.3 v at vdd/2 45 49 to 51 55 % absolute clock period jitter, clk, note 3 deviation from mean 80 ps one-sigma clock period jitter, clk, note 3 50 ps phase noise, relative to carrier 1 khz offset -105 dbc/hz phase noise, relative to carrier 100 khz offset -115 dbc/hz parameter symbol conditions min. typ. max. units thermal resistance junction to ambient ja still air c/w ja 1 m/s air flow c/w ja 3 m/s air flow c/w thermal resistance junction to case jc c/w
ics571 low phase noise zero delay bu ffer zdb and multiplier/divider idt? / ics? low phase noise zero delay buffer 6 ics571 rev f 062306 package outline and package dimensions (8-pin soic, 150 mil. 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 a ccuracy and reliability, integrat ed circuit systems (ics) ass umes no responsibility for either its use or for the infringement of an y patents or other rights of third parties, which would result f rom its use. no other circuits, patents, or licenses are im plied. this product is intended for use in normal commercial applications. any other applications such as those requiring extended temperature range, high reliab ility, or other extraordinary environmental requirements are not recommended without additional processing by ics. ics reserves th e right to change any circuitr y or specifications without noti ce. ics does not authorize or warrant any ics product for use in life support devices or critical medical instruments. part / order number marking shipping packaging package temperature ics571m ics571m tubes 8-pin soic 0 to +70 c ics571mt tape and reel 8-pin soic 0 to +70 c ics571mlf 571mlf tubes 8-pin soic 0 to +70 c ICS571MLFT 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 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
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