datasheet vcxo and set-top clock source mk2771-15 idt? / ics? vcxo and set-top clock source 1 mk2771-15 rev f 032204 description the mk2771-15 is a low-cost, low-jitter, high-performance vcxo and clock synthesizer designed for set-top boxes. the on-chip voltage controlled crystal oscillator accepts a 0 to 3 v input voltage to cause the output clocks to vary by 100 ppm. using ics? patented vcxo and analog phase-locked loop (pll) techniques, the device uses an inexpensive 13.5 mhz pullable crystal input to produce multiple output clocks including two selectable processor clocks, a selectable audio clock, two communications clocks, and three fixed clocks. all clocks are frequency locked to the 27.00 mhz output (and to each other) with zero ppm error, so any output can be used as the vcxo output. features ? packaged in 28 pin ssop ? available in pb-free package ? ideal for systems using oak?s mpeg decoders ? on-chip patented vcxo with pull range of 200 ppm ? vcxo tuning voltage of 0 to 3 v ? processor frequencies include 33.3, 40, 50, 66.6, 81, and 100 mhz ? audio clocks of 8.192 mhz, 11.2896 mhz, 12.288 mhz and 18.432 mhz ? zero ppm synthesis error in all clocks (all exactly track 27 mhz vcxo) ? uses an inexpensive 13.5 mhz pullable crystal ? full cmos output swings with 25 ma output drive capability at ttl levels ? advanced, low-power, sub-micron cmos process ? 5 v operating voltage with 3.3 v capable i/o block diagram processor clocks voltage controlled crystal oscillator x1 x2 13.5 mhz pullable crystal 27.000 mhz audio clock clock synthesis circuitry 13.500 mhz 54.00 mhz comm. clocks vddio gnd vdd vin sc acs1:0 pcs2:0 2 2 divide by 2 divide by 2 2 3
mk2771-15 vcxo and set-top clock source vcxo and synthesizer idt? / ics? vcxo and set-top clock source 2 mk2771-15 rev f 032204 pin assignment processor clock select table (mhz) audio clock table comm clock table (mhz) 0 = connect directly to ground 1 = connect directly to vddio m = leave floating or unconnected 18 7 17 8 16 9 15 vddio 10 vdd 11 sc 12 vdd 13 gnd 14 pclk1 pcs2 gnd gnd pclk2 cclk2 dc pcs1 13.5m 22 21 20 19 aclk vdd 5 6 vdd vin cclk1 24 23 gnd 3 4 x1 vdd 27m 26 25 54m 1 2 pcs0 x2 acs0 28 27 acs1 pcs2 pcs1 pcs0 pclk1 pclk2 0 0 0 27.500 off 0 0 1 33.333 66.666 0 1 0 33.326 83.314 0 1 1 50.000 100.000 1 0 0 32.400 81.000 1 0 1 40.000 33.333 1 1 0 test test 1 1 1 test test acs1 acs0 aclk (mhz) 0 0 8.192 0 1 11.2896 1 0 12.288 1 1 18.432 sc cclk1 cclk2 0 18.432 24.576 m 11.0592 18.432 1 11.0592 24.576
mk2771-15 vcxo and set-top clock source vcxo and synthesizer idt? / ics? vcxo and set-top clock source 3 mk2771-15 rev f 032204 pin descriptions pin number pin name pin type pin description 1 pcs0 input processor clock select 0. selects pclks on pins 11 and 12. see table above. internal pull-up resistor. 2 x2 xo crystal connection. connect to a pullable 13.5 mhz crystal. 3 x1 xi crystal connection. connect to a pullable 13.5 mhz crystal. 4, 5, 8 vdd power connect to +5 v. 6 vin input voltage input to vcxo. zero to 3 v signal which controls the frequency of the vcxo. 7 vddio power connect to +3.3 v or +5 v. amplitude of inputs must, and outputs will, match this. 9 sc tri-level input communications clock select pin. biased to m level if floating 10, 18, 19, 24 gnd power connect to ground. 11 pclk1 output processor clock output number 1. determined by status of pcs2:0. 12 pclk2 output processor clock output number 2. determined by status of pcs2:0. 13 pcs1 input processor clock select 1. selects pclks on pins 11 and 12. see table above. internal pull-up resistor. 14 aclk output audio clock output. determined by status of acs1, acs0 per table above. 15 dc ? don?t connect anything to this pin. 16 13.5m output 13.50 mhz vcxo clock output. 17 cclk2 output communications clock output 2 determined by status of sc per table above. 20 pcs2 input processor clock select 2. selects pclks on pins 11 and 12. see table above. internal pull-up resistor. 21, 22 vdd power connect to +5 v. 23 cclk1 output communications clock output 1 determined by status of sc per table above. 25 27m output 27.00 mhz vcxo clock output. 26 54m output 54.00 mhz vcxo clock output. 27 acs0 input audio clock select 0. selects aclk on pin 14. see table above. internal pull-up resistor. 28 acs1 input audio clock select 1. selects aclk on pin 14. see table above. internal pull-up resistor.
mk2771-15 vcxo and set-top clock source vcxo and synthesizer idt? / ics? vcxo and set-top clock source 4 mk2771-15 rev f 032204 absolute maximum ratings stresses above the ratings listed below can cause permanent damage to the mk2771-15. 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. dc electrical characteristics unless stated otherwise, vdd = 5 v , ambient temperature 0 to +70 c item rating supply voltage, vdd (referenced to gnd) 7 v inputs and clock outputs (referenced to gnd) -0.5 v to vdd+0.5 v ambient operating temperature 0 to +70 c storage temperature -65 to +150 c junction temperature 125 c soldering temperature 260 c parameter symbol conditions min. typ. max. units operating voltage vdd 4.75 5.25 v operating voltage vddio all inputs/outputs 3.15 5.25 v input high voltage, x1 pin only v ih 3.5 2.5 v input low voltage, x1 pin only v il 2.5 1.5 v input high voltage, except sc and pcs2 v ih 2v input low voltage, except sc and pcs2 v il 0.8 v input high voltage, sc and pcs2 only v ih vddio-0.5 v input low voltage, sc and pcs2 only v il 0.5 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 = -8 ma vddio-0.4 v operating supply current idd + iddio (3.3 v) no load, note 1 46+27 ma short circuit current i os each output 100 ma input capacitance, except x1 c in except x1, x2 7 pf frequency synthesis error all clocks 0 ppm vin, vcxo control voltage 0 3 v
mk2771-15 vcxo and set-top clock source vcxo and synthesizer idt? / ics? vcxo and set-top clock source 5 mk2771-15 rev f 032204 ac electrical characteristics unless stated otherwise, vdd = 5 v , ambient temperature 0 to +70 c note 1: with pclk at 100 mhz. note 2: with a pullable crystal that conforms to ics? specifications. pullable crystal specifications frequency 13.500000 mhz correlation (load) capacitance 14 pf co/c1 240 max. esr 35 ? max. operating temperature 0 to 70c initial accuracy 20 ppm temperature plus aging stability 50 ppm parameter symbol conditions min. typ. max. units input frequency 13.500000 mhz output clock rise time t or 0.8 to 2.0 v, no load 1.5 ns output clock fall time t of 2.0 to 0.8 v, no load 1.5 ns output clock duty cycle t od at vddio/2 40 50 60 % maximum absolute jitter, short term t ja 300 ps vcxo pullability t ja note 2 -100 100 ppm
mk2771-15 vcxo and set-top clock source vcxo and synthesizer idt? / ics? vcxo and set-top clock source 6 mk2771-15 rev f 032204 package outline and package dimensions (28-pin ssop) package dimensions are kept current with jedec publication no. 95 ordering information note: ?lf? denotes pb (lead) free package. 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 mk2771-15r mk2771-15 tubes 28-pin ssop 0 to +70 c MK2771-15RTR mk2771-15 tape and reel 28-pin ssop 0 to +70 c mk2771-15rlf mk2771-15lf tubes 28-pin ssop 0 to +70 c mk2771-15rlftr mk2771-15lf tape and reel 28-pin ssop 0 to +70 c index area 1 2 28 d e1 e seating plane a1 a a2 e - c - b aaa c c l millimeters inches symbol min max min max a 1.35 1.75 0.053 0.069 a1 0.102 0.254 0.004 0.010 a2 -- 1.50 -- .059 b 0.203 0.305 0.008 0.012 c 0.191 0.254 0.007 0.010 d 9.804 10.008 0.386 0.394 e 5.791 6.198 0.228 0.244 e1 3.810 3.988 0.150 0.157 e .635 basic .025 basic l 0.406 1.270 0.016 0.050 0 8 0 8
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