datasheet oscar? user config urable pecl clock ics525-04 idt? / ics? oscar? user configurable pecl clock 1 ics525-04 rev c 060606 description the ics525-04 oscar tm is the most flexible way to generate a high quality, high frequency differential pecl clock output from a crystal or cmos clock input. the name oscar tm stands for oscillator replacement, as it is designed to replace crystal oscillators in almost any electronic system. users can easily configure the device to produce nearly any output frequency from any input frequency by grounding or floating the select pins. neither microcontroller, software, nor device programmer are needed to set the frequency. using phase locked loop techniques, the device accepts a crystal or clock to produce output clocks up to 156 mhz at 3.3v, keeping them frequency locked together. for simple multipliers to produce common frequencies, refer to the loco tm family of parts, which are smaller and more cost effective. this product is intended for clock generation. it has low output jitter (variation in the output period), but input to output skew and jitter are not defined nor guaranteed. for applications which require defin ed input to output timing, use the ics527-02. features ? packaged as 28 pin ssop (150 mil body) ? highly accurate frequency generation ? user determines the output frequency by setting all internal dividers ? eliminates need for custom oscillators ? no software needed ? pull-ups on select inputs ? input crystal frequency of 5 - 27 mhz ? input clock frequency of 2 - 50 mhz ? output clock frequencies up to 156 mhz at 3.3v ? output clock frequencies up to 200 mhz at 5v ? very low jitter ? pecl levels set by external resistors ? operating voltage of 3.3v or 5v ? ideal for oscillator replacement ? industrial temperature version available ? advanced, low power cmos process block diagram vdd gnd 2 2 pecl pecl reference divider phase comparator, charge pump, and loop filter vco vco divider output divider 9 73 r6:r0 v8:v0 s2:s0 res vdd vdd gnd gnd vdd x1/iclk x2 crystal or clock input optional crystal capacitors crystal oscillator 560 ? 82 ? 820 ? 82 ? 820 ?
ics525-04 oscar? user configurable pecl clock pecl multiplier idt? / ics? oscar? user configurable pecl clock 2 ics525-04 rev c 060606 pin assignment maximum output frequency and output divider table 18 7 17 8 16 9 15 x1/iclk 10 x2 11 gnd 12 pecl 13 v0 14 v1 gnd res v8 v2 v7 v5 v3 v6 22 21 20 19 v4 pecl 5 6 s2 vdd vdd 24 23 r0 3 4 s0 s1 r1 26 25 r2 1 2 r5 r6 r3 28 27 r4 28 pin 150 mil body ssop s2 pin 5 s1 pin 4 s0 pin 3 clk output divider max output fr equency (mhz) vdd = 5v vdd = 3.3v 0 - 70 c -40 - 85 c 0 - 70 c -40 - 85 c 0 0 0 6 45 44 27 26 0 0 1 2 120 117 81 77 0 1 0 8 34 33 20 19 0 1 1 4 68 66 40 38 1 0 0 5 54 53 32 31 1 0 1 7 39 38 23 22 1 1 0 1 200 195 162 154 1 1 1 3 90 89 54 51
ics525-04 oscar? user configurable pecl clock pecl multiplier idt? / ics? oscar? user configurable pecl clock 3 ics525-04 rev c 060606 pin descriptions pin number pin name pin type pin description 1 r5 input reference divider word input pins dete rmined by user. forms a binary number from 0 to 127. internal pull-up. 2 r6 input reference divider word input pins dete rmined by user. forms a binary number from 0 to 127. internal pull-up. 3 s0 input select pins for output divider determined by user. see table above. internal pull-up. 4 s1 input select pins for output divider determined by user. see table above. internal pull-up. 5 s2 input select pins for output divider determined by user. see table above. internal pull-up. 6 vdd power connect to vdd. 7 x1/iclk input crystal connection. connect to a parallel resonant crystal or input clock. 8 x2 input crystal connection. connect to a crystal or leave unconnected for clock. 9 gnd power connect to ground. 10 - 18 v0 - v8 input vco divider word input pins determined by user. forms a binary number from 0 to 511. internal pull-up. 19 res input bias resistor input. connect a resistor between this pin and vdd. 20 gnd power connect to ground. 21 pecl output complementary pecl output. connect resistor load to this pin. 22 pecl output pecl output. connect resistor load to this pin. 23 vdd power connect to vdd. 24 r0 input reference divider word input pins dete rmined by user. forms a binary number from 0 to 127. internal pull-up. 25 r1 input reference divider word input pins dete rmined by user. forms a binary number from 0 to 127. internal pull-up. 26 r2 input reference divider word input pins dete rmined by user. forms a binary number from 0 to 127. internal pull-up. 27 r3 input reference divider word input pins dete rmined by user. forms a binary number from 0 to 127. internal pull-up. 28 r4 input reference divider word input pins dete rmined by user. forms a binary number from 0 to 127. internal pull-up.
ics525-04 oscar? user configurable pecl clock pecl multiplier idt? / ics? oscar? user configurable pecl clock 4 ics525-04 rev c 060606 external components decoupling capacitors as with any high performance mixed-signal ic, the ics525-04 must be isolated from system power supply noise to perform optimally. decoupling capacitors of 0.01f must be connected between each vdd and the gnd, one on each side of the chip.the capacitor must be connected close to the device to minimize lead inductance. no ex ternal power supply filtering is required for this device. external resistors a 560 ? resistor must be connected between res (pin 19) and vdd. a total of four resistors are needed for the pecl outputs as shown on the block diagram on page 1. the value of these resistors are shown, but can be varied to change the differential pair output swing and the common mode voltage. consult application note man09 for more information. crystal load capacitors the total on-chip capacitance for a crystal is approximately 16 pf, so a parallel resonant, fundamental mode crystal with this value of load (correlation) capacitance should be used. for crystals with a specified load capacitance greater than 16 pf, crystal capacitors may be connected from each of the pins x1 and x2 to ground as shown in the block diagram. the value (in pf) of these crystal caps should be (cl - 16)*2, where cl is the crystal load capacitance. these external capacitors are only required for applications where the exact frequency is critical. for a clock input, connect to x1 and leave x2 unconnected (no capacitors on either). determining the output frequency users have full control in setting the desired output frequency over the range shown in the table on page 2. to replace a standard oscillator, users should connect the divider select input pins directly to ground (or vdd, although this is not required because of internal pull-ups) during printed circuit board la yout. the ics525-04 will automatically produce the correct clock when all components are soldered. it is also possible to connect the inputs to parallel i/o ports to switch frequencies. by choosing divides carefully, the number of inputs which need to be changed can be minimized. observe the restrictions on allowed values of vdw and rdw. the output of the ics525-04 can be determined by the following simple equation: where: reference divider word (rdw) = 0 to 127 vco divider word (vdw) = 0 to 511 output divider (od) = values on page 2 also, the following operating ranges should be observed: see table on page 2 for full details of maximum output. the dividers are expressed as integers. for example, if a 66.66 mhz output on clk1 is desired from a 14.31818 mhz input, the vco divider word (vdw) should be 276, with an output divide (od) of 2. in this example, r6:r0 is 0111011, v8:v0 is 100010100 and s2:s0 is 001. since all of these inputs have pull-up resistors, it is only necessary to ground the zero pins, namely v7, v6, v5, v3, v1, v0, r6, r2, s2, and s1. to determine the best combination of vco, reference, and output divide, use the ics525 calculator on our web site: www.icst.com. the online form is easy to use and quickly shows you up to three options for these settings. pecl frequency input frequency vdw 8 + rdw 2 + () od ? -------------------------------------------- - = 10m input frequency x vdw 8 + rdw 2 + () ----------------------------- 2 0 0 m 5 v () or162m 3.3v ) () << 200khz inputfrequency rdw 2 + () ----------------------------------------------- <
ics525-04 oscar? user configurable pecl clock pecl multiplier idt? / ics? oscar? user configurable pecl clock 5 ics525-04 rev c 060606 absolute maximum ratings stresses above the ratings listed below can cause permanent damage to the ics525-04. these ratings, which are standard values for ics commercially rated parts, are stre ss ratings only. functional operation of the device at these or any other conditions above those indicated in the op erational sections of the specifications is not implied. exposure to absolute maximum rating conditions for ext ended periods can affect prod uct reliability. electrical parameters are guaranteed only over the recommended operating temperature range. recommended operation conditions dc electrical characteristics unless stated otherwise, vdd = 3.3v 10%, ambient temperature 0 to +70 c item rating supply voltage, vdd 7v all inputs and outputs -0.5v to vdd+0.5v ambient operating temperature -40 to +85 c storage temperature -65 to +150 c junction temperature 175 c soldering temperature 260 c parameter min. typ. max. units ambient operating temperature, ics525r-04 0 +70 c ambient operating temperature, ICS525R-04I -40 +85 c power supply voltage (measured in respect to gnd) +3.0 +5.5 v parameter symbol conditions min. typ. max. units operating voltage vdd 3.0 5.5 v supply current idd 15 mhz in, 60mhz out, no load 34 ma 15mhz in, 60mhz out, vdd = 5v 60 ma input high voltage v ih 2v input low voltage v il 0.8 v input high voltage v ih x1/iclk only vdd/2+1 vdd/2 v input low voltage v il x1/iclk only vdd/2 vdd/2-1 v output high voltage v oh i oh = -12 ma 2.4 v output low voltage v ol i ol = 12 ma 0.4 v input capacitance c in v, r, s select pins 5 pf on-chip pull-up resistor r pu v, r, s select pins 270 k ?
ics525-04 oscar? user configurable pecl clock pecl multiplier idt? / ics? oscar? user configurable pecl clock 6 ics525-04 rev c 060606 ac electrical characteristics unless stated otherwise, vdd = 3.3v 5%, ambient temperature -40 to +85 c parameter symbol conditions min. typ. max. units input frequency f in crystal input 5 27 mhz clock input 2 50 mhz output frequency with od=2, vdd=4.5 to 5 f out 0 to +70 c1120mhz -40 to +85 c1117mhz output frequency with od=2, vdd=3.0 to 3.3 f out 0 to +70 c181mhz -40 to +85 c177mhz absolute clock period jitter t ja deviation from mean 50 ps one sigma clock period jitter t js 20 ps
ics525-04 oscar? user configurable pecl clock pecl multiplier idt? / ics? oscar? user configurable pecl clock 7 ics525-04 rev c 060606 package outline and package dimensions (28 pin ssop, 150 mil body, 0.025 mm pitch) package dimensions are kept current with jedec publication no. 95 , mo-153 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 circuit systems (ics) ass umes no responsibility for either its use or for the infringement of any patents or other rights of third parties, which would result f rom 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 extended temperature range, high reli ability, or other extraordinary en vironmental requirements are not recommended without additional processing by ics. ics reserves the right to change any circuitry 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 ics525r-04 ics525r-04 tubes 28-pin ssop 0 to +70 c ics525r-04t ics525r-04 tape and reel 28-pin ssop 0 to +70 c ICS525R-04I ICS525R-04I tubes 28-pin ssop -40 to +85 c ICS525R-04It ICS525R-04I tape and reel 28-pin ssop -40 to +85 c ics525r-04lf ics525r-04lf tubes 28-pin ssop 0 to +70 c ics525r-04lft ics525r-04lf tape and reel 28-pin ssop 0 to +70 c ICS525R-04Ilf ICS525R-04Ilf tubes 28-pin ssop -40 to +85 c ICS525R-04Ilft ICS525R-04Ilf tape and reel 28-pin ssop -40 to +85 c index area 1 2 28 d e1 e seating plane a 1 a a 2 e - c - b aaa c c l millimeters inches symbol min max min max a 1.351.75.053.069 a1 0.10 0.25 .0040 .010 a2 -- 1.50 -- .059 b 0.200.30.008.012 c 0.180.25.007.010 d 9.80 10.00 .386 .394 e 5.806.20.228.244 e1 3.80 4.00 .150 .157 e 0.635 basic 0.025 basic l 0.401.27.016.050 0 8 0 8 aaa -- 0.10 -- 0.004
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