datasheet spread spectrum clock generator ics7152 idt? / ics? spread spectrum clock generator 1 ics7152 rev j 051310 description the ics7152-01, -02, -11, and -12 are clock generators for emi (electro magnetic interference) reduction (see below for frequency ranges and multiplier ratios). spectral peaks can be attenuat ed by slightly modu lating the oscillation frequency. both down and center spread profiles are selectable. center spread maintains an average frequency equal to an unspread clock. down spread meets maximum frequency specs over the entire modualtion cycle. features ? operating voltage of 3.3 v 0.3 v ? packaged in 8-pin soic ? input frequency range of 16.6 to 134.0 mhz ? output frequency range of 16.6 to 134.0 mhz ? provides a spread spectrum clock output (0.5%, 1.5% center spread; -1.0%, -3.0% down spread) ? advanced, low-power cmos process ? industrial temperature range available ? pb (lead) free package, rohs compliant block diagram product lineup product input frequency range modulation type modulation enable pin ics7152m-01, ics7152mi-01 16.6 mhz to 67 mhz down spread ye s ics7152m-02, ics7152mi-02 40.0 mhz to 134.0 mhz ics7152m-11, ics7152mi-11 16.6 mhz to 67.0 mhz center spread ics7152m-12, ics7152mi-12 40.0 mhz to 134.0 mhz pll clock synthesis and spread spectrum circuitry sel freq ckout gnd vdd clock buffer/ crystal ocsillator xin xout external caps required with crystal for accurate tuning of the clock xens
ics7152 spread spectrum clock generator sscg idt? / ics? spread spectrum clock generator 2 ics7152 rev j 051310 pin assignment modulation enable setting table sel modulation rate setting table frequency setting table pin descriptions xens pin 8 spread spectrum 0on 1off xens xout gnd freq sel ckout vdd xin 1 2 3 4 8 7 6 5 8 pin (150 mil) soic sel pin 4 (note1) spread direction spread percentage (%) part number 0 center 0.5 ics7152m-11, ics7152m-12 down -1.0 ics7152m-01, ics7152m-02 1 center 1.5 ics7152m-11, ics7152m-12 down -3.0 ics7152m-01, ics7152m-02 freq pin 7 frequency 0 16.6 to 40 mhz ics7152m-01, ics7152m-11 40 to 80 mhz ics7152m-02, ics7152m-12 1 33 to 67 mhz ics7152m-01, ics7152m-11 66 to 134 mhz ics7152m-02, ics7152m-12 pin number pin name pin type pin description 1 xin input crystal resonator connection pin/clock input pin. 2 xout output crystal resonator connection pin. 3 gnd power connect to ground. 4 sel input modulation rate setting pin. 5 ckout output modulated clock output pin. 6 vdd power connect to +3.3 v. 7 freq input frequency setting pin. 8 xens input modulation enable setting pin.
ics7152 spread spectrum clock generator sscg idt? / ics? spread spectrum clock generator 3 ics7152 rev j 051310 external components the ics7152 requires a minimum number of external components for proper operation. decoupling capacitor a decoupling capacitor of 0.01f must be connected between gnd and vdd on pin 6, as close to this pin as possible. for optimum device performance, the decoupling capacitor should be mounted on the component side of the pcb. avoid the use of vias in the decoupling circuit. series termination resistor series termination should be used on the clock output. to series terminate a 50 ? trace (a commonly used trace impedance) place a 27 ? resistor in series with the clock line, as close to the clock output pin as possible. the nominal impedance of the clock output is 25 ? . pcb layout recommendations for optimum device performance and lowest output phase noise, the following guidelin es should be observed. 1) an optimum layout is one with all components on the same side of the board, minimizing vias through other signal layers. other signal traces should be routed away from the ics7152. this includes signal traces just underneath the device, or on layers adjacent to the ground plane layer used by the device. crystal information the crystal used should be a fundamental mode, parallel resonant. crystal capacitors should be connected from pins x1 to ground and x2 to ground to optimize the initial accuracy. the value of these capacitors is given by the following equation: crystal caps (pf) = (c l - 6) x 2 in the equation, c l is the crystal load capacitance. so, for a crystal with a 16 pf load capacitance, two 20 pf [(16-6) x 2] capacitors should be used. spread spectrum profile the ics7152 low emi clock generator uses a triangular frequency modulation profile for optimal down stream tracking of zero delay buffers and other pll devices. the frequency modulation amplitude is constant with variations of the input frequency. time frequency modulation rate
ics7152 spread spectrum clock generator sscg idt? / ics? spread spectrum clock generator 4 ics7152 rev j 051310 absolute maximum ratings stresses above the ratings listed below can cause perm anent damage to the ics7152. 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. overshoot/undershoot recommended operation conditions item rating supply voltage, vdd 7 v all inputs and outputs (referenced to gnd) -0.5 v to vdd+0.5 v ambient operating temperature -40 to +85 c storage temperature -55 to +125 c junction temperature -40 to +125 c soldering temperature 260 c overshoot (v iover ) vdd + 1.0 v (t over < 50 ns) max undershoot (v iunder ) gnd - 1.0 v (t under < 50 ns) min parameter min. typ. max. units ambient operating temperature -40 +85 c power supply voltage (measured in respect to gnd) +3.0 3.3 3.6 v input pin v iover < v dd + 1.0 v v iunder < gnd - 1.0 v t over < 50 ns t under < 50 ns v dd gnd
ics7152 spread spectrum clock generator sscg idt? / ics? spread spectrum clock generator 5 ics7152 rev j 051310 dc electrical characteristics unless stated otherwise, vdd = 3.3 v 0.3 v , ambient temperature -40 to +85 c parameter symbol conditions min. typ. max. units operating voltage vdd 3.0 3.3 3.6 v supply current idd no load, at 3.3 v 14 28 ma input high voltage v ih sel, freq, xens vdd x 0.8 vdd + 0.3 v xin, input slew rate 3 v/ns, 16.6 to 100 mhz vdd x 0.8 vdd + 0.3 v xin, input slew rate 3 v/ns, 100 to 134 mhz vdd x 0.9 vdd + 0.3 v input low voltage v il sel, freq, xens gnd vdd x 0.20 v xin, input slew rate 3 v/ns, 16.6 to 100 mhz gnd vdd x 0.20 v xin, input slew rate 3 v/ns, 100 to 134 mhz gnd vdd x 0.10 v output high voltage v oh ckout, i oh = -4 ma vdd - 0.5 vdd v output low voltage v ol ckout, i ol = 4 ma gnd 0.4 v input capacitance c in xin, sel, xens 16 pf load capacitance c l ckout, 16.6 to 67 mhz 15 pf ckout, 67 to 100 mhz 10 pf ckout, 100 to 134 mhz 7pf output impedance z o ckout, 16.6 to 134 mhz 25 ?
ics7152 spread spectrum clock generator sscg idt? / ics? spread spectrum clock generator 6 ics7152 rev j 051310 ac electrical characteristics unless stated otherwise, vdd = 3.3 v 0.3 v , ambient temperature -40 to +85 c parameter symbol conditions min. typ. max. units input crystal frequency 16.6 40 mhz input clock frequency f in ics7152-01, -11 16.6 67 mhz ics7152-02, -12 40 134 mhz output frequency f out ckout, ics7152-01, -11 16.6 67 mhz ckout, ics7152-02, -12 40 134 mhz input clock duty cycle t dci xin, 16.6 to 100 mhz 40 50 60 % xin, 100 to 134 mhz 45 50 55 % output clock duty cycle t dcc ckout, 1.5 v 40 60 % output slew rate ckout, 0.4 to 2.4 v, cl = 15 pf 0.5 3.0 v/ns cycle-to-cycle jitter t jc no load, spread off, ics7152-01, -02 150 ps no load, spread off, ics7152-11, -12 250 no load, spread off, ics7152-01, 33.33 mhz, sel = 0, freq = 1 120 power-up time pll lock-time from power-up to 1% of final value 25ms modulation frequency f mod ckout 33 khz
ics7152 spread spectrum clock generator sscg idt? / ics? spread spectrum clock generator 7 ics7152 rev j 051310 input frequency (f in = 1/t in ) output slew rate thermal characteristics 8 soic 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 xin t in 0.8 v dd ckout sr = (2.4 - 0.4) /t r , sr = (2.4 - 0.4) /t f t r 2.4 v t f 0.4 v
ics7152 spread spectrum clock generator sscg idt? / ics? spread spectrum clock generator 8 ics7152 rev j 051310 package outline and package dimensions (8-pin soic, 150 mil. body) package dimensions are kept current with jedec publication no. 95 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
ics7152 spread spectrum clock generator sscg idt? / ics? spread spectrum clock generator 9 ics7152 rev j 051310 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 both accuracy and reliability, integrated device technology (idt) a ssumes no responsibility for either its use or for the infringement of any paten ts or other rights of third parties, which would resul t from 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 idt. idt reserves th e right to change any circuitry or specifications without noti ce. 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 7152m-01lf 7152m01l tubes 8-pin soic 0 to +70 c 7152m-01lft 7152m01l tape and reel 8-pin soic 0 to +70 c 7152mi-01lf 7152i01l tubes 8-pin soic -40 to +85 c 7152mi-01lft 7152i01l tape and reel 8-pin soic -40 to +85 c 7152m-02lf 7152m02l tubes 8-pin soic 0 to +70 c 7152m-02lft 7152m02l tape and reel 8-pin soic 0 to +70 c 7152mi-02lf 7152i02l tubes 8-pin soic -40 to +85 c 7152mi-02lft 7152i02l tape and reel 8-pin soic -40 to +85 c 7152m-11lf 7152m11l tubes 8-pin soic 0 to +70 c 7152m-11lft 7152m11l tape and reel 8-pin soic 0 to +70 c 7152mi-11lf 7152i11l tubes 8-pin soic -40 to +85 c 7152mi-11lft 7152i11l tape and reel 8-pin soic -40 to +85 c 7152m-12lf 7152m12l tubes 8-pin soic 0 to +70 c 7152m-12lft 7152m12l tape and reel 8-pin soic 0 to +70 c 7152MI-12LF 7152i12l tubes 8-pin soic -40 to +85 c 7152MI-12LFt 7152i12l tape and reel 8-pin soic -40 to +85 c
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