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ds04-29115-2e fujitsu semiconductor data sheet spread spectrum clock generator mb88154 description mb88154 is a clock generator for emi (electro magnetic interference) reduction. th e peak of unnecessary radi- ation noise (emi) can be attenuated by making the oscilla tion frequency slightly modulate periodically with the internal modulator. it corresponds to both of the center spread which modulate s input frequency as middle centered and down spread which modulate s so as not to exceed input frequency. feature ? input frequency : 16.6 mhz to 67 mhz output frequency: 16.6 mhz to 67 mhz (one time input frequency) modulation rate can select from 0.5 % , 1.0 % , 1.5 % or ? 1.0 % , ? 2.0 % , ? 3.0 % . (for center spread / down spread.) equipped with crystal oscillation circuit: range of oscillation 16 .6 m mhz to 48 mhz the external clock can be input: 16.6 mhz to 67 mhz modulation clock output duty : 40 % to 60 % modulation clock cycle-cycle jitter : less than 100 ps low current consumption by cmos process : 5.0 ma (24 mhz : typ-sample, no load) power supply voltage : 3.3 v 0.3 v operating temperature : ? 40 c to + 85 c package : sop 8-pin pac k ag e 8-pin plastic sop (fpt-8p-m02)
mb88154 2 product lineup mb88154 has two kinds of input frequency, and two kinds of modulation type (center/down spread), total four line- ups. pin assignment pin description product input/output frequency modulation type mb88154-102 33 mhz to 67 mhz down mb88154-103 16.6 mhz to 40 mhz mb88154-112 33 mhz to 67 mhz center mb88154-113 16.6 mhz to 40 mhz pin name i/o pin no. description ckout o 1 modulated clock output pin v dd ? 2 power supply voltage pin v ss ? 3gnd pin xin i 4 crystal resonator connection pin/clock input pin xout o 5 crystal resonator connection pin sel0 i 6 modulation rate setting pin refout o 7 non-modulated clock output pin sel1 i 8 modulation rate setting pin 1 2 3 4 8 7 6 5 c kout v dd v ss xin sel1 refou t sel0 xout mb88154 top view fpt-8p-m02
mb88154 3 i/o circuit type note : for xin and xout pins, see ? oscillation circuit? pin circuit type remarks sel0 sel1 cmos hysteresis input ckout refout cmos output i ol = 3 ma
mb88154 4 handling devices preventing latchup a latchup can occur if, on this de vice, (a) a voltage higher than v dd or a voltage lower than v ss is applied to an input or output pin or (b) a voltage hi gher than the rating is applied between v dd and v ss . the latchup, if it occurs, significantly increases the power supply current and ma y cause thermal destruction of an element. when you use this device, be very careful not to exceed the maximum rating. handling unused pins do not leave an unused input pin open, since it ma y cause a malfunction. handle by, using a pull-up or pull-down resistor. unused output pin should be opened. the attention when the external clock is used input the clock to xin pin, and xout pin s hould be opened when you us e the external clock. please pay attention so that an ov ershoot and an undershoo t do not occur to an input clock of xin pin. power supply pins please design connecting the power s upply pin of this device by as low impedance as possible from the current supply source. we recommend connecting electr olytic capacitor (about 10 f) and the ceramic capacitor (about 0.01 f) in parallel between v ss and v dd near the device, as a bypass capacitor. oscillation circuit noise near the xin and xout pins may cause the device to malfunction. design printed circuit boards so that electric wiring of xin or xout pin and th e resonator do not intersect other wiring. design the printed circuit board that surro unds the xin and xout pins with ground.
mb88154 5 block diagram v dd v ss ckout sel1 refou t r f = 1 m ? xout xin sel0 1 ? m 1 ? n 1 ? l idac ico modulation rate setting reference clock pll block clock output reference clock output phase compare v/i conversion loop filter reference clock modulation logic modulation clock output modulation rate setting modulation enable setting mb88154 pll block charge pump a glitchless idac (current output d/a converter) pr ovides precise modulation, thereby dramatically reducing emi.
mb88154 6 pin setting sel 0, sel 1 modulation rate setting notes : ? the modulation rate can be changed at the level of the pin. spectrum does not spread when ?h? level is set to sel0 and sel1 pin. the cl ock with low jitter can be obtained. ? when changing the modulation rate setting, the stabilization wait time for the modulation clock is required. the stabilization wait time for the m odulation clock take the maximum value of ? electrical characteristics ? ac characteristics lock-up time?. ? center spread spectrum is spread (modulated) by centering on the input frequency. ? down spread spectrum is spread (modulated) below the input frequency. sel1 sel0 modulation rate mb88154-102 , mb88154-103 mb88154-112 , mb88154-113 down spread center spread ll ? 1.0 % 0.5 % lh ? 2.0 % 1.0 % hl ? 3.0 % 1.5 % h h no spread no spread ? 1.5% + 1.5% radiation level input frequency frequency modulation width 3.0 % modulation rate center spread example of 1.5 % ? 3.0% radiation level frequency modulation width down spread example of ? 3.0 % modulation width 3.0 % frequency in modulation off
mb88154 7 absolute maximum ratings * : the parameter is based on v ss = 0.0 v. warning: semiconductor devices can be permanently dam aged by application of stress (voltage, current, temperature, etc.) in excess of absolute maximum ratings. do not exceed these ratings. parameter symbol rating unit min max power supply voltage* v dd ? 0.5 + 4.0 v input voltage* v i v ss ? 0.5 v dd + 0.5 v output voltage* v o v ss ? 0.5 v dd + 0.5 v storage temperature t st ? 55 + 125 c operation junction temperature t j ? 40 + 125 c output current i o ? 14 + 14 ma overshoot v iover ? v dd + 1.0 (t over 50 ns) v undershoot v iunder v ss ? 1.0 (t under 50 ns) ? v v d d v s s i nput pin overshoot/undershoot t under 50 ns t over 50 ns v iover v dd + 1.0 v v iunder v ss ? 1.0 v
mb88154 8 recommended operating conditions (v ss = 0.0 v) warning: the recommended operating conditions are require d in order to ensure the normal operation of the semiconductor device. all of the device?s electric al characteristics are warranted when the device is operated within these ranges. always use semiconductor devices within their recommended operating cond ition ranges. operation outside these ranges may adversely affect re liability and could result in device failure. no warranty is made with respect to uses, operat ing conditions, or combinations not represented on the data sheet. users considering application outside the listed conditions are advised to contact their fujitsu representatives beforehand. parameter symbol pin conditions value unit min typ max power supply voltage v dd v dd ? 3.0 3.3 3.6 v ?h? level input voltage v ih xin, sel0, sel1 ? v dd 0.80 ? v dd + 0.3 v ?l? level input voltage v il ? v ss ? v dd 0.20 v input clock duty cycle t dci xin 16.6 mhz to 67 mhz 40 50 60 % operating temperature ta ?? ? 40 ? + 85 c x in t a t b 1.5 v input clock duty cycle (t dci = t b /t a )
mb88154 9 electrical characteristics dc characteristics (ta = ? 40 c to + 85 c, v dd = 3.3 v 0.3 v, v ss = 0.0 v) ac characteristics (ta = ? 40 c to + 85 c, v dd = 3.3 v 0.3 v, v ss = 0.0 v) * : duty of the refout output is guaranteed only for the followi ng a and b because it depends on t dci of input clock duty. a. resonator : when resonator is connected wi th xin and xout and oscillates normally. b. external clock input : the input level is full - swing (v ss ? v dd ). parameter symbol pin conditions value unit min typ max power supply current i cc v dd no load capacitance at 24 mhz output ? 5.0 7.0 ma output voltage v oh ckout, refout ?h? level output i oh = ? 3 ma v dd ? 0.5 ? v dd v v ol ?l? level output i ol = 3 ma v ss ? 0.4 v output impedance z o ckout, refout 16.6 mhz to 67 mhz ? 70 ?? input capacitance c in xin, sel0, sel1 ta = + 25 c, v dd = v i = 0.0 v, f = 1 mhz ?? 16 pf parameter symbol pin conditions value unit min typ max oscillation frequency f x xin, xout fundamental oscillation 16.6 ? 40 mhz 3rd over-tone oscillation 40 ? 48 input frequency f in xin mb88154-103/113 16.6 ? 40 mhz mb88154-102/112 33 ? 67 output frequency f out ckout, refout mb88154-103/113 16.6 ? 40 mhz mb88154-102/112 33 ? 67 output slew rate sr ckout, refout 0.4 v to 2.4 v load capacitance 15 pf 0.3 ? 2.0 v/ns output clock duty cycle t dcc ckout 1.5 v 40 ? 60 % t dcr refout 1.5 v t dci ? 10* ? t dci + 10* % modulation frequency f mod ckout ?? 12.5 ? khz lock-up time t lk ckout ?? 25ms cycle-cycle jitter t jc ckout no load capacitance, ta = + 25 c, v dd = 3.3 v, standard deviation ?? 100 ps
mb88154 10 output clock duty cycle (t dcc , t dcr = t b /t a ) input frequency (f in = 1/t in ) output slew rate (sr) cycle-cycle jitter (t jc = | t n ? t n + 1 |) c kout, r efout 1.5 v t a t b 0.8 v dd t in x in 2.4 v 0.4 v t f t r c kout, r efout note : sr = (2.4 ? 0.4) /t r , sr = (2.4 ? 0.4) /t f t n+1 t n ckout note : cycle-cycle jitter is defined the differen ce between a certain cycle and immediately after (or, immediately before) .
mb88154 11 modulation waveform f mod = 12.5 khz (typ) ? 1.5 % + 1.5 % f mod = 12.5 khz (typ) ? 1.0 % ? 0.5 % ? 1.5 % modulation rate, example of center spread ? ? 1.0 % modulation rate, example of down spread ckout output frequency ckout output frequency frequency at modulation off frequency at modulation off time time
mb88154 12 lock-up time if the setting pin is fixed at the ?h? or ?l? level, the maximum time after the power is turned on until the set clock signal is output from ckout pin is (the stabiliz ation wait time of input clock to xin pin) + (the lock-up time ?t lk ?). for the input clock stabilization time, check the c haracteristics of the resonator or oscillator used. note : when the pin setting is changed, the ckout pin output clock stabilization time is required. until the output clock signal becomes stable, the output frequency, out put clock duty cycle, modulation period, and cycle- cycle jitter cannot be guaranteed. it is therefore advi sable to perform processing such as cancelling a reset of the device at the succeeding stage after the lock-up time. 3.0 v v dd xin sel0, sel1 v ih ckout internal clock stabilization wait time t lk (lock-up time ) setting pin
mb88154 13 oscillation circuit the left side of figures below shows the connection ex ample about general resonator . the oscillation circuit has the built-in feedback resistance (1 m ? ) . the value of capacity (c 1 and c 2 ) is required adjusting to the most suitable value of an individual resonator. the right side of figures below shows the example of connecting for the 3rd over-tone resonator. the value of capacity (c 1 , c 2 and c 3 ) and inductance (l 1 ) is needed adjusting to the most suitable value of an individual resonator. the most suitable value is different by indivi dual resonator. please refer to the resonator manufacturer which use for the most suitable value. when an external clock is used (the resonator is not used) , input the clock to xin pin and do not co nnect anything with xout. c 1 r f (1 m ? ) c 2 c 1 r f (1 m ? ) c 2 c 3 l 1 xin pin xout pin internal lsi external lsi xin pin xout pin normal resonator 3rd over-tone resonator ? when using a resonator ? when using an external clock open r f (1 m ? ) note : note that a jitter characteristic of an i nput clock may cause an affect a cycle-cycle jitter characteristic. lsi internal lsi external xout pin xin pin external clock
mb88154 14 interconnection circuit example 1 2 3 4 8 7 6 5 mb88154 sel0 sel1 c 1 c 2 r 1 r 2 ens c 3 + c 4 xtal c 1 , c 2 : oscillation stabilization capacitance (see ? oscillation circuit?.) c 3 : capacitor of 10 f or higher c 4 : capacitor about 0.01 f (connect a capacitor of good high frequency property (ex. laminated ceramic capacito r) to close to this device.) r 1 , r 2 : impedance matching resistor for board pattern
mb88154 15 example characteristics the condition of the examples of the charac teristic is shown as follows: input frequency = 20 mhz (output frequency = 20 mhz : using mb88154-113 ), power - supply voltage = 3.3 v, none load capacity. modulation rate = 1.5 % (center spread) spectrum analyzer hp4396b is connected with ckou t. the result of the measurement with rbw = 1 khz (att use for ? 6db). ch b spectrum 10 db /ref 0 dbm a vg 4 rbw# 1 kh z vbw 1 kh z att 6 db center 20 mh z swp 2.505 s span 4 mh z no modulation ? 6.18 dbm modulation 1.5 % ? 26.03 dbm
mb88154 16 ordering information part number input/output frequency modulation type package remarks mb88154pnf-g-102-jne1 mb88154pnf-g-103-jne1 mb88154pnf-g-112-jne1 mb88154pnf-g-113-jne1 33 mhz to 67 mhz 16.6 mhz to 40 mhz 33 mhz to 67 mhz 16.6 mhz to 40 mhz down down center center 8-pin plastic sop (fpt-8p-m02) mb88154pnf-g-102-jn-efe1 mb88154pnf-g-103-jn-efe1 mb88154pnf-g-112-jn-efe1 MB88154PNF-G-113-JN-EFE1 33 mhz to 67 mhz 16.6 mhz to 40 mhz 33 mhz to 67 mhz 16.6 mhz to 40 mhz down down center center 8-pin plastic sop (fpt-8p-m02) emboss taping (ef type) mb88154pnf-g-102-jn-ere1 mb88154pnf-g-103-jn-ere1 mb88154pnf-g-112-jn-ere1 mb88154pnf-g-113-jn-ere1 33 mhz to 67 mhz 16.6 mhz to 40 mhz 33 mhz to 67 mhz 16.6 mhz to 40 mhz down down center center 8-pin plastic sop (fpt-8p-m02) emboss taping (er type)
mb88154 17 package dimension 8-pin plastic sop (fpt-8p-m02) note 1) *1 : these dimensions include resin protrusion. note 2) *2 : these dimensions do not include resin protrusion. note 3) pins width and pins thickness include plating thickness. note 4) pins width do not include tie bar cutting remainder. dimensions in mm (inches) note : the values in parent heses are reference values. c 2002 fujitsu limited f08004s-c-4-7 1.27(.050) 3.900.30 6.000.40 .199 ?.008 +.010 ?0.20 +0.25 5.05 0.13(.005) m (.154.012) (.236.016) 0.10(.004) 14 5 8 0.440.08 (.017.003) ?0.07 +0.03 0.22 .009 +.001 ?.003 45 ? 0.40(.016) "a" 0~8 ? 0.25(.010) (mounting height) details of "a" part 1.550.20 (.061.008) 0.500.20 (.020.008) 0.600.15 (.024.006) 0.150.10 (.006.004) (stand off) 0.10(.004) * 1 * 2
mb88154 fujitsu limited all rights reserved. the contents of this document are subject to change without notice. customers are advised to consult with fujitsu sales representatives before ordering. the information, such as descriptions of function and application circuit examples, in this document are presented solely for the purpose of reference to show examples of operations and uses of fujitsu semiconductor device; fujitsu does not warrant proper operation of the device with respect to use based on such information. when you develop equipment incorporating the device based on such information, you must assume any responsibility arising out of such use of the information. fujitsu assumes no liability for any damages whatsoever arising out of the use of the information. any information in this document, including descriptions of function and schematic diagrams, shall not be construed as license of the use or exercise of any intellectual property right, such as patent right or copyright, or any ot her right of fujitsu or any third party or does fujitsu warrant non-in fringement of any third-party?s intellectual property right or othe r right by using such information. fujitsu assumes no liability for any infringement of the intellectual property rights or other rights of third parties which would result from the use of information contained herein. the products described in this document are designed, developed and manufactured as contemplated for general use, including without limitation, ordinary industrial use, general office use, personal use, and household use, but are not designed, developed and manufactured as contemplated (1) for use accompanying fatal risks or dangers that, unless extremel y high safety is secured, could have a serious effect to the public, and could lead directly to death, personal injury, severe physical damage or other loss (i.e., nuclear reaction control in nuclear facility, ai rcraft flight control, air traffic control, mass transport control, medical life support system, missile launch control in weapon syst em), or (2) for use requiring extremely high reliability (i.e., su bmersible repeater and artificial satellite). please note that fujitsu will not be liable against you and/or any third party for any claims or damages arising in connection with above-mentioned uses of the products. any semiconductor devices have an inherent chance of failure. you must protect against injury, damage or loss from such failures by incorporating safety design m easures into your facility and equipment such as redundancy, fi re protection, and prevention of over-current levels and other abnormal operating conditions. if any products described in this document represent goods or technologies subject to certain restrictions on export under the foreign exchange and foreign trade law of japan, the prior authorization by japanese government will be required for export of those products from japan. f0502 ? 2005 fujitsu limited printed in japan

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