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november 2006 asm3p2872a rev 1.7 notice: the information in this document is subject to change without notice. pulsecore semiconductor corporation 1715 s. bascom ave suite 200, campbell, ca 95008 ? tel: 408-879-9077 ? fax: 408-879-9018 www. p ulsecoresemi.com low power peak emi reducing solution features ? generates an emi optimiz ed clock signal at the output ? integrated loop filter components ? operates with a 3.3v / 2.5v supply ? operating current less than 6ma ? low power cmos design ? input frequency range: 13mhz to 30mhz for 2.5v : 13mhz to 30mhz for 3.3v ? generates a 1x low emi spread spectrum clock of the input frequency ? frequency deviation: -1.25% @ 22mhz ? available in 6-pin tsot-23, 8-pin soic and 8-pin tssop packages. product description the asm3p2872a is a versatile spread spectrum frequency modulator designed specifically for a wide range of clock frequencies. the asm3p2872a reduces electromagnetic interference (emi) at the clock source, allowing system wide reduction of emi of all clock dependent signals. the asm3p2872a allows significant system cost savings by reducing the number of circuit board layers ferrite beads, shielding that are traditionally required to pass emi regulations. the asm3p2872a uses the most efficient and optimized modulation profile approved by the fcc and is implemented by using a proprietary all digital method. the asm3p2872a modulates the output of a single pll in order to ?spread? the bandwidth of a synthesized clock, and more importantly, decreases the peak amplitudes of its harmonics. this results in significantly lower system emi compared to the typical narrow band signal produced by oscillators and most frequency generators. lowering emi by increasing a signal?s bandwidth is called ?spread spectrum clock generation?. applications the asm3p2872a is targeted towards all portable devices with very low power requirements like mp3 players, notebooks and digital still cameras. key specifications description specification supply voltages vdd = 3.3v /2.5v cycle-to-cycle jitter 200ps (max) output duty cycle 45/55% (worst case) modulation rate equation f in /640 frequency deviation -1.25% @ 22mhz block diagram vss modout vdd xin frequency divide r feedback divide r modulation phase detecto r loop filte r vco output divide r pll crystal oscillator xout refout
november 2006 asm3p2872a rev 1.7 low power peak emi reducing solution 2 of 12 notice: the information in this document is subject to change without notice. xout 1 2 3 4 5 6 asm3p2872a refout xin/clkin vdd modout vss pin configuration (6-pin tsot-23 package) pin description pin# pin name type description 1 refout o buffered output of the input frequency. 2 xout o crystal connection. if using an external reference, this pin must be left unconnected. 3 xin/clkin i crystal connection or external reference frequency input. this pin has dual functions. it can be connected either to an external crystal or an external reference clock. 4 vdd p power supply for the entire chip 5 modout o spread spectrum clock output. 6 vss p ground connection.
november 2006 asm3p2872a rev 1.7 low power peak emi reducing solution 3 of 12 notice: the information in this document is subject to change without notice. xin/clkin vss modout nc xout 1 2 3 4 5 6 7 8 asm3p2872a refout nc vdd pin configuration (8-pin soic and tssop packages) pin description pin# pin name type description 1 xin/clkin i crystal connection or external reference frequency input. this pin has dual functions. it can be connected either to an external crystal or an external reference clock. 2 xout o crystal connection. if using an external reference, this pin must be left unconnected. 3 refout o buffered output of the input frequency. 4 nc - no connect. 5 vss p ground connection. 6 modout o spread spectrum clock output. 7 nc - no connect. 8 vdd p power supply for the entire chip modulation profile specifications description specification for 2.5v supply 13mhz < clkin < 30mhz frequency range for 3.3v supply 13mhz < clkin < 30mhz modulation equation f in /640 frequency deviation -1.25% @ 22mhz
november 2006 asm3p2872a rev 1.7 low power peak emi reducing solution 4 of 12 notice: the information in this document is subject to change without notice. absolute maximum ratings symbol parameter rating unit vdd, v in voltage on any pin with respect to ground -0.5 to +4.6 v t stg storage temperature -65 to +125 c t a operating temperature -40 to +85 c t s max. soldering temperature (10 sec) 260 c t j junction temperature 150 c t dv static discharge voltage (as per jedec std22- a114-b) 2 kv note: these are stress ratings only and are not implied for functional use. exposure to absolute maximum ratings for prolonged periods of time may affect device reliability. dc electrical characteristics for 2.5v supply (test condition: all parameters are measured at ro om temperature (+25c) unless otherwise stated) symbol parameter min typ max unit v il input low voltage vss - 0.3 - 0.8 v v ih input high voltage 2.0 - vdd + 0.3 v i il input low current - - -35 a i ih input high current - - 35 a i xol xout output low current (@0.5v, vdd=2.5v) - 3 - ma i xoh xout output high current (@1.8v, vdd=2.5v) - 3 - ma v ol output low voltage (vdd = 2.5 v, i ol = 8 ma) - - 0.6 v v oh output high voltage (vdd = 2.5 v, i oh = 8 ma) 1.8 - - v i dd static supply current * - 1.1 - ma i cc dynamic supply current (2.5v, 30mhz and with no load) - 4.0 - ma vdd operating volt age 2.375 2.5 2.625 v t on power-up time (first locked cycle after power-up) - - 5 ms z out output impedance - 50 - ? * xin/clkin pin is pulled low ac electrical characteristics for 2.5v supply symbol parameter min typ max unit clkin input frequency 13 - 30 mhz modout output frequency 13 - 30 mhz input frequency = 13mhz - -1.85 - f d frequency deviation input frequency = 30mhz - -0.9 - % t lh * output rise time (measured from 0.7v to 1.7v) 0.7 1.5 1.7 ns t hl * output fall time (measured from 1.7v to 0.7v) 0.5 0.9 1.1 ns t jc jitter (cycle to cycle) - - 200 ps t d output duty cycle 45 50 55 % * t lh and t hl are measured into a capacitive load of 15pf
november 2006 asm3p2872a rev 1.7 low power peak emi reducing solution 5 of 12 notice: the information in this document is subject to change without notice. dc electrical characteristics for 3.3v supply (test condition: all parameters are measured at room temperature (+ 25c) unless otherwise stated) symbol parameter min typ max unit v il input low voltage vss - 0.3 - 0.8 v v ih input high voltage 2.0 - vdd + 0.3 v i il input low current - - -35 a i ih input high current - - 35 a i xol xout output low current (@0.4v, vdd=3.3v) - 3 - ma i xoh xout output high current (@2.5v, vdd=3.3v) - 3 - ma v ol output low voltage (vdd = 3.3 v, i ol = 8 ma) - - 0.4 v v oh output high voltage (vdd = 3.3 v, i oh = 8 ma) 2.5 - - v i dd static supply current* - 1.2 - ma i cc dynamic supply current (3.3v, 30mhz and with no load) - 5.5 - ma vdd operating volt age 2.7 3.3 3.6 v t on power-up time (first locked cycle after power-up)** - - 5 ms z out output impedance - 45 - ? * xin/clkin pin is pulled low ac electrical characteristics for 3.3v supply symbol parameter min typ max unit clkin input frequency 13 - 30 mhz modout output frequency 13 - 30 mhz input frequency = 13mhz - -1.85 - f d frequency deviation input frequency = 30mhz - -0.9 - % t lh * output rise time (measured from 0.8 to 2.0v) 0.5 1.4 1.7 ns t hl * output fall time (measured at 2.0v to 0.8v) 0.4 0.9 1.1 ns t jc jitter (cycle to cycle) - - 200 ps t d output duty cycle 45 50 55 % *t lh and t hl are measured into a capacitive load of 15pf
november 2006 asm3p2872a rev 1.7 low power peak emi reducing solution 6 of 12 notice: the information in this document is subject to change without notice. typical crystal oscillator circuit typical crystal specifications fundamental at cut parallel resonant crystal nominal frequency 14.31818mhz frequency tolerance 50 ppm or better at 25c operating temperature range -25c to +85c storage temperature -40c to +85c load capacitance 18pf shunt capacitance 7pf maximum esr 25 ? r1 = 510 ? c1 = 27 pf c2 = 27 pf crystal
november 2006 asm3p2872a rev 1.7 low power peak emi reducing solution 7 of 12 notice: the information in this document is subject to change without notice. package information 6-pin tsot-23 package dimensions inches millimeters symbol min max min max a 0.04 1.00 a1 0.00 0.004 0.00 0.10 a2 0.033 0.036 0.84 0.90 b 0.012 0.02 0.30 0.50 h 0.005 bsc 0.127 bsc d 0.114 bsc 2.90 bsc b 0.06 bsc 1.60 bsc e 0.0374 bsc 0.950 bsc c 0.11 bsc 2.80 bsc l 0.0118 0.02 0.30 0.50 0 4 0 4
november 2006 asm3p2872a rev 1.7 low power peak emi reducing solution 8 of 12 notice: the information in this document is subject to change without notice. 8-pin soic package d e h d a1 a2 a l c b e dimensions inches millimeters symbol min max min max a1 0.004 0.010 0.10 0.25 a 0.053 0.069 1.35 1.75 a2 0.049 0.059 1.25 1.50 b 0.012 0.020 0.31 0.51 c 0.007 0.010 0.18 0.25 d 0.193 bsc 4.90 bsc e 0.154 bsc 3.91 bsc e 0.050 bsc 1.27 bsc h 0.236 bsc 6.00 bsc l 0.016 0.050 0.41 1.27 0 8 0 8
november 2006 asm3p2872a rev 1.7 low power peak emi reducing solution 9 of 12 notice: the information in this document is subject to change without notice. e h a a1 a2 d b c l e 8-pin tssop dimensions inches millimeters symbol min max min max a 0.043 1.10 a1 0.002 0.006 0.05 0.15 a2 0.033 0.037 0.85 0.95 b 0.008 0.012 0.19 0.30 c 0.004 0.008 0.09 0.20 d 0.114 0.122 2.90 3.10 e 0.169 0.177 4.30 4.50 e 0.026 bsc 0.65 bsc h 0.252 bsc 6.40 bsc l 0.020 0.028 0.50 0.70 0 8 0 8
november 2006 asm3p2872a rev 1.7 low power peak emi reducing solution 10 of 12 notice: the information in this document is subject to change without notice. ordering information part number marking package type temperature asm3p2872af-06or b4ll 6-pin tsot-23, tape & reel, pb free commercial asm3p2872af-08tt 3p2872af 8-pin tssop, tube, pb free commercial asm3p2872af-08tr 3p2872af 8-pin tssop, tape & reel, pb free commercial asm3p2872af-08st 3p2872af 8-pin soic, tube, pb free commercial asm3p2872af-08sr 3p2872af 8-pin soic, tape & reel, pb free commercial asm3p2872ag-06or b3ll 6-pin tsot-23, tape & reel, green commercial asm3p2872ag-08tt 3p2872ag 8-pin tssop, tube, green commercial asm3p2872ag-08tr 3p2872ag 8-pin tssop, tape & reel, green commercial asm3p2872ag-08st 3p2872ag 8-pin soic, tube, green commercial asm3p2872ag-08sr 3p2872ag 8-pin soic, tape & reel, green commercial ASM3I2872AF-06OR b5ll 6-pin tsot-23, tape & reel, pb free industrial asm3i2872af-08tt 3i2872af 8-pin t ssop, tube, pb free industrial asm3i2872af-08tr 3i2872af 8-pin tssop, tape & reel, pb free industrial asm3i2872af-08st 3i2872af 8-pin soic, tube, pb free industrial asm3i2872af-08sr 3i2872af 8-pin soic, tape & reel, pb free industrial asm3i2872ag-06or b6ll 6-pin tsot- 23, tape & reel, green industrial asm3i2872ag-08tt 3i2872ag 8-pin tssop, tube, green industrial asm3i2872ag-08tr 3i2872ag 8-pin tsso p, tape & reel, green industrial asm3i2872ag-08st 3i2872ag 8-pin soic, tube, green industrial asm3i2872ag-08sr 3i2872ag 8-pin soic, tape & reel, green industrial
november 2006 asm3p2872a rev 1.7 low power peak emi reducing solution 11 of 12 notice: the information in this document is subject to change without notice. device ordering information asm3p2872af-08tr licensed under u.s patent nos 5,488,627 and 5,631,921 o = tsot23 u = msop j=tsot26 s = soic e = tqfp t = tssop l = lqfp a = ssop u = msop v = tvsop p = pdip b = bga d = qsop q = q fn x = sc-70 device pin count x= automotive i= industrial p or n/c = commercial (-40c to +125c) (-40c to +85c) (0c to +70c) 1 = reserved 6 = power management 2 = non pll based 7 = power management 3 = emi reduction 8 = power management 4 = ddr support products 9 = hi performance 5 = std zero delay buffer 0 = reserved pulsecore semiconducto r mixed signal product part number f = lead free and rohs compliant part g = green package, lead free, and rohs r = tape & reel, t = tube or tray
november 2006 asm3p2872a rev 1.7 low power peak emi reducing solution 12 of 12 notice: the information in this document is subject to change without notice. note: this product utilizes us patent # 6,646,463 impedance emulator patent issued to pulsecore semiconductor, dated 11-11-2003 ? copyright 2006 pulsecore semiconductor corporation. a ll rights reserved. our logo and name are trademarks or registered trademarks of pulsecore semiconductor. all other brand and product names may be the trademarks of their respective companies. pulsecore reserves the right to make ch anges to this document and its products at any time without notice. pulsecore assumes no responsibility for any errors t hat may appear in this document. the data contained herein represents pulsecore?s best data and/or esti mates at the time of issuance. pulsecore reserves the right to change or correct this data at any time, without notice. if the product described herein is under development, significant changes to these specifications are possibl e. the information in this product data sheet is intended to be general descriptive information for potential customers and users, and is not intended to operate as, or provide, an y guarantee or warrantee to any user or customer. pulsecore does not assume any responsibility or lia bility arising out of the application or use of any product described herein, and disclaims any express or implied warrant ies related to the sale and/or use of pulsecore products including liability or warranties related to fitness for a parti cular purpose, merchantability, or infringement of any intellec tual property rights, except as express agreed to in pulsecore? s terms and conditions of sale (which are available from pulsecore). all sales of pulsecore products are made exclusiv ely according to pulsecore?s terms and conditions of sale. the purchase of products from pulsecore does not convey a license under any paten t rights, copyrights; mask works rights, trademarks, or any other intellectual proper ty rights of pulsecore or third parties . pulsecore does not authorize its products for use as critical components in life-supporting systems wher e a malfunction or failure may reasonably be expected to result in significant injury to the user, and the inclusion of pulsec ore products in such life-supporting systems implies that the manufacturer assumes all risk of such use and agrees to inde mnify pulsecore against all claims arising from such use. pulsecore semiconductor corporation 1715 s. bascom ave suite 200 campbell, ca 95008 tel: 408-879-9077 fax: 408-879-9018 www.pulsecoresemi.com copyright pulsecore semiconductor all rights reserved part number: asm3p2872a document version: 1.7

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