asahi kasei emd corporation ms0971 - e - 00 dec - 10 - 1 - differential zero delay c lock buffer ak81 22 features operational frequency range: 160mhz ? 400mhz output delay: - 30 100ps low jitter performance: 2 0 ps ( period rms 190 ? 360mhz ) 3 0 ps ( cycle ? cycle rms 190 ? 360mhz ) 7 0 ps ( half period rms 190 ? 250mhz ) 6 0 ps ( half period rms 250 ? 300mhz ) 4 0 ps ( half period rms 300 ? 360mhz ) supply voltage: 1.8 0.1v operating temperature range: - 20 to +85 : AK8122E - 40 to +85 : ak8122v package: 8 - pin msop (lead free) description the ak81 22 is a high performance differential zero delay clock buffer ic with phase locked loop (pll). target application is ddr2 sdram and characteristics of these ics are acceptable to standards of jedec. applications ddr2 sdram clock buffer block diagram ak812 2 differential zero delay clock buffer clkp vdd vss outp outn clkn tsti (vss) tsto (vdd) fbinp fbinn bias c p l p f v c o p f c 1/2
ak8122 mar - 09 ms0971 - e - 00 - 2 - the brand name of akemd ? s ic ? s pin d escription s package: 8 - pin msop (top view) pin no. pin name pin type description 1 tsti in ic test pin (input) please tie vss to this pin. (1) 2 clkp in differential clock input (positive) 3 clkn in differential clock input (negative) 4 vss -- ground 5 vdd -- power supply 6 outn out differential clock output (negative) (2) 7 outp out differential clock output (positive) (2) 8 tsto out ic test pin (output) please tie vdd to this pin. (3) (1) internal pull down 100k w (typ.) ? (2) output will be ? l ? level if clkp = clkn = ? l ? . output clock frequency will be lower than 400mhz if clkp and clk n ar e fixed as ? h ? and ? l ? (or ? l ? and clkn= ? h ? ), respectively. setting clkp = clkn = ? h ? is prohibited. (3) output status is hi - z for normal operation. ordering information part number marking shipping packaging package temperature range ak8122 v 122v tape and reel 8 - pin m sop - 4 0 to 85 AK8122E 122e tape and reel 8 - pin m sop - 2 0 to 85 tsti 1 2 3 8 7 6 5 clkp vs s outn vdd tsto clkn out p
ak8122 ms0971 - e - 00 dec - 10 - 3 - the brand name of akemd ? s ic ? s absolute maximum rating over operating free - air temperature range unless otherwise noted (1) items s ymbol ratings unit s upply v oltage vdd - 0.3 to 4.6 v input voltage vin vss - 0.3 to vdd+0.3 v input c urrent (any pins except supplies) i in 10 ma storage t emperature tstg - 55 to 130 c note (1) stress beyond those listed under ? absolute maximum ratings ? may cause permanent damage to the device. these are stress ratings only. f unctional operation of the device at these or any other conditions beyond those indicated under ? recommended operating conditions ? is not implied. exposure to absolute - maximum - rating conditions for extended periods may affect device reliability. electrical par ameters are gua ranteed only over the recommended operating temperature range. this device is manufactured on a cmos process, therefore, generically susceptible to damage by excessive static voltage. failure to observe proper handling and installation procedures can cause damage . akemd recommends that this device is handled with appropriate precautions. recommended operation condition s parameter s ymbol conditions m in typ m ax unit operating t emperature 1 ta 1 - 4 0 85 c operating t emperature 2 ta 2 - 20 85 c supply voltage vdd 1.7 1.8 1.9 v input frequency 160 400 mhz high l evel i nput v oltage v ih pin: clkp, clkn 0 .65 vdd v low l evel i nput v oltage v il pin: clkp, clkn 0. 35 vdd v dc differenti al input voltage vidc pin: clkp, clkn 0. 3 v ac differential input voltage viac pin: clkp, clkn 0.6 vdd - 0.4 v pp differential input reference voltage viref 0.5vdd - 0.15 0.5vdd +0.15 v input slew rate isr 1 4 v/ns esd sensitive device
ak8122 mar - 09 ms0971 - e - 00 - 4 - the brand name of akemd ? s ic ? s dc characteristics all specifications at vdd: over 1.7 to 1.9v, ta =ta1(ak8122v) ta=ta2(AK8122E) parameter symbol conditions min typ max unit input c urrent i l pin: clkp, clkn - 10 + 1 0 a differential output reference voltage voref pin: outp, outn 0.5vdd - 0.1 0.5vdd +0.1 v ac differential output voltage (1) voac pin: outp, outn output load: fig.1 0. 5 vdd - 0.4 v high level o utput voltage v oh pin: outp, outn i oh = - 1 ma vdd - 0.1 v low l evel o utput voltage v ol pin: outp, outn i o l = +1 ma 0. 1 v input load capacitance pin: clkp, clkn 2.1 pf input load capacitance error pin: clkp, clkn 0.1 pf c urrent c onsumption (1) i dd (2) 50 ma (1) see fig.8 for output load reference . (2) output imped ance of 60 - ohm. no load. vdd = 1.8v, ta = 25. ac characteristics all specifications at vdd: over 1.7 to 1.9v, ta: - 20 to +85 , unless otherwise noted (1) see fig.1. (2) see fig.2. (3) see fig.3. (4) see fig.4. (5) see fig.8. (6) a provisional target value. parameter symbol conditions min typ max unit output frequency 160 400 mhz output slew rate (5) 1 3 v/ns input clock duty cycle 40 50 60 % delay time (1) sfo + dfo + skew 250mhz - 400mhz - 1 3 0 - 30 + 70 ps jit 1 period, 1 , 190 ? 360mhz (2) 20 p s jit 2 cycle - to - cycle, 1 , 190 ? 360mhz (3) 30 p s jit 3 half period, 1 , 190 ? 250mhz (4) 70 p s jit 4 half period, 1 , 250 ? 300mhz (4) 60 p s output clock jitter jit 5 half period, 1 , 300 ? 360mhz (4) 40 p s start up ti me (6) t lock 200 u s
ak8122 ms0971 - e - 00 dec - 10 - 5 - the brand name of akemd ? s ic ? s standards of jitter fig.1 delay (static phase offset + skew) : tdly = tdly/n fig.2 period jitter: tpj = tcycn ? 1/f0 fig.3 cycle to cycle jitter: tc2cj=tcn - tcn+1 fig.4 half period jitter: thpj = thp ? 1/2*f0 fig.5 input and output slew rate
ak8122 mar - 09 ms0971 - e - 00 - 6 - the brand name of akemd ? s ic ? s measurement condition fig.6 ibis model output load fig. 7 output load test circ uit 1 fig. 8 output load test circuit 2 v dd gnd v ckp v ckn v dd/2 r=30 r=30 v dd/2 - vdd/2 gnd z=25 z=30 gnd r=5 r=5 z=25 z=30 r=25 r=25 10pf 10pf - vdd/2 - vdd/2 v dd gnd gnd z=30 gnd r=60 z=30 r=1m r=1m 10pf 10pf gnd gnd 1pf 1pf
ak8122 ms0971 - e - 00 dec - 10 - 7 - the brand name of akemd ? s ic ? s assumed power up sequence
ak8122 mar - 09 ms0971 - e - 00 - 8 - the brand name of akemd ? s ic ? s package information mechanical data marking a: #1 pin index b: part number c: date code (3 digits) rohs compliance 5 4 8 122e yma 5 4 8 122v yma all integrated circuits form asahi kasei emd corporation (akemd) assembled in ?lead - free? packages* are fully compliant with rohs. (*) rohs compliant products from akemd are identified with ?pb free? letter indication on product label poste d on the anti - shield bag and boxes.
ak8122 ms0971 - e - 00 dec - 10 - 9 - the brand name of akemd ? s ic ? s important notice l these products and their specifications are subject to change without notice. when you consider any use or application of these products, please make inquiries the sales office of asahi kasei emd c orporation (akemd) or authorized distributors as to current status of the products. l akemd assumes no liability for infringement of any patent, intellectual property, or other rights in the application or use of any information contained herein. l any export of these products, or devices or systems containing them, may require an export license or other official approval under the law and regulations of the country of export pertaining to customs and tariffs, currency exchange, or strategic materials. l akemd products are neither intended nor authorized for use as critical components note1) in any safety, life support, or other hazard related device or system note2) , and akemd assumes no responsibility for such use, except for the use approved with the expr ess written consent by representative director of akemd. as used here: note1) a critical component is one whose failure to function or perform may reasonably be expected to result, whether directly or indirectly, in the loss of the safety or effectiveness of the device or system containing it, and which must therefore meet very high standards of performance and reliability. note2) a hazard related device or system is one designed or intended for life support or maintenance of safety or for applications in m edicine, aerospace, nuclear energy, or other fields, in which its failure to function or perform may reasonably be expected to result in loss of life or in significant injury or damage to person or property. l it is the responsibility of the buyer or distrib utor of akemd products, who distributes, disposes of, or otherwise places the product with a third party, to notify such third party in advance of the above content and conditions, and the buyer or distributor agrees to assume any and all responsibility an d liability for and hold akemd harmless from any and all claims arising from the use of said product in the absence of such notification.
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