alliance semiconductor 2575 augustine drive ? santa clara ca ? tel: 408-855-4900 ? fax: 408-855-4999 ? www.alsc.com rev 1.1 november 2003 asm3p2111a features ? generates an emi optimized clocking signal at output. ? input frequency ? 25 mhz. ? frequency outputs: o 60 mhz (unmodulated) o 2 x 48 mhz (unmodulated) o 66.6 mhz (modulated) -1.7% down spread ? modulation rate: 30 khz. ? supply voltage range 3.3v ( 0.3v). ? available in 8-pin soic package. ? commercial and industrial temperature range. product description the asm3p2111a is a versatile spread spectrum frequency modulator. the asm3p2111a reduces electromagnetic interference (emi) at the clock source. the asm3p2111a allows significant system cost savings by reducing the number of circuit board layers and shielding that are required to pass emi regulations. the asm3p2111a modulates the output of pll in order to spread the bandwidth of a synthesized clock, thereby decreasing the peak amplitu des of its harmonics. this results in significantly lower system emi compared to the typical narrow band signal produced by oscillators and most clock generators. lowering emi by increasing a signal?s bandwidth is called spread spectrum clock generation. applications asm3p2111a is targeted towards emi management for high speed digital applications such as pc peripheral devices, consumer electronics and embedded controller systems. block diagram v dd crystal oscillator 66.6 mhz modulated xin xout v ss 48 mhz_2 60 mhz 48 mhz_1 pll1 pll2 48 mhz_1
peak reducing emi solution 2 of 8 rev 1.1 november 2003 asm3p2111a pin configuration pin description pin name type description xin i connection to crystal xout o connection to crystal v dd p power supply for the analog and digital blocks 60 mhz o clock output-1 60 mhz unmodulated 48 mhz_2 o clock output-2 48 mhz_2 unmodulated 48 mhz_1 i/o clock output-3 48 mhz_1 unmodulated 66.6 mhz i clock output -4 66.6 mhz modulated v ss p ground to entire chip 60 mhz v ss xout xin v dd 8 7 6 5 1 2 3 4 asm3p2111a 48 mhz_2 48 mhz_1 66.6 mhz
peak reducing emi solution 3 of 8 rev 1.1 november 2003 asm3p2111a absolute maximum ratings symbol parameter rating unit v dd supply voltage, dc (v ss ? 0.5) to 7 v v i input voltage, dc (v ss -0.5) to (v dd +0.5) v v o output voltage, dc (v ss -0.5) to (v dd + 0.5) v i ik input clamp current (v i <0 or v i >v dd ) -50 to +50 ma i ok output clamp current (v i <0 or v i >v dd ) -50 to +50 ma t s storage temperature -65 to +125 c t a ambient temperature range, under bias -55 to 125 c t j junction temperature 150 c lead temperature (soldering 10 sec) 260 c input static discharge voltage protection (mil ?std 883e, method 3015.7) 2 kv note: these are stress ratings only and functional oper ation is not implied. exposure to absolute maximum ratings for extended periods may affect device reliability. operating conditions crystal specifications fundamental at cut parallel resonant crystal nominal frequency 25 mhz 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 ? parameter symbol condition / description min typ max unit supply voltage v dd 3.3v 10% 3 3.3 3.6 v ambient operating temperature range t a -10 +70 c crystal resonator frequency f xin 25 mhz output driver load capacitance c l 15 pf
peak reducing emi solution 4 of 8 rev 1.1 november 2003 asm3p2111a dc electrical characteristics parameter symbol conditions / description min typ max unit overall supply current, dynamic i dd v dd =3.3v, f clk =25mhz, c l =15pf 43 ma supply current, static i ddl v dd = 3.3v, software power down tbd ma all input pins high-level input voltage v ih v dd =3.3v 2.0 v dd +0.3 v low-level input voltage v il v dd =3.3v v ss -0.3 0.8 v high-level input current i ih -1 1 clock outputs high-level output source current i oh v o =2.4v -20 ma low-level output sink current i ol v o =0.4v 23 ma z oh v o =0.5v dd ; output driving high 29 ?
peak reducing emi solution 5 of 8 rev 1.1 november 2003 asm3p2111a ac electrical characteristics parameter symbol conditions/ description min typ max unit rise time t r v o = 0.3v to 3.0v; c l = 15pf 2.1 ns fall time t f v o = 3.0v to 0.3v; c l = 15pf 1.9 ns clock duty cycle ratio of pulse width (as measured from rising edge to next falling edge at 2.5v) to one clock period 45 55 % on rising edges 500 s apart at 2.5 v relative to an ideal clock, pll b inactive * 45 ps jitter, long term tj (lt) on rising edges 500 s apart at 2.5 v relative to an ideal clock, pll b active * 165 from rising edge to next rising edge at 2.5 v, pll b inactive * 110 ps jitter, peak to peak tj ( ? t) from rising edge to next rising edge at 2.5 v, pll b active * 390 * cl = 15 pf, input clock frequency = 12.75 mhz, output frequency = 51 mhz
peak reducing emi solution 6 of 8 rev 1.1 november 2003 asm3p2111a package information 8-pin soic package dimensions in inches dimensions in millimeters symbol min max min max a 0.053 0.069 1.35 1.75 a1 0.004 0.010 0.10 0.25 b 0.013 0.022 0.33 0.53 c 0.007 0.012 0.18 0.27 d 0.188 0.197 4.78 5.00 e 0.150 0.158 3.80 4.01 h 0.228 0.244 5.80 6.20 e 0.050 bsc 1.27 bsc l 0.016 0.035 0.40 0.89 0 8 0 8
peak reducing emi solution 7 of 8 rev 1.1 november 2003 asm3p2111a ordering codes part number package configuration temperature range asm3p2111af-08-st 08-pin soic tube commercial ASM3P2111AF-08-SR 08-pin soic tape & reel commercial asm3i2111af-08-st 08-pin soic tube industrial asm3i2111af-08-sr 08-pin soic tape & reel industrial ordering information ASM3P2111AF-08-SR licensed under us patent #5,488,627, # 6,646,463 and #5,631,920. pin count x = automotive i = industrial p or n/c = commercial 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 dela y buffe r 0 - reserved alliance semiconductor mixed signal product part number pb free or - sot23/t/r st ? soic, tube tt - tssop, tube sr ? soic, t/r tr ? tssop, t/r qr ? qfn, t/r qt ? qfn, tube vt ? tvsop, tube bt ? bga, tube vr ? tvsop, t/r br ? bga, t/r jr ? ssop, t/r jt ? ssop, tube
peak reducing emi solution 8 of 8 rev 1.1 november 2003 asm3p2111a alliance semiconductor corporation 2575, augustine drive, santa clara, ca 95054 tel# 408-855-4900 fax: 408-855-4999 www.alsc.com ? copyright 2003 alliance semiconductor corporation. all rights reserved. our three-point logo, our name and intelliwatt are trademarks or registered trademarks of alliance. all other brand and product names may be the trademarks of their respective companies. alliance reserves the right to make ch anges to this document and its products at any time without notice. alliance assumes no responsibility for any errors t hat may appear in this document. the data contained herein represents alliance's best data and/or estimate s at the time of issuance. alliance rese rves 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 possible. the information in this product data sheet is intended to be general descriptive information for potential customers and users, and is not in tended to operate as, or provide, any guarantee or warrantee to any user or customer. alliance does not assume any responsibility or lia bility arising out of the applic ation or use of any product described herein, and disclaims any express or implied warrant ies related to the sale and/or use of alliance products including liability or warranties related to fitness for a particular purpose, mercha ntability, or infringement of any intellec tual property rights, except as express agreed to in alliance's terms and conditions of sale (which are available from alliance). all sales of alliance products are made exclusively according to alliance's terms and conditions of sale. the purchase of products from alliance does not convey a license under any pa tent rights, copyrights; mask works rights, trademarks, or any other intellectual property rights of alli ance or third parties. alliance does not aut horize its products for use as critical components in life-supporting systems where a malfunction or fa ilure may reasonably be expected to result in significant injury to the user, and the inclusion of alliance products in such life-supporting systems implies that the manufacturer assumes all risk of such use and agrees to indemnify alliance against all claims arising from such use. copyright ? alliance semiconductor all rights reserved preliminary information part number: asm3p2111a document version: v1.1 note: this product utilizes us patent # 6, 646,463 impedance emulator patent issued to dan hariton / alliance semiconductor, dat ed 11-11-2003
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