___________________________________________________ ___________________________________________________ _______________________ _________________ dsc2311 page 1 mk - qb -p-d-130103- 04 crystal- less? configurable two output clock generator dsc2311 general description the dsc2311 is a crystal-less clock generator that is factory configurable to simultaneously output two separate frequencies from 2.3 to 170 mhz. the clock generator uses proven silicon mems technology to provide low jitter and high frequency stability across a wide range of supply voltages and temperatures. by eliminating the external quartz crystal, crystal-less clock generators significantly enhance reliability and accelerate product development, while meeting stringent clock performance criteria for a variety of consumer electronics, communications, and storage applications. dsc2311 has an output enable / disable feature allowing it to disable the outputs when oe is low. the device is available in a space saving 6 pin 2.5 x 2.0 mm crystal- less tdfn packa ge that uses only a single external bypass capacitor. this requires a pcb footprint equivalent to that of a 1.0 x 1.0 mm crystal-based clock generator. block diagram control circuitry mems pll output control and divider fout2 fout1 oe applications ? consumer electronics ? camera and imaging modules ? home automation ? industrial and power conversion ? mobile communications, internet, and sensor devices ? solid state, hard drive, and flash drive storage features ? two simultaneous cmos outputs : o output 1 range: 2.3 to 170 mhz o output 2 range: 2.3 to 170 mhz ? low rms phase jitter: <1 ps (typ) ? high stability: 25, 50 ppm ? wide temperature range o automotive : -55 to 125 c o ext. industrial: -40 to 105 c o industrial: -40 to 85 c o ext. commercial: -20 to 70 c ? high supply noise rejection: -50 dbc ? high shock & vibration immunity o qualified to mil-std- 883 ? high reliability o 20x higher mtbf than crystal-based clock generator designs ? supply range of 2.25 to 3.6 v ? short lead times: 2 weeks ? lead free & rohs compliant downloaded from: http:///
___________________________________________________ ___________________________________________________ _______________________ _________________ dsc2311 page 2 mk - qb -p-d-130103- 04 dsc2311 crystal-less ? configurable two output clock generator specifications (unless specified otherwise: t=25 c , vdd =3.3v ) notes: 1. pin 4 v dd should be filtered with 0.01uf capacitor. 2. output is enabled if enable pad is floated or not connecte d. operating current = discabled current + idd from fout1 + idd from fout2. see curren t consumption graph on next page. 3. t su is time to 100ppm stable output frequency after v dd is applied and outputs are enabled. 4. output waveform and test circuit figures below define the parameters. 5. period jitter includes crosstalk from adjacent output. 6. for other ppm stabilities, contact the factory at sales@discera.com absolute maximum ratings item min max unit condition supply voltage -0.3 +4.0 v input voltage -0.3 v dd +0.3 v junction temp - +150 c storage temp - 55 +150 c soldering temp - +260 c 40sec max. esd hbm mm cdm - 4000 400 1500 v parameter condition min. typ. max. unit supply voltage 1 v dd 2.25 3.6 v supply current 2 i dd en pin low C outputs are disabled 21 23 ma frequency stability 6 f includes frequency variations due to initial tolerance, temp. and power supply voltage 25 50 ppm aging f 1 year @ 25c 5 ppm startup time 3 t su t= 25c 5 ms input logic levels input logic high input logic low v ih v il 0.75xv dd - - 0.25xv dd v output disable time 4 t da 5 ns output enable time t en 20 ns pull-up resistor 2 pull-up exists on all digital io 40 k output logic levels output logic high output logic low v oh v ol i= 6ma 0.9xv dd - - 0.1xv dd v output transition time 4 rise time fall time t r t f 20% to 80% c l =15pf 1.1 1.4 2 2 ns frequency f 0 commercial/industrial temp range automotive temp range 2.3 170 100 mhz output duty cycle sym 45 55 % period jitter 5 j per f o1 =f o2 =25 mhz 3 ps rms integrated phase noise j cc 200khz to 20mhz @ 2 5 mhz 100khz to 20mhz @ 2 5 mhz 12khz to 20mhz @ 2 5 mhz 0.3 0.38 1.7 2 ps rms downloaded from: http:///
___________________________________________________ ___________________________________________________ _______________________ _________________ dsc2311 page 3 mk - qb -p-d-130103- 04 dsc2311 crystal-less ? configurable two output clock generator current consumption total current = disabled current + idd fout1 + idd fout2 solder reflow profile 0 2 4 6 8 10 12 14 16 18 0 20 40 60 80 100 120 140 idd ma fout mhz idd / output vs. freq & load @ 3.3v vdd 3pf 5pf 10pf 15pf 6 qfn msl 1 @ 260c refer to jstd-020c ramp-up rate (200c to peak temp) 3c/sec max. preheat time 150c to 200c 60 - 180 sec time maintained above 217c 60 -150 sec peak temperature 255 - 260 c time within 5c of actual peak 20 -40 sec ramp-down rate 6c/sec max. time 25c to peak temperature 8 min max. 60 -150 sec 20 - 40 sec 60 -180 sec 8 min max pre heat reflow cool time temperature ( c) 3c/sec max. 6c/sec max. 200 c 217 c 150 c 25 c 260 c 3c/sec max. 60 -150 sec 20 - 40 sec 60 -180 sec 8 min max pre heat reflow cool time temperature ( c) 3c/sec max. 6c/sec max. 200 c 217 c 150 c 25 c 260 c 60 -150 sec 20 - 40 sec 60 -180 sec 8 min max pre heat reflow cool time temperature ( c) 3c/sec max. 6c/sec max. 200 c 217 c 150 c 25 c 260 c 3c/sec max. downloaded from: http:///
___________________________________________________ ___________________________________________________ _______________________ _________________ dsc2311 page 4 mk - qb -p-d-130103- 04 dsc2311 crystal-less ? configurable two output clock generator oe function and output waveform: lvcmos package dimensions 1 2 3 4 6 5 2.50.05 [0.0980.002] 2.00.05 [0.0790.002] 1 2 3 4 6 5 0.250.05 [0.0990.002] 0.650.05 [0.0260.002] 0.825 [0.032] 0.70.1 [0.0790.002] 0.7650.1 0.535 ref 0.6 ref 0.70.1 [0.0790.002] 0.850.05 0.250.05 [0.0990.002] 0.650.05 [0.0260.002] 0.85 0.7 ref 1 2 3 4 5 6 0.375 via to power trace via to ground plane no. pin terminal 1 enable 2 n/c 3 ground 4 5 clk1 6 vdd clk0 external dimensions units: mm [ inches] recommended solder pad layout units: mm [ inches] v oh v ol v il 1/f o output enable t da t en t f t r v ih downloaded from: http:///
___________________________________________________ ___________________________________________________ _______________________ _________________ dsc2311 page 5 mk - qb -p-d-130103- 04 dsc2311 crystal-less ? configurable two output clock generator ordering information output clock frequencies output frequencies are factory configured to individual customer and product requirements, subject to output control and divider limitations. contact sales with your custom frequency needs. fr equency code fout1 mhz fout2 mhz r0001 127 127 r0002 25 125 disclaimer: micrel makes no representations or warranties with respec t to the accuracy or completeness of the information fu rnished in this data sheet. this information is not intended as a warranty and micrel does not assum e responsibility for its use. micrel reserves the right t o change circuitry, specifications and descriptions at any time without notice. no license, wheth er express, implied, arising by estoppel or otherwise, to any intellectual property rights is granted by this document. except as provided in micrel s terms and conditions of sale for such products, micrel a ssumes no liability whatsoever, and micrel disclaims any express or implied warranty relating to the sale and/or us e of micrel products including liability or warranties relating t o fitness for a particular purpose, merchantability, or infringement of any patent, copyright or other intellectual property right. micrel products are not designed or authorized for use a s components in life support appliances, devices or syste ms where malfunction of a product can reasonably be expected to result in personal injury. life support devices or systems are devices or systems that (a) are intended for surgical implant into the body or (b) support or sustain life, and whose failure to perform can be reasonably ex pected to result in a significant injury to the user. a pu rchasers use or sale of micrel products for use in life support appliances , devices or systems is a purchasers own risk and pu rchaser agrees to fully indemnify micrel for any damages resulting from such use or sale. micrel, inc. 2180 fortune drive, san jose, california 95131 usa phone: +1 (408) 944-0800 fax: +1 (408) 474 -1000 email: hbwhelp@micrel.com www.micrel.com dsc2311 packing t: tape & reel : tube k i 2 package k : 2520 qfn package temp range e: -20 to 70 i: -40 to 85 l: -40 to 105 m: -55 to 125 stability 1: 50ppm 2: 25ppm t frequency code rxxxx: custom r0001 - downloaded from: http:///
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