1 precision edge sy100s838 sy100s838l micrel, inc. m9999-113006 hbwhelp@micrel.com or (408) 955-1690 the sy100s838/l is a low skew ( 1, 2/3) or ( 2, 4/ 6) clock generation chip designed explicitly for low skew clock generation applications. the internal dividers are synchronous to each other, therefore, the common output edges are all precisely aligned. the devices can be driven by either a differential or single-ended ecl or, if positive power supplies are used, pecl input signal. in addition, by using the v bb output, a sinusoidal source can be ac- coupled into the device. if a single-ended input is to b e used, the v bb output should be connected to the clk input and bypassed to ground via a 0.01 f capacitor. the v bb output is designed to act as the switching reference for the input of the sy100s838/l under single- ended input conditions. as a result, this pin can only source/sink up to 0.5ma of current. the function select (f sel ) input is used to determine what clock generation chip function is. when fs el input is low, sy100s838/l functions as a divide by 2 and by 4/6 clock generation chip. however, if fs el input is high, it functions as a divide by 1 and by 2/3 clock chip. the common enable (en) is synchronous so that the internal dividers will only be enabled/disabled when the internal clock is already in the low state. this avoids any chance of generating a runt clock pulse on the internal clock when the device is enabled/disabled as can happen with an asynchronous control. an internal runt pulse could lead to losing synchronization between the internal divider stages. the internal enable flip-flop is clocked on the falling edge of the input clock, therefore, all associated specification limits are referenced to the negative edge of the clock input. upon start-up, the internal flip-flops will attain a rando m state; the master reset (mr) input allows for the synchronization of the internal dividers, as well as for multiple sy100s838/ls in a system. 3.3v and 5v power supply options 50ps output-to-output skew synchronous enable/disable master reset for synchronization internal 75k ? input pull-down resistors available in 20-pin soic package description features rev.: g amendment: /0 issue date: november 2006 ( 1, 2/3) or ( 2, 4/6) clock generation chip precision edge sy100s838 sy100s838l pin function clk differential clock inputs f sel function select input en synchronous enable mr master reset v bb reference output q 0, q 1 differential 1 or 2 outputs q 2, q 3 differential 2/3 or 4/6 outputs divsel frequency select input pin names f sel divsel q 0, q 1 outputs q 2, q 3 outputs ll divide by 2 divide by 4 lh divide by 2 divide by 6 hl divide by 1 divide by 2 hh divide by 1 divide by 3 clk en mr function zll divide zz h l hold q 0C3 xxh reset q 0C3 truth table notes: z = low-to-high transition zz = high-to-low transition precision edge is a registered trademark of micrel, inc. precision edge downloaded from: http:///
2 precision edge sy100s838 sy100s838l micrel, inc. m9999-113006 hbwhelp@micrel.com or (408) 955-1690 package/ordering information 20-pin soic (z20-1) ordering information package operating package lead part number type range marking finish sy100s838zc z20-1 commercial sy100s838zc sn-pb sy100s838zctr (1) z20-1 commercial sy100s838zc sn-pb sy100s838lzc z20-1 commercial sy100s838lzc sn-pb sy100s838lzctr (1) z20-1 commercial sy100s838lzc sn-pb sy100s838zi z20-1 industrial sy100s838zi sn-pb sy100s838zitr (1) z20-1 industrial sy100s838zi sn-pb sy100s838lzi z20-1 industrial sy100s838lzi sn-pb sy100s838lzitr (1) z20-1 industrial sy100s838lzi sn-pb sy100s838zg (2) z20-1 industrial sy100s838zg with nipdau pb-free bar-line indicator pb-free sy100s838zgtr (1, 2) z20-1 industrial sy100s838zg with nipdau pb-free bar-line indicator pb-free SY100S838LZG (2) z20-1 industrial SY100S838LZG with nipdau pb-free bar-line indicator pb-free SY100S838LZGtr (1, 2) z20-1 industrial SY100S838LZG with nipdau pb-free bar-line indicator pb-free notes: 1. tape and reel. 2. pb-free package is recommended for new designs. v cc q 0 q 0 q 1 q 1 q 2 q 2 q 3 q 3 v ee v cc en divsel clk clk v bb mr v cc nc f sel 1 2 3 4 5 6 7 8 9 10 20 19 18 17 16 15 14 13 12 11 top view soic z20-1 downloaded from: http:///
3 precision edge sy100s838 sy100s838l micrel, inc. m9999-113006 hbwhelp@micrel.com or (408) 955-1690 t a = C40 ct a = 0 ct a = +25 ct a = +85 c symbol parameter min. typ. max. min. typ. max. min. typ. max. min. typ. max . unit i ee power supply current 35 50 65 35 50 65 35 50 65 35 54 75 ma v bb output reference voltage -1.38 -1.26 -1.38 -1.26 -1.38 -1.26 -1.3 8 -1.26 v i ih input high current 150 150 150 150 a block diagram dc electrical characteristics (1) v ee = v ee (min.) to v ee (max.); v cc = gnd note: 1. parametric values specified at: 5 volt power supply range 100s838 series: -4.2v to -5.5v. 3 volt power supply range 100s838l series -3.0v to -3.8v. en r mr divsel cl k cl k q 2 q 2 q 3 q 3 1 2 2 or 3 4 or 6 q 0 q 0 q 1 q 1 f se l 1 0 1 0 downloaded from: http:///
4 precision edge sy100s838 sy100s838l micrel, inc. m9999-113006 hbwhelp@micrel.com or (408) 955-1690 timing diagram q (1) q (2) q (3) clk q (4) q (6) t a = C40 ct a = 0 ct a = +25 ct a = +85 c symbol parameter min. typ. max. min. typ. max. min. typ. max. min. typ. max . unit f max maximum toggle frequency 1000 1000 1000 1000 mhz t plh propagation delay to output ps t phl clk ? output (diff.) 950 1150 950 1150 970 1170 1050 1250 clk ? output (s.e.) 900 1200 900 1200 920 1220 1000 1300 mr ? q 600 900 600 900 600 900 600 900 t skew within-device skew (2) q0 q3 50 50 50 50 ps part-to-part q0 q3 (diff.) 200 200 200 200 t s set-up time en ? clk 300 150 300 150 300 150 300 150 ps divsel ? clk 300 300 300 300 t h hold time clk ? en 400 150 400 150 400 150 400 150 ps clk ? divsel 400 200 400 200 400 200 400 200 v pp minimum input swing (3) clk 250 250 250 250 mv v cmr common mode range (4) clk (4) -0.55 (4) -0.55 (4) -0.55 (4) -0.55 v t rr reset recovery time 100 100 100 100 ps t pw minimum pulse width clk 800 800 800 800 ps mr 700 700 700 700 tr output rise/fall times q 280 550 280 550 280 550 280 550 ps tf (20% 80%) ac electrical characteristics (1) v ee = v ee (min.) to v ee (max.); v cc = gnd notes: 1. parametric values specified at: 5 volt power supply range 100s838 series: -4.2v to -5.5v. 3 volt power supply range 100s838l series -3.0v to -3.8v. 2. skew is measured between outputs under identical transitions. 3. minimum input swing for which ac parameters are guaranteed. t he device will function reliably with differential inputs down to 100mv. 4. the cmr range is referenced to the most positive side of the differential input signal. normal operation is obtained if the high level falls within the specified range and the peak-to-peak voltage lies between v pp (min) and 1.0v. the lower end of the cmr range is dependen t on v ee and is equal to v ee +1.65v. downloaded from: http:///
5 precision edge sy100s838 sy100s838l micrel, inc. m9999-113006 hbwhelp@micrel.com or (408) 955-1690 20-pin soic .300" wide (z20-1) rev. 03 micrel, inc. 2180 fortune drive san jose, ca 95131 usa tel + 1 (408) 944-0800 fax + 1 (408) 474-1000 web http://www.micrel.com the information furnished by micrel in this datasheet is belie ved to be accurate and reliable. however, no responsibility is assumed by micrel for its use. micrel reserves the right to change circuitry and specifications at an y time without notification to the customer. micrel products are not designed or authorized for use as components in life support appliances, devices or systems where malfunction of a product can reasonably be expected to result in personal injury. life suppo rt devices or systems are devices or systems that (a) are intended for surgica l implant into the body or (b) support or sustain life, and whose failure to perform can be reasonably expected to result in a significant in jury to the user. a purchasers use or sale of micrel products for use in life support appliances, devices or systems is at purchasers own risk and purchaser agrees to fully in demnify micrel for any damages resulting from such use or sale. ? 2006 micrel, incorporated. downloaded from: http:///
|
