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? semiconductor components industries, llc, 2010 october, 2010 -- rev. 8 1 publication order number: nb2308a/d nb2308a 3.3 v zero delay clock buffer the nb2308a is a versatile, 3.3 v zero delay buffer designed to distribute high--speed clocks. it is available in a 16 pin package. the part has an on--chip pll which locks to an input clock presented on the ref pin. the pll feedback is required to be driven to fbk pin, and can be obtained from one of the outputs. the input--to--output propagation delay is guaranteed to be less than 250 ps, and the output--to--output skew is guaranteed to be less than 200 ps. the nb2308a has two banks of four outputs each, which can be controlled by the select inputs as shown in the select input decoding table. if all the output clocks are not required, bank b can be three--stated. the select input also allows the input clock to be directly applied to the outputs for chip and system testing purposes. multiple nb2308a devices can accept the same input clock and distribute it. in this case the skew between the outputs of the two devices is guaranteed to be less than 700 ps. the nb2308a is available in five different configurations (refer to nb2308a configurations table). the nb2308ai1 is the base part, where the output frequencies equal the reference if there is no counter in the feedback path. the nb2308ai1h is the high--drive version of the --1 and the rise and fall times on this device are much faster. the nb2308ai2 allows the user to obtain 2x and 1x frequencies on each output bank. the exact configuration and output frequencies depends on which output drives the feedback pin. the nb2308ai3 allows the user to obtain 4x and 2x frequencies on the outputs. the nb2308ai4 enables the user to obtain 2x clocks on all outputs. thus, the part is extremely versatile, and can be used in a variety of applications. the nb2308ai5h is a high--drive version with ref/2 on both banks. features ? zero input -- output propagation delay, adjustable by capacitive load on fbk input ? multiple configurations -- refer t o nb2308a configurations table ? input frequency range: 15 mhz to 133 mhz ? multiple low--skew outputs ? output--output skew less than 200 ps ? device--device skew less than 700 ps ? two banks of four outputs, three--stateable by two select inputs ? less than 200 ps cycle--to--cycle jitter ? available in 16--pin soic and tssop packages ? 3.3 v operation ? guaranteed across commercial and industrial temperature ranges ? advanced 0.35 m cmos technology ? these are pb--free devices marking diagrams* xxxx = device code a = assembly location wl, l = wafer lot y = year ww, w = work week gor g = pb--free package (note: microdot may be in either location) *for additional marking information, refer to application note and8002/d. see detailed ordering and shipping information in the package dimensions section on page 9 of this data sheet. ordering information http://onsemi.com soic--16 d suffix case 751b 1 16 1 16 1 16 1 16 xxxx xxxx alyw g g xxxxxxxxxg awlyww tssop--16 dt suffix case 948f
nb2308a http://onsemi.com 2 fbk clka1 clka2 clka3 clka4 pll mux clkb1 clkb2 clkb3 clkb4 select input decoding figure 1. block diagram (see figures 11, 12, 13, 14 and 15 for device specific block diagrams) ref s2 s1 extra divider (--2, --3) extra divider (--5h) extra divider (--3, --4) 2 2 2 table 1. configurations device feedback from bank a frequency bank b frequency nb2308ai1 bank a or bank b reference reference nb2308ai1h bank a or bank b reference reference nb2308ai2 bank a reference reference 2 nb2308ai2 bank b 2 x reference reference nb2308ai3 bank a 2 x reference reference or reference (note 1) nb2308ai3 bank b 4 x reference 2 x reference nb2308ai4 bank a or bank b 2 x reference 2 x reference nb2308ai5h bank a or bank b reference 2 reference 2 1. output phase is indeterminant (0 ? or 180 ? from input clock). if phase integr ity is required, use the nb2308ai2. table 2. select input decoding s2 s1 clock a1 -- a4 clock b1 -- b4 output source pll shutdown 0 0 three--state three--state pll y 0 1 driven three--state pll n 1 0 driven (note 2) driven reference y 1 1 driven driven pll n 2. outputs inverted on 2308--2 and 2308--3 in bypass mode, s2 = 1 and s1 = 0.
nb2308a http://onsemi.com 3 figure 2. pin configuration v dd 1 2 3 4 16 15 14 13 ref clka1 clka2 gnd fbk clka4 clka3 nb2308a v dd 5 6 7 8 12 11 10 9 clkb1 clkb2 s2 clkb4 clkb3 s1 gnd table 3. pin description pin # pin name description 1 ref (note 3) input reference frequency, 5 v tolerant input. 2 clka1 (note 4) buffered clock output, bank a. 3 clka2 (note 4) buffered clock output, bank a. 4 v dd 3.3 v supply. 5 gnd ground. 6 clkb1 (note 4) buffered clock output, bank b. 7 clkb2 (note 4) buffered clock output, bank b. 8 s2 (note 5) select input, bit 2. 9 s1 (note 5) select input, bit 1. 10 clkb3 (note 4) buffered clock output, bank b. 11 clkb4 (note 4) buffered clock output, bank b. 12 gnd ground. 13 v dd 3.3 v supply. 14 clka3 (note 4) buffered clock output, bank a. 15 clka4 (note 4) buffered clock output, bank a. 16 fbk pll feedback input. 3. weak pulldown. 4. weak pulldown on all outputs. 5. weak pullup on these inputs.
nb2308a http://onsemi.com 4 table 4. maximum ratings parameter min max unit supply voltage to ground potential -- 0 . 5 +7.0 v dc input voltage (except ref) -- 0 . 5 v dd +0.5 v dc input voltage (ref) -- 0 . 5 7 v storage temperature -- 6 5 +150 ? c maximum soldering temperature (10 sec) 260 ? c junction temperature 150 ? c static discharge voltage (per mil--std--883, method 3015) >2000 v stresses exceeding maximum ratings may dam age the device. maximum ratings are stres s ratings only. functional operation above the recommended operating conditions is not impli ed. extended exposure to stresses above the re commended operating conditions may affect device reliability. table 5. operating conditions parameter description min max unit v dd supply voltage 3.0 3.6 v t a operating temperature (ambient temperature) industrial commercial -- 4 0 0 85 70 ? c c l load capacitance, below 100 mhz 30 pf c l load capacitance, from 100 mhz to 133 mhz 15 pf c in input capacitance (note 6) 7 pf 6. applies to both ref clock and fbk. table 6. electrical characteristics v cc = 3.0 v to 3.6 v, gnd = 0 v, t a =--40 ? cto+85 ? c parameter description test conditions min max unit v il input low voltage 0.8 v v ih input high voltage 2.0 v i il input low current v in =0v 50.0 m a i ih input high current v in =v dd 100.0 m a v ol output low voltage i ol = 8 ma (--1, --2, --3, --4) i ol =12ma(--1h,--5h) 0.4 v v oh output high voltage i oh = --8 ma (--1, --2, --3, --4) i oh = --12 ma (--1h, --5h) 2.4 v i dd supply current (note 7) unloaded outputs 100 mhz ref -- 2 , -- 3 , -- 4 49 ma select inputs at v dd or gnd -- 1 h , -- 5 h 60 ma unloaded outputs, 66 mhz ref (--1, --2, --3, --4) 34 ma unloaded outputs, 33 mhz ref (--1, --2, --3, --4) 18 ma 7. supply currents are measured for pll--bypass mode (s2 = 1, s1 = 0).
nb2308a http://onsemi.com 5 table 7. switching characteristics v cc = 3.0 v to 3.6 v, gnd = 0 v, t a =--40 ? cto+85 ? c parameter description test conditions min typ max unit t 1 output frequency 30 pf load (all devices) 15 pf load (--1h, --5h) 15 pf load (--1, --2, --3, --4) 15 15 15 100 133.3 133.3 mhz t 1 duty cycle = (t 2 /t 1 ) * 100 (all devices) measured at 1.4 v, f out = < 66.66 mhz 30 pf load 40.0 50.0 60.0 % measured at 1.4 v, f out =<50mhz 15 pf load 45.0 50.0 55.0 t 3 output rise time (--1, --2, --3, --4) measured between 0.8 v and 2.0 v 30 pf load 2.20 ns measured between 0.8 v and 2.0 v 15 pf load 1.50 output rise time (--1h, --5h) measured between 0.8 v and 2.0 v 30 pf load 1.50 t 4 output fall time (--1, --2, --3, --4) measured between 2.0 v and 0.8 v 30 pf load 2.20 ns measured between 0.8 v and 2.0 v 15 pf load 1.50 output fall time (--1h, --5h) measured between 2.0 v and 0.8 v 30 pf load 1.25 t 5 output--to--output skew on same bank (--1, --2, --3, --4) all outputs equally loaded 200 ps output--to--output skew (--1h, --5h) all outputs equally loaded 200 output bank a--to--output bank b skew (--1, --4, --5h) all outputs equally loaded 200 output bank a--to--output bank b skew (--2, --3) all outputs equally loaded 400 t 6 delay, ref rising edge to fbk rising edge measured at v dd /2 0 ? 250 ps t 7 device--to--device skew measured at v dd /2 on the fbk pins of the device 0 700 ps t j cycle--to--cycle jitter (--1, --1h, --4, --5h) measured at 66.67 mhz, loaded outputs, 15 pf load 200 ps measured at 66.67 mhz, loaded outputs, 30 pf load 200 measured at 133.3 mhz, loaded outputs 15 pf load 100 cycle--to--cycle jitter (--2, --3) measured at 66.67 mhz, loaded outputs, 30 pf load 400 measured at 66.67 mhz, loaded outputs, 15 pf load 400 t lock pll lock time stable power supply, valid clock presented on ref and fbk pins 1.0 ms
nb2308a http://onsemi.com 6 zero delay and skew control all outputs should be uniformly loaded to achieve zero delay between input and output. figure 3. ref input to clka/clkb delay vs. difference in loading between fbk pin and clka/clkb pins 1500 1000 500 0 --500 --1000 --1500 -- 3 0 -- 2 5 -- 2 0 -- 1 5 -- 1 0 -- 5 0 5 1 0 1 5 2 0 2 5 3 0 ref input to clka/clkb dela y (ps) output load difference: fbk load -- clka/clkb load (pf) to close the feedback loop of the nb2308a, the fbk pin can be driven from any of the eight available output pins. the output driving the fbk pin will be driving a total load of 7 pf plus any additional load that it drives. the relative loading of this output (with respect to the remaining outputs) can adjust the input--output delay. this is shown in figure 3. for applications requiring zero input--output delay, all outputs including the one providing feedback should be equally loaded. if input--output delay adjustments are required, use the above graph to calculate loading differences between the feedback output and remaining outputs. for zero output--output skew, be sure to load outputs equally. switching waveforms figure 4. duty cycle timing 1.4 v 1.4 v 1.4 v t 1 t 2 figure 5. all outputs rise/fall time t 3 output 2.0 v 0.8 v t 4 2.0 v 0.8 v 3.3 v 0v 1.4 v 1.4 v t 5 figure 6. output -- output skew output output t 6 input output figure 7. input -- output propagation delay v dd 2 v dd 2 figure 8. device -- device skew t 7 fbk_device 1 v dd 2 v dd 2 fbk_device 2
nb2308a http://onsemi.com 7 test circuits v dd v dd c load gnd gnd outputs figure 9. test circuit #1 10 pf 0.1 m f 0.1 m f v dd v dd gnd gnd outputs 0.1 m f 0.1 m f 1k 1k figure 10. test circuit #2 for parameter t 8 (output slew rate) on --1h devices v dd clkout figure 11. nb2308ai1 and nb2308ai1h figure 12. nb2308ai2 block diagrams fbk clka1 clka2 clka3 clka4 pll mux clkb1 clkb2 clkb3 clkb4 select input decoding r ef s2 s1 fbk clka1 clka2 clka3 clka4 pll clkb1 clkb2 clkb3 clkb4 select input decoding ref s2 s1 2 mux
nb2308a http://onsemi.com 8 figure 13. nb2308ai3 figure 14. nb2308ai4 figure 15. nb2308ai5h block diagrams fbk clka1 clka2 clka3 clka4 pll clkb1 clkb2 clkb3 clkb4 select input decoding r ef s2 s1 2 2 fbk clka1 clka2 clka3 clka4 pll clkb1 clkb2 clkb3 clkb4 select input decoding ref s2 s1 2 fbk clka1 clka2 clka3 clka4 pll clkb1 clkb2 clkb3 clkb4 select input decoding ref s2 s1 2 mux mux mux
nb2308a http://onsemi.com 9 ordering information device marking operating range package shipping ? availability nb2308ai1dg 2308ai1g industrial & commercial soic--16 (pb--free) 48 units / rail now nb2308ai1dr2g 2308ai1g industrial & commercial soic--16 (pb--free) 2500 tape & reel now nb2308ai1hdg 2308ai1hg industrial & commercial soic--16 (pb--free) 48 units / rail now nb2308ai1hdr2g 2308ai1hg industrial & commercial soic--16 (pb--free) 2500 tape & reel now nb2308ai1dtg 2308 ai1 industrial & commercial tssop--16 (pb--free) 96 units / rail now nb2308ai1dtr2g 2308 ai1 industrial & commercial tssop--16 (pb--free) 2500 tape & reel now nb2308ai1hdtg 2308 ai1h industrial & commercial tssop--16 (pb--free) 96 units / rail now nb2308ai1hdtr2g 2308 ai1h industrial & commercial tssop--16 (pb--free) 2500 tape & reel now nb2308ai2dg 2308ai2g industrial & commercial soic--16 (pb--free) 48 units / rail now nb2308ai2dr2g 2308ai2g industrial & commercial soic--16 (pb--free) 2500 tape & reel now nb2308ai2dtg 2308 ai2 industrial & commercial tssop--16 (pb--free) 96 units / rail now nb2308ai2dtr2g 2308 ai2 industrial & commercial tssop--16 (pb--free) 2500 tape & reel now nb2308ai2hdg 2308ai2hg industrial & commercial soic--16 (pb--free) 48 units / rail now nb2308ai2hdr2g 2308ai2hg industrial & commercial soic--16 (pb--free) 2500 tape & reel now nb2308ai2hdtg 2308 ai2h industrial & commercial tssop--16 (pb--free) 96 units / rail now nb2308ai2hdtr2g 2308 ai2h industrial & commercial tssop--16 (pb--free) 2500 tape & reel now nb2308ai3dg 2308ai3g industrial & commercial soic--16 (pb--free) 48 units / rail now nb2308ai3dr2g 2308ai3g industrial & commercial soic--16 (pb--free) 2500 tape & reel now nb2308ai3dtg 2308 ai3 industrial & commercial tssop--16 (pb--free) 96 units / rail now nb2308ai3dtr2g 2308 ai3 industrial & commercial tssop--16 (pb--free) 2500 tape & reel now nb2308ai4dg 2308ai4g industrial & commercial soic--16 (pb--free) 48 units / rail now nb2308ai4dr2g 2308ai4g industrial & commercial soic--16 (pb--free) 2500 tape & reel now nb2308ai4dtg 2308 ai4 industrial & commercial tssop--16 (pb--free) 96 units / rail now nb2308ai4dtr2g 2308 ai4 industrial & commercial tssop--16 (pb--free) 2500 tape & reel now ?for information on tape and reel specificati ons, including part orientation and tape sizes, please refer to our tape and reel packaging spe- cifications brochure, brd8011/d.
nb2308a http://onsemi.com 10 ordering information device availability shipping ? package operating range marking nb2308ai5hdg 2308ai5hg industrial & commercial soic--16 (pb--free) 48 units / rail now nb2308ai5hdr2g 2308ai5hg industrial & commercial soic--16 (pb--free) 2500 tape & reel now nb2308ai5hdtg 2308 ai5h industrial & commercial tssop--16 (pb--free) 96 units / rail now nb2308ai5hdtr2g 2308 ai5h industrial & commercial tssop--16 (pb--free) 2500 tape & reel now ?for information on tape and reel specificati ons, including part orientation and tape sizes, please refer to our tape and reel packaging spe- cifications brochure, brd8011/d.
nb2308a http://onsemi.com 11 package dimensions tssop--16 case 948f--01 issue b dim min max min max inches millimeters a 4.90 5.10 0.193 0.200 b 4.30 4.50 0.169 0.177 c -- -- -- 1 . 2 0 -- -- -- 0 . 0 4 7 d 0.05 0.15 0.002 0.006 f 0.50 0.75 0.020 0.030 g 0.65 bsc 0.026 bsc h 0.18 0.28 0.007 0.011 j 0.09 0.20 0.004 0.008 j1 0.09 0.16 0.004 0.006 k 0.19 0.30 0.007 0.012 k1 0.19 0.25 0.007 0.010 l 6.40 bsc 0.252 bsc m 0808 notes: 1. dimensioning and tolerancing per ansi y14.5m, 1982. 2. controlling dimension: millimeter. 3. dimension a does not include mold flash. protrusions or gate burrs. mold flash or gate burrs shall not exceed 0.15 (0.006) per side. 4. dimension b does not include interlead flash or protrusion. interlead flash or protrusion shall not exceed 0.25 (0.010) per side. 5. dimension k does not include dambar protrusion. allowable dambar protrusion shall be 0.08 (0.003) total in excess of the k dimension at maximum material condition. 6. terminal numbers are shown for reference only. 7. dimension a and b are to be determined at datum plane --w--. ____ section n--n seating plane ident. pin 1 1 8 16 9 detail e j j1 b c d a k k1 h g detail e f m l 2x l/2 -- u -- s u 0.15 (0.006) t s u 0.15 (0.006) t s u m 0.10 (0.004) v s t 0.10 (0.004) -- t -- -- v -- -- w -- 0.25 (0.010) 16x ref k n n 7.06 16x 0.36 16x 1.26 0.65 dimensions: millimeters 1 pitch soldering footprint *for additional information on our pb--free strategy and soldering details, please download the on semiconductor soldering and mounting techniques reference manual, solderrm/d.
nb2308a http://onsemi.com 12 package dimensions soic--16 case 751b--05 issue k notes: 1. dimensioning and tolerancing per ansi y14.5m, 1982. 2. controlling dimension: millimeter. 3. dimensions a and b do not include mold protrusion. 4. maximum mold protrusion 0.15 (0.006) per side. 5. dimension d does not include dambar protrusion. allowable dambar protrusion shall be 0.127 (0.005) total in excess of the d dimension at maximum material condition. 18 16 9 seating plane f j m r x45 _ g 8pl p -- b -- -- a -- m 0.25 (0.010) b s -- t -- d k c 16 pl s b m 0.25 (0.010) a s t dim min max min max inches millimeters a 9.80 10.00 0.386 0.393 b 3.80 4.00 0.150 0.157 c 1.35 1.75 0.054 0.068 d 0.35 0.49 0.014 0.019 f 0.40 1.25 0.016 0.049 g 1.27 bsc 0.050 bsc j 0.19 0.25 0.008 0.009 k 0.10 0.25 0.004 0.009 m 0707 p 5.80 6.20 0.229 0.244 r 0.25 0.50 0.010 0.019 ____ 6.40 16x 0.58 16x 1.12 1.27 dimensions: millimeters 1 pitch soldering footprint 16 89 8x *for additional information on our pb--free strategy and soldering details, please download the on semiconductor soldering and mounting techniques reference manual, solderrm/d. on semiconductor and are registered trademarks of semiconductor components industries, llc (scillc). scillc reserves the right to make changes without further noti ce to any products herein. scillc makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does scillc assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation speci al, consequential or incidental damages. ?typical? parameters which may be provided in scillc data sheets and/or specifications can and do vary in different applications and actual performa nce may vary over time. all operating parameters, including ?typicals? must be validated for each custo mer application by customer?s techni cal experts. scillc does not conve y any license under its patent rights nor the rights of others. scillc products are not designed, intended, or authorized for use as components in systems intended for surgical impl ant into the body, or other applications intended to support or sustain life, or fo r any other application in which the failure of the scillc product could create a situation wher e personal injury or death may occur. should buyer purchase or use scillc products for any such unintended or unaut horized application, buyer shall indemnify and hold scillc and its offic ers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or in directly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such clai m alleges that scillc was negligent regarding the design or manufactur e of the part. scillc is an equal opportunity/affirmative action employer. this literature is subj ect to all applicable c opyright laws and is not for resale in any manner. publication ordering information n. american technical support : 800--282--9855 toll free usa/canada europe, middle east and africa technical support: phone: 421 33 790 2910 japan customer focus center phone: 81--3--5773--3850 nb2308a/d literature fulfillment : literature distribution center for on semiconductor p.o. box 5163, denver, colorado 80217 usa phone : 303--675--2175 or 800--344--3860 toll free usa/canada fax : 303--675--2176 or 800--344--3867 toll free usa/canada email : orderlit@onsemi.com on semiconductor website : www.onsemi.com order literature : http://www.onsemi.com/orderlit for additional information, please contact your loca l sales representative

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