? semiconductor components industries, llc, 2010 january, 2010 ? rev. 0 1 publication order number: MC74HC251A/d MC74HC251A 8-input data selector/ multiplexer with 3-state outputs high ? performance silicon ? gate cmos the mc54/74hc251 is identical in pinout to the ls251. the device inputs are compatible with standard cmos outputs; with pullup resistors, they are compatible with lsttl outputs. this device selects one of the eight binary data inputs, as determined by the address inputs. the output enable pin must be a low level for the selected data to appear at the outputs. if output enable is high, both the y and the y outputs are in the high ? impedance state. this 3 ? state feature allows the hc251 to be used in bus ? oriented systems. the hc251 is similar in function to the hc251 which does not have 3 ? state outputs. features ? output drive capability: 10 lsttl loads ? outputs directly interface to cmos, nmos, and ttl ? operating voltage range: 2 to 6 v ? low input current: 1 a ? high noise immunity characteristic of cmos devices ? these are pb ? free devices http://onsemi.com marking diagrams soic ? 16 d suffix case 751b tssop ? 16 dt suffix case 948f 1 16 1 16 hc251ag awlyww hc 251a alyw 1 16 a = assembly location wl, l = wafer lot yy, y = year ww, w = work week g or = pb ? free package see detailed ordering and shipping information in the package dimensions section on p age 6 of this data sheet. ordering information (note: microdot may be in either location) pin assignment 1 16 13 14 15 16 9 10 11 12 5 4 3 2 1 8 7 6 d7 d6 d5 d4 v cc a2 a1 a0 d0 d1 d2 d3 gnd output enable y y
MC74HC251A http://onsemi.com 2 figure 1. logic diagram d0 d1 d2 d3 d4 d5 d6 d7 a0 a1 a2 output enable y y data outputs data inputs address inputs 5 6 4 3 2 1 15 14 13 12 11 10 9 7 pin 16 = v cc pin 8 = gnd function table inputs outputs a2 a1 a0 output enabled y y x l l l l h h h h x l l h h l l h h x l h l h l h l h h l l l l l l l l z d0 d1 d2 d3 d4 d5 d6 d7 z d0 d1 d2 d3 d4 d5 d6 d7 z = high impedance d0, d1, , d7 = the level of the respective d input. maximum ratings symbol parameter value unit v cc dc supply voltage (referenced to gnd) ? 0.5 to + 7.0 v v in dc input voltage (referenced to gnd) ? 1.5 to v cc + 1.5 v v out dc output voltage (referenced to gnd) ? 0.5 to v cc + 0.5 v i in dc input current, per pin 25 ma i out dc output current, per pin 50 ma i cc dc supply current, v cc and gnd pins 75 ma p d power dissipation in still air soic package tssop package 500 tbd mw t stg storage temperature ? 65 to + 150 c stresses exceeding maximum ratings may damage the device. maximum ratings are stress ratings only. functional operation above the recommended operating conditions is not implied. extended exposure to stresses above the recommended operating conditions may af fect device reliability. recommended operating conditions symbol parameter min max unit v cc dc supply voltage (referenced to gnd) 2.0 6.0 v v in , v out dc input voltage, output voltage (referenced to gnd) 0 v cc v t a operating temperature, all package types ? 55 +125 c t r , t f input rise and fall time v cc = 2.0 v (figure 2) v cc = 4.5 v v cc = 6.0 v 0 0 0 1000 500 400 ns this device contains protection circuitry to guard against damage due to high static voltages or electric fields. however, precautions must be taken to avoid applications of any voltage higher than maximum rated voltages to this high ? impedance cir- cuit. for proper operation, v in and v out should be constrained to the range gnd (v in or v out ) v cc . unused inputs must always be tied to an appropriate logic voltage level (e.g., either gnd or v cc ). unused outputs must be left open.
MC74HC251A http://onsemi.com 3 dc electrical characteristics (voltages referenced to gnd) symbol parameter test conditions v cc v guaranteed limit unit ? 55 to 25 c 85 c 125 c v ih minimum high ? level input voltage v out = 0.1 v or v cc ? 0.1 v |i out | 20 a 2.0 4.5 6.0 1.5 3.15 4.2 1.5 3.15 4.2 1.5 3.15 4.2 v v il maximum low ? level input voltage v out = 0.1 v or v cc ? 0.1 v |i out | 20 a 2.0 4.5 6.0 0.3 0.9 1.2 0.3 0.9 1.2 0.3 0.9 1.2 v v oh minimum high ? level output voltage v in = v ih or v il |i out | 20 a 2.0 4.5 6.0 1.9 4.4 5.9 1.9 4.4 5.9 1.9 4.4 5.9 v v in = v ih or v il |i out | 4.0 ma |i out | 5.2 ma 4.5 6.0 3.98 5.48 3.84 5.34 3.70 5.20 v ol maximum low ? level output voltage v in = v ih or v il |i out | 20 a 2.0 4.5 6.0 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 v v in = v ih or v il |i out | 4.0 ma |i out | 5.2 ma 4.5 6.0 0.26 0.26 0.33 0.33 0.40 0.40 i in maximum input leakage current v in = v cc or gnd 6.0 0.1 1.0 1.0 a i oz maximum three ? state leakage current output in high ? impedance state v in = v il or v ih v out = v cc or gnd 6.0 0.5 5.0 10 a i cc maximum quiescent supply current (per package) v in = v cc or gnd i out = 0 a 6.0 8 80 160 a
MC74HC251A http://onsemi.com 4 ac electrical characteristics (c l = 50 pf, input t r = t f = 6 ns) symbol parameter v cc v guaranteed limit unit ? 55 to 25 c 85 c 125 c t plh , t phl maximum propagation delay, input d to output y or y (figures 2, 3 and 6) 2.0 4.5 6.0 185 37 31 230 46 39 280 56 48 ns t plh , t phl maximum propagation delay, input a to output y or y (figures 3 and 6) 2.0 4.5 6.0 205 41 35 255 51 43 310 62 53 ns t plz , t phz maximum propagation delay, output enable to output y (figures 5 and 7) 2.0 4.5 6.0 195 39 33 245 49 42 295 59 50 ns t pzl , t pzh maximum propagation delay, output enable to output y (figures 5 and 7) 2.0 4.5 6.0 145 29 25 180 36 31 220 44 38 ns t plz , t phz maximum propagation delay, output enable to output y (figures 5 and 7) 2.0 4.5 6.0 220 44 37 275 55 47 330 66 56 ns t pzl , t pzh maximum propagation delay, output enable to output y (figures 5 and 7) 2.0 4.5 6.0 150 30 26 190 38 33 225 45 38 ns t tlh , t thl maximum output transition time, any output (figures 2 and 6) 2.0 4.5 6.0 75 15 13 95 19 16 110 22 19 ns c in maximum input capacitance ? 10 10 10 pf c out maximum three ? state output capacitance (output in high ? impedance state) ? 15 15 15 pf c pd power dissipation capacitance (per package) typical @ 25 c, v cc = 5.0 v pf 36 pin descriptions inputs d0, d1, , d7 (pins 4, 3, 2, 1, 15, 14, 13, 12) data inputs. data on one of these eight binary inputs may be selected to appear on the output. control inputs a0, a1, a2 (pins 11, 10, 9) address inputs. the data on these pins are the binary address of the selected input (see the function table). output enable (pin 7) output enable. this input pin must be at a low level for the selected data to appear at the outputs. if the output enable pin is high, both the y and y outputs are taken to the high ? impedance state. outputs y, y (pins 5, 6) data outputs. the selected data is presented at these pins in both true (y output) and complemented (y output) forms.
MC74HC251A http://onsemi.com 5 switching waveforms figure 2. figure 3. figure 4. v cc gnd t f t r input d output y 10% 50% 90% 10% 50% 90% t tlh t plh t phl t thl t r t f v cc gnd input d output y t phl t plh t tlh t thl 10% 50% 90% 10% 50% 90% v cc gnd 50% input a t plh t phl 50% output y or y figure 5. valid valid output enable y or y y or y 50% 50% 50% 90% 10% t pzl t plz t pzh t phz v cc gnd high impedance v ol v oh high impedance test circuits *includes all probe and jig capacitance c l * test point device under test output figure 6. *includes all probe and jig capacitance c l * test point device under test output figure 7. connect to v cc when testing t plz and t pzl . connect to gnd when testing t phz and t pzh . 1 k
MC74HC251A http://onsemi.com 6 y y 5 6 d0 d1 d2 d3 d4 d5 d6 d7 a b c 4 3 2 1 15 14 13 12 11 10 9 7 data inputs figure 8. expanded logic diagram data outputs output enable ordering information device package shipping ? MC74HC251Adg soic ? 16 (pb ? free) 48 units / rail MC74HC251Adr2g soic ? 16 (pb ? free) 2500 tape & reel MC74HC251Adtr2g tssop ? 16* 2500 tape & reel ?for information on tape and reel specifications, including part orientation and tape sizes, please refer to our tape and reel packaging specifications brochure, brd8011/d. *this package is inherently pb ? free.
MC74HC251A http://onsemi.com 7 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 x 45 g 8 pl 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 0 7 0 7 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.
MC74HC251A http://onsemi.com 8 package dimensions tssop ? 16 dt suffix 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 ??? 1.20 ??? 0.047 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 0 8 0 8 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 ? 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.
MC74HC251A http://onsemi.com 9 on semiconductor and are registered trademarks of semiconductor components industries, llc (scillc). scillc reserves the right to mak e changes without further notice to any products herein. scillc makes no warranty, representation or guarantee regarding the suitability of its products for an y 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 wi thout limitation special, consequential or incidental damages. ?typical? parameters which may be provided in scillc data sheets and/or specifications can and do vary in different application s and actual performance may vary over time. all operating parameters, including ?typicals? must be validated for each customer application by customer?s technical experts. scillc does not convey 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 implant into the body, or other applications intended to support or sustain life, or for any other application in which the failure of the scillc product could create a sit uation where personal injury or death may occur. should buyer purchase or use scillc products for any such unintended or unauthorized application, buyer shall indemnify and hold scillc and its of ficers, employees, subsidiaries, af filiates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, direct ly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that scillc was negligent regarding the design or manufacture of the part. scillc is an equal opportunity/affirmative action employer. this literature is subject to all applicable copyright laws and is not for resale in any manner. MC74HC251A/d 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 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 local sales representative
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