? semiconductor components industries, llc, 2002 february, 2002 rev. 8 1 publication order number: sn74ls157/d sn74ls157 quad 2-input multiplexer the lsttl/msi sn74ls157 is a high speed quad 2-input multiplexer. four bits of data from two sources can be selected using the common select and enable inputs. the four buffered outputs present the selected data in the true (non-inverted) form. the ls157 can also be used to generate any four of the 16 different functions of two variables. the ls157 is fabricated with the schottky barrier diode process for high speed and is completely compatible with all on semiconductor ttl families. ? schottky process for high speed ? multifunction capability ? non-inverting outputs ? input clamp diodes limit high speed termination effects ? special circuitry ensures glitch free multiplexing ? esd > 3500 volts guaranteed operating ranges symbol parameter min typ max unit v cc supply voltage 4.75 5.0 5.25 v t a operating ambient temperature range 0 25 70 c i oh output current high 0.4 ma i ol output current low 8.0 ma low power schottky soic d suffix case 751b plastic n suffix case 648 16 1 16 1 soeiaj m suffix case 966 16 1 device package shipping ordering information sn74ls157n 16 pin dip 2000 units/box sn74ls157d soic16 38 units/rail sn74ls157dr2 soic16 2500/tape & reel sn74ls157m soeiaj16 see note 1 sn74ls157mel soeiaj16 1. for ordering information on the eiaj version of the soic package, please contact your local on semiconductor representative. see note 1 http://onsemi.com
sn74ls157 http://onsemi.com 2 figure 1. connection diagram dip (top view) common select input enable (active low) input data inputs from source 0 data inputs from source 1 multiplexer outputs s e i 0a i 0d i 1a i 1d z a z d 1.0 u.l. 1.0 u.l. 0.5 u.l. 0.5 u.l. 10 u.l. 0.5 u.l. 0.5 u.l. 0.25 u.l. 0.25 u.l. 5 u.l. notes: a) 1 ttl unit load (u.l.) = 40 a high/1.6 ma low. high low (note a) loading pin names v cc = pin 16 gnd = pin 8 note: the flatpak version has the same pinouts (connection diagram) as the dual in-line package. 14 13 12 11 10 9 123456 7 16 15 8 v cc s e i 0c i 1c z c i 1d i 0d zd i 0a i 1a z a i 0b i 1b z b gnd figure 2. logic symbol 15 2 3 5 6 14 13 11 10 1 4 7 12 9 ei 0a i 1a i 0b i 1b i 0c i 1c i 0d i 1d z a z b z c z d s
sn74ls157 http://onsemi.com 3 figure 3. logic diagram 14 1 26 7 3 4 5 9 11 12 10 13 15 v cc = pin 16 gnd = pin 8 = pin numbers functional description the ls157 is a quad 2-input multiplexer fabricated with the schottky barrier diode process for high speed. it selects four bits of data from two sources under the control of a common select input (s). the enable input (e ) is active low. when e is high, all of the outputs (z) are forced low regardless of all other inputs. the ls157 is the logic implementation of a 4-pole, 2-position switch where the position of the switch is determined by the logic levels supplied to the select input. the logic equations for the outputs are: z a = e ? (i 1a ? s + i 0a ? s ) z b = e ? (i 1b ? s + i 0b ? s ) z c = e ? (i 1c ? s + i 0c ? s )z d = e ? (i 1d ? s + i 0d ? s ) a common use of the ls157 is the moving of data from two groups of registers to four common output busses. the particular register from which the data comes is determined by the state of the select input. a less obvious use is as a function generator. the ls157 can generate any four of the 16 different functions of two variables with one variable common. this is useful for implementing highly irregular logic. truth table enable select input inputs output e s i 0 i 1 z h x x x l l h x ll l h x hh l l l xl l l h x h h = high voltage level l = low voltage level x = don't care
sn74ls157 http://onsemi.com 4 dc characteristics over operating temperature range (unless otherwise specified) limits symbol parameter min typ max unit test conditions v ih input high voltage 2.0 v guaranteed input high voltage for all inputs v il input low voltage 0.8 v guaranteed input low voltage for all inputs v ik input clamp diode voltage 0.65 1.5 v v cc = min, i in = 18 ma v oh output high voltage 2.7 3.5 v v cc = min, i oh = max, v in = v ih or v il per truth table v out p ut low voltage 0.25 0.4 v i ol = 4.0 ma v cc = v cc min, v v or v v ol output low voltage 0.35 0.5 v i ol = 8.0 ma v in = v il or v ih per truth table i ih input high current i 0 , i 1 e , s 20 40 m a v cc = max, v in = 2.7 v i ih i 0 , i 1 e , s 0.1 0.2 ma v cc = max, v in = 7.0 v i il input low current i 0 , i 1 e , s 0.4 0.8 ma v cc = max, v in = 0.4 v i os short circuit current (note 2) 20 100 ma v cc = max i cc power supply current 16 ma v cc = max 2. not more than one output should be shorted at a time, nor for more than 1 second. ac characteristics (t a = 25 c) limits symbol parameter min typ max unit test conditions t plh t phl propagation delay data to output 9.0 9.0 14 14 ns figure 2 t plh t phl propagation delay enable to output 13 14 20 21 ns figure 1 v cc = 5.0 v c l = 15 pf t plh t phl propagation delay select to output 15 18 23 27 ns figure 2 l ac waveforms figure 1. figure 2. v in v out 1.3 v t phl 1.3 v t plh 1.3 v 1.3 v v in v out 1.3 v t phl 1.3 v t plh 1.3 v 1.3 v
sn74ls157 http://onsemi.com 5 package dimensions n suffix plastic package case 64808 issue r notes: 1. dimensioning and tolerancing per ansi y14.5m, 1982. 2. controlling dimension: inch. 3. dimension l to center of leads when formed parallel. 4. dimension b does not include mold flash. 5. rounded corners optional. a b f c s h g d j l m 16 pl seating 18 9 16 k plane t m a m 0.25 (0.010) t dim min max min max millimeters inches a 0.740 0.770 18.80 19.55 b 0.250 0.270 6.35 6.85 c 0.145 0.175 3.69 4.44 d 0.015 0.021 0.39 0.53 f 0.040 0.70 1.02 1.77 g 0.100 bsc 2.54 bsc h 0.050 bsc 1.27 bsc j 0.008 0.015 0.21 0.38 k 0.110 0.130 2.80 3.30 l 0.295 0.305 7.50 7.74 m 0 10 0 10 s 0.020 0.040 0.51 1.01
sn74ls157 http://onsemi.com 6 package dimensions d suffix plastic soic package case 751b05 issue j 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
sn74ls157 http://onsemi.com 7 package dimensions h e a 1 dim min max min max inches --- 2.05 --- 0.081 millimeters 0.05 0.20 0.002 0.008 0.35 0.50 0.014 0.020 0.18 0.27 0.007 0.011 9.90 10.50 0.390 0.413 5.10 5.45 0.201 0.215 1.27 bsc 0.050 bsc 7.40 8.20 0.291 0.323 0.50 0.85 0.020 0.033 1.10 1.50 0.043 0.059 0 0.70 0.90 0.028 0.035 --- 0.78 --- 0.031 a 1 h e q 1 l e 10 0 10 l e q 1 notes: 1. dimensioning and tolerancing per ansi y14.5m, 1982. 2. controlling dimension: millimeter. 3. dimensions d and e do not include mold flash or protrusions and are measured at the parting line. mold flash or protrusions shall not exceed 0.15 (0.006) per side. 4. terminal numbers are shown for reference only. 5. the lead width dimension (b) does not include dambar protrusion. allowable dambar protrusion shall be 0.08 (0.003) total in excess of the lead width dimension at maximum material condition. dambar cannot be located on the lower radius or the foot. minimum space between protrusions and adjacent lead to be 0.46 ( 0.018). m l detail p view p c a b e m 0.13 (0.005) 0.10 (0.004) 1 16 9 8 d z e a b c d e e l m z m suffix soeiaj package case 96601 issue o
sn74ls157 http://onsemi.com 8 on semiconductor and are trademarks of semiconductor components industries, llc (scillc). scillc reserves the right to make changes without further notice 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 special, consequential or incidental damages. atypicalo parameters which may be provided in scill c data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. all operating parameters, including atypicalso 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 officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthori zed 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. publication ordering information japan : on semiconductor, japan customer focus center 4321 nishigotanda, shinagawaku, tokyo, japan 1410031 phone : 81357402700 email : r14525@onsemi.com on semiconductor website : http://onsemi.com for additional information, please contact your local sales representative. sn74ls157/d literature fulfillment : literature distribution center for on semiconductor p.o. box 5163, denver, colorado 80217 usa phone : 3036752175 or 8003443860 toll free usa/canada fax : 3036752176 or 8003443867 toll free usa/canada email : onlit@hibbertco.com n. american technical support : 8002829855 toll free usa/canada
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