SN74LVC157A quadruple 2-line to 1-line data selector/multiplexer scas292g january 1993 revised october 1998 1 post office box 655303 ? dallas, texas 75265 epic ? (enhanced-performance implanted cmos) submicron process typical v olp (output ground bounce) < 0.8 v at v cc = 3.3 v, t a = 25 c typical v ohv (output v oh undershoot) > 2 v at v cc = 3.3 v, t a = 25 c inputs accept voltages to 5.5 v esd protection exceeds 2000 v per mil-std-883, method 3015; exceeds 200 v using machine model (c = 200 pf, r = 0) latch-up performance exceeds 250 ma per jesd 17 package options include plastic small-outline (d), shrink small-outline (db), and thin shrink small-outline (pw) packages description this quadruple 2-line to 1-line data selector/multiplexer is designed for 1.65-v to 3.6-v v cc operation. the SN74LVC157A features a common strobe (g ) input. when the strobe is high, all outputs are low. when the strobe is low, a 4-bit word is selected from one of two sources and is routed to the four outputs. the device provides true data. inputs can be driven from either 3.3-v or 5-v devices. this feature allows the use of these devices as translators in a mixed 3.3-v/5-v system environment. the SN74LVC157A is characterized for operation from 40 c to 85 c. function table inputs output g a /b a b y h x x x l l llx l l lhx h l hxl l l h x h h copyright ? 1998, texas instruments incorporated production data information is current as of publication date. products conform to specifications per the terms of texas instruments standard warranty. production processing does not necessarily include testing of all parameters. please be aware that an important notice concerning availability, standard warranty, and use in critical applications of texas instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. epic is a trademark of texas instruments incorporated. 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 a /b 1a 1b 1y 2a 2b 2y gnd v cc g 4a 4b 4y 3a 3b 3y d, db, or pw package (top view)
SN74LVC157A quadruple 2-line to 1-line data selector/multiplexer scas292g january 1993 revised october 1998 2 post office box 655303 ? dallas, texas 75265 logic symbol 2 2 1a 1 3 1b 5 2a 6 2b 11 3a 10 3b 14 4a 13 4b en 15 g1 1 mux 1 1y 4 2y 7 3y 9 4y 12 g a /b 2 this symbol is in accordance with ansi/ieee std 91-1984 and iec publication 617-12. logic diagram (positive logic) 2 3 5 6 11 10 14 13 15 1 g a /b 4b 4a 3b 3a 2b 2a 1b 1a 4 7 9 12 1y 2y 3y 4y
SN74LVC157A quadruple 2-line to 1-line data selector/multiplexer scas292g january 1993 revised october 1998 3 post office box 655303 ? dallas, texas 75265 absolute maximum ratings over operating free-air temperature range (unless otherwise noted) 2 supply voltage range, v cc 0.5 v to 6.5 v . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . input voltage range, v i (see note 1) 0.5 v to 6.5 v . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . output voltage range, v o (see notes 1 and 2) 0.5 v to v cc + 0.5 v . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . input clamp current, i ik (v i < 0) 50 ma . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . output clamp current, i ok (v o < 0) 50 ma . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . continuous output current, i o 50 ma . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . continuous current through v cc or gnd 100 ma . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . package thermal impedance, q ja (see note 3): d package 113 c/w . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . db package 131 c/w . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . pw package 149 c/w . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . storage temperature range, t stg 65 c to 150 c . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 stresses beyond those listed under aabsolute maximum ratingso may cause permanent damage to the device. these are stress rating s only, and functional operation of the device at these or any other conditions beyond those indicated under arecommended operating conditi onso is not implied. exposure to absolute-maximum-rated conditions for extended periods may affect device reliability. notes: 1. the input negative-voltage and output voltage ratings may be exceeded if the input and output current ratings are obser ved. 2. the value of v cc is provided in the recommended operating conditions table. 3. the package thermal impedance is calculated in accordance with jesd 51. recommended operating conditions (see note 4) min max unit v cc su pp ly voltage operating 1.65 3.6 v v cc s u ppl y v oltage data retention only 1.5 v v cc = 1.65 v to 1.95 v 0.65 v cc v ih high-level input voltage v cc = 2.3 v to 2.7 v 1.7 v v cc = 2.7 v to 3.6 v 2 v cc = 1.65 v to 1.95 v 0.35 v cc v il low-level input voltage v cc = 2.3 v to 2.7 v 0.7 v v cc = 2.7 v to 3.6 v 0.8 v i input voltage 0 5.5 v v o output voltage 0 v cc v v cc = 1.65 v 4 i oh high level out p ut current v cc = 2.3 v 8 ma i oh high - le v el o u tp u t c u rrent v cc = 2.7 v 12 ma v cc = 3 v 24 v cc = 1.65 v 4 i ol low level out p ut current v cc = 2.3 v 8 ma i ol lo w- le v el o u tp u t c u rrent v cc = 2.7 v 12 ma v cc = 3 v 24 d t/ d v input transition rise or fall rate 0 10 ns/v t a operating free-air temperature 40 85 c note 4: all unused inputs of the device must be held at v cc or gnd to ensure proper device operation. refer to the ti application report, implications of slow or floating cmos inputs , literature number scba004.
SN74LVC157A quadruple 2-line to 1-line data selector/multiplexer scas292g january 1993 revised october 1998 4 post office box 655303 ? dallas, texas 75265 electrical characteristics over recommended operating free-air temperature range (unless otherwise noted) parameter test conditions v cc min typ 2 max unit i oh = 100 m a 1.65 v to 3.6 v v cc 0.2 i oh = 4 ma 1.65 v 1.2 v oh i oh = 8 ma 2.3 v 1.7 v v oh i oh =12ma 2.7 v 2.2 v i oh = 12 ma 3 v 2.4 i oh = 24 ma 3 v 2.2 i ol = 100 m a 1.65 v to 3.6 v 0.2 i ol = 4 ma 1.65 v 0.45 v ol i ol = 8 ma 2.3 v 0.7 v i ol = 12 ma 2.7 v 0.4 i ol = 24 ma 3 v 0.55 i i v i = 5.5 v or gnd 3.6 v 5 m a i cc v i = v cc or gnd, i o = 0 3.6 v 10 m a d i cc one input at v cc 0.6 v, other inputs at v cc or gnd 2.7 v to 3.6 v 500 m a c i v i = v cc or gnd 3.3 v 5 pf 2 all typical values are at v cc = 3.3 v, t a = 25 c. switching characteristics over recommended operating free-air temperature range (unless otherwise noted) (see figures 1 through 3) parameter from (input) to (output) v cc = 1.8 v v cc = 2.5 v 0.2 v v cc = 2.7 v v cc = 3.3 v 0.3 v unit (input) (output) typ min max min max min max a or b 13.9 1 7.9 5.9 1 5.2 t pd a /b y 16.1 1 10.1 8.1 1 6.8 ns g 15.8 1 9.8 7.8 1 6.5 t sk(o) 3 1 ns 3 skew between any two outputs of the same package switching in the same direction operating characteristics, t a = 25 c parameter test v cc = 1.8 v v cc = 2.5 v v cc = 3.3 v unit parameter conditions typ typ typ unit c pd power dissipation capacitance f = 10 mhz 14 15 16 pf
SN74LVC157A quadruple 2-line to 1-line data selector/multiplexer scas292g january 1993 revised october 1998 5 post office box 655303 ? dallas, texas 75265 parameter measurement information v cc = 1.8 v 0.15 v v cc /2 v cc /2 v cc /2 v cc /2 v cc /2 v cc /2 v cc /2 v cc /2 v oh v ol t h t su from output under test c l = 30 pf (see note a) load circuit s1 open gnd 1 k w 1 k w output control (low-level enabling) output waveform 1 s1 at 2 v cc (see note b) output waveform 2 s1 at open (see note b) t pzl t pzh t plz t phz 0 v v ol + 0.15 v v oh 0.15 v 0 v v cc 0 v 0 v t w v cc v cc voltage waveforms setup and hold times voltage waveforms pulse duration voltage waveforms enable and disable times timing input data input input t pd t plz /t pzl t phz /t pzh open 2 v cc open test s1 notes: a. c l includes probe and jig capacitance. b. waveform 1 is for an output with internal conditions such that the output is low except when disabled by the output control. waveform 2 is for an output with internal conditions such that the output is high except when disabled by the output control. c. all input pulses are supplied by generators having the following characteristics: prr 10 mhz, z o = 50 w , t r 2 ns, t f 2 ns. d. the outputs are measured one at a time with one transition per measurement. e. t plz and t phz are the same as t dis . f. t pzl and t pzh are the same as t en . g. t plh and t phl are the same as t pd . 0 v v cc v cc /2 t phl v cc /2 v cc /2 v cc 0 v v oh v ol input output voltage waveforms propagation delay times v cc /2 v cc /2 t plh 2 v cc v cc figure 1. load circuit and voltage waveforms
SN74LVC157A quadruple 2-line to 1-line data selector/multiplexer scas292g january 1993 revised october 1998 6 post office box 655303 ? dallas, texas 75265 parameter measurement information v cc = 2.5 v 0.2 v v cc /2 v cc /2 v cc /2 v cc /2 v cc /2 v cc /2 v cc /2 v cc /2 v oh v ol t h t su from output under test c l = 30 pf (see note a) load circuit s1 open gnd 500 w 500 w output control (low-level enabling) output waveform 1 s1 at 2 v cc (see note b) output waveform 2 s1 at gnd (see note b) t pzl t pzh t plz t phz 0 v v ol + 0.15 v v oh 0.15 v 0 v v cc 0 v 0 v t w v cc v cc voltage waveforms setup and hold times voltage waveforms pulse duration voltage waveforms enable and disable times timing input data input input t pd t plz /t pzl t phz /t pzh open 2 v cc gnd test s1 notes: a. c l includes probe and jig capacitance. b. waveform 1 is for an output with internal conditions such that the output is low except when disabled by the output control. waveform 2 is for an output with internal conditions such that the output is high except when disabled by the output control. c. all input pulses are supplied by generators having the following characteristics: prr 10 mhz, z o = 50 w , t r 2 ns, t f 2 ns. d. the outputs are measured one at a time with one transition per measurement. e. t plz and t phz are the same as t dis . f. t pzl and t pzh are the same as t en . g. t plh and t phl are the same as t pd . 0 v v cc v cc /2 t phl v cc /2 v cc /2 v cc 0 v v oh v ol input output voltage waveforms propagation delay times v cc /2 v cc /2 t plh 2 v cc v cc figure 2. load circuit and voltage waveforms
SN74LVC157A quadruple 2-line to 1-line data selector/multiplexer scas292g january 1993 revised october 1998 7 post office box 655303 ? dallas, texas 75265 parameter measurement information v cc = 2.7 v and 3.3 v 0.3 v v oh v ol t h t su from output under test c l = 50 pf (see note a) load circuit s1 6 v open gnd 500 w 500 w t plh t phl output control (low-level enabling) output waveform 1 s1 at 6 v (see note b) output waveform 2 s1 at gnd (see note b) t pzl t pzh t plz t phz 1.5 v 1.5 v 1.5 v 1.5 v 2.7 v 0 v 1.5 v 1.5 v v oh v ol 0 v 1.5 v v ol + 0.3 v 1.5 v v oh 0.3 v 0 v 1.5 v 2.7 v 0 v 1.5 v 1.5 v 0 v 2.7 v 0 v 1.5 v 1.5 v t w input 2.7 v 2.7 v 3 v voltage waveforms setup and hold times voltage waveforms propagation delay times voltage waveforms pulse duration voltage waveforms enable and disable times timing input data input output input t pd t plz /t pzl t phz /t pzh open 6 v gnd test s1 notes: a. c l includes probe and jig capacitance. b. waveform 1 is for an output with internal conditions such that the output is low except when disabled by the output control. waveform 2 is for an output with internal conditions such that the output is high except when disabled by the output control. c. all input pulses are supplied by generators having the following characteristics: prr 10 mhz, z o = 50 w , t r 2.5 ns, t f 2.5 ns. d. the outputs are measured one at a time with one transition per measurement. e. t plz and t phz are the same as t dis . f. t pzl and t pzh are the same as t en . g. t plh and t phl are the same as t pd . figure 3. load circuit and voltage waveforms
important notice texas instruments and its subsidiaries (ti) reserve the right to make changes to their products or to discontinue any product or service without notice, and advise customers to obtain the latest version of relevant information to verify, before placing orders, that information being relied on is current and complete. all products are sold subject to the terms and conditions of sale supplied at the time of order acknowledgement, including those pertaining to warranty, patent infringement, and limitation of liability. ti warrants performance of its semiconductor products to the specifications applicable at the time of sale in accordance with ti's standard warranty. testing and other quality control techniques are utilized to the extent ti deems necessary to support this warranty. specific testing of all parameters of each device is not necessarily performed, except those mandated by government requirements. certain applications using semiconductor products may involve potential risks of death, personal injury, or severe property or environmental damage (acritical applicationso). ti semiconductor products are not designed, authorized, or warranted to be suitable for use in life-support devices or systems or other critical applications. inclusion of ti products in such applications is understood to be fully at the customer's risk. in order to minimize risks associated with the customer's applications, adequate design and operating safeguards must be provided by the customer to minimize inherent or procedural hazards. ti assumes no liability for applications assistance or customer product design. ti does not warrant or represent that any license, either express or implied, is granted under any patent right, copyright, mask work right, or other intellectual property right of ti covering or relating to any combination, machine, or process in which such semiconductor products or services might be or are used. ti's publication of information regarding any third party's products or services does not constitute ti's approval, warranty or endorsement thereof. copyright ? 1998, texas instruments incorporated
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