? semiconductor components industries, llc, 2001 september, 2001 rev. 4 1 publication order number: mc74lcx138/d mc74lcx138 low-voltage cmos 3-to-8 decoder/demultiplexer with 5 vtolerant inputs the mc74lcx138 is a high performance, 3to8 decoder/demultiplexer operating from a 2.3 to 3.6 v supply. high impedance ttl compatible inputs significantly reduce current loading to input drivers while ttl compatible outputs offer improved switching noise performance. a v i specification of 5.5 v allows mc74lcx138 inputs to be safely driven from 5 v devices. the mc74lcx138 is suitable for memory address decoding and other ttl level busoriented applications. the mc74lcx138 highspeed 3to8 decoder/demultiplexer accepts three binary weighted inputs (a0, a1, a2) and, when enabled, provides eight mutually exclusive activelow outputs (o0 o7 ). the lcx138 features three enable inputs, two activelow (e1 , e2 ) and one activehigh (e3). all outputs will be high unless e1 and e2 are low, and e3 is high. this multiple enabled function allows easy parallel expansion of the device to a 1of32 (5 lines to 32 lines) decoder with just four lcx138 devices and one inverter (see figure 1). the lcx138 can be used as an 8output demultiplexer by using one of the activelow enable inputs as the data input and the other enable inputs as strobes. the enable inputs which are not used must be permanently tied to their appropriate activehigh or activelow state. current drive capability is 24 ma at the outputs. ? designed for 2.3 v to 3.6 v v cc operation ? 5 v tolerant inputs interface capability with 5 v ttl logic ? lvttl compatible ? lvcmos compatible ? 24 ma balanced output sink and source capability ? near zero static supply current (10 m a) substantially reduces system power requirements ? latchup performance exceeds 500 ma ? esd performance: human body model >2000 v; machine model >200 v http://onsemi.com device package shipping ordering information mc74lcx138d so16 48 units/rail mc74lcx138dr2 so16 mc74lcx138dt tssop16 2500 units/reel 96 untis/rail marking diagrams a = assembly location l, wl = wafer lot y = year w, ww = work week mc74lcx138dtr2 tssop16 2500 units/reel mc74lcx138m eiaj so16 48 units/rail mc74lcx138mel eiaj so16 2000 units/reel so16 d suffix case 751b lcx138 awlyww lcx 138 alyw tssop16 dt suffix case 948f eiaj so16 m suffix case 966 74lcx138 alyw 16 1 16 16 1 1 16 1 16 1 16 1
mc74lcx138 http://onsemi.com 2 figure 1. pinout: 16lead (top view) figure 2. logic diagram 15 16 14 13 12 11 10 2 1 34567 v cc o0 o1 o2 o3 o4 o5 a0 a1 a2 e1 e2 e3 o7 8 gnd 9 o6 o7 o6 o5 o4 o3 o2 o1 o0 a2 a1 a0 e1 e2 e3 6 5 4 1 2 3 791 0 1 1 12 13 1 4 1 5 pin names pins function a0 a2 address inputs e1e2 enable inputs e3 enable input o0o7 outputs truth table inputs outputs e1 e2 e3 a0 a1 a2 o0 o1 o2 o3 o4 o5 o6 o7 h x x x x x h h h h h h h h x h x x x x h h h h h h h h x x l x x x h h h h h h h h l l h l l l l h h h h h h h l l h h l l h l h h h h h h l l h l h l h h l h h h h h l l h h h l h h h l h h h h l l h l l h h h h h l h h h l l h h l h h h h h h l h h l l h l h h h h h h h h l h l l h h h h h h h h h h h l h = high voltage level l = low voltage level x = high or low voltage level and transitions are acceptable for i cc reasons, do not float inputs
mc74lcx138 http://onsemi.com 3 figure 3. expansion to 1of32 decoding o0 o0 o1 o2 o3 o4 o5 o6 o7 a0 a1 a2 e o0 o1 o2 o3 o4 o5 o6 o7 a0 a1 a2 e o0 o1 o2 o3 o4 o5 o6 o7 a0 a1 a2 e o31 o0 o1 o2 o3 o4 o5 o6 o7 a0 a1 a2 e h a4 a3 a2 a1 a0 `04 123 123 123 123 maximum ratings symbol parameter value condition unit v cc dc supply voltage 0.5 to +7.0 v v i dc input voltage 0.5 v i +7.0 v v o dc output voltage 0.5 v o v cc + 0.5 output in high or low state (note 1.) v i ik dc input diode current 50 v i < gnd ma i ok dc output diode current 50 v o < gnd ma +50 v o > v cc ma i o dc output source/sink current 50 ma i cc dc supply current per supply pin 100 ma i gnd dc ground current per ground pin 100 ma t stg storage temperature range 65 to +150 c maximum ratings are those values beyond which damage to the device may occur. exposure to these conditions or conditions beyond those indicated may adversely affect device reliability. functional operation under absolute maximumrated conditions is not implied. functional operation should be restricted to the recommended operating conditions. 1. i o absolute maximum rating must be observed. recommended operating conditions symbol parameter min typ max unit v cc supply voltage operating data retention only 2.0 1.5 2.5, 3.3 2.5, 3.3 3.6 3.6 v v i input voltage 0 5.5 v v o output voltage (high or low state) (3state) 0 v cc v i oh high level output current v cc = 3.0 v 3.6 v v cc = 2.7 v 3.0 v v cc = 2.3 v 2.7 v 24 12 8 ma i ol low level output voltage v cc = 3.0 v 3.6 v v cc = 2.7 v 3.0 v v cc = 2.3 v 2.7 v +24 +12 +8 ma t a operating freeair temperature 40 +85 c d t/ d v input transition rise or fall rate, v in from 0.8 v to 2.0 v, v cc = 3.0 v 0 10 ns/v
mc74lcx138 http://onsemi.com 4 dc electrical characteristics t a = 40 c to +85 c symbol characteristic condition min max unit v ih high level input voltage (note 2.) 2.3 v v cc 2.7 v 1.7 v 2.7 v v cc 3.6 v 2.0 v il low level input voltage (note 2.) 2.3 v v cc 2.7 v 0.7 v 2.7 v v cc 3.6 v 0.8 v oh high level output voltage 2.3 v v cc 3.6 v; i oh = 100 m a v cc 0.2 v v cc = 2.3 v; i oh = 8 ma 1.8 v cc = 2.7 v; i oh = 12 ma 2.2 v cc = 3.0 v; i oh = 18 ma 2.4 v cc = 3.0 v; i oh = 24 ma 2.2 v ol low level output voltage 2.3 v v cc 3.6 v; i ol = 100 m a 0.2 v v cc = 2.3 v; i ol = 8 ma 0.6 v cc = 2.7 v; i ol = 12 ma 0.4 v cc = 3.0 v; i ol = 16 ma 0.4 v cc = 3.0 v; i ol = 24 ma 0.55 i i input leakage current 2.3 v v cc 3.6 v; 0 v v i 5.5 v 5 m a i cc quiescent supply current 2.3 v cc 3.6 v; v i = gnd or v cc 10 m a 2.3 v cc 3.6 v; 3.6 v i or v o 5.5 v 10 d i cc increase in i cc per input 2.3 v cc 3.6 v; v ih = v cc 0.6 v 500 m a 2. these values of v i are used to test dc electrical characteristics only. ac characteristics t r = t f = 2.5 ns; r l = 500 w limits t a = 40 c to +85 c v cc = 3.3 v 0.3 v v cc = 2.7 v v cc = 2.5 v 0.2 v c l = 50 pf c l = 50 pf c l = 30 pf symbol parameter waveform min max min max min max unit t plh propagation delay 1, 2 1.5 6.0 1.5 7.0 1.5 7.2 ns t phl an to on 1.5 6.0 1.5 7.0 1.5 7.2 t plh propagation delay 2 1.5 6.5 1.5 7.5 1.5 8.4 ns t phl e1, e2 to on 1.5 6.5 1.5 7.5 1.5 8.4 t plh propagation delay 1 1.5 6.0 1.5 7.0 1.5 7.2 ns t phl e3 to on 1.5 6.0 1.5 7.0 1.5 7.2 t oshl outputtooutput skew 1.0 ns t oslh (note 3.) 1.0 3. skew is defined as the absolute value of the difference between the actual propagation delay for any two separate outputs of the same d evice. the specification applies to any outputs switching in the same direction, either hightolow (t oshl ) or lowtohigh (t oslh ); parameter guaranteed by design. capacitive characteristics symbol parameter condition typical unit c in input capacitance v cc = 3.3 v, v i = 0 v or v cc 7 pf c out output capacitance v cc = 3.3 v, v i = 0 v or v cc 8 pf c pd power dissipation capacitance 10 mhz, v cc = 3.3 v, v i = 0 v or v cc 25 pf
mc74lcx138 http://onsemi.com 5 v cc 0 v v oh v ol an, e3 o n t plh t phl vmi vmo vmo vmi waveform 2: propagation delays for noninverting outputs 2.7 v 0 v v oh v ol an, e1 , e2 on t plh t phl waveform 1: propagation delays for inverting outputs vmi vmo vmo vmi vcc symbol 3.3 v + 0.3 v 2.7 v 2.5 v + 0.2 v vmi 1.5 v 1.5 v vcc/2 vmo 1.5 v 1.5 v vcc/2 figure 4. ac waveforms pulse generator r t dut v cc r l c l figure 5. test circuit c l = 50 pf at v cc = 3.3 + 0.3 v or equivalent (includes jig and probe capacitance) c l = 30 pf at v cc = 2.5 + 0.2 v or equivalent (includes jig and probe capacitance) r l = r 1 = 500 w or equivalent r t = z out of pulse generator (typically 50 w )
mc74lcx138 http://onsemi.com 6 package dimensions so16 d suffix 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 tssop16 dt suffix case 948f01 issue o ??? ??? 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 nn 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
mc74lcx138 http://onsemi.com 7 package dimensions eiaj so16 m suffix case 96601 issue o 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
mc74lcx138 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. mc74lcx138/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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