? 2003 fairchild semiconductor corporation ds011608 www.fairchildsemi.com may 1993 revised october 2003 74lvx157 low voltage quad 2-input multiplexer 74lvx157 low voltage quad 2-input multiplexer general description the lvx157 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 outputs present the selected data in the true (noninverted) form. the lvx157 can also be used as a function generator. features input voltage level translation from 5v to 3v ideal for low power/low noise 3.3v applications guaranteed simultaneous switching noise level and dynamic threshold performance ordering code: devices are also available in tape and reel. specify by appending letter suffix ?x? to the ordering code. logic symbols ieee/iec connection diagram pin descriptions order number package number package description 74lvx157m m16a 16-lead small outline integrated circuit (soic), jedec ms-012, 0.150" narrow 74lvx157sj m16d 16-lead small outline package (sop), eiaj type ii, 5.3mm wide 74lvx157mtc mtc16 16-lead thin shrink small outline package (tssop), jedec mo-153, 4.4mm wide pin names description i 0a ? i 0d source 0 data inputs i 1a ? i 1d source 1 data inputs e enable input s select input z a ? z d outputs
www.fairchildsemi.com 2 74lvx157 truth table h = high voltage level l = low voltage level x = immaterial functional description the lvx157 is a quad 2-input multiplexer. it selects four bits of data from two sources under the control of a com- mon 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 lvx157 is the logic implementation of a 4-pole, 2-position switch where the position of the switch is determined by the logic levels sup- plied to the select input. the logic equations for the outputs are shown below: 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 lvx157 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 lvx157 can generate any four of the sixteen different functions of two variables with one variable common. this is useful for implementing gating functions. logic diagram inputs outputs e si 0 i 1 z hxxx l lhxl l lhxh h ll lx l llhx h
3 www.fairchildsemi.com 74lvx157 absolute maximum ratings (note 1) recommended operating conditions (note 2) note 1: the ? absolute maximum ratings ? are those values beyond which the safety of the device cannot be guaranteed. the device should not be operated at these limits. the parametric values defined in the electrical characteristics tables are not guaranteed at the absolute maximum ratings. the ? recommended operating conditions ? table will define the conditions for actual device operation. note 2: unused inputs must be held high or low. they may not float. dc electrical characteristics noise characteristics (note 3) note 3: input t r = t f = 3ns supply voltage (v cc ) ? 0.5v to + 7.0v dc input diode current (i ik ) v i = ? 0.5v ? 20 ma dc input voltage (v i ) ? 0.5v to 7v dc output diode current (i ok ) v o = ? 0.5v ? 20 ma v o = v cc + 0.5v + 20 ma dc output voltage (v o ) ? 0.5v to v cc + 0.5v dc output source or sink current (i o ) 25 ma dc v cc or ground current (i cc or i gnd ) 50 ma storage temperature (t stg ) ? 65 c to + 150 c power dissipation 180 mw supply voltage (v cc ) 2.0v to 3.6v input voltage (v i ) 0v to 5.5v output voltage (v o )0v to v cc operating temperature (t a ) ? 40 c to + 85 c input rise and fall time ( ? t/ ? v) 0 ns/v to 100 ns/v symbol parameter v cc t a = + 25 c t a = ? 40 c to + 85 c units conditions min typ max min max v ih high level 2.0 1.5 1.5 input voltage 3.0 2.0 2.0 v 3.6 2.4 2.4 v il low level 2.0 0.5 0.5 input voltage 3.0 0.8 0.8 v 3.6 0.8 0.8 v oh high level 2.0 1.9 2.0 1.9 v in = v il or v ih i oh = ? 50 a output voltage 3.0 2.9 3.0 2.9 v i oh = ? 50 a 3.0 2.58 2.48 i oh = ? 4 ma v ol low level 2.0 0.0 0.1 0.1 v in = v il or v ih i ol = 50 a output voltage 3.0 0.0 0.1 0.1 v i ol = 50 a 3.0 0.36 0.44 i ol = 4 ma i in input leakage current 3.6 0.1 1.0 av in = 5.5v or gnd i cc quiescent supply current 3.6 4.0 40.0 av in = v cc or gnd symbol parameter v cc t a = 25 c units c l (pf) (v) typ limit v olp quiet output maximum dynamic v ol 3.3 0.3 0.5 v 50 v olv quiet output minimum dynamic v ol 3.3 ? 0.3 ? 0.5 v 50 v ihd minimum high level dynamic input voltage 3.3 2.0 v 50 v ild maximum low level dynamic input voltage 3.3 0.8 v 50
www.fairchildsemi.com 4 74lvx157 ac electrical characteristics note 4: parameter guaranteed by design. t oslh = |t plhm ? t plhn |. t oshl = |t phlm ? t phln |. capacitance note 5: c pd is defined as the value of the internal equivalent capacitance which is calculated from the operating current consumption with out load. average operating current can be obtained by the equation: i cc(opr.) = c pd v cc f in + i cc symbol parameter v cc t a = + 25 c t a = ? 40 c to + 85 c units c l (pf) (v) min typ max min max t plh propagation 2.7 6.6 12.5 1.0 15.5 ns 15 t phl delay time 9.1 16.0 1.0 19.0 50 i n to z n 3.3 0.3 5.1 7.9 1.0 9.5 15 7.6 11.4 1.0 13.0 50 t plh propagation 2.7 8.9 16.9 1.0 20.5 ns 15 t phl delay time 11.4 20.4 1.0 24.0 50 s to z n 3.3 0.3 7.0 11.0 1.0 13.0 15 9.5 14.5 1.0 16.5 50 t plh t phl propagation 2.7 9.1 17.6 1.0 20.5 ns 15 delay time 11.6 21.1 1.0 24.0 50 e to z n 3.3 0.3 7.2 11.5 1.0 13.5 15 9.7 15.0 1.0 17.0 50 t oshl output to output 2.7 1.5 1.5 ns 50 t oslh skew (note 4) 3.3 1.5 1.5 symbol parameter t a = + 25 c t a = ? 40 c to + 85 c units min typ max min max c in input capacitance 4 10 10 pf c pd power dissipation capacitance (note 5) 20 pf
5 www.fairchildsemi.com 74lvx157 physical dimensions inches (millimeters) unless otherwise noted 16-lead small outline integrated circuit (soic), jedec ms-012, 0.150" narrow package number m16a
www.fairchildsemi.com 6 74lvx157 physical dimensions inches (millimeters) unless otherwise noted (continued) 16-lead small outline package (sop), eiaj type ii, 5.3mm wide package number m16d
7 www.fairchildsemi.com 74lvx157 low voltage quad 2-input multiplexer physical dimensions inches (millimeters) unless otherwise noted (continued) 16-lead thin shrink small outline package (tssop), jedec mo-153, 4.4mm wide package number mtc16 fairchild does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and fairchild reserves the right at any time without notice to change said circuitry and specifications. life support policy fairchild ? s products are not authorized for use as critical components in life support devices or systems without the express written approval of the president of fairchild semiconductor corporation. as used herein: 1. life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, and (c) whose failure to perform when properly used in accordance with instructions for use provided in the labeling, can be rea- sonably expected to result in a significant injury to the user. 2. a critical component in any component of a life support device or system whose failure to perform can be rea- sonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. www.fairchildsemi.com
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