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| TECHNICAL DATA IN74LS157 Quad 2-Input Data Selector/Multiplexer This monolitic data selector/multiplexer contains inverters and drivers to supply full on-chip data selection to the four output gates. A separate strobe input is provided. A 4-bit word is selected from one of two sources and is routed to the four outputs. The LS157 has the same functions and pin connections as the LS257 but the latter is provided with 3-state outputs. * Buffered Inputs and Outputs * Common Strobe/Select input for all 4 circuits ORDERING INFORMATION IN74LS157N Plastic IN74LS157D SOIC TA =0 to 70 C for all packages PIN ASSIGNMENT LOGIC DIAGRAM FUNCTION TABLE Inputs PIN 16 =VCC PIN 8 = GND Output Enable H L L Select X L H Outputs Y0-Y3 L A0-A3 B0-B3 X=don't care A0-A3,B0-B3=the levels of the respective Data-Word Inputs 1 IN74LS157 MAXIMUM RATINGS* Symbol VCC VIN VOUT Tstg * Parameter Supply Voltage Input Voltage Output Voltage Storage Temperature Range Value 7.0 7.0 5.5 -65 to +150 Unit V V V C Maximum Ratings are those values beyond which damage to the device may occur. Functional operation should be restricted to the Recommended Operating Conditions. RECOMMENDED OPERATING CONDITIONS Symbol VCC VIH VIL IOH IOL TA Supply Voltage High Level Input Voltage Low Level Input Voltage High Level Output Current Low Level Output Current Ambient Temperature Range 0 Parameter Min 4.75 2.0 0.8 -0.4 8.0 +70 Max 5.25 Unit V V V mA mA C DC ELECTRICAL CHARACTERISTICS over full operating conditions Guaranteed Limit Symbol VIK VOH VOL IIH Parameter Input Clamp Voltage High Level Output Voltage Low Level Output Voltage High Level Input Current Test Conditions VCC = min, IIN = -18 mA VCC = min, IOH = -0.4 mA VCC = min, IOL = 4 mA VCC = min, IOL = 8 mA VCC = max VIN = 2.7 V VCC = max VIN = 7.0 V IIL IO ICC Low Level Input Current Output Short Circuit Current Supply Current VCC = max VIN = 0.4 V for pins 1,15 A or B input for pins 1,15 A or B input for pins 1,15 A or B input -20 2.7 0.4 0.5 40 20 0.2 0.1 -0.8 -0.4 -100 16 mA mA mA mA A Min Max -1.5 Unit V V V VCC = max, VO = 0 V (Note 1) VCC = max (Note 2) Note 1: Not more than one output should be shorted at a time, and the duration should not exceed one second. Note 2: ICC is measured with all outputs open, and 4.5 V applied to all inputs. 2 IN74LS157 AC ELECTRICAL CHARACTERISTICS (TA=25C, VCC = 5.0 V, CL = 15 pF, RL = 2 k, tr =15 ns, tf = 6.0 ns) Symbol tPLH tPHL tPLH tPHL tPLH tPHL Parameter Propagation Delay, Input A or B to Output Y Propagation Delay, Input A or B to Output Y Propagation Delay, Select to Output Y Propagation Delay, Select to Output Y Propagation Delay, Output Enable to Output Y Propagation Delay, Output Enable to Output Y Min Max 14 14 23 27 20 21 Unit ns ns ns ns ns ns Figure 1. Switching Waveforms Figure 2. Switching Waveforms NOTES A. CL includes probe and jig capacitance. B. All diodes are 1N916 or 1N3064. Figure 3. Test Circuit 3 |
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