DM74LS157 DM74LS158 Quad 2-Line to 1-Line Data Selectors/Multiplexers
September 1986 Revised April 2000

General Description

These data selectors/multiplexers contain 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 DM74LS157 presents true data whereas the DM74LS158 presents inverted data to minimize propagation delay time.

Applications

Expand any data input point Multiplex dual data buses Generate four functions of two variables (one variable is common) Source programmable counters

Features

s Buffered inputs and outputs s Typical Propagation Time DM74LS157 DM74LS158 DM74LS157 DM74LSns 7 ns 49 mW 24 mW
s Typical Power Dissipation

Ordering Code:

Order Number DM74LS157M DM74LS157SJ DM74LS157N DM74LS158M DM74LS158N Package Number M16A M16D N16E M16A N16E Package Description 16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150 Narrow 16-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide 16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide 16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150 Narrow 16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide
Devices also available in Tape and Reel. Specify by appending the suffix letter X to the ordering code.

Connection Diagrams

DM74LS157 DM74LS158
2000 Fairchild Semiconductor Corporation

DS006396

www.fairchildsemi.com

Function Table

Inputs Strobe H L L L L
H = HIGH Level L = LOW Level X = Dont Care
Output Y A X L H X X B X X X L H DM74LS157 DM74LS158 L L H L H H H L H L

Select X L L H H

Logic Diagrams
Absolute Maximum Ratings(Note 1)
Supply Voltage Input Voltage Operating Free Air Temperature Range Storage Temperature Range 7V 7V 0C to +70C 65C to +150C
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.
DM74LS157 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 Free Air Operating Temperature 0 Parameter Min 4.0.8 0.70 Nom 5 Max 5.25 Units V V V mA mA C
DM74LS157 Electrical Characteristics
over recommended operating free air temperature range (unless otherwise noted) Symbol VI VOH VOL II IIH IIL IOS ICC Parameter Input Clamp Voltage HIGH Level Output Voltage LOW Level Output Voltage Input Current @ Max Input Voltage HIGH Level Input Current LOW Level Input Current Short Circuit Output Current Supply Current Conditions VCC = Min, II = 18 mA VCC = Min, IOH = Max, VIL = Max, VIH = Min VCC = Min, IOL = Max, VIL = Max, VIH = Min IOL = 4 mA, VCC = Min VCC = Max VI = 7V VCC = Max VI = 2.7V VCC = Max VI = 0.4V VCC = Max (Note 3) VCC = Max (Note 4) S or G A or B S or G A or B S or G A or B 20 9.7 2.7 3.4 0.35 0.25 0.5 0.4 0.2 0.20 0.8 0.16 Min Typ (Note 2) Max 1.5 Units V V V mA A mA mA mA
Note 2: All typicals are at VCC = 5V, TA = 25C. Note 3: Not more than one output should be shorted at a time, and the duration should not exceed one second. Note 4: ICC is measured with 4.5V applied to all inputs and all outputs OPEN.
DM74LS157 Switching Characteristics
at VCC = 5V and TA = 25C From (Input) Symbol Parameter To (Output) CL = 15 pF Min tPLH tPHL tPLH tPHL tPLH tPHL Propagation Delay Time LOW-to-HIGH Level Output Propagation Delay Time HIGH-to-LOW Level Output Propagation Delay Time LOW-to-HIGH Level Output Propagation Delay Time HIGH-to-LOW Level Output Propagation Delay Time LOW-to-HIGH Level Output Propagation Delay Time HIGH-to-LOW Level Output Data to Y Data to Y Strobe to Y Strobe to Y Select to Y Select to Y Max RL = 2 k CL = 50 pF Min Max ns ns ns ns ns ns Units
DM74LS158 Recommended Operating Conditions
DM74LS158 Electrical Characteristics

over recommended operating free air temperature range (unless otherwise noted) Symbol VI VOH VOL Parameter Input Clamp Voltage HIGH Level Output Voltage LOW Level Output Voltage II IIH IIL IOS ICC Input Current @ Max Input Voltage HIGH Level Input Current LOW Level Input Current Short Circuit Output Current Supply Current Conditions VCC = Min, II = 18 mA VCC = Min, IOH = Max VIL = Max, VIH = Min VCC = Min, IOL = Max VIL = Max, VIH = Min IOL = 4 mA, VCC = Min VCC = Max VI = 7V VCC = Max VI = 2.7V VCC = Max VI = 0.4V VCC = Max (Note 6) VCC = Max (Note 7) S or G A or B S or G A or B S or G A or B 20 4.8 2.7 3.4 0.35 0.25 0.5 0.4 0.2 0.20 0.8 0.8 mA A mA mA mA Min Typ (Note 5) Max 1.5 Units V V
Note 5: All typicals are at VCC = 5V, TA = 25C. Note 6: Not more than one output should be shorted at a time, and the duration should not exceed one second. Note 7: ICC is measured with 4.5V applied to all inputs and all outputs OPEN.
DM74LS158 Switching Characteristics
Physical Dimensions inches (millimeters) unless otherwise noted
16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150 Narrow Package Number M16A
Physical Dimensions inches (millimeters) unless otherwise noted (Continued)
16-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide Package Number M16D
16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide Package Number N16E
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 FAIRCHILDS 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 reasonably expected to result in a significant injury to the user. 7 2. A critical component in any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. www.fairchildsemi.com