Revised April 2000 DM74LS157 • DM74LS158 Quad 2-Line to 1-Line Data Selectors/Multiplexers General Description Applications 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. • Expand any data input point • Multiplex dual data buses • Generate four functions of two variables (one variable is common) • Source programmable counters Features ■ Buffered inputs and outputs ■ Typical Propagation Time DM74LS157 9 ns DM74LS158 7 ns ■ Typical Power Dissipation DM74LS157 49 mW DM74LS158 24 mW Ordering Code: Order Number Package Number Package Description DM74LS157M M16A 16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150 Narrow DM74LS157SJ M16D 16-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide DM74LS157N N16E 16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide DM74LS158M M16A 16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150 Narrow DM74LS158N N16E 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 © 2000 Fairchild Semiconductor Corporation DM74LS158 DS006396 www.fairchildsemi.com DM74LS157 • DM74LS158 Quad 2-Line to 1-Line Data Selectors/Multiplexers September 1986 DM74LS157 • DM74LS158 Function Table Inputs Output Y Strobe Select A B DM74LS157 DM74LS158 H X X X L H L L L X L H L L H X H L L H X L L H L H X H H L H = HIGH Level L = LOW Level X = Don’t Care Logic Diagrams DM74LS157 www.fairchildsemi.com DM74LS158 2 Supply Voltage 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. 7V Input Voltage 7V 0°C to +70°C Operating Free Air Temperature Range −65°C to +150°C Storage Temperature Range DM74LS157 Recommended Operating Conditions Symbol Parameter Min Nom Max 4.75 5 5.25 Units VCC Supply Voltage VIH HIGH Level Input Voltage V VIL LOW Level Input Voltage 0.8 V IOH HIGH Level Output Current −0.4 mA IOL LOW Level Output Current 8 mA TA Free Air Operating Temperature 70 °C 2 V 0 DM74LS157 Electrical Characteristics over recommended operating free air temperature range (unless otherwise noted) Symbol Parameter Conditions Min VI Input Clamp Voltage VCC = Min, II = −18 mA VOH HIGH Level Output Voltage VCC = Min, IOH = Max, VIL = Max, VIH = Min VOL II IIH IIL Typ (Note 2) Max −1.5 2.7 3.4 LOW Level VCC = Min, IOL = Max, VIL = Max, VIH = Min 0.35 0.5 IOL = 4 mA, VCC = Min 0.25 0.4 Input Current @ Max VCC = Max S or G 0.2 Input Voltage VI = 7V A or B 0.1 HIGH Level VCC = Max S or G 40 Input Current VI = 2.7V A or B 20 LOW Level VCC = Max S or G −0.8 Input Current VI = 0.4V A or B −0.4 Short Circuit Output Current VCC = Max (Note 3) ICC Supply Current VCC = Max (Note 4) −20 9.7 V V Output Voltage IOS Units V mA µA mA −100 mA 16 mA Note 2: All typicals are at VCC = 5V, TA = 25°C. 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 = 25°C RL = 2 kΩ From (Input) Symbol Parameter To (Output) CL = 15 pF Min tPLH Propagation Delay Time LOW-to-HIGH Level Output tPHL Propagation Delay Time HIGH-to-LOW Level Output tPLH Propagation Delay Time LOW-to-HIGH Level Output tPHL Propagation Delay Time HIGH-to-LOW Level Output tPLH Propagation Delay Time LOW-to-HIGH Level Output tPHL Propagation Delay Time HIGH-to-LOW Level Output Max CL = 50 pF Min Units Max Data to Y 14 18 ns Data to Y 14 23 ns Strobe to Y 20 24 ns Strobe to Y 21 30 ns Select to Y 23 28 ns Select to Y 27 32 ns 3 www.fairchildsemi.com DM74LS157 • DM74LS158 Absolute Maximum Ratings(Note 1) DM74LS157 • DM74LS158 DM74LS158 Recommended Operating Conditions Symbol Parameter Min Nom Max 4.75 5 5.25 Units VCC Supply Voltage VIH HIGH Level Input Voltage V VIL LOW Level Input Voltage 0.8 V IOH HIGH Level Output Current −0.4 mA IOL LOW Level Output Current 8 mA TA Free Air Operating Temperature 70 °C 2 V 0 DM74LS158 Electrical Characteristics over recommended operating free air temperature range (unless otherwise noted) Symbol Parameter Conditions VI Input Clamp Voltage VCC = Min, II = −18 mA VOH HIGH Level VCC = Min, IOH = Max Output Voltage VIL = Max, VIH = Min VOL LOW Level VCC = Min, IOL = Max Output Voltage VIL = Max, VIH = Min Min 2.7 IOL = 4 mA, VCC = Min II IIH Typ (Note 5) Max Units −1.5 V 3.4 V 0.35 0.5 0.25 0.4 Input Current @ Max VCC = Max S or G 0.2 Input Voltage VI = 7V A or B 0.1 HIGH Level VCC = Max S or G 40 Input Current VI = 2.7V A or B 20 LOW Level VCC = Max S or G −0.8 Input Current VI = 0.4V A or B −0.4 IOS Short Circuit Output Current VCC = Max (Note 6) ICC Supply Current VCC = Max (Note 7) IIL −20 V mA µA mA −100 mA 8 mA 4.8 Note 5: All typicals are at VCC = 5V, TA = 25°C. 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 at VCC = 5V and TA = 25°C RL = 2 kΩ From (Input) Symbol Parameter To (Output) CL = 15 pF Min tPLH Propagation Delay Time LOW-to-HIGH Level Output tPHL Propagation Delay Time HIGH-to-LOW Level Output tPLH Propagation Delay Time LOW-to-HIGH Level Output tPHL Propagation Delay Time HIGH-to-LOW Level Output tPLH Propagation Delay Time LOW-to-HIGH Level Output tPHL Propagation Delay Time HIGH-to-LOW Level Output www.fairchildsemi.com Max CL = 50 pF Min Units Max Data to Y 12 18 ns Data to Y 12 21 ns Strobe to Y 17 23 ns Strobe to Y 18 28 ns Select to Y 20 24 ns Select to Y 24 36 ns 4 DM74LS157 • DM74LS158 Physical Dimensions inches (millimeters) unless otherwise noted 16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150 Narrow Package Number M16A 5 www.fairchildsemi.com DM74LS157 • DM74LS158 Physical Dimensions inches (millimeters) unless otherwise noted (Continued) 16-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide Package Number M16D www.fairchildsemi.com 6 DM74LS157 • DM74LS158 Quad 2-Line to 1-Line Data Selectors/Multiplexers Physical Dimensions inches (millimeters) unless otherwise noted (Continued) 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. 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