Revised April 2000 DM74S157 • DM74S158 Quad 1 of 2 Line Data Selector/Multiplexer 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 DM74S157 presents true data whereas the DM74S158 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 DM74S157 5 ns DM74S158 4 ns ■ Typical power dissipation DM74S157 250 mW DM74S158 195 mW Ordering Code: Order Number Package Number Package Description DM74S157N N16E 16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide DM74S158N N16E 16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide Connection Diagrams DM74S157 © 2000 Fairchild Semiconductor Corporation DM74S158 DS006470 www.fairchildsemi.com DM74S157 • DM74S158 Quad 1 of 2 Line Data Selector/Multiplexer August 1986 DM74S157 • DM74S158 Function Table Inputs Output Y Strobe Select A B 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 DM74S157 DM74S158 www.fairchildsemi.com 2 DM74S157 DM74S158 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 5.5V 0°C to +70°C Operating Free Air Temperature Range −65°C to +150°C Storage Temperature Range DM74157 Recommended Operating Conditions Symbol Parameter Min Nom Max 4.75 5 5.25 Units VCC Supply Voltage VIH HIGH Level Input Voltage VIL LOW Level Input Voltage 0.8 V IOH HIGH Level Output Current −1 mA IOL LOW Level Output Current 20 mA TA Free Air Operating Temperature 70 °C V 2 V 0 DM74S157 Electrical Characteristics over recommended operating free air temperature (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 VIH = Min, VIL = Max Min Typ (Note 2) Max −1.2 2.7 3.4 0.5 V 1 mA Input Current @ Max Input Voltage VCC = Max, VI = 5.5V IIH HIGH Level VCC = Max S or G 100 Input Current VI = 2.7V A or B 50 HIGH Level VCC = Max S or G −4 Input Current VI = 0.5V A or B −2 IOS Short Circuit Output Current VCC = Max (Note 3) ICC Supply Current VCC = Max (Note 4) −40 V V II IIL Units µA mA −100 mA 78 mA 50 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 4.5V applied to all inputs and all outputs OPEN. DM74S157 Switching Characteristics at VCC = 5V and TA = 25°C RL = 280Ω Symbol Parameter CL = 15 pF From (Input) To (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 tPLH Propagation Delay Time LOW-to-HIGH Level Output tPHL Propagation Delay Time HIGH-to-LOW Level Output Min Max CL = 50 pF Min Units Max Data to Y 7.5 10 ns Data to Y 6.5 10 ns Strobe to Y 12.5 15 ns Strobe to Y 12 15 ns Select to Y 15 17 ns Select to Y 15 17 ns 3 www.fairchildsemi.com DM74S157 • DM74S158 Absolute Maximum Ratings(Note 1) DM74S157 • DM74S158 DM74S158 Recommended Operating Conditions Symbol Parameter Min Nom Max 4.75 5 5.25 Units VCC Supply Voltage VIH HIGH Level Input Voltage VIL LOW Level Input Voltage 0.8 V IOH HIGH Level Output Current −1 mA IOL LOW Level Output Current 20 mA TA Free Air Operating Temperature 70 °C V 2 V 0 DM74S158 Electrical Characteristics over recommended operating free air temperature (unless otherwise noted) Symbol Parameter Conditions VI Input Clamp Voltage VCC = Min, II = − 18 mA VOH HIGH Level VCC = Min, IOH = Max VOL Output Voltage VIL = Max, VIH = Min LOW Level VCC = Min, IOL = Max Output Voltage VIH = Min, VIL = Max Min Typ (Note 5) Max −1.2 2.7 3.4 0.5 V 1 mA II Input Current @ Max Input Voltage VCC = Max, VI = 5.5V HIGH Level VCC = Max S or G 100 Input Current VI = 2.7V A or B 50 LOW Level VCC = Max S or G −4 Input Current VI = 0.5V A or B −2 IOS Short Circuit Output Current VCC = Max (Note 6) ICC1 Supply Current VCC = Max (Note 7) ICC2 Supply Current VCC = Max (Note 8) −40 39 V V IIH IIL Units µA mA −100 mA 61 mA 81 mA 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: ICC1 is measured with all outputs OPEN and all inputs at 4.5V. Note 8: ICC2 is measured with B, G, and S inputs grounded, A inputs at 4.5V, and all outputs OPEN. DM74S158 Switching Characteristics at VCC = 5V and TA = 25 °C RL = 280Ω Symbol Parameter CL = 15 pF From (Input) To (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 tPLH Propagation Delay Time LOW-to-HIGH Level Output tPHL Propagation Delay Time HIGH-to-LOW Level Output www.fairchildsemi.com Min CL = 50 pF Max Min Units Max Data to Y 6 9 ns Data to Y 6 9 ns Strobe to Y 11.5 12 ns Strobe to Y 12 14 ns Select to Y 12 15 ns Select to Y 12 15 ns 4 DM74S157 • DM74S158 Quad 1 of 2 Line Data Selector/Multiplexer Physical Dimensions inches (millimeters) unless otherwise noted 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 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: 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. 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. www.fairchildsemi.com 5 www.fairchildsemi.com