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| DM74S157 * DM74S158 Quad 1 of 2 Line Data Selector/Multiplexer August 1986 Revised April 2000 DM74S157 * DM74S158 Quad 1 of 2 Line Data Selector/Multiplexer 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 DM74S157 presents true data whereas the DM74S158 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 DM74S157 DM74S158 DM74S157 DM74S158 5 ns 4 ns 250 mW 195 mW s Typical power dissipation Ordering Code: Order Number DM74S157N DM74S158N Package Number N16E N16E Package Description 16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide 16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide Connection Diagrams DM74S157 DM74S158 (c) 2000 Fairchild Semiconductor Corporation DS006470 www.fairchildsemi.com DM74S157 * DM74S158 Function Table Inputs Strobe H L L L L H = HIGH Level L = LOW Level X = Don't Care Output Y A X L H X X B X X X L H DM74S157 DM74S158 L L H L H H H L H L Select X L L H H Logic Diagrams DM74S157 DM74S158 www.fairchildsemi.com 2 DM74S157 * DM74S158 Absolute Maximum Ratings(Note 1) Supply Voltage Input Voltage Operating Free Air Temperature Range Storage Temperature Range 7V 5.5V 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. DM74157 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 4.75 2 0.8 -1 20 70 Nom 5 Max 5.25 Units V V V mA mA C DM74S157 Electrical Characteristics over recommended operating free air temperature (unless otherwise noted) Symbol VI VOH VOL II IIH IIL IOS ICC Parameter Input Clamp Voltage HIGH Level Output Voltage LOW Level Output Voltage HIGH Level Input Current HIGH 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 VIH = Min, VIL = Max VCC = Max VI = 2.7V VCC = Max VI = 0.5V VCC = Max (Note 3) VCC = Max (Note 4) S or G A or B S or G A or B -40 50 2.7 3.4 0.5 1 100 50 -4 -2 -100 78 Min Typ (Note 2) Max -1.2 Units V V V mA A mA mA mA Input Current @ Max Input Voltage VCC = Max, VI = 5.5V 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 4.5V applied to all inputs and all outputs OPEN. DM74S157 Switching Characteristics at VCC = 5V and TA = 25C RL = 280 Symbol tPLH tPHL tPLH tPHL tPLH tPHL Parameter 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 From (Input) To (Output) Data to Y Data to Y Strobe to Y Strobe to Y Select to Y Select to Y CL = 15 pF Min Max 7.5 6.5 12.5 12 15 15 CL = 50 pF Min Max 10 10 15 15 17 17 ns ns ns ns ns ns Units 3 www.fairchildsemi.com DM74S157 * DM74S158 DM74S158 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 4.75 2 0.8 -1 20 70 Nom 5 Max 5.25 Units V V V mA mA C DM74S158 Electrical Characteristics over recommended operating free air temperature (unless otherwise noted) Symbol VI VOH VOL II IIH IIL IOS ICC1 ICC2 Parameter Input Clamp Voltage HIGH Level Output Voltage LOW Level Output Voltage HIGH Level Input Current LOW Level Input Current Short Circuit Output Current Supply Current Supply Current Conditions VCC = Min, II = - 18 mA VCC = Min, IOH = Max VIL = Max, VIH = Min VCC = Min, IOL = Max VIH = Min, VIL = Max VCC = Max VI = 2.7V VCC = Max VI = 0.5V VCC = Max (Note 6) VCC = Max (Note 7) VCC = Max (Note 8) S or G A or B S or G A or B -40 39 2.7 3.4 0.5 1 100 50 -4 -2 -100 61 81 Min Typ (Note 5) Max -1.2 Units V V V mA A mA mA mA mA Input Current @ Max Input Voltage VCC = Max, VI = 5.5V 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: 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 = 280 Symbol Parameter From (Input) To (Output) 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 CL = 15 pF Min Max 6 6 11.5 12 12 12 CL = 50 pF Min Max 9 9 12 14 15 15 ns ns ns ns ns ns Units www.fairchildsemi.com 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: 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. 5 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 www.fairchildsemi.com |
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