Revised February 2000 DM74ALS157 • DM74ALS158 Quad 1-of-2 Line Data Selector/Multiplexer General Description Features 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 ALS157 presents true data whereas the ALS158 presents inverted data to minimize propagation delay time. ■ Switching specifications at 50 pF ■ Switching specifications guaranteed over full temperature and VCC range ■ Advanced oxide-isolated, ion-implanted Schottky TTL process ■ Functionally and pin for pin compatible with Schottky and low power Schottky TTL counterpart ■ Improved AC performance over Schottky and low power Schottky counterparts ■ Expand any data input point ■ Multiplex dual data buses ■ General four functions of two variables (one variable is common) ■ Source programmable counters Ordering Code: Order Number Package Number Package Description DM74ALS157M M16A 16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150 Narrow DM74ALS157SJ M16D 16-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide DM74ALS157N N16E 16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide DM74ALS158N 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 Diagram Function Table Inputs Strobe Select Output Y A B DM74ALS157 DM74ALS158 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 © 2000 Fairchild Semiconductor Corporation DS006205 www.fairchildsemi.com DM74ALS157 • DM74ALS158 Quad 1-of-2 Line Data Selector/Multiplexer April 1984 DM74ALS157 • DM74ALS158 Logic Diagrams DM74ALS157 DM74ALS158 www.fairchildsemi.com 2 Supply Voltage 7V Input Voltage 7V 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. 0°C to +70°C Operating Free Air Temperature Range −65°C to +150°C Storage Temperature Range Recommended Operating Conditions Symbol Parameter Min Nom Max Units 4.5 5 5.5 V LOW Level Input Voltage 0.8 V VCC Supply Voltage VIH HIGH Level Input Voltage VIL 2 V IOH HIGH Level Output Current −0.4 mA IOL LOW Level Output Current 8 mA TA Free Air Operating Temperature 70 °C 0 Electrical Characteristics over recommended operating free air temperature range. All typical values are measured at VCC = 5V, TA = 25°C. Symbol Parameter Conditions VIK Input Clamp Voltage VCC = 4.5V, II = −18 mA VOH HIGH Level Output Voltage IOH = −0.4 mA, VCC = 4.5V to 5.5V VOL LOW Level VCC = 4.5V Output Voltage II Input Current @ Maximum Input Voltage Min Typ Max Units −1.2 V V VCC − 2 V IOL = 4 mA 0.25 0.4 IOL = 8 mA 0.35 0.5 V 0.1 mA VCC = 5.5V, VIH = 7V IIH HIGH Level Input Current VCC = 5.5V, VIH = 2.7V 20 µA IIL LOW Level Input Current VCC = 5.5V, VIL = 0.4V −0.1 mA IO Output Drive Current VCC = 5.5V VO = 2.25V −112 mA ICC Supply Current VCC = 5.5V DM74ALS157 6 11 mA All Inputs = 4.5V DM74ALS158 5 10 mA −30 Switching Characteristics over recommended operating free air temperature range. From (Input) Symbol Parameter To (Output) tPLH tPHL Propagation Delay Time Data to Y Conditions VCC = 4.5V to 5.5V LOW-to-HIGH Level Output CL = 50 pF Propagation Delay Time RL = 500Ω HIGH-to-LOW Level Output tPLH Propagation Delay Time Strobe to Y LOW-to-HIGH Level Output tPHL Propagation Delay Time HIGH-to-LOW Level Output tPLH Propagation Delay Time Select to Y LOW-to-HIGH Level Output tPHL Propagation Delay Time HIGH-to-LOW Level Output 3 DM74ALS157 DM74ALS158 Min Max Min Max 3 14 3 15 ns 2 12 1 8 ns 6 20 5 18 ns 4 13 5 18 ns 7 24 5 19 ns 4 14 5 18 ns Units www.fairchildsemi.com DM74ALS157 • DM74ALS158 Absolute Maximum Ratings(Note 1) DM74ALS157 • DM74ALS158 Physical Dimensions inches (millimeters) unless otherwise noted 16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150 Narrow Package Number M16A www.fairchildsemi.com 4 DM74ALS157 • DM74ALS158 Physical Dimensions inches (millimeters) unless otherwise noted (Continued) 16-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide Package Number M16D 5 www.fairchildsemi.com DM74ALS157 • DM74ALS158 Quad 1-of-2 Line Data Selector/Multiplexer 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. 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 www.fairchildsemi.com 6