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| DM74AS157 * DM74AS158 Quad 1 of 2 Line Data Selector/Multiplexer April 1984 Revised March 2000 DM74AS157 * DM74AS158 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 AS157 presents true data whereas the AS158 presents inverted data to minimize propagation delay time. Features s Switching specifications at 50 pF s Switching specifications guaranteed over full temperature and VCC range s Advanced oxide-isolated, ion-implanted Schottky TTL process s Functionally and pin for pin compatible with Schottky, low power Schottky, and advanced low power Schottky TTL counterpart s Improved AC performance over Schottky, low power Schottky, and advanced low power Schottky counterparts s Expand any data input point s Multiplex dual data buses s General four functions of two variables (one variable is common) s Source programmable counters Ordering Code: Order Number DM74AS157M DM74AS157SJX DM74AS157N DM74AS158M DM74AS158N 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 Diagram Function Table Inputs STROBE Select 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 DM74AS157 DM74AS158 L L H L H H H L H L X L L H H (c) 2000 Fairchild Semiconductor Corporation DS006290 www.fairchildsemi.com DM74AS157 * DM74AS158 Logic Diagrams DM74AS157 DM74AS158 www.fairchildsemi.com 2 DM74AS157 * DM74AS158 Absolute Maximum Ratings(Note 1) Supply Voltage Input Voltage Operating Free Air Temperature Range Storage Temperature Range Typical JA N Package 75.0 C/W 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. 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 4.5 2 0.8 -2 20 70 Nom 5 Max 5.5 Units V V V mA mA C Electrical Characteristics over recommended operating free air temperature range. All typical values are measured at VCC = 5V, TA = 25C. Symbol VIK VOH VOL II IIH IIL IO (Note 2) ICC Parameter Input Clamp Voltage HIGH Level Output Voltage LOW Level Output Voltage Input Current at Max Input Voltage HIGH Level Input Current LOW Level Input Current Output Drive Current Supply Current Conditions VCC = 4.5V, II = -18 mA VCC = 4.5V to 5.5V IOH = -2 mA VCC = 4.5V IOL = 20 mA VCC = 5.5V VIH = 7V VCC = 5.5V VIH = 2.7V VCC = 5.5V VIL = 0.4V VCC = 5.5V, VO = 2.25V VCC = 5.5V DM74AS157 DM74AS158 Select All Others Select All Others Select All Others -30 17.5 15.6 VCC - 2 0.35 0.5 0.2 0.1 40 20 -1 -0.5 -112 28 22.5 Min Typ Max -1.2 Units V V V mA A mA mA mA mA Note 2: The output conditions have been chosen to produce a current that closely approximates one half of the true short circuit current, IOS. 3 www.fairchildsemi.com DM74AS157 * DM74AS158 DM74AS157 Switching Characteristics over recommended operating free air temperature range 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 Conditions VCC = 4.5V to 5.5V, CL = 50 pF, RL = 500 From (Input) Data Data To (Output) Y Y Min 1 1 Max 6 5.5 Units ns ns STROBE Y 2 10.5 ns STROBE Select Select Y Y Y 2 2 2 7.5 11 10 ns ns ns DM74AS158 Switching Characteristics over recommended operating free air temperature range 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 Conditions VCC = 4.5V to 5.5V, CL = 50 pF, RL = 500 From (Input) Data Data To (Output) Y Y Min 1 1 Max 5 4.5 Units ns ns STROBE Y 2 6.5 ns STROBE Select Select Y Y Y 2 2 2 10 9.5 10.5 ns ns ns www.fairchildsemi.com 4 DM74AS157 * DM74AS158 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 DM74AS157 * DM74AS158 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 DM74AS157 * DM74AS158 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: 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 www.fairchildsemi.com |
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