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DM74ALS157 * DM74ALS158 Quad 1-of-2 Line Data Selector/Multiplexer
April 1984 Revised February 2000
DM74ALS157 * DM74ALS158 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 ALS157 presents true data whereas the ALS158 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 and low power Schottky TTL counterpart s Improved AC performance over Schottky and 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 DM74ALS157M DM74ALS157SJ DM74ALS157N DM74ALS158N Package Number M16A M16D N16E 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 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 X L L H H A X L H X X B X X X L H L L H L H Output Y DM74ALS157 DM74ALS158 H H L H L
H = HIGH Level L = LOW Level X = Don't Care
(c) 2000 Fairchild Semiconductor Corporation
DS006205
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DM74ALS157 * DM74ALS158
Logic Diagrams
DM74ALS157
DM74ALS158
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DM74ALS157 * DM74ALS158
Absolute Maximum Ratings(Note 1)
Supply Voltage Input Voltage Operating Free Air Temperature Range Storage Temperature Range 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 -0.4 8 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 ICC Parameter Input Clamp Voltage HIGH Level Output Voltage LOW Level Output Voltage Input Current @ Maximum Input Voltage HIGH Level Input Current LOW Level Input Current Output Drive Current Supply Current VCC = 5.5V, VIH = 7V VCC = 5.5V, VIH = 2.7V VCC = 5.5V, VIL = 0.4V VCC = 5.5V VCC = 5.5V All Inputs = 4.5V VO = 2.25V DM74ALS157 DM74ALS158 -30 6 5 Conditions VCC = 4.5V, II = -18 mA IOH = -0.4 mA, VCC = 4.5V to 5.5V VCC = 4.5V IOL = 4 mA IOL = 8 mA VCC - 2 0.25 0.35 0.4 0.5 0.1 20 -0.1 -112 11 10 Min Typ Max -1.2 Units V V V V mA A mA mA mA mA
Switching Characteristics
over recommended operating free air temperature range. From (Input) Symbol Parameter 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 Select to Y Strobe to Y Data to Y Conditions VCC = 4.5V to 5.5V CL = 50 pF RL = 500 DM74ALS157 Min 3 2 6 4 7 4 Max 14 12 20 13 24 14 DM74ALS158 Min 3 1 5 5 5 5 Max 15 8 18 18 19 18 Units ns ns ns ns ns ns
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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
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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
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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: 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 6 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

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