54LS157,54LS158,DM54LS157,DM54LS158, DM74LS157,DM74LS158 54LS157 DM54LS157 DM74LS157 54LS158 DM54LS158 DM74LS158 Quad 2-Line to 1-Line Data Selectors/Multiplexers Literature Number: SNOS285A
54LS157/DM54LS157/DM74LS157, 54LS158/DM54LS158/DM74LS158 Quad 2-Line to 1-Line Data Selectors/Multiplexers 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 LS157 presents true data whereas the LS158 presents inverted data to minimize propagation delay time.
Absolute Maximum Ratings (Note) Note: 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’’ table are not guaranteed at the absolute maximum ratings. The ‘‘Recommended Operating Conditions’’ table will define the conditions for actual device operation.
’LS157 Switching Characteristics at VCC e 5V and TA e 25§ C (See Section 1 for Test Waveforms and Output Load) Symbol RL e 2 kX From (Input) To (Output) Parameter CL e 15 pF Min CL e 50 pF Max Min Units Max Propagation Delay Time Low to High Level Output Data to Y 14 18 ns tPHL Propagation Delay Time High to Low Level Output Data to Y 14 23 ns tPLH Propagation Delay Time Low to High Level Output Strobe to Y 20 24 ns tPHL Propagation Delay Time High to Low Level Output Strobe to
’LS158 Switching Characteristics at VCC e 5V and TA e 25§ C (See Section 1 for Test Waveforms and Output Load) Symbol Parameter From (Input) To (Output) RL e 2 kX CL e 15 pF Min Max CL e 50 pF Min Units Max Propagation Delay Time Low to High Level Output Data to Y 12 18 ns tPHL Propagation Delay Time High to Low Level Output Data to Y 12 21 ns tPLH Propagation Delay Time Low to High Level Output Strobe to Y 17 23 ns tPHL Propagation Delay Time High to Low Level Output Strobe to Y
5 e et bs ol O
et e Physical Dimensions inches (millimeters) O bs ol Ceramic Leadless Chip Carrier Package (E) Order Number 54LS157LMQB or 54LS158LMQB NS Package Number E20A 16-Lead Ceramic Dual-In-Line Package (J) Order Number 54LS157DMQB, 54LS158DMQB, DM54LS157J or DM54LS158J NS Package Number J16A 6
et e Physical Dimensions inches (millimeters) (Continued) O bs ol 16-Lead Small Outline Molded Package (M) Order Number DM74LS157M or DM74LS158M NS Package Number M16A 16-Lead Molded Dual-In-Line Package (N) Order Number DM74LS157N or DM74LS158N NS Package Number N16E 7
e et bs ol 16-Lead Ceramic Flat Package (W) Order Number 54LS157FMQB, 54LS158FMQB, DM54LS157W or DM54LS158W NS Package Number W16A LIFE SUPPORT POLICY NATIONAL’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 NATIONAL SEMICONDUCTOR CORPORATION.
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