DM74LS353 Dual 4-Input Multiplexer with TRI-STATEÉ Outputs General Description Features The ’353 is a dual 4-input multiplexer with TRI-STATE outputs. It can select two bits of data from four sources using common select inputs. The outputs may be individually switched to a high impedance state with a HIGH on the respective Output (OE) inputs, allowing the outputs to interface directly with bus oriented systems. It is fabricated with the Schottky barrier diode process for high speed and is completely compatible with all National TTL families. Y Connection Diagram Logic Symbol Y Y Inverted version of ’LS253 Schottky process for high speed Multifunction capability Dual-In-Line Package TL/F/10185 – 2 VCC e Pin 16 GND e Pin 8 TL/F/10185 – 1 Order Number DM74LS353M or DM74LS353N See NS Package Number M16A or N16E Pin Names I0a–I3a I0b–I3b S0, S1 OEa OEb Za, Zb Description Side A Data Inputs Side B Data Inputs Common Select Inputs Side A Output Enable Input (Active Low) Side B Output Enable Input (Active Low) TRI-STATE Outputs (Inverted) TRI-STATEÉ is a registered trademark of National Semiconductor Corporation. C1995 National Semiconductor Corporation TL/F/10185 RRD-B30M105/Printed in U. S. A. DM74LS353 Dual 4-Input Multiplexer with TRI-STATE Outputs February 1992 Absolute Maximum Ratings (Note) Supply Voltage 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 . 7V Input Voltage Operating Free Air Temperature Range Storage Temperature Range 7V 0§ C to a 70§ C b 65§ C to a 150§ C Recommended Operating Conditions Symbol Parameter VCC Supply Voltage VIH High Level Input Voltage VIL Low Level Input Voltage IOH High Level Output Current IOL Low Level Output Current TA Free Air Operating Temperature Min Nom Max 4.75 5 5.25 Units V 2 V 0.8 V b 2.6 mA 24 mA 70 §C 0 Electrical Characteristics over recommended operating free air temperature range (unless otherwise noted) Symbol Parameter Conditions Min Typ (Note 1) Max Units b 1.5 V VI Input Clamp Voltage VCC e Min, II e b18 mA VOH High Level Output Voltage VCC e Min, IOH e Max, VIL e Max VOL Low Level Output Voltage VCC e Min, IOL e Max, VIH e Min 0.5 IOL e 4 mA, VCC e Min 0.4 0.1 2.7 V V II Input Current @ Max Input Voltage VCC e Max, VI e 7V IIH High Level Input Current VCC e Max, VI e 2.7V 20 mA IIL Low Level Input Current VCC e Max, VI e 0.4V b 0.4 mA IOS Short Circuit Output Current VCC e Max (Note 2) b 130 mA ICCL Supply Current Outputs HIGH VCC e Max, In, Sn, OEn e GND 12 mA ICCZ Supply Current Outputs OFF VCC e Max, OEn e 4.5V In, Sn e GND 14 mA IOZH TRI–STATE Output OFF Current HIGH VCC e VCCH VOZH e 2.7V 20 mA IOZL TRI–STATE Output OFF Current LOW VCC e VCCH VOZL e 0.4V b 20 mA b 30 Note 1: All typicals are at VCC e 5V, TA e 25§ C. Note 2: Not more than one output should be shorted at a time, and the duration should not exceed one second. 2 mA Switching Characteristics VCC e a 5.0V, TA e a 25§ C Symbol RL e 2 kX, CL e 50 pF Parameter Min Units Max tPLH tPHL Propagation Delay Sn to Zn 24 32 ns tPLH tPHL Propagation Delay In to Zn 15 15 ns tPZH tPZL Output Enable Time OE to Zn 18 18 ns tPHZ tPLZ Output Disable Time OE to Zn 18 18 ns Functional Description If the outputs of TRI-STATE devices are tied together, all but one device must be in the high impedance state to avoid high currents that would exceed the maximum ratings. Designers should ensure that Output Enable signals to TRISTATE devices whose outputs are tied together are designed so that there is no overlap. The ’LS353 contains two identical 4-input multiplexers with TRI-STATE outputs. They select two bits from four sources selected by common Select inputs (S0, S1). The 4-input multiplexers have individual Output Enable (OEa), OEb) inputs which when HIGH, force the outputs to a high impedance (high Z) state. The logic equations for the outputs are shown below: Za e OEa # (I0a # S1 # S0 a I1a # S1 # S0 a I2a # S1 # S0 a I3a # S1 # S0) Zb e OEb # (I0b # S1 # S0 a I1b # S1 # S0 a I2b # S1 # S0 a I3b # S1 # S0) Truth Table Select Inputs Output Enable Data Inputs Output S0 S1 I0 I1 I2 I3 OE Z X L L H X L L L X L H X X X X L X X X X X X X X H L L L (Z) H L H H L L H H L H H H H X X X X X H X X X X X L H X X X X X L H L L L L L L H L H L Address inputs S0 and S1 are common to both sections. H e HIGH Voltage Level L e LOW Voltage Level X e Immaterial (Z) e High Impedance 3 Logic Diagram TL/F/10185 – 3 4 Physical Dimensions inches (millimeters) 16-Lead Small Outline Molded Package (M) Order Number DM74LS353M NS Package Number M16A 5 DM74LS353 Dual 4-Input Multiplexer with TRI-STATE Outputs Physical Dimensions inches (millimeters) (Continued) 16-Lead Molded Dual-In-Line Package (N) Order Number DM74LS353N NS Package Number N16E 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. As used herein: 1. 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