DM54LS240/DM74LS240, DM54LS241/DM74LS241 Octal TRI-STATEÉ Buffers/Line Drivers/Line Receivers These buffers/line drivers are designed to improve both the performance and PC board density of TRI-STATE buffers/ drivers employed as memory-address drivers, clock drivers, and bus-oriented transmitters/receivers. Featuring 400 mV of hysteresis at each low current PNP data line input, they provide improved noise rejection and high fanout outputs and can be used to drive terminated lines down to 133X. Features Y Y Y Typical IOL (sink current) 54LS 12 mA 74LS 24 mA Typical IOH (source current) b 12 mA 54LS b 15 mA 74LS Typical propagation delay times Inverting 10.5 ns Noninverting 12 ns Typical enable/disable time 18 ns Typical power dissipation (enabled) Inverting 130 mW Noninverting 135 mW Y General Description Y Y Y TRI-STATE outputs drive bus lines directly PNP inputs reduce DC loading on bus lines Hysteresis at data inputs improves noise margins Y Connection Diagrams Dual-In-Line Package Dual-In-Line Package TL/F/6411 – 1 TL/F/6411 – 2 Order Number DM54LS241J, DM54LS241W, DM54LS241E, DM74LS241WM or DM74LS241N See NS Package Number E20A, J20A, M20B, N20A or W20A Order Number DM54LS240J, DM54LS240W, DM54LS240E, DM74LS240WM or DM74LS240N See NS Package Number E20A, J20A, M20B, N20A or W20A Function Tables LS240 LS241 Inputs Output Inputs Outputs G A Y G G 1A 2A 1Y L L H L H X H L Z X X X H H L L L H X X X L H X X X X X X X L H X L H Z 2Y L H Z L e Low Logic Level H e High Logic Level X e Either Low or High Logic Level Z e High Impedance TRI-STATEÉ is a registered trademark of National Semiconductor Corporation. C1995 National Semiconductor Corporation TL/F/6411 RRD-B30M105/Printed in U. S. A. DM54LS240/DM74LS240, DM54LS241/DM74LS241 Octal TRI-STATE Buffers/Line Drivers/Line Receivers April 1992 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. If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/Distributors for availability and specifications. Supply Voltage 7V Input Voltage 7V Operating Free Air Temperature Range b 55§ C to a 125§ C DM54LS, 54LS DM74LS 0§ C to a 70§ C b 65§ C to a 150§ C Storage Temperature Range Recommended Operating Conditions Symbol DM54LS240, 241 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 DM74LS240, 241 Units Min Nom Max Min Nom Max 4.5 5 5.5 4.75 5 5.25 2 V 2 V 0.7 0.8 V b 12 b 15 mA 24 mA 70 §C 12 b 55 125 0 Electrical Characteristics over recommended operating free air temperature range (unless otherwise noted) Symbol Parameter Conditions Min VI Input Clamp Voltage VCC e Min, II e b18 mA HYS Hysteresis (VT a b VTb) Data Inputs Only VCC e Min VOH High Level Output Voltage VCC e Min, VIH e Min VIL e Max, IOH e b1 mA DM74 VCC e Min, VIH e Min VIL e Max, IOH e b3 mA DM54/DM74 VCC e Min, VIH e Min VIL e 0.5V, IOH e Max DM54/DM74 VOL IOZH IOZL Low Level Output Voltage Typ Max Units (Note 1) b 1.5 0.2 VCC e Min VIL e Max VIH e Min IOL e 12 mA IOL e Max Off-State Output Current, VCC e Max High Level Voltage Applied VIL e Max VIH e Min Off-State Output Current, V 0.4 V 3.4 V 2.7 2.4 2 DM74 0.4 DM54 0.4 DM74 0.5 V VO e 2.7V 20 mA VO e 0.4V b 20 mA 0.1 mA Low Level Voltage Applied II Input Current at Maximum Input Voltage VCC e Max, VI e 7V (DM74) VI e 10V (DM54) 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 0.2 mA IOS Short Circuit Output Current VCC e Max (Note 2) b 225 mA ICC Supply Current b 40 VCC e Max, Outputs Open Outputs High Outputs Low LS240, LS241 23 LS240 26 44 LS241 27 46 Outputs Disabled LS240 29 50 LS241 32 54 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 13 mA Switching Characteristics at VCC e 5V and TA e 25§ C Symbol tPLH tPHL tPZL tPZH tPLZ tPHZ tPLH tPHL tPZL tPZH Parameter Conditions DM54LS DM74LS Max Max Propagation Delay Time Low to High Level Output CL e 45 pF RL e 667X LS240 18 14 LS241 18 18 Propagation Delay Time High to Low Level Output CL e 45 pF RL e 667X LS240 18 18 LS241 18 18 Output Enable Time to Low Level CL e 45 pF RL e 667X LS240 30 30 LS241 30 30 Output Enable Time to High Level CL e 45 pF RL e 667X LS240 23 23 LS241 23 23 Output Disable Time from Low Level CL e 5 pF RL e 667X LS240 25 25 LS241 25 25 Output Disable Time from High Level CL e 5 pF RL e 667X LS240 18 18 LS241 18 18 Propagation Delay Time Low to High Level Output CL e 150 pF RL e 667X LS240 18 LS241 21 Propagation Delay Time High to Low Level Output CL e 150 pF RL e 667X LS240 22 LS241 22 Output Enable Time to Low Level CL e 150 pF RL e 667X LS240 33 LS241 33 Output Enable Time to High Level CL e 150 pF RL e 667X LS240 26 LS241 26 Note: 54LS Output load is CL e 50 pF for tPLH, tPHL, tPZL and tPZH. 3 Units ns ns ns ns ns ns ns ns ns ns Physical Dimensions inches (millimeters) Ceramic Leadless Chip Carrier Package (E) Order Number DM54LS240E or DM54LS241E NS Package Number E20A 20-Lead Ceramic Dual-In-Line Package (J) Order Number DM54LS240J or DM54LS241J NS Package Number J20A 4 Physical Dimensions inches (millimeters) (Continued) 20-Lead Wide Small Outline Molded Package (M) Order Number DM74LS240WM or DM74LS241WM NS Package Number M20B 20-Lead Molded Dual-In-Line Package (N) Order Number DM74LS240N or DM74LS241N NS Package Number N20A 5 DM54LS240/DM74LS240, DM54LS241/DM74LS241 Octal TRI-STATE Buffers/Line Drivers/Line Receivers Physical Dimensions inches (millimeters) (Continued) 20-Lead Ceramic Flat Package (W) Order Number DM54LS240W or DM54LS241W NS Package Number W20A 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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