54LS244/DM74LS244 Octal TRI-STATEÉ Buffers/Line Drivers/Line Receivers Y General Description 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. Y Y Y Y Features 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 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 Connection Diagram Dual-In-Line Package TL/F/8442 – 1 Order Number 54LS244DMQB, 54LS244FMQB, 54LS244LMQB, DM74LS244WM or DM74LS244N See NS Package Number E20A, J20A, M20B, N20A or W20A Function Table Inputs Output G A Y L L H L H X 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/8442 RRD-B30M105/Printed in U. S. A. 54LS244/DM74LS244 Octal TRI-STATE Buffers/Line Drivers/Line Receivers August 1989 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 54LS DM74LS 0§ C to a 70§ C b 65§ C to a 150§ C Storage Temperature Range Recommended Operating Conditions Symbol 54LS244 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 DM74LS244 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 Typ (Note 1) Max Units b 1.5 V 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 54LS/DM74 VCC e Min, VIH e Min VIL e 0.5V, IOH e Max 54LS/DM74 VCC e Min VIL e Max VIH e Min IOL e 12 mA 54LS/DM74 0.4 IOL e Max DM74 0.5 V VO e 2.7V 20 mA VO e 0.4V b 20 mA 0.1 mA VOL Low Level Output Voltage IOZH Off-State Output Current, High Level Voltage Applied IOZL Off-State Output Current, Low Level Voltage Applied II Input Current at Maximum Input Voltage VCC e Max VI e 7V (DM74) VI e 10V (54LS) IIH High Level Input Current VCC e Max VI e 2.7V Low Level Input Current VCC e Max VI e 0.4V IIL IOS ICC Short Circuit Output Current Supply Current VCC e Max VIL e Max VIH e Min 0.2 VCC e Max (Note 2) VCC e Max, Outputs Open 0.4 V 3.4 V 2.7 2.4 2 b 0.5 54LS b 50 DM74 b 40 20 mA b 200 mA b 225 mA Outputs High 13 23 Outputs Low 27 46 Outputs Disabled 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 mA Switching Characteristics at VCC e 5V, TA e 25§ C (see Section 1 for Test Waveforms and Output Load) Parameter Conditions 54LS Max DM74LS Max Units tPLH Symbol Propagation Delay Time Low to High Level Output CL e 45 pF RL e 667X 18 18 ns tPHL Propagation Delay Time High to Low Level Output CL e 45 pF RL e 667X 18 18 ns tPZL Output Enable Time to Low Level CL e 45 pF RL e 667X 30 30 ns tPZH Output Enable Time to High Level CL e 45 pF RL e 667X 23 23 ns tPLZ Output Disable Time from Low Level CL e 5 pF RL e 667X 25 25 ns tPHZ Output Disable Time from High Level CL e 5 pF RL e 667X 18 18 ns tPLH Propagation Delay Time Low to High Level Output CL e 150 pF RL e 667X 21 ns tPHL Propagation Delay Time High to Low Level Output CL e 150 pF RL e 667X 22 ns tPZL Output Enable Time to Low Level CL e 150 pF RL e 667X 33 ns tPZH Output Enable Time to High Level CL e 150 pF RL e 667X 26 ns Note: 54LS Output Load is CL e 50 pF for tPLH, tPHL, tPZL and tPZH. 3 Physical Dimensions inches (millimeters) Ceramic Leadless Chip Carrier Package (E) Order Number 54LS244LMQB NS Package Number E20A 20-Lead Ceramic Dual-In-Line Package (J) Order Number 54LS244DMQB NS Package Number J20A 4 Physical Dimensions inches (millimeters) (Continued) 20-Lead Wide Small Outline Molded Package (M) Order Number DM74LS244WM NS Package Number M20B 20-Lead Molded Dual-In-Line Package (N) Order Number DM74LS244N NS Package Number N20A 5 54LS244/DM74LS244 Octal TRI-STATE Buffers/Line Drivers/Line Receivers Physical Dimensions inches (millimeters) (Continued) 20-Lead Ceramic Flat Package (W) Order Number 54LS244FMQB 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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