74LS245

74LS245 NSC | Alldatasheet

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Y Bi-Directional bus transceiver in a high-density 20-pin package Y TRI-STATE outputs drive bus lines directly Y PNP inputs reduce DC loading on bus lines Y Hysteresis at bus inputs improve noise margins Y Typical propagation delay times, port-to-port 8 ns Y Typical enable/disable times 17 ns Y IOL (sink current) 54LS 12 mA 74LS 24 mA Y IOH (source current) 54LS b12 mA 74LS b15 mA Y Alternate Military/Aerospace device (54LS245) is avail- able. Contact a National Semiconductor Sales Office/ Distributor for specifications. Connection Diagram Dual-In-Line Package TL/F/6413–1 Order Number 54LS245DMQB, 54LS245FMQB, 54LS245LMQB, DM54LS245J, DM54LS245W, DM74LS245WM or DM74LS245N See NS Package Number E20A, J20A, M20B, N20A or W20A Function Table Enable Direction Operation G Control DIR L L B data to A bus L H A data to B bus H X Isolation H e High Level, L e Low Level, X e Irrelevant TRI-STATEÉ is a registered trademark of National Semiconductor Corporation. C1995 National Semiconductor Corporation RRD-B30M105/Printed in U. S. A.

Absolute Maximum Ratings (Note) If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/Distributors for availability and specifications. Supply Voltage 7V Input Voltage DIR or G A or B 5.5V Operating Free Air Temperature Range DM54LS and 54LS b55§Ct o a125§C DM74LS 0 §Ct o a70§C Storage Temperature Range b65§Ct o a150§C Note: The ‘‘Absolute Maximum Ratings’’ are those values beyond which the safety of the device cannot be guaran- teed. 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. Recommended Operating Conditions Symbol Parameter DM54LS245 DM74LS245 Units Min Nom Max Min Nom Max VCC Supply Voltage 4.5 5 5.5 4.75 5 5.25 V VIH High Level Input Voltage 2 2 V VIL Low Level Input Voltage 0.7 0.8 V IOH High Level Output Current b12 b15 mA IOL Low Level Output Current 12 24 mA TA Free Air Operating Temperature b55 125 0 70 §C Electrical Characteristics over recommended operating free air temperature range (unless otherwise noted) Symbol Parameter Conditions Min Typ Max Units(Note 1) VI Input Clamp Voltage V CC e Min, I I eb 18 mA b1.5 V HYS Hysteresis (V Ta b VTb)V CC e Min 0.2 0.4 V VOH High Level Output Voltage V CC e Min, V IH e Min DM74 2.7VIL e Max, I OH eb 1m A VCC e Min, V IL e Min DM54/DM74 2.4 3.4 VVIL e Max, I OH eb 3m A VCC e Min, V IH e Min DM54/DM74 2VIL e 0.5V, I OH e Max VOL Low Level Output Voltage V CC e Min I OL e 12 mA DM74 0.4 VIL e Max IOL e Max DM54 0.4 VVIH e Min DM74 0.5 IOZH Off-State Output Current, V CC e Max V O e 2.7V 20 mAHigh Level Voltage Applied V IL e Max IOZL Off-State Output Current, VIH e Min VO e 0.4V b200 mALow Level Voltage Applied II Input Current at Maximum V CC e M a x Ao rB V I e 5.5V 0.1 mAInput Voltage DIR or G VI e 7V 0.1 IIH High Level Input Current V CC e Max, V I e 2.7V 20 mA IIL Low Level Input Current V CC e Max, V I e 0.4V b0.2 mA IOS Short Circuit Output Current V CC e Max (Note 2) b40 b225 mA ICC Supply Current Outputs High V CC e Max 48 70 Outputs Low 62 90 mA Outputs at Hi-Z 64 95 Note 1: All typicals are at V CC e 5V, T A e 25§C. Note 2: Not more than one output should be shorted at a time, not to exceed one second duration

Switching Characteristics VCC e 5V, T A e 25§C (See Section 1 for Test Waveforms and Output Load) DM54/74 Symbol Parameter Conditions LS245 Units Min Max tPLH Propagation Delay Time, Low-to-High-Level Output 12 ns tPHL Propagation Delay Time, High-to-Low-Level Output C L e 45 pF 12 ns tPZL Output Enable Time to Low Level RL e 667X 40 ns tPZH Output Enable Time to High Level 40 ns tPLZ Output Disable Time from Low Level C L e 5p F 2 5 n s tPHZ Output Disable Time from High Level RL e 667X 25 ns tPLH Propagation Delay Time, Low-to-High-Level Output 16 ns tPHL Propagation Delay Time, High-to-Low-Level Output C L e 150 pF 17 ns tPZL Output Enable Time to Low Level RL e 667X 45 ns tPZH Output Enable Time to High Level 45 ns

Physical Dimensions inches (millimeters) Ceramic Leadless Chip Carrier Package (E) Order Number 54LS245LMQB 20-Lead Ceramic Dual-In-Line Package (J) Order Number 54LS245DMQB or DM54LS245J

Physical Dimensions inches (millimeters) (Continued) 20-Lead Small Outline Molded Package (M) Order Number DM74LS245WM 20-Lead Molded Dual-In-Line Package (N) Order Number DM74LS245N

54LS245/DM54LS245/DM74LS245 TRI-STATE Octal Bus Transceiver Physical Dimensions inches (millimeters) (Continued) 20-Lead Ceramic Flat Package (W) Order Number 54LS245FMQB or DM54LS245W 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. Life support devices or systems are devices or 2. A critical component is any component of a life systems which, (a) are intended for surgical implant support device or system whose failure to perform can into the body, or (b) support or sustain life, and whose be reasonably expected to cause the failure of the life failure to perform, when properly used in accordance support device or system, or to affect its safety or with instructions for use provided in the labeling, can effectiveness. be reasonably expected to result in a significant injury to the user. National Semiconductor National Semiconductor National Semiconductor National Semiconductor Corporation Europe Hong Kong Ltd. Japan Ltd.

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