DM74LS40 Dual 4-Input NAND Buffer General Description This device contains two independent gates each of which perform the logic NAND function. Connection Diagrams Dual-In-Line Package TL/F/10171 – 1 Order Number DM74LS40M or DM74LS40N See NS Package Number M14A or N14A Function Table (Each Gate) Inputs Outputs A B C D Y H L X X X H X L X X H X X L X H X X X L L H H H H Logic Diagram (Each Gate) TL/F/10171 – 2 Positive Logic Y e A # B # C # D or Y e A a B a C a D C1995 National Semiconductor Corporation TL/F/10171 RRD-B30M105/Printed in U. S. A. DM74LS40 Dual 4-Input NAND Buffer February 1992 Absolute Maximum Ratings (Note) Supply Voltage 7V Input Voltage 7V Operating Free Air Temperature Range DM74LS Storage Temperature Range 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. 0§ C to a 70§ C b 65§ C to a 150§ C Recommended Operating Conditions Symbol DM74LS40 Parameter VCC Supply Voltage VIH High Level Input Voltage VIL Low Level Input Voltage Units Min Nom Max 4.75 5 5.25 V 2 V 0.8 V mA IOH High Level Output Current b 1.2 IOL Low Level Output Current 24 mA TA Free Air Operating Temperature 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 12 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 ICCH Supply Current with Outputs High VCC e Max, VIN e GND 1.0 mA ICCL Supply Current with Outputs Low VCC e Max, VIN e OPEN 6.0 mA b 30 Note 1: All typicals are at VCC e 5V, TA e 25§ C. Note 2: Note 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 15 pF Parameter Min Units Max tPLH Propagation Delay Time Low to High Level Output 24 ns tPHL Propagation Delay Time High to Low Level Output 24 ns Physical Dimensions inches (millimeters) 14-Lead Small Outline Molded Package (M) Order Number DM74LS40M NS Package Number M14A 3 DM74LS40 Dual 4-Input NAND Buffer Physical Dimensions inches (millimeters) (Continued) 14-Lead Molded Dual-In-Line Package (N) Order Number DM74LS40N NS Package Number N14A 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 systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, and whose failure to perform, when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury to the user. National Semiconductor Corporation 1111 West Bardin Road Arlington, TX 76017 Tel: 1(800) 272-9959 Fax: 1(800) 737-7018 2. A critical component is any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. National Semiconductor Europe Fax: (a49) 0-180-530 85 86 Email: cnjwge @ tevm2.nsc.com Deutsch Tel: (a49) 0-180-530 85 85 English Tel: (a49) 0-180-532 78 32 Fran3ais Tel: (a49) 0-180-532 93 58 Italiano Tel: (a49) 0-180-534 16 80 National Semiconductor Hong Kong Ltd. 13th Floor, Straight Block, Ocean Centre, 5 Canton Rd. Tsimshatsui, Kowloon Hong Kong Tel: (852) 2737-1600 Fax: (852) 2736-9960 National Semiconductor Japan Ltd. Tel: 81-043-299-2309 Fax: 81-043-299-2408 National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications.