DM7427 Triple 3-Input NOR Gates General Description This device contains three independent gates each of which performs the logic NOR function. Connection Diagram Dual-In-Line Package TL/F/6509 – 1 Order Number DM7427N See NS Package Number N14A Function Table YeAaBaC Inputs Output A B C Y L X X H L X H X L H X X H L L L H e High Logic Level L e Low Logic Level X e Either High or Low Logic Level C1995 National Semiconductor Corporation TL/F/6509 RRD-B30M105/Printed in U. S. A. DM7427 Triple 3-Input NOR Gates June 1989 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 5.5V Operating Free Air Temperature Range DM74 Storage Temperature Range 0§ C to a 70§ C b 65§ C to a 150§ C Recommended Operating Conditions Symbol DM7427 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 0.8 IOL Low Level Output Current 16 mA TA Free Air Operating Temperature 70 §C 0 Electrical Characteristics over recommended operating free air temperature range (unless otherwise noted) Symbol Parameter Conditions Typ (Note 1) Min Max Units b 1.5 V VI Input Clamp Voltage VCC e Min, II e b12 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 II Input Current @ Max Input Voltage VCC e Max, VI e 5.5V IIH High Level Input Current VCC e Max, VI e 2.4V 40 mA IIL Low Level Input Current VCC e Max, VI e 0.4V b 1.6 mA IOS Short Circuit Output Current VCC e Max (Note 2) b 57 mA ICCH Supply Current with Outputs High VCC e Max 10 16 mA ICCL Supply Current with Outputs Low VCC e Max 16 26 mA 2.4 3.4 V 0.2 b 18 0.4 V 1 mA Switching Characteristics at VCC e 5V and TA e 25§ C (See Section 1 for Test Waveforms and Output Load) Symbol Parameter Conditions tPLH Propagation Delay Time Low to High Level Output CL e 15 pF RL e 400X tPHL Propagation Delay Time High to Low Level Output 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. 2 Min Max Units 11 ns 15 ns 3 DM7427 Triple 3-Input NOR Gates Physical Dimensions inches (millimeters) 14-Lead Molded Dual-In-Line Package (N) Order Number DM7427N 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.