Revised March 2000 DM74LS28 Quad 2-Input NOR Buffer General Description The DM74LS28 contains four independent gates each of which perform the logic NOR function. Ordering Code: Order Number DM74LS28M Package Number M14A Package Description 14-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-120, 0.150 Narrow Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code. Connection Diagram Truth Table Y = A+B Inputs Output A B Y L L H L H L H L L H H L H = HIGH logic level L = LOW logic level © 2000 Fairchild Semiconductor Corporation DS010169 www.fairchildsemi.com DM74LS28 Quad 2-Input NOR Buffer March 1989 DM74LS28 Absolute Maximum Ratings(Note 1) Supply Voltage Note 1: 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 tables are not guaranteed at the absolute maximum ratings. The “Recommended Operating Conditions” table will define the conditions for actual device operation. 7V Input Voltage 7V 0°C to +70°C Operating Free Air Temperature Range −65°C to +150°C Storage Temperature Range Recommended Operating Conditions Symbol Parameter Min Nom Max Units 4.75 5 5.25 V VCC Supply Voltage VIH HIGH Level Input Voltage VIL LOW Level Input Voltage 0.7 V IOH HIGH Level Output Current −1.2 mA IOL LOW Level Output Current 24 mA TA Free Air Operating Temperature 70 °C 2 V 0 Electrical Characteristics over recommended operating free air temperature range (unless otherwise noted) Symbol Parameter Conditions Min Typ (Note 2) Max VI Input Clamp Voltage VCC = Min, II = −18 mA VOH HIGH Level Output Voltage VCC = Min, IOH = Max, VIL = Max VOL LOW Level Output Voltage VCC = Min, IOL = Max, VIH = Min 0.5 IOL = 12 mA, VCC = Min 0.4 Units −1.5 V 2.7 V V II Input Current @ Max Input Voltage VCC = Max, VI = 7V 0.1 IIH HIGH Level Input Current VCC = Max, VI = 2.7V 20 µA IIL LOW Level Input Current VCC = Max, VI = 0.4V −0.4 mA IOS Short Circuit Output Current VCC = Max (Note 3) −130 mA ICCH Supply Current with Outputs HIGH VCC = Max 3.6 mA ICCL Supply Current with Outputs LOW VCC = Max 13.8 mA −30 mA Note 2: All typicals are at VCC = 5V, TA = 25°C. Note 3: Not more than one output should be shorted at a time, and the duration should not exceed one second. Switching Characteristics VCC = +5.0V, TA = +25°C RL = 2 kΩ Symbol CL = 15 pF Parameter Min tPLH Propagation Delay Time LOW-to-HIGH Level Output tPHL Propagation Delay Time HIGH-to-LOW Level Output www.fairchildsemi.com 2 Units Max 20 ns 20 ns DM74LS28 Quad 2-Input NOR Buffer Physical Dimensions inches (millimeters) unless otherwise noted 14-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-120, 0.150 Narrow Package Number M14A Fairchild does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and Fairchild reserves the right at any time without notice to change said circuitry and specifications. LIFE SUPPORT POLICY FAIRCHILD’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 FAIRCHILD SEMICONDUCTOR CORPORATION. As used herein: 2. A critical component in 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. 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 (c) 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. www.fairchildsemi.com 3 www.fairchildsemi.com