DM74279

DM74279 NSC | Alldatasheet

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54279/DM74279 Quad Set-Reset Latch June 1989 54279/DM74279 Quad Set-Reset Latch General Description This device contains four independent set-reset type flip- flops with one Q output each. Connection Diagram Dual-In-Line Package TL/F/9785–1 Order Number 54279DMQB, 54279FMQB or DM74279N Pin Names Description Rn Reset Inputs (Active Low) Sn Set Inputs (Active Low) Q Outputs Truth Table Inputs Output S1S 2R Q LL L h LX H H XL H H HH L L H H H No Change H e HIGH Voltage Level L e LOW Voltage Level X e Immaterial h e The output is HIGH as long as S 1o rS 2 is LOW. If all inputs go HIGH simultaneously, the output state is indeterminate; otherwise, it follows the Truth Table. C1995 National Semiconductor Corporation RRD-B30M115/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 5.5V Operating Free Air Temperature Range b55§Ct o a125§C DM74 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 54279 DM74279 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 0.8 0.8 V IOH High Level Output Current b0.8 b0.8 mA IOL Low Level Output Current 16 16 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 12 mA b1.5 V VOH High Level V CC e Min, I OH e Max, 2.4 3.4 VOutput Voltage V IL e Max VOL Low Level V CC e Min, I OL e Max, 0.2 0.4 VOutput Voltage V IH e Min II Input Current @ Max V CC e Max, V I e 5.5V 1m AInput Voltage IIH High Level Input Current V CC e Max, V I e 2.4V 40 mA IIL Low Level Input Current V CC e Max, V I e 0.4V b1.6 mA IOS Short Circuit V CC e Max 54 b20 b55 mAOutput Current (Note 2) DM74 b18 b57 ICC Supply Current V CC e Max, R e 0V 30 mA Switching Characteristics Symbol Parameter 54/DM74 Units Min Max tPLH Propagation Delay 22 nstPHL S to Q 15 tPHL Propagation Delay 27 nsR to Q 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.

Physical Dimensions inches (millimeters) 16-Lead Ceramic Dual-In-Line Package (J) Order Number 54279DMQB 16-Lead Molded Dual-In-Line Package (N) Order Number DM74279N

54279/DM74279 Quad Set-Reset Latch Physical Dimensions inches (millimeters) (Continued) 16-Lead Ceramic Flat Package (W) Order Number 54279FMQB 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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