DM54LS273/DM74LS273 8-Bit Register with Clear General Description Features The ’LS273 is a high speed 8-bit register, consisting of eight D-type flip-flops with a common Clock and an asynchronous active LOW Master Reset. This device is supplied in a 20pin package featuring 0.3 inch row spacing. Y Y Y Y Edge-triggered 8-bit high speed register Parallel in and out Common clock and master reset Connection Diagram Dual-In-Line Package TL/F/9825 – 1 Order Number DM54LS273E, DM54LS273J, DM54LS273W, DM74LS273M or DM74LS273N See NS Package Number E20A, J20A, M20B, N20A or W20A Pin Names CP D0–D7 MR Q0–Q7 C1995 National Semiconductor Corporation TL/F/9825 Description Clock Pulse Input (Active Rising Edge) Data Inputs Asynchronous Master Reset Input (Active LOW) Flip-Flop Outputs RRD-B30M115/Printed in U. S. A. DM54LS273/DM74LS273 8-Bit Register with Clear April 1992 Absolute Maximum Ratings (Note) 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. If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/Distributors for availability and specifications. Supply Voltage 7V Input Voltage 7V Operating Free Air Temperature Range b 55§ C to a 125§ C DM54LS DM74LS 0§ C to a 70§ C b 65§ C to a 150§ C Storage Temperature Range Recommended Operating Conditions Symbol DM54LS273 Parameter DM74LS273 Units Min Nom Max Min Nom Max 4.5 5 5.5 4.75 5 5.25 VCC Supply Voltage VIH High Level Input Voltage VIL Low Level Input Voltage IOH High Level Output Current IOL Low Level Output Current TA Free Air Operating Temperature ts(H) ts(L) Setup Time HIGH or LOW Dn to CP 15 15 15 15 ns th(H) th(L) Hold Time HIGH or LOW Dn to CP 5 5 5 5 ns tw(H) tw(L) CP Pulse Width HIGH or LOW 20 20 20 20 ns tw(L) MR Pulse Width LOW 20 20 ns trec Recovery Time MR to CP 15 15 ns 2 2 V 0.7 0.8 V b 0.4 b 0.4 mA 8 mA 70 §C 4 b 55 V 125 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 DM54 2.5 DM74 2.7 Low Level Output Voltage VCC e Min, IOL e Max, VIH e Min DM74 0.35 0.5 IOL e 4 mA, VCC e Min DM74 0.25 0.4 VOL V 3.4 DM54 0.4 V II Input Current @ Max Input Voltage VCC e Max, VI e 7V VI e 10V (DM54) 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) Supply Current VCC e Max ICC 0.1 DM54 b 20 b 100 DM74 b 20 b 100 27 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, and the duration should not exceed one second. 2 mA mA mA Switching Characteristics VCC e a 5.0V, TA e a 25§ C CL e 15 pF Symbol Parameter DM74LS DM54LS Units RL e 2 kX Min Max Min 30 Max fmax Maximum Clock Frequency 30 tPLH tPHL Propagation Delay CP to Qn 24 24 24 24 ns tPLH Propagation Delay MR to Qn 27 27 ns Functional Description MHz Truth Table The ’LS273 is an 8-bit parallel register with a common Clock and common Master Reset. When the MR input is LOW, the Q outputs are LOW, independent of the other inputs. Information meeting the setup and hold time requirements of the D inputs is transferred to the Q outputs on the LOW-toHIGH transition of the clock input. MR Inputs CP Dn Outputs Qn L H H X L L X H L L H L H e HIGH Voltage Level L e LOW Voltage Level X e Immaterial Logic Symbol TL/F/9825 – 2 VCC e Pin 20 GND e Pin 10 Logic Diagram TL/F/9825 – 3 3 Physical Dimensions inches (millimeters) Ceramic Leadless Chip Carrier Package (E) Order Number DM54LS273E NS Package Number E20A 20-Lead Ceramic Dual-In-Line Package (J) Order Number DM54LS273J NS Package Number J20A 4 Physical Dimensions inches (millimeters) (Continued) 20-Lead Wide Small Outline Molded Package (M) Order Number DM74LS273M NS Package Number M20B 20-Lead Molded Dual-In-Line Package (N) Order Number DM74LS273N NS Package Number N20A 5 DM54LS273/DM74LS273 8-Bit Register with Clear Physical Dimensions inches (millimeters) (Continued) 20-Lead Ceramic Flat Package (W) Order Number DM54LS273W NS Package Number W20A 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. 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