74LS273

DM54LS273 DM74LS273 8-Bit Register with Clear April 1992 DM54LS273 DM74LS273 8-Bit Register with Clear General Description 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 Features 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 Description Clock Pulse Input (Active Rising Edge) Data Inputs Asynchronous Master Reset Input (Active LOW) Flip-Flop Outputs C1995 National Semiconductor Corporation TL F 9825 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 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 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 Recommended Operating Conditions Symbol VCC VIH VIL IOH IOL TA ts(H) ts(L) th(H) th(L) tw(H) tw(L) tw(L) trec Parameter Min Supply Voltage High Level Input Voltage Low Level Input Voltage High Level Output Current Low Level Output Current Free Air Operating Temperature Setup Time HIGH or LOW Dn to CP Hold Time HIGH or LOW Dn to CP CP Pulse Width HIGH or LOW MR Pulse Width LOW Recovery Time MR to CP b 55 DM54LS273 Nom 5 Max 55 Min 4 75 2 07 b0 4 DM74LS273 Nom 5 Max 5 25 Units V V 08 b0 4 45 2 V mA mA C ns ns ns ns ns 4 125 0 15 15 5 5 20 20 20 15 8 70 15 15 5 5 20 20 20 15 Electrical Characteristics Over recommended operating free air temperature range (unless otherwise noted) Symbol VI VOH Parameter Input Clamp Voltage High Level Output Voltage Low Level Output Voltage Conditions VCC e Min II e b18 mA VCC e Min IOH e Max VIL e Max VCC e Min IOL e Max VIH e Min IOL e 4 mA VCC e Min II IIH IIL IOS Input Current Input Voltage Max VCC e Max VI e 7V VI e 10V (DM54) VCC e Max VI e 2 7V VCC e Max VI e 0 4V VCC e Max (Note 2) VCC e Max DM54 DM74 b 20 b 20 Min Typ (Note 1) Max b1 5 Units V V DM54 DM74 DM54 DM74 DM74 25 27 34 04 0 35 0 25 05 04 01 20 b0 4 b 100 b 100 VOL V mA mA mA mA mA High Level Input Current Low Level Input Current Short Circuit Output Current Supply Current ICC 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 Switching Characteristics VCC e a 5 0V Symbol Parameter TA e a 25 C CL e 15 pF DM54LS Min Max Min 30 24 24 27 24 24 27 DM74LS RL e 2 kX Max MHz ns ns Units fmax tPLH tPHL tPLH Maximum Clock Frequency Propagation Delay CP to Qn Propagation Delay MR to Qn 30 Functional Description 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 Truth Table MR L H H Inputs CP X L L Dn X H L Outputs Qn 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 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 Fran ais 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