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| DM74LS273 8-Bit Register with Clear October 1988 Revised March 2000 DM74LS273 8-Bit Register with Clear General Description The DM74LS273 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 20-pin package featuring 0.3 inch row spacing. Features s Edge-triggered s 8-bit high speed register s Parallel in and out s Common clock and master reset Ordering Code: Order Number DM74LS273WM DM74LS273SJ DM74LS273N Package Number M20B M20D N20A Package Description 20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300 Wide 20-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide 20-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide Devices also available in Tape and Reel. Specify by appending the suffix letter "X" to the ordering code. Logic Symbol Connection Diagram VCC = Pin 20 GND = Pin 10 Pin Descriptions Pin Names CP D0-D7 MR Q0-Q7 Data Inputs Asynchronous Master Reset Input (Active LOW) Flip-Flop Outputs Description Clock Pulse Input (Active Rising Edge) Truth Table Inputs MR L H H H = HIGH Voltage Level L = LOW Voltage Level X = Immaterial Outputs Dn X H L Qn L H L CP X (c) 2000 Fairchild Semiconductor Corporation DS009825 www.fairchildsemi.com DM74LS273 Functional Description The DM74LS273 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-to-HIGH transition of the clock input. Logic Diagram www.fairchildsemi.com 2 DM74LS273 Absolute Maximum Ratings(Note 1) Supply Voltage Input Voltage Operating Free Air Temperature Range Storage Temperature Range 7V 7V 0C to +70C -65C to +150C 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. 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 MR Pulse Width LOW Recovery Time MR to CP 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 0 15 15 5 5 20 20 20 15 Parameter Min 4.75 2 0.8 -0.4 8 70 Nom 5 Max 5.25 Units V V V mA mA C ns ns ns ns ns Electrical Characteristics Over recommended operating free air temperature range (unless otherwise noted) Symbol VI VOH VOL Parameter Input Clamp Voltage HIGH Level Output Voltage LOW Level Output Voltage II IIH IIL IOS ICC Input Current @ Max Input Voltage HIGH Level Input Current LOW Level Input Current Short Circuit Output Current Supply Current Conditions VCC = Min, II = -18 mA VCC = Min, IOH = Max, VIL = Max VCC = Min, IOL = Max, VIH = Min IOL = 4 mA, VCC = Min VCC = Max, VI = 7V VCC = Max, VI = 2.7V VCC = Max, VI = 0.4V VCC = Max (Note 3) VCC = Max -20 2.7 3.4 0.35 0.25 0.5 0.4 0.1 20 -0.4 -100 27 mA A mA mA mA Min Typ (Note 2) Max -1.5 Units V V V Note 2: All typicals are at VCC = 5V, TA = 25C. 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 =+25C CL = 15 pF Symbol Parameter Min fMAX tPLH tPHL tPLH Maximum Clock Frequency Propagation Delay CP to Qn Propagation Delay MR to Qn 30 24 24 27 RL = 2 k Max MHz ns ns Units 3 www.fairchildsemi.com DM74LS273 Physical Dimensions inches (millimeters) unless otherwise noted 20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300 Wide Package Number M20B www.fairchildsemi.com 4 DM74LS273 Physical Dimensions inches (millimeters) unless otherwise noted (Continued) 20-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide Package Number M20D 5 www.fairchildsemi.com DM74LS273 8-Bit Register with Clear Physical Dimensions inches (millimeters) unless otherwise noted (Continued) 20-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide Package Number N20A 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: 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 6 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. www.fairchildsemi.com |
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