Revised March 2000 DM74LS273 8-Bit Register with Clear General Description Features 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. ■ Edge-triggered ■ 8-bit high speed register ■ Parallel in and out ■ Common clock and master reset Ordering Code: Order Number Package Number Package Description DM74LS273WM M20B 20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300 Wide DM74LS273SJ M20D 20-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide DM74LS273N N20A 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. Connection Diagram Logic Symbol VCC = Pin 20 GND = Pin 10 Truth Table Pin Descriptions Pin Names Inputs Description Outputs Qn MR CP Dn Data Inputs L L MR Asynchronous Master Reset Input (Active LOW) H H H Q0–Q7 Flip-Flop Outputs X L L CP Clock Pulse Input (Active Rising Edge) D0–D7 H H = HIGH Voltage Level L = LOW Voltage Level X = Immaterial © 2000 Fairchild Semiconductor Corporation DS009825 X www.fairchildsemi.com DM74LS273 8-Bit Register with Clear October 1988 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 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 4.75 5 5.25 Units VCC Supply Voltage VIH HIGH Level Input Voltage V VIL LOW Level Input Voltage 0.8 V IOH HIGH Level Output Current −0.4 mA 8 mA 70 °C 2 IOL LOW Level Output Current TA Free Air Operating Temperature 0 tS(H) Setup Time HIGH or LOW 15 tS(L) Dn to CP 15 tH(H) Hold Time HIGH or LOW 5 tH(L) Dn to CP 5 tW(H) CP Pulse Width HIGH or LOW V ns ns 20 tW(L) ns 20 tW(L) MR Pulse Width LOW tREC Recovery Time MR to CP 20 ns 15 ns Electrical Characteristics Over recommended operating free air temperature range (unless otherwise noted) Symbol Parameter Conditions VI Input Clamp Voltage VCC = Min, II = −18 mA VOH HIGH Level VCC = Min, IOH = Max, Output Voltage VIL = Max LOW Level VCC = Min, IOL = Max, Output Voltage VIH = Min VOL Min Typ (Note 2) 2.7 IOL = 4 mA, VCC = Min Max Units −1.5 V 3.4 V 0.35 0.5 0.25 0.4 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) ICC Supply Current VCC = Max −20 mA −100 mA 27 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 CL = 15 pF Symbol RL = 2 kΩ Parameter Min Units Max fMAX Maximum Clock Frequency tPLH Propagation Delay 30 24 MHz tPHL CP to Qn 24 tPLH Propagation Delay 27 MR to Qn 3 ns ns www.fairchildsemi.com DM74LS273 Absolute Maximum Ratings(Note 1) 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: 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 www.fairchildsemi.com 6