DM74LS377 FAIRCHILD | Alldatasheet

Document overview

  • Manufacturer or author: Provided By ALLDATASHEET.COM(FREE DATASHEET DOWNLOAD SITE)
  • PDF pages: 5

Technical content

Features

■ 8-bit high speed parallel registers ■ Positive edge-triggered D-type flip-flops ■ Fully buffered common clock and enable inputs Ordering Code: Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code. Logic Symbol VCC = Pin 20 GND = Pin 10 Pin Descriptions Connection Diagram Truth Table H = HIGH Voltage Level L = LOW Voltage Level X = Immaterial Order Number Package Number Package Description DM74LS377WM M20B 20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300 Wide DM74LS377N N20A 20-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide Pin Names Description E Enable Input (Active LOW) D0–D7 Data Inputs CP Clock Pulse Input (Active Rising Edge) Q0–Q7 Flip-Flop Outputs Inputs Output E CP D n Q n H X X No Change L /c17 HH L /c17 LL

www.fairchildsemi.com 2 DM74LS377 Functional Description The DM74LS377 consists of eight edge-triggered D flip-flops with individual D inputs and Q outputs. The Clock (CP) and Enable input (E) are common to all flip-flops. When E is LOW, new data is entered into the register on the next LOW-to-HIGH transition of CP. When E is HIGH, the reg- ister will retain the present data independent of the CP. Logic Diagram

3 www.fairchildsemi.com DM74LS377 Absolute Maximum Ratings(Note 1) 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

Electrical Characteristics

over recommended operating free air temperature range (unless otherwise noted) 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 Supply Voltage 7V Input Voltage 7V Operating Free Air Temperature Range 0°C to +70°C Storage Temperature Range −65°C to +150°C Symbol Parameter Min Nom Max Units V CC Supply Voltage 4.75 5 5.25 V VIH HIGH Level Input Voltage 2 V VIL LOW Level Input Voltage 0.8 V IOH HIGH Level Output Current −0.4 mA IOL LOW Level Output Current 8 mA TA Free Air Operating Temperature 0 70 °C tS (H) Setup Time HIGH or LOW 10 nstS (L) D n to CP 10 tH (H) Hold Time HIGH or LOW 5.0 nstH (L) D n to CP 5.0 tS (H) Setup Time HIGH or LOW 10 nstS (L) E to CP 20 tH (H) Hold Time HIGH or LOW 5.0 nstH (L) E to CP 5.0 tW (H) CP Pulse Width HIGH or LOW 20 nstW (L) 20 Symbol Parameter Conditions Min Typ Max Units (Note 2) VI Input Clamp Voltage V CC = Min, II = −18 mA −1.5 V VOH HIGH Level V CC = Min, IOH = Max 2.7 3.4 V Output Voltage V IL = Max VOL LOW Level V CC = Min, IOL = Max 0.35 0.5 Output Voltage V IH = Min V IOL = 4 mA, VCC = Min 0.25 0.4 II Input Current @ Max V CC = Max, VI = 7V 0.1 mA Input Voltage V I = 10V IIH HIGH Level Input Current V CC = Max, VI = 2.7V 20.0 µA IIL LOW Level Input Current V CC = Max, VI = 0.4V −0.4 mA IOS Short Circuit Output Current V CC = Max (Note 3) −20 −100 mA ICC Supply Current V CC = Max 28 mA Symbol Parameter R L = 2 kΩ , CL = 15 pF Units Min Max fMAX Maximum Clock Frequency 30 MHz tPLH Propagation Delay 25 ns tPHL CP to Qn 25

www.fairchildsemi.com 4 DM74LS377 Physical Dimensions inches (millimeters) unless otherwise noted 20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300 Wide Package Number M20B

5 www.fairchildsemi.com DM74LS377 Octal D-Type Flip-Flop with Common Enable and Clock 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 rea- sonably expected to result in a significant injury to the user. 2. A critical component in any component of a life support device or system whose failure to perform can be rea- sonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. www.fairchildsemi.com