54LS379/DM74LS379 Quad Parallel Register with Enable General Description Features The LS379 is a 4-bit register with buffered common Enable. This device is similar to the LS175 but features the common Enable rather than common Master Reset. Y Y Y Y Connection Diagram Edge-triggered D-type inputs Buffered positive edge-triggered clock Buffered common enable input True and complement outputs Logic Symbol Dual-In-Line Package TL/F/10186 – 2 VCC e Pin 16 GND e Pin 8 TL/F/10186 – 1 Order Number 54LS379DMQB, 54LS379FMQB, 54LS379LMQB, DM74LS379M or DM74LS379N See NS Package Number E20A, J16A, M16A, N16E or W16A C1995 National Semiconductor Corporation Pin Names Description E D0–D3 CP Q0–Q3 Q0 – Q3 Enable Input (Active LOW) Data Inputs Clock Pulse Input (Active Rising Edge) Flip-Flop Outputs Complement Outputs TL/F/10186 RRD-B30M105/Printed in U. S. A. 54LS379/DM74LS379 Quad Parallel Register with Enable June 1989 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 54LS DM74LS 0§ C to a 70§ C Storage Temperature Range b 65§ C to a 150§ C Recommended Operating Conditions Symbol 54LS379 Parameter DM74LS379 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 20 20 th(H) th(L) Hold Time HIGH or LOW Dn to CP 5 5 ts(H) ts(L) Setup Time HIGH or LOW E to CP 25 25 th(H) th(L) Hold Time HIGH or LOW E to CP 5 5 tw(L) CP Pulse Width LOW 17 17 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 ns ns ns ns ns 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 54LS 2.5 DM74 2.7 Low Level Output Voltage VCC Min, IOL e Max, VIH e Min 54LS 0.4 DM74 0.5 IOL e 4 mA, VCC e Min DM74 0.4 VOL V V II Input Current @ Max Input Voltage VCC e Max, VI e 10V 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 54LS b 20 b 100 DM74 b 20 b 100 18 Note 1: All typicals are at VCC e 5V, TA e 25§ C. Note 2: Note 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 (See Section 1 for test waveforms and output load) Symbol RL e 2 kX, CL e 15 pF Parameter Min fmax Maximum Clock Frequency tPLH tPHL Propagation Delay CP to Qn Units Max 30 MHz 27 27 Functional Description ns Truth Table The LS379 consists of four edge-triggered D-type flip-flops with individual D inputs and Q and Q outputs. The Clock (CP) and Enable (E) inputs are common to all flip-flops. When the E input is HIGH, the register will retain the present data independent of the CP input. The Dn and E inputs can change when the clock is in either state, provided that the recommended setup and hold times are observed. Inputs E CP Outputs Dn H L X L L L L H L Qn Qn No Change H L No Change L H H e HIGH Voltage Level L e LOW Voltage Level X e Immaterial Logic Diagram TL/F/10186 – 3 3 Physical Dimensions inches (millimeters) Ceramic Leadless Chip Carrier Package (E) Order Number 54LS379LMQB NS Package Number E20A 16-Lead Ceramic Dual-In-Line Package (J) Order Number 54LS379DMQB NS Package Number J16A 4 Physical Dimensions inches (millimeters) 16-Lead Small Outline Molded Package (M) Order Number DM74LS379M NS Package Number M16A 16-Lead Molded Dual-In-Line Package (N) Order Number DM74LS379N NS Package Number N16E 5 54LS379/DM74LS379 Quad Parallel Register with Enable Physical Dimensions inches (millimeters) 16-Lead Ceramic Flat Package (W) Order Number 54LS379FMQB NS Package Number W16A 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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