DatasheetsPDF.com

DM54LS74A Dataheets PDF



Part Number DM54LS74A
Manufacturers National Semiconductor
Logo National Semiconductor
Description Dual Positive-Edge-Triggered D Flip-Flops with Preset/ Clear and Complementary Outputs
Datasheet DM54LS74A DatasheetDM54LS74A Datasheet (PDF)

54LS74 DM54LS74A DM74LS74A Dual Positive-Edge-Triggered D Flip-Flops with Preset Clear and Complementary Outputs June 1989 54LS74 DM54LS74A DM74LS74A Dual Positive-Edge-Triggered D Flip-Flops with Preset Clear and Complementary Outputs General Description This device contains two independent positive-edge-triggered D flip-flops with complementary outputs The information on the D input is accepted by the flip-flops on the positive going edge of the clock pulse The triggering occurs at a voltage.

  DM54LS74A   DM54LS74A


Document
54LS74 DM54LS74A DM74LS74A Dual Positive-Edge-Triggered D Flip-Flops with Preset Clear and Complementary Outputs June 1989 54LS74 DM54LS74A DM74LS74A Dual Positive-Edge-Triggered D Flip-Flops with Preset Clear and Complementary Outputs General Description This device contains two independent positive-edge-triggered D flip-flops with complementary outputs The information on the D input is accepted by the flip-flops on the positive going edge of the clock pulse The triggering occurs at a voltage level and is not directly related to the transition time of the rising edge of the clock The data on the D input may be changed while the clock is low or high without affecting the outputs as long as the data setup and hold times are not violated A low logic level on the preset or clear inputs will set or reset the outputs regardless of the logic levels of the other inputs Features Y Alternate military aerospace device (54LS74) is available Contact a National Semiconductor Sales Office Distributor for specifications Connection Diagram Dual-In-Line Package TL F 6373 – 1 Order Number 54LS74DMQB 54LS74FMQB 54LS74LMQB DM54LS74AJ DM54LS74AW DM74LS74AM or DM74LS74AN See NS Package Number E20A J14A M14A N14A or W14B Function Table Inputs PR L H L H H H CLR H L L H H H CLK X X X D X X X H L X Outputs Q H L H H L Q0 Q L H H L H Q0 u u L H e High Logic Level X e Either Low or High Logic Level L e Low Logic Level u e Positive-going Transition e This configuration is nonstable that is it will not persist when either the preset and or clear inputs return to their inactive (high) level Q0 e The output logic level of Q before the indicated input conditions were established C1995 National Semiconductor Corporation TL F 6373 RRD-B30M105 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 and 54LS DM74LS 0 C to a 70 C Storage Temperature Range b 65 C to a 150 C 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 fCLK fCLK tW Parameter Min Supply Voltage High Level Input Voltage Low Level Input Voltage High Level Output Current Low Level Output Current Clock Frequency (Note 2) Clock Frequency (Note 3) Pulse Width (Note 2) Clock High Preset Low Clear Low tW Pulse Width (Note 3) Clock High Preset Low Clear Low tSU tSU tH TA Setup Time (Notes 1 and 2) Setup Time (Notes 1 and 3) Hold Time (Note 1 and 4) Free Air Operating Temperature 0 0 18 15 15 25 20 20 20u 25u 0u b 55 DM54LS74A Nom 5 Max 55 Min 4 75 2 07 b0 4 DM74LS74A Nom 5 Max 5 25 Units V V 08 b0 4 45 2 V mA mA MHz MHz 4 25 20 0 0 18 15 15 25 20 20 20u 25u 0u 125 0 8 25 20 ns ns ns ns ns 70 C Note 1 The symbol ( u) indicates the rising edge of the clock pulse is used for reference Note 2 CL e 15 pF RL e 2 kX TA e 25 C and VCC e 5V Note 3 CL e 50 pF RL e 2 kX TA e 25 C and VCC e 5V Note 4 TA e 25 C and VCC e 5V 2 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 VIH e Min VCC e Min IOL e Max VIL e Max VIH e Min IOL e 4 mA VCC e Min II Input Current Max Input Voltage VCC e Max VI e 7V DM54 DM74 DM54 DM74 DM74 Data Clock Preset Clear IIH High Level Input Current VCC e Max VI e 2 7V Data Clock Clear Preset IIL Low Level Input Current VCC e Max VI e 0 4V Data Clock Preset Clear IOS Short Circuit Output Current Supply Current VCC e Max (Note 2) VCC e Max (Note 3) DM54 DM74 b 20 b 20 Min Typ (Note 1) Max b1 5 Units V V 25 27 34 34 0 25 0 35 0 25 04 05 04 01 01 02 02 20 20 40 40 b0 4 b0 4 b0 8 b0 8 b 100 b 100 VOL V mA mA mA mA mA ICC 4 8 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 For devices with feedback from the outputs where shorting the outputs to ground may cause the outputs to change logic state an equivalent test may be performed where VO e 2 25V and 2 125V for DM54 and DM74 series respectively with the minimum and maximum limits reduced by one half from their stated values This is very useful when using automatic test equipment Note 3 With all outputs open ICC is measured with CLOCK grounded after setting the Q and Q outputs high in turn Switching Characteristics at VCC e 5V and T.


DM54LS502 DM54LS74A DM54S64


@ 2014 :: Datasheetspdf.com :: Semiconductors datasheet search & download site.
(Privacy Policy & Contact)