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| DM74LS74A Dual Positive-Edge-Triggered D Flip-Flops with Preset, Clear and Complementary Outputs August 1986 Revised March 2000 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. Ordering Code: Order Number DM74LS74AM DM74LS85ASJ DM74LS74AN Package Number M14A M14D N14A Package Description 14-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-120, 0.150 Narrow 14-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide 14-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 Function Table Inputs PR L H L H H H CLR H L L H H H CLK X X X L D X X X H L X Q H L H L Q0 Outputs Q L H L H Q0 H (Note 1) H (Note 1) H = HIGH Logic Level X = Either LOW or HIGH Logic Level L = LOW Logic Level = Positive-going Transition Q0 = The output logic level of Q before the indicated input conditions were established. Note 1: This configuration is nonstable; that is, it will not persist when either the preset and/or clear inputs return to their inactive (HIGH) level. (c) 2000 Fairchild Semiconductor Corporation DS006373 www.fairchildsemi.com DM74LS74A Absolute Maximum Ratings(Note 2) Supply Voltage Input Voltage Operating Free Air Temperature Range Storage Temperature Range 7V 7V 0C to +70C -65C to +150C Note 2: 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 fCLK fCLK tW Supply Voltage HIGH Level Input Voltage LOW Level Input Voltage HIGH Level Output Current LOW Level Output Current Clock Frequency (Note 3) Clock Frequency (Note 4) Pulse Width (Note 3) tW Pulse Width (Note 4) tSU tSU tH TA Setup Time (Note 3)(Note 5) Setup Time (Note 4)(Note 5) Hold Time (Note 5)(Note 6) Free Air Operating Temperature Clock HIGH Preset LOW Clear LOW Clock HIGH Preset LOW Clear LOW 0 0 18 15 15 25 20 20 20 25 0 0 70 ns ns ns C ns ns Parameter Min 4.75 2 0.8 -0.4 8 25 20 Nom 5 Max 5.25 Units V V V mA mA MHz MHz Note 3: CL = 15 pF, R L = 2 k, TA = 25C, and VCC = 5V. Note 4: CL = 50 pF, R L = 2 k, TA = 25C, and VCC = 5V. Note 5: The symbol () indicates the rising edge of the clock pulse is used for reference. Note 6: TA = 25C and V CC = 5V. www.fairchildsemi.com 2 DM74LS74A 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 Input Current @ Max Input Voltage Conditions VCC = Min, II = -18 mA VCC = Min, IOH = Max VIL = Max, VIH = Min VCC = Min, IOL = Max VIL = Max, VIH = Min IOL = 4 mA, VCC = Min VCC = Max VI = 7V Data Clock Preset Clear IIH HIGH Level Input Current VCC = Max VI = 2.7V Data Clock Clear Preset IIL LOW Level Input Current VCC = Max VI = 0.4V Data Clock Preset Clear IOS ICC Short Circuit Output Current Supply Current VCC = Max (Note 8) VCC = Max (Note 9) -20 4 2.7 3.4 0.35 0.25 0.5 0.4 0.1 0.1 0.2 0.2 20 20 40 40 -0.4 -0.4 -0.8 -0.8 -100 8 mA mA mA A mA Min Typ (Note 7) Max -1.5 Units V V V Note 7: All typicals are at VCC = 5V, TA = 25C. Note 8: 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 = 2.125V with the minimum and maximum limits reduced by one half from their stated values. This is very useful when using automatic test equipment. Note 9: With all outputs OPEN, ICC is measured with CLOCK grounded after setting the Q and Q outputs HIGH in turn. Switching Characteristics at VCC = 5V and TA = 25C From (Input) Symbol Parameter To (Output) CL = 15 pF Min fMAX tPLH tPHL tPLH tPHL tPLH tPHL Maximum Clock Frequency Propagation Delay Time LOW-to-HIGH Level Output Propagation Delay Time HIGH-to-LOW Level Output Propagation Delay Time LOW-to-HIGH Level Output Propagation Delay Time HIGH-to-LOW Level Output Propagation Delay Time LOW-to-HIGH Level Output Propagation Delay Time HIGH-to-LOW Level Output Clock to Q or Q 25 25 Max RL = 2 k CL = 50 pF Min 20 35 Max MHz ns Units Clock to Q or Q Preset to Q 30 25 35 35 ns ns Preset to Q 30 35 ns Clear to Q Clear to Q 25 30 35 35 ns ns 3 www.fairchildsemi.com DM74LS74A Physical Dimensions inches (millimeters) unless otherwise noted 14-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-120, 0.150 Narrow Package Number M14A www.fairchildsemi.com 4 DM74LS74A Physical Dimensions inches (millimeters) unless otherwise noted (Continued) 14-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide Package Number M14D 5 www.fairchildsemi.com DM74LS74A Dual Positive-Edge-Triggered D Flip-Flops with Preset, Clear and Complementary Outputs Physical Dimensions inches (millimeters) unless otherwise noted (Continued) 14-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide Package Number N14A 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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