MC74AC74DR2 ON Semiconductor

MC74AC74, MC74ACT74 Dual D-Type Positive Edge-Triggered Flip-Flop The MC74AC74/74ACT74 is a dual Dtype flipflop with Asynchronous Clear and Set inputs and complementary (Q,Q) outputs. Information at the input is transferred to the outputs on the www.onsemi.com positive edge of the clock pulse. Clock triggering occurs at a voltage level of the clock pulse and is not directly related to the transition time MARKING of the positive-going pulse. After the Clock Pulse input threshold DIAGRAMS voltage has been passed, the Data input is locked out and information present will not be transferred to the outputs until the next rising edge 14 of the Clock Pulse input. SOIC14 xxx74G Asynchronous Inputs: D SUFFIX AWLYWW LOW input to S (Set) sets Q to HIGH level D CASE 751A 14 1 LOW input to C (Clear) sets Q to LOW level D Clear and Set are independent of clock 1 Simultaneous LOW on C and S makes both Q and Q HIGH D D 14 Features xxx Outputs Source/Sink 24 mA TSSOP14 74 DT SUFFIX ALYW ACT74 Has TTL Compatible Inputs 1  CASE 948G These are PbFree Devices 14 1 V CC C D CP S Q Q D2 2 2 D2 2 2 14 13 12 11 10 9 8 xxx = AC or ACT A = Assembly Location WL or L = Wafer Lot C S Y = Year D1 D2 D Q CP Q 1 1 2 2 WW or W = Work Week CP Q D Q 1 S 1 2 C 2 D1 D2 G or  = PbFree Package (Note: Microdot may be in either location) 1 2 3 4 567 C D CP S Q Q GND D1 1 1 D1 1 1 ORDERING INFORMATION Figure 1. Pinout: 14Lead Packages Conductors See detailed ordering and shipping information in the package (Top View) dimensions section on page 7 of this data sheet. PIN ASSIGNMENT PIN FUNCTION D , D Data Inputs 1 2 CP , CP Clock Pulse Inputs 1 2 C , C Direct Clear Inputs D1 D2 S , S Direct Set Inputs D1 D2 Q , Q , Q , Outputs 1 1 2 Q 2 Semiconductor Components Industries, LLC, 2015 1 Publication Order Number: January, 2015 Rev. 8 MC74AC74/DMC74AC74, MC74ACT74 TRUTH TABLE (Each Half) Inputs Outputs Q Q 1 1 S C D1 D1 S C CP D Q Q D D D CP 1 1 L H X X H L H L X X L H L L X X H H H H H H L H H L L H Q Q H H L X Q Q 0 0 2 2 S CD D2 2 NOTE: H = HIGH Voltage Level D CP 2 2 L = LOW Voltage Level X = Immaterial; = LOW-to-HIGH Clock Transition Q (Q ) = Previous Q(Q) before LOW-to-HIGH 0 0 Transition of Clock Figure 2. Logic Symbol S D D Q CP Q C D NOTE: This diagram is provided only for the understanding of logic operations and should not be used to estimate propagation delays. Figure 3. Logic Diagram www.onsemi.com 2