MC74AC374, MC74ACT374 Octal D-Type Flip-Flop with 3-State Outputs The MC74AC374/74ACT374 is a highspeed, lowpower octal Dtype flipflop featuring separate Dtype inputs for each flipflop and 3state outputs for busoriented applications. A buffered Clock www.onsemi.com (CP) and Output Enable (OE) are common to all flipflops. Features Buffered Positive EdgeTriggered Clock SOIC20W 3State Outputs for BusOriented Applications DW SUFFIX CASE 751D Outputs Source/Sink 24 mA 1 See MC74AC273 for Reset Version See MC74AC377 for Clock Enable Version See MC74AC373 for Transparent Latch Version TSSOP20 See MC74AC574 for Broadside Pinout Version DT SUFFIX See MC74AC564 for Broadside Pinout Version with Inverted CASE 948E Outputs 1 ACT374 Has TTL Compatible Inputs These are PbFree Devices DEVICE MARKING INFORMATION See general marking information in the device marking section on page 6 of this data sheet. V O D D O O D D O CP CC 7 7 6 6 5 5 4 4 20 19 18 17 16 15 14 13 12 11 ORDERING INFORMATION See detailed ordering and shipping information in the package dimensions section on page 8 of this data sheet. 1 2 34567 8 9 10 OE O D D O O D D O GND 0 0 1 1 2 2 3 3 Figure 1. Pinout: 20 Lead Packages Conductors (Top View) PIN ASSIGNMENT PIN FUNCTION D D Data Inputs 0 7 D D D D D D D D 0 1 2 3 4 5 6 7 CP Clock Pulse Input CP OE 3State Output Enable Input OE O O O O O O O O 0 1 2 3 4 5 6 7 O O 3State Outputs 0 7 Figure 2. Logic Symbol Semiconductor Components Industries, LLC, 2015 1 Publication Order Number: March, 2015 Rev. 9 MC74AC374/DMC74AC374, MC74ACT374 FUNCTIONAL DESCRIPTION TRUTH TABLE The MC74AC374/74ACT374 consists of eight edge Inputs Outputs triggered flipflops with individual Dtype inputs and D CP OE O n n 3state true outputs. The buffered clock and buffered Output H L H Enable are common to all flipflops. The eight flipflops L L L will store the state of their individual D inputs that meet the X X H Z setup and hold time requirements on the LOWtoHIGH H = HIGH Voltage Level Clock (CP) transition. With the Output Enable (OE) LOW, L = LOW Voltage Level the contents of the eight flipflops are available at the X = Immaterial outputs. When the OE is HIGH, the outputs go to the high Z = High Impedance = LOW-to-HIGH Transition impedance state. Operation of the OE input does not affect the state of the flipflops. D D D D D D D D 0 1 2 3 4 5 6 7 CP CP D CP D CP D CP D CP D CP D CP D CP D QQ QQ QQ QQ QQ QQ QQ QQ OE O O O O O O O O 0 1 2 3 4 5 6 7 NOTE: That 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