MC74AC377, MC74ACT377 Octal D Flip-Flop with Clock Enable The MC74AC377/74ACT377 has eight edge-triggered, D-type flip-flops with individual D inputs and Q outputs. The common buffered Clock (CP) input loads all flip-flops simultaneously, when www.onsemi.com the Clock Enable (CE) is LOW. The register is fully edge-triggered. The state of each D input, one setup time before the LOW-to-HIGH clock transition, is transferred to the corresponding flip-flops Q output. The CE input must be stable only one setup time prior to the SOIC20W DW SUFFIX LOW-to-HIGH clock transition for predictable operation. CASE 751D 1 Features Ideal for Addressable Register Applications Clock Enable for Address and Data Synchronization Applications TSSOP20 Eight Edge-Triggered D Flip-Flops DT SUFFIX Buffered Common Clock CASE 948E Outputs Source/Sink 24 mA 1 See MC74AC273 for Master Reset Version See MC74AC373 for Transparent Latch Version ORDERING INFORMATION See MC74AC374 for 3-State Version See detailed ordering and shipping information in the package dimensions section on page 7 of this data sheet. ACT377 Has TTL Compatible Inputs MSL = 1 for all Surface Mount DEVICE MARKING INFORMATION Chip Complexity: 292 FETs or 73 Gates See general marking information in the device marking section on page 7 of this data sheet. These are PbFree Devices 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 1 2 345 67 8 9 10 CE O D D O O D D O GND 0 0 1 1 2 2 3 3 Figure 1. Pinout: 20Lead Packages Conductors (Top View) PIN NAMES D D D D D D D D 0 1 2 3 4 5 6 7 PIN FUNCTION CP D D Data Inputs 0 7 CE O O O O O O O O CE Clock Enable (Active LOW) 0 1 2 3 4 5 6 7 Q Q Data Outputs 0 7 CP Clock Pulse Input Figure 2. Logic Symbol Semiconductor Components Industries, LLC, 2015 1 Publication Order Number: March, 2015 Rev. 10 MC74AC377/DMC74AC377, MC74ACT377 MODE SELECT-FUNCTION TABLE Inputs Outputs Operating Mode CP CE D Q n n Load 1 L H H Load 0 L L L H X No Change Hold (Do Nothing) X H X No Change H = HIGH Voltage Level L = LOW Voltage Level X = Immaterial = LOW-to-HIGH Clock Transition D D D D D D D D 0 1 2 3 4 5 6 7 CE DQ DQ DQ DQ DQ DQ DQ DQ CP CP CP CP CP CP CP CP CP O O O O O O O O 0 1 2 3 4 5 6 7 Please 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