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HD74AC273

Hitachi Semiconductor
Part Number HD74AC273
Manufacturer Hitachi Semiconductor
Description Octal D Flip-Flop
Published Mar 23, 2005
Detailed Description HD74AC273 Octal D Flip-Flop Description The HD74AC273 has eight edge-triggered D-type flip-flops with individual D inpu...
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HD74AC273
HD74AC273

Overview
HD74AC273 Octal D Flip-Flop Description The HD74AC273 has eight edge-triggered D-type flip-flops with individual D inputs and Q outputs.
The common buffered Clock (CP) and Master Reset (MR ) inputs load and reset (clear) all flip-flops simultaneously.
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’s Q output All outputs will be forced Low independently of Clock or Data inputs by a Low voltage level on the MR input.
The device is useful for applications where the true output only is required and the Clock and Master Reset are common to all storage elements.
Features • • • • • • • Ideal Buffer for MOS Microprocessor or Memory Eight Edge-Triggered D Flip-Flops Buffered Common Clock Buffered, Asynchronous Master Reset See HD74AC373 for Transparent Latch Version See HD74AC374 for 3-State Version Outputs Source/Sink 24 mA HD74AC273 Pin Arrangement MR 1 Q0 2 D0 3 D1 4 Q1 5 Q2 6 D2 7 D3 8 Q3 9 Gnd 10 (Top view) 20 VCC 19 Q7 18 D7 17 D6 16 Q6 15 Q5 14 D5 13 D4 12 Q4 11 CP Logic Symbol D0 D1 D2 D3 D4 D5 D6 D7 CP MR Q0 Q1 Q2 Q3 Q4 Q5 Q6 Q7 Pin Names D0 – D7 MR CP Q0 – Q7 Data Inputs Master Reset Clock Pulse Input Data Outputs 2 HD74AC273 Logic Diagram D0 CP D1 D2 D3 D4 D5 D6 D7 D CP RD MR Q D CP RD Q D CP RD Q D CP RD Q D CP RD Q D CP RD Q D CP RD Q D CP RD Q Q0 Q1 Q2 Q3 Q4 Q5 Q6 Q7 Please note that this diagram is provided only for the understanding of logic operations and should not be used to estimate propagation delays.
Mode Select-Truth Table Inputs Operating Mode Reset (Clear) Load “1” Load “0” H : L : X : : MR L H H CP X Dn X H L Outputs Qn L H L High Voltage Level Low Voltage Level Immaterial Low-to-High Clock Transition DC Characteristics (unless otherwise specified) Item Maximum quiescent supply current Maximum quiescent supply current Symbol I CC I CC Max 80 8.
0 Unit µA µA Condition VIN = VCC or ground, VCC = ...


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