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TC74LCX652FS Scheda tecnica(PDF) 3 Page - Toshiba Semiconductor |
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TC74LCX652FS Scheda tecnica(HTML) 3 Page - Toshiba Semiconductor |
3 / 11 page TC74LCX652FS 2007-10-19 3 Truth Table Control Inputs Bus OEAB OEBA CAB CBA SAB SBA A B Function Input Input X* X* X X Z Z The output functions of A and B busses are disabled. L H X X X X Both A and B busses are used as inputs to the internal flip-flops. Data on the bus will be stored on the rising edge of the Clock. Input Output L L X* X* L X H H The data on the A bus are displayed on the B bus. L L X* L X H H The data on the A bus are displayed on the B bus, and are stored into the A storage flip-flops on the rising edge of CAB. X* X* H X X Qn The data in the A storage flop-flops are displayed on the B bus. L L H H X* H X H H The data on the A bus are stored into the A storage flip-flops on the rising edge of CAB, and the stored data propagate directly onto the B bus. Output Input L L X* X* X L H H The data on the B bus are displayed on the A bus. L L X* X L H H The data on the B bus are displayed on the A bus, and are stored into the B storage flip-flops on the rising edge of CBA. X* X* X H Qn X The data in the B storage flip-flops are displayed on the A bus. L L L L X* X H H H The data on the B bus are stored into the B storage flip-flops on the rising edge of CBA, and the stored data propagate directly onto the A bus. Output Output H L X* X* H H Qn Qn The data in the A storage flop-flops are displayed on the B bus, and the data in the B storage flop-flops are displayed on the A. X: Don’t care Z: High impedance Qn: The data stored into the internal flip-flops by most recent low to high transition of the clock inputs. *: The clocks are not internally gated with either OEAB or OEBA . Therefore, data on the A and/or B busses may be clocked into the storage flip-flops at any time. |
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