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74LCX646TTR 数据表(PDF) 3 Page - STMicroelectronics |
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74LCX646TTR 数据表(HTML) 3 Page - STMicroelectronics |
3 / 16 page M74LCX646 3/16 Table 3: Truth Table X : Don’t Care Z : High Impedance Qn: The data stored to the internal flip-flops by most recent low to high transition of the clock inputs * : The data at the A and B bus will be stored to the internal flip-flops on every low to high transition of the clock inputs. G DIR CAB CBA SAB SBA A B FUNCTION HX INPUTS INPUTS Both the A bus and the B bus are inputs X X X X Z Z The Output functions of the A and B bus are disabled X X INPUTS INPUTS Both the A and B bus are used as inputs to the internal flip-flops. Data at the bus will be stored on low to high transition of the clock inputs. LH INPUTS OUTPUTS The A bus are inputs and the B bus are outputs XX* L X LL The data at the A bus are displayed at the B bus HH X* L X L L The data at the A bus are displayed at the B bus. The data of the A bus are stored to internal flip-flop on low to high transition of the clock pulse HH XX*H X X Qn The data stored to the internal flip-flop are displayed at the B bus. X* H X L L The data at the A bus are stored to the internal flip-flop on low to high transition of the clock pulse. The states of the internal flip-flops output directly to the B bus. HH LL OUTPUTS INPUTS The B bus are inputs and the A bus are outputs. X* X X L LL The data at the B bus are displayed at the A bus HH X* X L L L The data at the B bus are displayed at the A bus. The data of the B bus are stored to the internal flip-flop on low to high transition of the clock pulse. HH X* X X H Qn X The data stored to the internal flip-flops are displayed at the A bus X* X H L L The data at the B bus are stored to the internal flip-flop on low to high transition of the clock pulse. The states of the internal flip-flops output directly to the A bus. HH |
类似零件编号 - 74LCX646TTR |
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类似说明 - 74LCX646TTR |
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