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M54HC670 数据表(PDF) 2 Page - STMicroelectronics |
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M54HC670 数据表(HTML) 2 Page - STMicroelectronics |
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2 / 12 page  LOGIC DIAGRAM WRITE FUNCTION TABLE WRITE INPUTS WORDS WB WA WE 0 1 2 3 L L L Q = D Q0Q0Q0 LHL Q0 Q = D Q0 Q0 HL L Q0 Q0 Q = D Q0 H H L Q0Q0Q0 Q = D X X H Q0 Q0 Q0 Q0 READ FUNCTION TABLE READ INPUTS OUTPUTS RB RA RE Q0 Q1 Q2 Q3 L L L W0B1 W0B2 W0B3 W0B4 L H L W1B1 W1B2 W1B3 W1B4 H L L W2B1 W2B2 W2B3 W2B4 H H L W3B1 W3B2 W3B3 W3B4 X X H Z ZZZ Notes: 1 *: DON’T CARE Z: HIGH IMPEDANCE 2 (Q = D) = THE FOUR SELECT INTERNAL FLIP FLOP OUTPUTS WILL ASSUME THE STATES APPLIED TO THE FOUR EXTERNAL DATA INPUTS. 3 Q0 = THE LEVEL OF Q BEFORE THE INDICATED INPUT CONDITIONS WERE ESTABLISHED. 4 W0B1 = THE FIRST BIT OF WORD 0, ETC. M54/M74HC670 2/12 |
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