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HD74HC670P Datasheet(PDF) 2 Page - Renesas Technology Corp |
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HD74HC670P Datasheet(HTML) 2 Page - Renesas Technology Corp |
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2 / 9 page  HD74HC670 Rev.2.00 Mar 30, 2006 page 2 of 8 Function Table Write Inputs Word WB WA GW 0 1 2 3 L L L Q = D Q0 Q0 Q0 L H L Q0 Q = D Q0 Q0 H L L Q0 Q0 Q = D Q0 H H L Q0 Q0 Q0 Q = D X X H Q0 Q0 Q0 Q0 Read Inputs Outputs RB RA GR Q1 Q2 Q3 Q4 L L L W0 B1 W0 B2 W0 B3 W0 B4 L H L W1 B1 W1 B2 W1 B3 W1 B4 H L L W2 B1 W2 B2 W2 B3 W2 B4 H H L W3 B1 W3 B2 W3 B3 W3 B4 X X H Z Z Z Z H : high level L : low level X : irrelevant Z : high impedance (off) (Q = D): The four selected internal flip-flop outputs will assume the states applied to the four external data inputs. Q0 : The level of Q before the indicated input conditions were established. W0 B1 : The first bit of word 0, etc. Pin Arrangement 1 2 3 4 5 6 7 8 D2 D3 D4 RB RA Q4 Q3 GND VCC WA WB Write Read Q1 Q2 Data D1 Write select Outputs Outputs Read select Data Enable D1 WA WB CW CR Q1 D3 D4 RB RA Q4 Q3 D2 Q2 (Top view) 16 15 14 13 12 11 10 9 |
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