M54HC670F1R 데이터 시트보기 (PDF) - STMicroelectronics
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M54HC670F1R Datasheet PDF : 12 Pages
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M54/M74HC670
WRITE FUNCTION TABLE
READ FUNCTION TABLE
WRITE INPUTS
WORDS
READ INPUTS
OUTPUTS
WB WA WE 0
1
2
3
RB RA RE Q0 Q1 Q2 Q3
L
L
L Q = D Q0 Q0 Q0
L
L
L W0B1 W0B2 W0B3 W0B4
L
H
L
Q0 Q = D Q0 Q0
L
H
L W1B1 W1B2 W1B3 W1B4
H
L
L
Q0 Q0 Q = D Q0
H
L
L W2B1 W2B2 W2B3 W2B4
H
H
L
Q0 Q0 Q0 Q = D
H
H
L W3B1 W3B2 W3B3 W3B4
X
X
H
Q0 Q0 Q0 Q0
X
X
H
Z
Z
Z
Z
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.
LOGIC DIAGRAM
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