DM74LS670CW データシートの表示（PDF） - Fairchild Semiconductor
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DM74LS670CW Datasheet PDF : 6 Pages
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Connection Diagram
Function Tables
Write Table (Note 1)(Note 2)
Read Table (Note 3)
Write Inputs
Word
Read Inputs
Outputs
WB WA GW
0
1
2
3
RB RA GR
Q1
Q2
Q3
L
L
L Q=D
Q0
Q0
Q0
LHL
Q0
Q=D
Q0
Q0
HLL
Q0
Q0
Q=D
Q0
HHL
Q0
Q0
Q0
Q=D
XXH
Q0
Q0
Q0
Q0
L
L
L WOB1 WOB2 WOB3
L H L W1B1 W1B2 W1B3
H
L
L W2B1 W2B2 W2B3
H H L W3B1 W3B2 W3B3
XXH
Z
Z
Z
H = HIGH Level
L = LOW Level
X = Don’t Care
Z = High Impedance (OFF)
Note 1: (Q = D) = The four selected internal flip-flop outputs will assume the states applied to the four external data inputs.
Note 2: Q0 = The level of Q before the indicated input conditions were established.
Note 3: WOB1 = The first bit of word 0, etc.
Logic Diagram
Q4
WOB4
W1B4
W2B4
W3B4
Z
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