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| HD74HC670 Datasheet, PDF (2/10 Pages) Hitachi Semiconductor – 4-by-4 Register File (with 3-state outputs) | |||
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HD74HC670
Function Table
Write Inputs
WB
WA
GW
L
L
L
L
H
L
H
L
L
H
H
L
X
X
H
Word
0
Q=D
Q0
Q0
Q0
Q0
1
Q0
Q=D
Q0
Q0
Q0
2
Q0
Q0
Q=D
Q0
Q0
3
Q0
Q0
Q0
Q=D
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.
2
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