HD74HC670 데이터 시트보기 (PDF) - Hitachi -> Renesas Electronics

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HD74HC670

4-by-4 Register File (with 3-state outputs)

Hitachi -> Renesas Electronics 

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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