TC74HC670AF データシートの表示（PDF） - Toshiba

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TC74HC670AF

4 Word × 4 Bit Register File (3-state)

Toshiba 

IEC Logic Symbol

TC74HC670AP/AF

Truth Table

Write Function Table

Write Inputs

WB WA WE

L

L

L

L

H

L

H

L

L

H

H

L

X

X

H

Words

0

1

2

3

Q = D Q0 Q0 Q0

Q0 Q = D Q0 Q0

Q0 Q0 Q = D Q0

Q0 Q0 Q0 Q = D

Q0 Q0 Q0 Q0

Read Function Table

Read Inputs

RB RA RE

L

L

L

L

H

L

H

L

L

H

H

L

X

X

H

Outputs

Q1 Q2 Q3 Q4

W0B1 W0B2 W0B3 W0B4

W1B1 W1B2 W1B3 W1B4

W2B1 W2B2 W2B3 W2B4

W3B1 W3B2 W3B3 W3B4

Z

Z

Z

Z

X: Don’t care

Z: High impedance

(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.

W0B1: The first bit of word 0, etc.

Block Diagram

2

2007-10-01

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