74HC670DB datasheet(3/9 Pages) PHILIPS

部品番号	74HC670DB

部品情報	4 x 4 register file 3-state

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メーカー	PHILIPS [NXP Semiconductors]

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3 / 9 page

December 1990

3

Philips Semiconductors

Product speciﬁcation

4 x 4 register ﬁle; 3-state

74HC/HCT670

PIN DESCRIPTION

PIN NO.

SYMBOL

NAME AND FUNCTION

5, 4

RA, RB

read address inputs

8

GND

ground (0 V)

10, 9, 7, 6

Q0 to Q3

data outputs

11

RE

3-state output read enable input (active LOW)

12

WE

write enable input (active LOW)

14, 13

WA, WB

write address inputs

15, 1, 2, 3

D0 to D3

data inputs

16

VCC

positive supply voltage

Fig.1 Pin configuration.

Fig.2 Logic symbol.

Fig.3 IEC logic symbol.

Fig.4 Functional diagram.

WRITE MODE SELECT TABLE

Note

1. The write address (WA and WB) to the

“internal latches” must be stable while WE is

LOW for conventional operation.

OPERATING

MODE

INPUTS

INTERNAL

LATCHES(1)

WE

Dn

write data

L

H

L

H

data latched

H

X

no change

READ MODE SELECT TABLE

Notes

1. The selection of the “internal latches” by read address

(RA and RB) are not constrained by WE or RE operation.

H = HIGH voltage level

L = LOW voltage level

X = don’t care

Z = high impedance OFF-state

OPERATING

MODE

INPUTS

OUTPUT

RE

INTERNAL LATCHES(1)

Qn

read

L

H

L

H

disabled

H

X

Z

同様の部品番号 - 74HC670DB

メーカー	部品番号	データシート	部品情報
NXP Semiconductors	74HC670D	80Kb / 9P	4 x 4 register file; 3-state December 1990

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同様の説明 - 74HC670DB

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