HD74LV74 Просмотр технического описания (PDF) - Hitachi -> Renesas Electronics

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HD74LV74

Dual D–type Flip Flops with Preset and Clear

Hitachi -> Renesas Electronics 

HD74LV74A

Function Table

Inputs

Outputs

PRE

CLR

CLK

D

Q

Q

L

H

X

X

H

L

H

L

X

X

L

H

L

L

X

X

H*1

H*1

H

H

↑

H

H

L

H

H

↑

L

L

H

H

Note:

H

↓

X

Q0

Q0

H: High level

L: Low level

X: Immaterial

↑: Low to high transition

↓: High to low transition

Q0:The level of Q immediately before the input conditions shown in the above table are determined.

1.: Q and Q will remain HIGH as long as Preset and Clear are Low, but Q and Q are unpredictable,

if Preset and Clear go HIGH simultaneously.

Pin Arrangement

1CLR 1

1D 2

1CLK 3

1PRE 4

1Q 5

1Q 6

GND 7

(Top view)

14 VCC

13 2CLR

12 2D

11 2CLK

10 2PRE

9 2Q

8 2Q

2

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