HD74AC539 查看數據表（PDF） - Hitachi -> Renesas Electronics

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HD74AC539

Dual 1-of-4 Decoder with 3-State Output

Hitachi -> Renesas Electronics 

Pin Names

A0a to A1a

A0b to A1b

Ea – Eb

OEa, OEb

Pa, Pb

O0a to O3a

O0b to O3b

Side A Address Inputs

Side B Address Inputs

Enable Inputs (Active LOW)

Output Enable Inputs (Active LOW)

Polarity Control Inputs

Side A 3-State Outputs

Side B 3-State Outputs

Truth Table

Inputs

Function

OE

E

High impedance

H

X

Disable

L

H

Active HIGH output

L

L

(P = L)

L

L

L

L

L

L

Active LOW output

L

L

(P = H)

L

L

L

L

L

L

H : High Voltage Level

L : Low Voltage Level

X : Immaterial

Z : High Impedance

A1

A0

X

X

X

X

L

L

L

H

H

L

H

H

L

L

L

H

H

L

H

H

Outputs

O0

O1

Z

Z

On = P

H

L

L

H

L

L

L

L

L

H

H

L

H

H

H

H

HD74AC539

O2

O3

Z

Z

L

L

L

L

H

L

L

H

H

H

H

H

L

H

H

L

3

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