DM74LS156N datasheet(2/6 Pages) FAIRCHILD

Part #	DM74LS156N

Description	Dual 2-Line to 4-Line Decoders/Demultiplexers

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Manufacturer	FAIRCHILD [Fairchild Semiconductor]

Direct Link	http://www.fairchildsemi.com

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Function Tables

3-Line-to-8-Line Decoder or 1-Line-to-8-Line Demultiplexer

2-Line-to-4-Line Decoder or 1-Line-to-4-Line Demultiplexer

H

= HIGH level

L

= LOW level

X

= don’t care

Note 1: C

= inputs C1 and C2 connected together

Note 2: G

= inputs G1 and G2 connected together

Logic Diagram

Inputs

Outputs

Select

Strobe

(0)

(1)

(2)

(3)

(4)

(5)

(6)

(7)

Or Data

C (Note 1)

B

A

G (Note 2)

2Y0

2Y1

2Y2

2Y3

1Y0

1Y1

1Y2

1Y3

X

H

HHHHHHHH

L

HHHHHHH

L

H

L

H

L

HHHHHH

L

H

L

HH

L

HHHHH

L

H

L

HHH

L

HHHH

H

L

HHHH

L

HHH

H

L

H

L

HHHHH

L

H

L

HHHHHH

L

H

L

HHHHHHH

L

Inputs

Outputs

Select

Strobe

Data

1Y0

1Y1

1Y2

1Y3

BA

G1

C1

X

H

X

H

HHH

L

H

L

HHH

LH

L

H

L

H

HL

L

H

L

H

HH

L

H

L

X

L

H

HHH

Inputs

Outputs

Select

Strobe

Data

2Y02Y1

2Y22Y3

BA

G2

C2

X

H

X

HH

LL

L

H

LH

L

H

L

H

HL

L

H

L

H

HH

L

H

L

X

H

HH

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DM74LS156N Datasheet(PDF) 2 Page - Fairchild Semiconductor

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