SN54ALS253, SN74ALS253, SN74AS253A

DUAL 1OF4 DATA SELECTORS/MULTIPLEXERS

WITH 3STATE OUTPUTS

SDAS216A − APRIL 1982 − REVISED DECEMBER 1994

Copyright

 1994, Texas Instruments Incorporated

1

POST OFFICE BOX 655303

• DALLAS, TEXAS 75265

POST OFFICE BOX 1443

• HOUSTON, TEXAS 77251−1443

• 3-State Versions of the ′ALS153 and

SN74AS153

• Permits Multiplexing From n Lines to

One Line

• Performs Parallel-to-Serial Conversion

• Package Options Include Plastic

Small-Outline (D) Packages, Ceramic Chip

Carriers (FK), and Standard Plastic (N) and

Ceramic (J) 300-mil DIPs

description

These

data

selectors/multiplexers

contain

inverters and drivers to supply full binary decoding

data selection to the AND-OR gates. Separate

output control inputs are provided for each of the

two 4-line sections.

The 3-state outputs can interface with and drive

data lines of bus-organized systems. With all but

one of the common outputs disabled (at a

high-impedance state), the low impedance of the

single enabled output drives the bus line to a high

or low logic level. Each output has its own

output-enable (OE) input. The output is disabled

when OE is high.

The SN54ALS253 is characterized for operation

over the full military temperature range of − 55

°C

to 125

°C. The SN74ALS253 and SN74AS253A

are characterized for operation from 0

°C to 70°C.

FUNCTION TABLE

INPUTS

OUTPUT

SELECT†

DATA

OE

OUTPUT

Y

B

A

C0

C1

C2

C3

OE

Y

X

X

X

X

X

X

H

Z

L

LL

XX

X

L

L

L

LH

XX

X

L

H

L

HX

LX

XL

L

L

HX

HX

X

L

H

H

LX

XL

XL

L

H

LX

XH

X

L

H

H

HX

XX

L

L

L

H

H

X

X

X

H

L

H

† Select inputs A and B are common to both sections.

SN54ALS253 ...J PACKAGE

SN74ALS253, SN74AS253A ...D OR N PACKAGE

(TOP VIEW)

32 1 20 19

910 11 12 13

4

5

6

7

8

18

17

16

15

14

A

2C3

NC

2C2

2C1

1C3

1C2

NC

1C1

1C0

SN54ALS253 . . . FK PACKAGE

(TOP VIEW)

NC − No internal connection

1

2

3

4

5

6

7

8

16

15

14

13

12

11

10

9

1OE

B

1C3

1C2

1C1

1C0

1Y

GND

VCC

2OE

A

2C3

2C2

2C1

2C0

2Y

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of Texas Instruments

standard warranty. Production processing does not necessarily include

testing of all parameters.