5-1

FAST AND LS TTL DATA

ONE-OF-TEN DECODER

The LSTTL / MSI SN54 / 74LS42 is a Multipurpose Decoder designed to ac-

cept four BCD inputs and provide ten mutually exclusive outputs. The LS42

is fabricated with the Schottky barrier diode process for high speed and is

completely compatible with all Motorola TTL families.

• Multifunction Capability

• Mutually Exclusive Outputs

• Demultiplexing Capability

• Input Clamp Diodes Limit High Speed Termination Effects

14

13

12

11

10

9

12345

6

VCC

7

16

15

8

A0

A1

A2

A3

9

8

7

0

1

2

3

4

5

6

GND

NOTE:

The Flatpak version has the

same pinouts (Connection

Diagram) as the Dual In-Line

Package.

CONNECTION DIAGRAM DIP (TOP VIEW)

PIN NAMES

LOADING (Note a)

HIGH

LOW

A0 – A3

0 to 9

Address Inputs

Outputs, Active LOW (Note b)

0.5 U.L.

10 U.L.

0.25 U.L.

5(2.5) U.L.

NOTES:

a) 1 TTL Unit Load (U.L.) = 40

µA HIGH/1.6 mA LOW.

b) The Output LOW drive factor is 2.5 U.L. for Military (54) and 5 U.L. for Commercial (74)

Temperature Ranges.

3

LOGIC DIAGRAM

14

45

10

11

12

13

15

12

67

9

1

2

3

4

5

6

0

A0

A1

A2

A3

9

8

7

VCC = PIN 16

GND = PIN 8

= PIN NUMBERS

SN54/74LS42

ONE-OF-TEN DECODER

LOW POWER SCHOTTKY

J SUFFIX

CERAMIC

CASE 620-09

N SUFFIX

PLASTIC

CASE 648-08

16

1

16

1

ORDERING INFORMATION

SN54LSXXJ

Ceramic

SN74LSXXN

Plastic

SN74LSXXD

SOIC

16

1

D SUFFIX

SOIC

CASE 751B-03

LOGIC SYMBOL

VCC = PIN 16

GND = PIN 8

15

14

13

12

01 2 3 4 5 6 7 8 9

1 2 3 4 56 79 10 11

A0 A1

A2

A3