MC74LCX240DWR2 View Datasheet(PDF) - ON Semiconductor

Part Name

Description

Manufacturer

MC74LCX240DWR2

Low−Voltage CMOS Octal Buffer

ON Semiconductor 

MC74LCX240

VCC 2OE 1O0 2D0 1O1 2D1 1O2 2D2 1O3 2D3

20 19 18 17 16 15 14 13 12 11

1

1OE

2

1D0

4

1D1

18

1O0

16

1O1

6

1D2

14

1O2

1 2 3 4 5 6 7 8 9 10

1OE 1D0 2O0 1D1 2O1 1D2 2O2 1D3 2O3 GND

Figure 1. Pinout: 20−Lead (Top View)

8

1D3

12

1O3

19

2OE

PIN NAMES

Pins

Function

nOE

1Dn, 2Dn

1On, 2On

Output Enable Inputs

Data Inputs

3−State Outputs

17

2D0

15

2D1

13

2D2

11

2D3

3

2O0

5

2O1

7

2O2

9

2O3

Figure 2. LOGIC DIAGRAM

TRUTH TABLE

INPUTS

1OE

1Dn

2OE

2Dn

OUTPUTS

1On, 2On

L

L

H

L

H

L

H

X

Z

H = High Voltage Level

L = Low Voltage Level

Z = High Impedance State

X = High or Low Voltage Level and Transitions Are Acceptable; for ICC reasons, DO NOT FLOAT Inputs

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