74AHC_AHCT240

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Product data sheet

Rev. 2 — 26 November 2010

3 of 16

NXP Semiconductors

74AHC240; 74AHCT240

Octal buffer/line driver; inverting; 3-state

5.2 Pin description

6.

Functional description

[1]

H = HIGH voltage level; L = LOW voltage level; X = don’t care; Z = high-impedance OFF-state.

7.

Limiting values

[1]

The minimum input and output voltage ratings may be exceeded if the input and output current ratings are observed.

[2]

For SO20 package: above 70

C the value of P

For TSSOP20 package: above 60

C the value of P

For DHVQFN20 package: above 60

C the value of P

Table 2.

Pin description

Symbol

Pin

Description

1OE

1

output enable input (active LOW)

2OE

19

output enable input (active LOW)

1A0, 1A1, 1A2, 1A3 2, 4, 6, 8

data input

2A0, 2A1, 2A2, 2A3 17, 15, 13, 11

data input

1Y0, 1Y1, 1Y2, 1Y3 18, 16, 14, 12

data output

2Y0, 2Y1, 2Y2, 2Y3 3, 5, 7, 9

data output

GND

10

ground (0 V)

20

power supply

Table 3.

Function table[1]

Control

Input

Output

nOE

nAn

nYn

LLH

LH

L

HX

Z

Table 4.

Limiting values

In accordance with the Absolute Maximum Rating System (IEC 60134). Voltages are referenced to GND (ground = 0 V).

Symbol

Parameter

Conditions

Min

Max

Unit

supply voltage

0.5

+7.0

V

input voltage

0.5

+7.0

V

input clamping current

[1]

20

-

mA

output clamping current

[1] -

20

mA

output current

-

25

mA

supply current

-

75

mA

ground current

75

-

mA

storage temperature

65

+150

C

total power dissipation

[2] -

500

mW