74HC_HCT240_3

© NXP B.V. 2007. All rights reserved.

Product data sheet

Rev. 03 — 2 August 2007

4 of 18

NXP Semiconductors

74HC240; 74HCT240

Octal buffer/line driver; 3-state; inverting

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]

For DIP20 packages: above 70

°C, P

tot derates linearly with 12 mW/K.

For SO20 packages: above 70

°C, P

tot derates linearly with 8 mW/K.

For SSOP20 and TSSOP20 packages: above 60

°C, P

tot derates linearly with 5.5 mW/K.

For DHVQFN20 packages: above 60

°C, Ptot derates linearly with 4.5 mW/K.

2A0

17

data input

1Y0

18

bus output

2OE

19

output enable input (active LOW)

VCC

20

supply voltage

Table 2.

Pin description …continued

Symbol

Pin

Description

Table 3.

Function table[1]

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

VCC

supply voltage

−0.5

+7

V

IIK

input clamping current

VI < −0.5 V or VI >VCC + 0.5 V

-

±20

mA

IOK

output clamping current

VO < −0.5 V or VO >VCC + 0.5 V

-

±20

mA

IO

output current

−0.5 V < VO < VCC + 0.5 V

-

±35

mA

ICC

supply current

-

70

mA

IGND

ground current

−70

-

mA

Tstg

storage temperature

−65

+150

°C

Ptot

total power dissipation

[1]

DIP20 package

-

750

mW

SO20, SSOP20, TSSOP20

and DHVQFN20 packages

-

500

mW