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© Koninklijke Philips Electronics N.V. 2005. All rights reserved.

Product data sheet

Rev. 03 — 31 January 2005

5 of 22

Philips Semiconductors

74HC245; 74HCT245

Octal bus tranceiver; 3-state

7.

Functional description

7.1 Function table

[1]

H = HIGH voltage level;

L = LOW voltage level;

X = don’t care;

Z = high-impedance OFF-state.

8.

Limiting values

[1]

For DIP20 packages: above 70

°C, Ptot derates linearly with 12 mW/K.

For SO20 packages: above 70

°C, Ptot derates linearly with 8 mW/K.

For SSOP20 and TSSOP20 packages: above 60

°C, Ptot derates linearly with 5.5 mW/K.

For DHVQFN20 packages: above 60

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

B1

17

data input/output

B0

18

data input/output

OE

19

output enable input (active LOW)

VCC

20

supply voltage

Table 3:

Pin description …continued

Symbol

Pin

Description

Table 4:

Function table [1]

Input

Input/output

OE

DIR

An

Bn

L

L

A = B

input

L

H

input

B = A

HX

Z

Z

Table 5:

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 diode current

VI < −0.5 V or VI >VCC + 0.5 V

-

±20

mA

IOK

output diode current

VO < −0.5 V or

VO >VCC + 0.5 V

-

±20

mA

IO

output source or sink

current

VO = −0.5 V to VCC + 0.5 V

-

±35

mA

ICC, IGND

VCC or GND 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