74HC643 datasheet(5/6 Pages) PHILIPS

5 / 6 page

December 1990

Philips Semiconductors

Product speciﬁcation

Octal bus transceiver; 3-state;

true/inverting

74HC/HCT643

DC CHARACTERISTICS FOR 74HCT

For the DC characteristics see

“74HC/HCT/HCU/HCMOS Logic Family Specifications”.

Output capability: bus driver

ICC category: MSI

Note to HCT types

The value of additional quiescent supply current (

∆ICC) for a unit load of 1 is given in the family specifications.

To determine

∆ICC per input, multiply this value by the unit load coefficient shown in the table below.

AC CHARACTERISTICS FOR 74HCT

GND = 0 V; tr =tf = 6 ns; CL =50pF

INPUT

UNIT LOAD COEFFICIENT

DIR

1.50

0.40

1.50

0.90

SYMBOL

PARAMETER

Tamb (°C)

UNIT

TEST CONDITIONS

74HCT

VCC

(V)

WAVEFORMS

+25

−40 to +85 −40 to +125

min.

typ.

max. min. max. min.

max.

tPHL/ tPLH

propagation delay

An to Bn;

inverting

4.5

Fig.5

tPHL/ tPLH

propagation delay

Bn to An;

non-inverting (true)

4.5

Fig.6

tPZH/ tPZL

3-state output enable time

OE, DIR to An;

OE, DIR to Bn

4.5

Fig.7

tPHZ/ tPLZ

3-state output disable time

OE, DIR to An;

OE, DIR to Bn

4.5

Fig.7

tTHL/ tTLH

output transition time

4.5

Fig.5 and Fig.6

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