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74HCT244D

Octal buffer/line driver; 3-state

Philips Electronics 

Philips Semiconductors

Octal buffer/line driver; 3-state

Product specification

74HC/HCT244

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.

INPUT

1An

2An

1OE

2OE

UNIT LOAD COEFFICIENT

0.70

0.70

0.70

0.70

AC CHARACTERISTICS FOR 74HCT

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

Tamb (°C)

TEST CONDITIONS

SYMBOL

PARAMETER

74HCT

+25

−40 to +85

−40 to +125

UNIT

VCC

(V)

WAVEFORMS

min. typ. max. min. max. min. max.

tPHL/ tPLH

propagation delay

1An to 1Yn;

2An to 2Yn

13 22

28

33 ns 4.5 Fig.5

tPZH/ tPZL 3-state output enable time

15 30

38

45 ns 4.5 Fig.6

1OE to 1Yn;

2OE to 2Yn

tPHZ/ tPLZ 3-state output disable time

15 25

31

38 ns 4.5 Fig.6

1OE to 1Yn;

2OE to 2Yn

tTHL/ tTLH output transition time

5 12

15

18 ns 4.5 Fig.5

December 1990

6

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