74AHC244 datasheet(8/16 Pages) PHILIPS

8 / 16 page

1999 Sep 28

Philips Semiconductors

Product speciﬁcation

Octal buffer/line driver; 3-state

74AHC244; 74AHCT244

AC CHARACTERISTICS

Type 74AHC244

GND = 0 V; tr =tf ≤ 3.0 ns.

Notes

1. Typical values at VCC = 3.3 V.

2. Typical values at VCC = 5.0 V.

SYMBOL

PARAMETER

TEST CONDITIONS

Tamb (°C)

UNIT

WAVEFORMS

−40 to +85

−40 to +125

MIN.

TYP.

MAX.

MIN.

MAX.

MIN.

MAX.

VCC = 3.0 to 3.6 V; note 1

tPHL/tPLH

propagation delay

nAn to nYn

see Figs 4 and 6 15 pF

−

5.0

8.4

1.0

10.0

1.0

10.5

tPZL/tPZH

propagation delay

nOE to nYn

see Figs 5 and 6

−

6.5

10.6

1.0

12.5

1.0

13.5

tPLZ/tPHZ

propagation delay

nOE to nYn

−

5.5

9.7

1.0

11.0

1.0

12.5

tPHL/tPLH

propagation delay

nAn to nYn

see Figs 4 and 6 50 pF

−

7.0

11.9

1.0

13.5

1.0

15.0

tPZL/tPZH

propagation delay

nOE to nYn

see Figs 5 and 6

−

7.5

14.1

1.0

16.0

1.0

18.0

tPLZ/tPHZ

propagation delay

nOE to nYn

−

10.0

14.0

1.0

16.0

1.0

17.5

VCC = 4.5 to 5.5 V; note 2

tPHL/tPLH

propagation delay

nAn to nYn

see Figs 4 and 6 15 pF

−

3.4

5.5

1.0

6.5

1.0

7.0

tPZL/tPZH

propagation delay

nOE to nYn

see Figs 5 and 6

−

4.0

7.3

1.0

8.5

1.0

9.5

tPLZ/tPHZ

propagation delay

nOE to nYn

−

4.8

7.2

1.0

8.5

1.0

9.0

tPHL/tPLH

propagation delay

nAn to nYn

see Figs 4 and 6 50 pF

−

5.0

7.5

1.0

8.5

1.0

9.5

tPZL/tPZH

propagation delay

nOE to nYn

see Figs 5 and 6

−

5.5

9.3

1.0

10.5

1.0

12.0

tPLZ/tPHZ

propagation delay

nOE to nYn

−

7.0

9.2

1.0

10.5

1.0

11.5

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