74F244 datasheet(6/12 Pages) PHILIPS

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Philips Semiconductors

Product specification

74F244/74F244B

Octal buffers (3-State)

1994 Dec 5

AC ELECTRICAL CHARACTERISTICS FOR 74F244

A PORT LIMITS

Tamb = +25°C

Tamb = 0°C to +70°C

Tamb = -40°C to +85°C

SYMBOL

PARAMETER

TEST

VCC = +5.0V

VCC = +5.0V ± 10%

UNIT

CONDITION

CL = 50pF,

RL = 500Ω

CL = 50pF,

RL = 500Ω

CL = 50pF,

RL = 500Ω

MIN

TYP

MAX

MIN

MAX

MIN

MAX

tPLH

tPHL

Propagation delay

Ian, Ibn to Yn

Waveform 1

2.5

4.0

5.2

2.0

6.2

6.5

1.5

2.0

7.0

tPZH

tPZL

Output enable time

to high or low

Waveform 2

Waveform 4

2.0

4.3

5.0

5.7

7.0

2.0

6.7

8.0

2.0

8.0

8.5

tPHZ

tPLZ

Output disable time

from high or low

Waveform 2

Waveform 4

1.5

2.5

5.5

1.0

6.0

5.5

1.0

6.0

5.5

AC ELECTRICAL CHARACTERISTICS FOR 74F244B

LIMITS

Tamb = +25°C

Tamb = 0°C to +70°C

SYMBOL

PARAMETER

TEST

VCC = +5.0V

VCC = +5.0V ± 10%

UNIT

CONDITION

CL = 50pF, RL = 500Ω

MIN

TYP

MAX

MIN

MAX

tPLH

tPHL

Propagation delay

Ian, Ibn to Yn

Waveform 1

2.5

4.5

5.7

6.0

2.0

2.5

6.2

6.5

tPZH

tPZL

Output enable time

to high or low level

Waveform 2

Waveform 4

2.0

3.0

4.0

5.5

6.0

7.5

2.0

3.0

6.5

8.0

tPHZ

tPLZ

Output disable time

from high or low level

Waveform 2

Waveform 4

1.5

2.5

5.5

1.0

6.0

5.5

tsk(0)

Output skew1, 2

Waveform 3

1.5

2.0

NOTES:

1. |tPN actual - tPM actual| for any output compared to any other output where N and M are either LH or HL.

2. Skew times are valid only under same test conditions (temperature, VCC, loading, etc.,).

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