TC74HCT244AF datasheet(5/8 Pages) TOSHIBA

No de pièce	TC74HCT244AF

Description	Octal Bus Buffer with TTL Input Level

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Fabricant	TOSHIBA [Toshiba Semiconductor]

Site Internet	http://www.semicon.toshiba.co.jp/eng

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TC74HCT240,244AP/AF

2007-10-01

5

AC Characteristics (input: tr = tf = 6 ns)

Test Condition

Ta

= 25°C

Ta

= −40~85°C

Characteristics

Symbol

CL

(pF)

VCC

(V)

Min

Typ.

Max

Min

Max

Unit

Output transition time

tTLH

tTHL

⎯

50

4.5

5.5

⎯

7

6

12

11

⎯

15

14

ns

50

4.5

5.5

⎯

15

13

22

20

⎯

28

25

Propagation delay

time

(Note 2)

tpLH

tpHL

⎯

150

4.5

5.5

⎯

21

16

30

27

⎯

38

34

ns

50

4.5

5.5

⎯

15

13

25

22

⎯

31

28

Propagation delay

time

(Note 3)

tpLH

tpHL

⎯

150

4.5

5.5

⎯

21

18

33

29

⎯

41

37

ns

50

4.5

5.5

⎯

17

14

30

27

⎯

38

34

3-state output enable

time

tpZL

tpZH

RL = 1 kΩ

150

4.5

5.5

⎯

23

20

38

34

⎯

48

43

ns

3-state output disable

time

tpLZ

tpHZ

RL = 1 kΩ

50

4.5

5.5

⎯

16

13

30

27

⎯

38

34

ns

Input capacitance

CIN

⎯

5

10

⎯

10

pF

Output capacitance

COUT

⎯

10

⎯

pF

(Note 2)

⎯

33

⎯

Power dissipation

capacitance

(Note 1)

CPD

(Note 3)

⎯

31

⎯

pF

Note 1: CPD is defined as the value of the internal equivalent capacitance which is calculated from the operating

current consumption without load.

Average operating current can be obtained by the equation:

ICC (opr) = CPD･VCC･fIN + ICC/8 (per bit)

Note 2: TC74HCT240A

Note 3: TC74HCT244A

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