74VHC244MTR datasheet(4/12 Pages) STMICROELECTRONICS

Part #	74VHC244MTR

Description	OCTAL BUS BUFFER WITH 3 STATE OUTPUTS (NON INVERTED)

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74VHC244

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Table 7: AC Electrical Characteristics (Input tr = tf = 3ns)

(*) Voltage range is 3.3V

± 0.3V

(**) Voltage range is 5.0V

± 0.5V

Note 1: Parameter guaranteed by design. tsoLH = |tpLHm - tpLHn|, tsoHL = |tpHLm - tpHLn|

Table 8: Capacitive Characteristics

1) CPD is defined as the value of the IC’s internal equivalent capacitance which is calculated from the operating current consumption without

load. (Refer to Test Circuit). Average operating current can be obtained by the following equation. ICC(opr) = CPD x VCC x fIN + ICC/8 (per circuit)

Symbol

Parameter

Test Condition

Value

Unit

VCC

(V)

CL

(pF)

TA = 25°C

-40 to 85°C

-55 to 125°C

Min.

Typ.

Max.

Min.

Max.

Min.

Max.

tPLH

tPHL

Propagation Delay

Time

3.3(*)

15

5.8

8.4

1.0

10.0

1.0

10.0

ns

3.3(*)

50

8.3

11.9

1.0

13.5

1.0

13.5

5.0(**)

15

3.9

5.5

1.0

6.5

1.0

6.5

5.0(**)

50

5.4

7.5

1.0

8.5

1.0

8.5

tPZL

tPZH

Output Enable

Time

3.3(*)

15

RL = 1KΩ

6.6

10.6

1.0

12.5

1.0

12.5

ns

3.3(*)

50

RL = 1KΩ

9.1

14.1

1.0

16.0

1.0

16.0

5.0(**)

15

RL = 1KΩ

4.7

7.3

1.0

8.5

1.0

8.5

5.0(**)

50

RL = 1KΩ

6.2

9.3

1.0

10.5

1.0

10.5

tPLZ

tPHZ

Output Disable

Time

3.3(*)

50

RL = 1KΩ

10.3

14.0

1.0

16.0

1.0

16.0

ns

5.0(**)

50

RL = 1KΩ

6.7

9.2

1.0

10.5

1.0

10.5

tOSLH

tOSHL

Output to Output

Skew time (note 1)

3.3(*)

50

1.5

ns

5.0(**)

50

1.0

Symbol

Parameter

Test Condition

Value

Unit

TA = 25°C

-40 to 85°C

-55 to 125°C

Min.

Typ.

Max.

Min.

Max.

Min.

Max.

CIN

Input Capacitance

410

10

pF

COUT

Output

Capacitance

6pF

CPD

Power Dissipation

Capacitance

(note 1)

19

pF

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