74VHC245TTR datasheet(4/12 Pages) STMICROELECTRONICS

номер детали	74VHC245TTR

подробное описание детали	OCTAL BUS TRANSCEIVER (3-STATE)

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74VHC245

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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

4.0

5.5

1.0

6.5

1.0

6.5

5.0(**)

50

5.5

7.5

1.0

8.5

1.0

8.5

tPZL

tPZH

Output Disable

Time

3.3(*)

15

RL = 1KΩ

8.5

13.2

1.0

15.5

1.0

15.5

ns

3.3(*)

50

RL = 1KΩ

11.0

16.7

1.0

19.0

1.0

19.0

5.0(**)

15

RL = 1KΩ

5.8

8.5

1.0

10.0

1.0

10.0

5.0(**)

50

RL = 1KΩ

7.3

10.6

1.0

12.0

1.0

12.0

tPLZ

tPHZ

Output Enable

Time

3.3(*)

50

RL = 1KΩ

11.5

15.8

1.0

18.0

1.0

18.0

ns

5.0(**)

50

RL = 1KΩ

7.0

9.7

1.0

11.0

1.0

11.0

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

CI/O

Output

Capacitance

8pF

CPD

Power Dissipation

Capacitance

(note 1)

21

pF

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