74AC240 datasheet(4/9 Pages) STMICROELECTRONICS

4 / 9 page

74AC240

4/9

AC ELECTRICAL CHARACTERISTICS (CL = 50 pF, RL = 500 Ω, Input tr = tf = 3ns)

(*) Voltage range is 3.3V

± 0.3V

(**) Voltage range is 5.0V

± 0.5V

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)

TEST CIRCUIT

CL = 50pF or equivalent (includes jig and probe capacitance)

RL = R1 = 500Ω or equivalent

RT = ZOUT of pulse generator (typically 50Ω)

Symbol

Parameter

Test Condition

Value

Unit

VCC

(V)

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(*)

1.5

5.7

8.0

1.5

9.0

1.5

11.0

5.0(**)

1.5

4.2

6.5

1.5

7.0

1.5

8.5

tPZL tPZH Output Enable

Time

3.3(*)

1.5

7.0

10.5

1.5

11.0

1.5

13.0

5.0(**)

1.5

5.0

8.0

1.5

8.5

1.5

10.5

tPLZ tPHZ Output Disable

Time

3.3(*)

1.5

7.0

10.5

1.5

11.5

1.5

13.5

5.0(**)

1.5

6.5

9.0

1.5

9.5

1.5

11.0

Symbol

Parameter

Test Condition

Value

Unit

VCC

(V)

TA = 25°C

-40 to 85°C

-55 to 125°C

Min.

Typ.

Max.

Min.

Max.

Min.

Max.

CIN

Input Capacitance

5.0

COUT

Output

Capacitance

5.0

CPD

Power Dissipation

Capacitance (note

5.0

fIN = 10MHz

TEST

SWITCH

tPLH, tPHL

Open

tPZL, tPLZ

2VCC

tPZH, tPHZ

Open

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