74ACT244B datasheet(4/9 Pages) STMICROELECTRONICS

tên linh kiện	74ACT244B

Giải thích chi tiết về linh kiện	OCTAL BUS BUFFER WITH 3 STATE OUTPUTS NON INVERTED

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TEST CIRCUIT

T EST

SW IT CH

tPLH,tPHL

Open

tPZL,tPLZ

2VCC

tPZH,tPHZ

Open

CL = 50 pF or equivalent (includes jigand probe capacitance)

RL =R1 =500

Ω orequivalent

RT =ZOUT of pulse generator (typically 50

Ω)

CAPACITIVE CHARACTERISTICS

Symb ol

Parameter

Test Co nditi ons

Valu e

Un it

VCC

(V)

TA =25

-40 to 85

Min.

T yp.

Max.

Mi n.

Max.

CIN

Input Capacitance

5.0

Ci/o

I/O Capacitance

5.0

CPD

Power Dissipation

Capacitance (note 1)

5.0

1) CPD isdefined as the value of the IC’sinternal equivalent capacitance which is calculated fromthe operating current consumption without load. (Referto

Test Circuit).Average operating current can be obtained by the following equation. ICC(opr) = CPD

• VCC • fIN +ICC/n (per circuit)

AC ELECTRICAL CHARACTERISTICS (CL = 50 pF, RL = 500

Ω, Input tr =tf =3 ns)

Symb ol

Parameter

T est Con ditio n

Valu e

Un it

VCC

(V)

TA =25

-40 to 85

Min.

T yp.

Max.

Mi n.

Max.

tPLH

tPHL

Propagation Delay Time

5.0

(*)

1.5

4.5

9.0

1.5

10.0

tPZL

tPZH

Output Enable Time

5.0

(*)

1.5

5.5

9.0

1.5

10.0

tPLZ

tPHZ

Output Disable Time

5.0

(*)

1.5

6.5

10.0

1.5

11.0

(*) Voltage range is 5V

± 0.5V

74ACT244

4/9

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