74ACT244T 查看數據表（PDF） - STMicroelectronics

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74ACT244T

OCTAL BUS BUFFER WITH 3 STATE OUTPUTS (NON INVERTED)

STMicroelectronics 

74ACT244

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

Symb ol

Parameter

tPLH Propagation Delay Time

tPHL

tPZL Output Enable Time

tPZH

tPLZ Output Disable Time

tPHZ

(*) Voltage range is 5V ± 0.5V

T est Con ditio n

VCC

(V)

5.0(*)

5.0(*)

5.0(*)

Valu e

TA = 25 oC

-40 to 85 oC

Min. T yp. Max. Min. Max.

1.5 4.5 9.0 1.5 10.0

Unit

ns

1.5 5.5 9.0 1.5 10.0 ns

1.5 6.5 10.0 1.5 11.0 ns

CAPACITIVE CHARACTERISTICS

Symb ol

Parameter

Test Conditions

VCC

(V)

Valu e

TA = 25 oC

-40 to 85 oC

Min. T yp. Max. Min. Max.

Unit

CIN Input Capacitance

5.0

4

pF

Ci/o I/O Capacitance

5.0

8

pF

CPD Power Dissipation

5.0

Capacitance (note 1)

24

pF

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)

TEST CIRCUIT

TEST

tPLH, tPHL

tPZL, tPLZ

tPZH, tPHZ

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

RL = R1 = 500Ω orequivalent

RT = ZOUT of pulse generator (typically 50Ω)

4/9

SW IT CH

Open

2VCC

Open

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