74AC240M(1997) 查看數據表（PDF） - STMicroelectronics

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74AC240M
(Rev.:1997)

OCTAL BUS BUFFER WITH 3 STATE OUTPUTS (INVERTED)

STMicroelectronics 

74AC240

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

Symbol

P ar ame te r

tPLH Propagation Delay Time

tPHL

tPZL Output Enable Time

tPZH

tPLZ Output Disable Time

tPHZ

(*) Voltage range is 3.3V ± 0.3V

(**) Voltage range is 5V ± 0.5V

Test Condition

V CC

(V)

3.3(*)

5.0(**)

3.3(*)

5.0(**)

3.3(*)

5.0(**)

Value

TA = 25 oC

-40 to 85 oC

Min. Typ. Max. Min. Max.

1.5 5

8 1.5 9

1.5 4 6.5 1.5 7

1.5 7 10.5 1.5 11.5

1.5 5

8 1.5 8.5

1.5 7 10.5 1.5 11.5

1.5 6

9 1.5 9.5

Unit

ns

ns

ns

CAPACITIVE CHARACTERISTICS

S ymb ol

Parameter

Test Cond ition s

VCC

(V )

Value

TA = 25 oC

-40 to 85 oC

Min . Typ. Max. Min. Max.

Un it

CIN Input Capacitance

5.0

4

pF

COUT Output Capacitance

5.0

8

pF

CPD Power Dissipation

5.0

Capacitance (note 1)

21

pF

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 • VCC • fIN + ICC/n (per circuit)

TEST CIRCUIT

T E ST

tPLH, tPHL

tPZL, tPLZ

tPZH, tPHZ

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

RL = R1 = 500Ω or equivalent

RT = ZOUT of pulse generator (typically 50Ω)

4/8

SWITCH

Open

2VCC

Open

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