74ACT257M datasheet(5/10 Pages) STMICROELECTRONICS

5 / 10 page

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

Ω, Input tr =tf =3 ns)

Symbol

Parameter

T est Cond iti on

Value

Unit

VCC

(V)

TA =25

oC-40 to 85 oC

Mi n.

Typ.

Max.

Min .

Max.

tPLH

tPHL

Propagation Delay Time

A, B to Y

5.0

(*)

5.0

7.0

8.0

tPLH

tPHL

Propagation Delay Time

SEL to Y

5.0

(*)

6.0

9.0

10.0

tPZL

tPZH

Output Enable Time

5.0

(*)

5.0

8.0

9.0

tPLZ

tPHZ

Output Disable Time

5.0

(*)

6.0

9.0

10.0

(*) Voltage range is 5V

± 0.5V

TEST CIRCUIT

TEST

SWI TCH

tPLH,tPHL

Open

tPZL,tPLZ

2VCC

tPZH,tPHZ

Open

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

RL =R1 = 500

Ω or equivalent

RT =ZOUT of pulse generator (typically 50

Ω)

CAPACITIVE CHARACTERISTICS

Symbol

Parameter

Test Con dition s

Value

Unit

VCC

(V)

TA =25

oC-40 to 85 oC

Mi n.

Typ.

Max.

Min .

Max.

CIN

Input Capacitance

5.0

COUT

Input Capacitance

5.0

CPD

Power Dissipation

Capacitance (note 1)

5.0

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)

74ACT257

5/10

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