74VHCT257A(2004) Просмотр технического описания (PDF) - STMicroelectronics

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74VHCT257A
(Rev.:2004)

QUAD 2 CHANNEL MULTIPLEXER (3-STATE)

STMicroelectronics 

74VHCT257A

Table 8: Capacitive Characteristics

Test Condition

Value

Symbol

Parameter

CIN

COUT

CPD

Input Capacitance

Output

Capacitance

Power Dissipation

Capacitance

(note 1)

TA = 25°C

-40 to 85°C -55 to 125°C Unit

Min. Typ. Max. Min. Max. Min. Max.

4 10

10

10 pF

6

pF

23

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 x VCC x fIN + ICC/4 (per

Channel)

Table 9: Dynamic Switching Characteristics

Symbol

Parameter

VOLP

VOLV

VIHD

VILD

Dynamic Low

Voltage Quiet

Output (note 1, 2)

Dynamic High

Voltage Input

(note 1, 3)

Dynamic Low

Voltage Input

(note 1, 3)

Test Condition

VCC

(V)

5.0

5.0

CL = 50 pF

5.0

Value

TA = 25°C

-40 to 85°C -55 to 125°C Unit

Min. Typ. Max. Min. Max. Min. Max.

0.3 0.8

-0.8 -0.3

2.0

V

0.8

1) Worst case package.

2) Max number of outputs defined as (n). Data inputs are driven 0V to 3.0V, (n-1) outputs switching and one output at GND.

3) Max number of data inputs (n) switching. (n-1) switching 0V to 3.0V. Inputs under test switching: 3.0V to threshold (VILD), 0V to threshold

(VIHD), f=1MHz.

5/13

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