74VHC125 查看數據表（PDF） - STMicroelectronics

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74VHC125

QUAD BUS BUFFERS (3-STATE)

STMicroelectronics 

74VHC125

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.

6 10

10

10 pF

8

pF

16

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 circuit)

Table 9: Dynamic Switching Characteristics

Test Condition

Value

Symbol

Parameter

VCC

(V)

VOLP Dynamic Low

Voltage Quiet

5.0

VOLV Output (note 1, 2)

Dynamic High

VIHD Voltage Input

5.0

(note 1, 3)

Dynamic Low

VILD Voltage Input

5.0

(note 1, 3)

CL = 50 pF

TA = 25°C

-40 to 85°C -55 to 125°C Unit

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

0.3 0.8

V

-0.8 -0.3

3.5

V

1.5

V

1) Worst case package.

2) Max number of outputs defined as (n). Data inputs are driven 0V to 5.0V, (n-1) outputs switching and one output at GND.

3) Max number of data inputs (n) switching. (n-1) switching 0V to 5.0V. Inputs under test switching: 5.0V to threshold (VILD), 0V to threshold

(VIHD), f=1MHz.

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