74VHC257 查看數據表（PDF） - STMicroelectronics

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74VHC257

QUAD 2 CHANNEL MULTIPLEXER (3-STATE)

STMicroelectronics 

74VHC257

DYNAMIC SWITCHING CHARACTERISTICS

Test Condition

Value

Symbol

Parameter

VCC

(V)

TA = 25°C

-40 to 85°C -55 to 125°C Unit

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

VOLP Dynamic Low

0.3 0.8

Voltage Quiet

5.0

V

VOLV Output (note 1, 2)

-0.8 -0.3

Dynamic High

VIHD Voltage Input

5.0

CL = 50 pF

3.5

V

(note 1, 3)

Dynamic Low

VILD Voltage Input

5.0

(note 1, 3)

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.

TEST CIRCUIT

TEST

tPLH, tPHL

tPZL, tPLZ

tPZH, tPHZ

CL =15/ 50pF or equivalent (includes jig and probe capacitance)

RL = R1 = 1KΩ or equivalent

RT = ZOUT of pulse generator (typically 50Ω)

6/11

SWITCH

Open

VCC

GND

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