74VHC257(2004) Просмотр технического описания (PDF) - STMicroelectronics

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74VHC257
(Rev.:2004)

QUAD 2 CHANNEL MULTIPLEXER (3-STATE)

STMicroelectronics 

74VHC257

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.

Figure 4: Test Circuit

tPLH, tPHL

tPZL, tPLZ

tPZH, tPHZ

TEST

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

RL = R1 = 1KΩ or equivalent

RT = ZOUT of pulse generator (typically 50Ω)

6/14

SWITCH

Open

VCC

GND

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