74VHC245TTR datasheet(5/12 Pages) STMICROELECTRONICS

부품명	74VHC245TTR

상세설명	OCTAL BUS TRANSCEIVER (3-STATE)

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74VHC245

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Table 9: Dynamic Switching Characteristics

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 3: Test Circuit

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

RL = R1 = 1KΩ or equivalent

RT = ZOUT of pulse generator (typically 50Ω)

Symbol

Parameter

Test Condition

Value

Unit

VCC

(V)

TA = 25°C

-40 to 85°C

-55 to 125°C

Min.

Typ.

Max.

Min.

Max.

Min.

Max.

VOLP

Dynamic Low

Voltage Quiet

Output (note 1, 2)

5.0

CL = 50 pF

0.6

0.9

V

VOLV

-0.9

-0.6

VIHD

Dynamic High

Voltage Input

(note 1, 3)

5.0

3.5

V

VILD

Dynamic Low

Voltage Input

(note 1, 3)

5.0

1.5

V

TEST

SWITCH

tPLH, tPHL

Open

tPZL, tPLZ

VCC

tPZH, tPHZ

GND

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STMicroelectronics	74VHC245T	66Kb / 8P	OCTAL BUS TRANSCEIVER 3-STATE June 1999

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