MC74HC245AFL2 查看數據表（PDF） - ON Semiconductor

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MC74HC245AFL2

Octal 3-State NonInverting Bus Transceiver

ON Semiconductor 

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INPUT

A OR B

tPLH

OUTPUT

B OR A

90%

50%

10%

90%

50%

10%

tTLH

Figure 1.

MC74HC245A

SWITCHING WAVEFORMS

tf

VCC

GND

tPHL

tTHL

DIRECTION

OUTPUT

ENABLE

A OR B

A OR B

50%

50%

tPZL tPLZ

50%

10%

tPZH tPHZ

90%

50%

Figure 2.

VCC

GND

VCC

GND

HIGH

IMPEDANCE

VOL

VOH

HIGH

IMPEDANCE

DEVICE

UNDER

TEST

TEST POINT

OUTPUT

CL*

TEST CIRCUITS

DEVICE

UNDER

TEST

TEST POINT

OUTPUT

1 kΩ

CL*

CONNECT TO VCC WHEN

TESTING tPLZ AND tPZL.

CONNECT TO GND WHEN

TESTING tPHZ AND tPZH.

*Includes all probe and jig capacitance

Figure 3.

*Includes all probe and jig capacitance

Figure 4.

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