MC74HCT245ADT 查看數據表（PDF） - ON Semiconductor

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MC74HCT245ADT

Octal 3−State Noninverting Bus Transceiver with LSTTL Compatible Inputs

ON Semiconductor 

MC74HCT245A

SWITCHING WAVEFORMS

tr

INPUT

A OR B

tPLH

OUTPUT

B OR A

2.7 V

1.3 V

0.3 V

90%

1.3 V

10%

tTLH

Figure 2.

tf

3.0 V

GND

tPHL

tTHL

DIRECTION

OUTPUT

ENABLE

A OR B

A OR B

1.3 V

1.3 V

tPZL

tPLZ

1.3 V

tPZH tPHZ

1.3 V

3.0 V

1.3 V

GND

3.0 V

GND

HIGH

IMPEDANCE

10% VOL

90% VOH

HIGH

IMPEDANCE

Figure 3.

DEVICE

UNDER

TEST

TEST POINT

OUTPUT

CL*

*Includes all probe and jig capacitance

Figure 4.

DEVICE

UNDER

TEST

TEST POINT

OUTPUT

1 kW

CL*

CONNECT TO VCC WHEN

TESTING tPLZ AND tPZL.

CONNECT TO GND WHEN

TESTING tPHZ AND tPZH.

*Includes all probe and jig capacitance

Figure 5. Test Circuit

http://onsemi.com

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