MC74VHCT244A 查看數據表（PDF） - ON Semiconductor

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MC74VHCT244A

Octal Bus Buffer/Line Driver with 3−State Outputs

ON Semiconductor 

MC74VHCT244A

A or B

tPLH

YA or YB

1.5 V

1.5 V

3V

GND

tPHL

VOH

VOL

Figure 3. Switching Waveform

OEA or OEB

YA or YB

YA or YB

1.5 V

tPZL

tPLZ

1.5 V

tPZH tPHZ

1.5 V

3V

GND

HIGH

IMPEDANCE

VOL +0.3 V

VOH −0.3 V

HIGH

IMPEDANCE

Figure 4. Switching Waveform

DEVICE

UNDER

TEST

TEST POINT

OUTPUT

CL*

*Includes all probe and jig capacitance

Figure 5. Test Circuit

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 6. Test Circuit

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