MC74HC125ADTEL 查看數據表（PDF） - ON Semiconductor

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MC74HC125ADTEL

Quad 3−State Noninverting Buffers

ON Semiconductor 

MC74HC125A, MC74HC126A

SWITCHING WAVEFORMS

tr

INPUT A

tPLH

OUTPUT Y

90%

50%

10%

90%

50%

10%

tTLH

Figure 1.

tf

VCC

GND

tPHL

tTHL

OE (HC125A)

OE (HC126A)

OUTPUT Y

OUTPUT Y

50%

50%

tPZL tPLZ

50%

tPZH tPHZ

50%

Figure 2.

VCC

GND

VCC

GND

HIGH

IMPEDANCE

10% VOL

90% VOH

HIGH

IMPEDANCE

DEVICE

UNDER

TEST

TEST POINT

OUTPUT

CL*

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. Test Circuit

*Includes all probe and jig capacitance

Figure 4. Test Circuit

VCC

OE

A

Y

HC125A

(1/4 OF THE DEVICE)

VCC

OE

A

Y

HC126A

(1/4 OF THE DEVICE)

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