MC74HC251ADR2G(2010) 查看數據表（PDF） - ON Semiconductor

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MC74HC251ADR2G
(Rev.:2010)

8-Input Data Selector/Multiplexer with 3-State Outputs

ON Semiconductor 

MC74HC251A

SWITCHING WAVEFORMS

tr

INPUT D

tPLH

OUTPUT Y

90%

50%

10%

90%

50%

10%

tTLH

tf

VCC

GND

tPHL

tTHL

tr

INPUT D

tPHL

OUTPUT Y

90%

50%

10%

90%

50%

10%

tTLH

tf

VCC

GND

tPLH

tTHL

Figure 2.

INPUT A

tPLH

OUTPUT

Y OR Y

VALID

50%

50%

VALID

VCC

GND

tPHL

Figure 4.

OUTPUT

ENABLE

Y OR Y

Y OR Y

Figure 3.

50%

tPZL

tPLZ

50%

tPZH

tPHZ

50%

Figure 5.

VCC

GND

HIGH

IMPEDANCE

10% VOL

90% VOH

HIGH

IMPEDANCE

DEVICE

UNDER

TEST

TEST POINT

OUTPUT

CL*

TEST CIRCUITS

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.

*Includes all probe and jig capacitance

Figure 7.

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