MC74HC251 Ver la hoja de datos (PDF) - Motorola => Freescale

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MC74HC251

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

Motorola => Freescale 

MC54/74HC251

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INPUT D

tPLH

OUTPUT Y

90%

50%

10%

90%

50%

10%

tTLH

SWITCHING WAVEFORMS

tf

VCC

GND

tPHL

tTHL

tr

INPUT D

tPHL

OUTPUT Y

90%

50%

10%

90%

50%

10%

tTLH

tf

VCC

GND

tPLH

tTHL

Figure 1.

INPUT A

tPLH

OUTPUT

Y OR Y

VALID

50%

50%

VALID

VCC

GND

tPHL

Figure 3.

OUTPUT

ENABLE

Y OR Y

Y OR Y

Figure 2.

50%

tPZL tPLZ

50%

tPZH tPHZ

50%

Figure 4.

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 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 5.

* Includes all probe and jig capacitance

Figure 6.

MOTOROLA

4

High–Speed CMOS Logic Data

DL129 — Rev 6

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