MC74HCT240 查看數據表（PDF） - Motorola => Freescale

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MC74HCT240

Octal 3-State Inverting Buffer/Line Driver/Line Receiver with LSTTL-Compatible Inputs

Motorola => Freescale 

MC74HCT240A

INPUT

A OR B

tPHL

OUTPUT

YA OR YB

tTHL

tr

2.7 V

1.3 V

0.3 V

90%

1.3 V

10%

Figure 1.

SWITCHING WAVEFORMS

tf

3V

GND

tPLH

tTLH

ENABLE

A OR B

OUTPUT Y

OUTPUT Y

1.3 V

tPZL tPLZ

1.3 V

tPZH tPHZ

1.3 V

Figure 2.

3V

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

LOGIC DETAIL

TO THREE OTHER

A OR B INVERTERS

* Includes all probe and jig capacitance

Figure 4. Test Circuit

INPUT

A OR B

ONE OF 8

INVERTERS

VCC

YA

OR

YB

OUTPUT ENABLES

ENABLE A OR ENABLE B

MOTOROLA

4

High–Speed CMOS Logic Data

DL129 — Rev 6

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