MC74HC240A 데이터 시트보기 (PDF) - ON Semiconductor

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MC74HC240A

Octal 3-State Inverting Buffer/Line Driver/Line Receiver

ON Semiconductor 

DATA INPUT

A OR B

tPHL

OUTPUT

YA OR YB

tTHL

tr

90%

50%

10%

90%

50%

10%

Figure 1.

MC74HC240A

SWITCHING WAVEFORMS

tf

VCC

GND

tPLH

tTLH

ENABLE

OUTPUT Y

OUTPUT Y

50%

tPZL tPLZ

50%

tPZH tPHZ

50%

Figure 2.

VCC

GND

HIGH

IMPEDANCE

10% VOL

90% VOH

HIGH

IMPEDANCE

DEVICE

UNDER

TEST

TEST POINT

OUTPUT

CL*

*Includes all probe and jig capacitance

Figure 3. Test Circuit

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 4. Test Circuit

PIN DESCRIPTIONS

INPUTS

A1, A2, A3, A4, B1, B2, B3, B4

(Pins 2, 4, 6, 8, 11, 13, 15, 17)

Data input pins. Data on these pins appear in inverted form

on the corresponding Y outputs, when the outputs are

enabled.

CONTROLS

Enable A, Enable B (Pins 1, 19)

Output enables (active–low). When a low level is applied

to these pins, the outputs are enabled and the devices

function as inverters. When a high level is applied, the

outputs assume the high–impedance state.

OUTPUTS

YA1, YA2, YA3, YA4, YB1, YB2, YB3, YB4

(Pins 18, 16, 14, 12, 9, 7, 5, 3)

Device outputs. Depending upon the state of the

output–enable pins, these outputs are either inverting

outputs or high–impedance outputs.

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