MC74HC242 查看數據表（PDF） - Motorola => Freescale

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MC74HC242

Quad 3-State Bus Transceiver

Motorola => Freescale 

MC74HC242

A (I/O)

One of Four

Transceivers

VCC

VCC

B (I/O)

A–to–B 1

Enable

B–to–A 13

Enable

tr

Input A or B

tPHL

Output A or B

90%

50%

10%

90%

50%

10%

tTHL

Figure 2.

Figure 1. Expanded Logic Diagram

SWITCHING WAVEFORMS

tf

Output

VCC

Enable

GND

tPLH

Output A or B

Output A or B

tTLH

50%

tPZL tPLZ

50%

tPZH tPHZ

50%

50%

10%

90%

Figure 3.

VCC

GND

High

Impedance

VOL

VOH

High

Impedance

DEVICE

UNDER

TEST

TEST

POINT

OUTPUT

CL*

TEST CIRCUITS

DEVICE

UNDER

TEST

TEST

POINT

OUTPUT

1kΩ

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.

*Includes all probe and jig capacitance

Figure 5.

MOTOROLA

4

High–Speed CMOS Logic Data

DL129 — Rev 6

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