CD54HC245_16 datasheet(6/17 Pages) TI1

No de pièce	CD54HC245

Description	High-Speed CMOS Logic Octal-Bus Transceiver, Three-State, Non-Inverting

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Fabricant	TI1 [Texas Instruments]

Site Internet	http://www.ti.com

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Test Circuits and Waveforms

FIGURE 1. HC TRANSITION TIMES AND PROPAGATION

DELAY TIMES, COMBINATION LOGIC

FIGURE 2. HCT TRANSITION TIMES AND PROPAGATION

DELAY TIMES, COMBINATION LOGIC

FIGURE 3. HC THREE-STATE PROPAGATION DELAY

WAVEFORM

FIGURE 4. HCT THREE-STATE PROPAGATION DELAY

WAVEFORM

NOTE:

Open drain waveforms tPLZ and tPZL are the same as those for three-state shown on the left. The test circuit is Output RL =1kΩ to

VCC, CL = 50pF.

FIGURE 5. HC AND HCT THREE-STATE PROPAGATION DELAY TEST CIRCUIT

tPHL

tPLH

tTHL

tTLH

90%

50%

10%

50%

10%

INVERTING

OUTPUT

INPUT

GND

VCC

tr = 6ns

tf = 6ns

90%

tPHL

tPLH

tTHL

tTLH

2.7V

1.3V

0.3V

1.3V

10%

INVERTING

OUTPUT

INPUT

GND

3V

tr = 6ns

tf = 6ns

90%

50%

10%

90%

GND

VCC

10%

90%

50%

OUTPUT

DISABLE

OUTPUT LOW

TO OFF

OUTPUT HIGH

TO OFF

OUTPUTS

ENABLED

OUTPUTS

DISABLED

OUTPUTS

ENABLED

6ns

tPZH

tPHZ

tPZL

tPLZ

0.3

2.7

GND

3V

10%

90%

1.3V

OUTPUT

DISABLE

OUTPUT LOW

TO OFF

OUTPUT HIGH

TO OFF

OUTPUTS

ENABLED

OUTPUTS

DISABLED

OUTPUTS

ENABLED

tr

6ns

tPZH

tPHZ

tPZL

tPLZ

6ns

tf

1.3

IC WITH

THREE-

STATE

OUTPUT

OTHER

INPUTS

TIED HIGH

OR LOW

OUTPUT

DISABLE

VCC FOR tPLZ AND tPZL

GND FOR tPHZ AND tPZH

OUTPUT

RL = 1kΩ

CL

50pF

CD54HC245, CD74HC245, CD54HCT245, CD74HCT245

Numéro de pièce similaire - CD54HC245_16

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Description similaire - CD54HC245_16

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