CD74HC540M datasheet(6/8 Pages) TI

Part #	CD74HC540M

Description	High Speed CMOS Logic Octal Buffer and Line Drivers, Three-State

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Manufacturer	TI [Texas Instruments]

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6

Three-State Output

Capacitance

CO

-

20

-

20

-

20

-

20

pF

Power Dissipation Capacitance

(Notes 4, 5) (540, 541)

CPD

CL = 15pF

5

-

55

-

pF

NOTES:

4. CPD is used to determine the dynamic power consumption, per channel.

5. PD = VCC

2 f

i (CPD + CL) where fi = Input Frequency, CL = Output Load Capacitance, VCC = Supply Voltage.

Switching Speciﬁcations CL = 50pF, Input tr, tf = 6ns (Continued)

PARAMETER

SYMBOL

TEST

CONDITIONS

VCC (V)

25oC

-40oC TO

85oC

-55oC TO

125oC

UNITS

MIN

TYP

MAX

MIN

MAX

MIN

MAX

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

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

CD74HC540, CD74HCT540, CD74HC541, CD74HCT541

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