74LS540 datasheet(3/3 Pages) ONSEMI

Part #	74LS540

Description	OCTAL BUFFER/LINE DRIVER WITH 3-STATE OUTPUTS

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AC WAVEFORMS

1.5 V

1.3 V

VIN

VOUT

tPLH

tPHL

1.3 V

VIN

VOUT

SW2

CL*

5 k

Ω

SW1

VCC

RL

TO OUTPUT

UNDER TEST

1.3 V

tPLH

tPHL

VE

VOUT

VE

VOUT

tPHZ

1.5 V

tPZL

tPLZ

VOL

1.5 V

≥VOH

0.5 V

tPZH

1.3 V

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

≈ 1.5 V

0.5 V

≈ 1.5 V

SWITCH POSITIONS

5-3

FAST AND LS TTL DATA

SN54/74LS540

• SN54/74LS541

AC CHARACTERISTICS (TA = 25°C)

Sb l

P

Limits

Ui

T

C

di i

Symbol

Parameter

Min

Typ

Max

Unit

Test Conditions

tPLH

Pi

D l

LS540

9.0

15

V5 0 V

tPLH

Propagation Delay,

LS541

12

15

ns

V5 0 V

tPHL

pg

y,

Data to Output

LS540

12

15

ns

V5 0 V

tPHL

LS541

12

18

VCC = 5.0 V

CL =45pF

tPZH

Output Enable Time

LS540

15

25

ns

CL = 45 pF

RL = 667 Ω

tPZH

p

to HIGH Level

LS541

15

32

ns

L

tPZL

Output Enable Time

LS540

20

38

ns

tPZL

p

to LOW Level

LS541

20

38

ns

tPHZ

Output Disable Time

LS540

10

18

ns

C5 0 F

tPHZ

p

to HIGH Level

LS541

10

18

ns

CL =5 0pF

tPLZ

Output Disable Time

LS540

15

25

ns

CL = 5.0 pF

tPLZ

p

to LOW Level

LS541

15

29

ns

SYMBOL

SW1

SW2

tPZH

Open

Closed

tPZL

Closed

Open

tPLZ

Closed

tPHZ

Closed

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