74HC_HCT7540

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© NXP B.V. 2012. All rights reserved.

Product data sheet

Rev. 4 — 31 December 2012

9 of 16

NXP Semiconductors

74HC7540; 74HCT7540

Octal Schmitt trigger buffer/line driver; 3-state; inverting

12. Transfer characteristics

13. Transfer characteristics waveforms

Table 10.

Transfer characteristics

At recommended operating conditions; voltages are referenced to GND (ground = 0 V); see Figure 8 and Figure 9.

Symbol Parameter

Conditions

to +85

C

to +125

C

Unit

Min

Typ

Max

Min

Max

Min

Max

74HC7540

positive-going

threshold

voltage

-

-

1.5

-

1.5

-

1.5

V

-

-

3.15

-

3.15

-

3.15

V

-

-

4.2

-

4.2

-

4.2

V

negative-going

threshold

voltage

0.3

-

-

0.3

-

0.3

-

V

1.35

-

-

1.35

-

1.35

-

V

1.8

-

-

1.8

-

1.8

-

V

hysteresis

voltage

0.1

0.20

-

0.1

-

0.1

-

V

0.25

0.40

-

0.25

-

0.25

-

V

0.3

0.5

-

0.3

-

0.3

-

V

74HCT7540

positive-going

threshold

voltage

-

-

2.0

-

2.0

-

2.0

V

-

-

2.1

-

2.1

-

2.1

V

negative-going

threshold

voltage

0.7

-

-

0.64

-

0.6

-

V

0.8

-

-

0.74

-

0.7

-

V

hysteresis

voltage

0.17

0.23

-

-

-

-

-

V

0.17

0.23

-

-

-

-

-

V

Fig 8.

Transfer characteristics

Fig 9.

Transfer characteristics definitions

mna207

mna208