74HCT7540D 查看數據表（PDF） - Philips Electronics

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74HCT7540D

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

Philips Electronics 

Philips Semiconductors

Octal Schmitt trigger buffer/line driver;

3-state; inverting

Product specification

74HC/HCT7540

DC CHARACTERISTICS FOR 74HC

For the DC characteristics see “74HC/HCT/HCU/HCMOS Logic Family Specifications”.

Transfer characteristics are given below (not applicable for OEn inputs).

Output capability: bus driver

ICC category: MSI

AC CHARACTERISTICS FOR 74HC

GND = 0 V; tr = tf = 6 ns; CL = 50 pF

Tamb (°C)

SYMBOL PARAMETER

74HC

UNIT

+25

−40 to +85 −40 to +125

min. typ. max. min. max. min. max.

tPHL/ tPLH propagation delay

An to Yn

tPZH/ tPZL

tPHZ/ tPLZ

tTHL/ tTLH

3-state output enable

time

OEn to Yn

3-state output disable

time

OEn to Yn

output transition time

39 120

150

14 24

30

11 20

26

41 150

190

15 30

38

12 26

33

52 150

190

19 30

38

15 26

33

14 60

75

5 12

15

4 10

13

180 ns

36

31

225 ns

45

38

225 ns

45

38

90 ns

18

15

TEST CONDITIONS

VCC

(V)

WAVEFORMS

2.0 Fig.8

4.5

6.0

2.0 Fig.9

4.5

6.0

2.0 Fig.9

4.5

6.0

2.0 Fig.8

4.5

6.0

TRANSFER CHARACTERISTICS FOR 74HC

Voltages are referred to GND (ground = 0 V)

Tamb (°C)

TEST CONDITIONS

SYMBOL PARAMETER

+25

min. typ. max.

74HC

−40 to +85

min. max.

−40 to +125

min. max.

UNIT

VCC

(V)

WAVEFORMS

VT+

positive-going threshold

1.50

1.50

3.15

3.15

4.20

4.20

1.50 V

3.15

4.20

2.0 Figs 6 and 7

4.5

6.0

VT−

negative-going threshold 0.30

1.35

1.80

0.30

0.30

1.35

1.35

1.80

1.80

V 2.0 Figs 6 and 7

4.5

6.0

VH

hysteresis (VT+ − VT−) 0.10 0.20

0.25 0.40

0.30 0.50

0.10

0.25

0.30

0.10

0.25

0.30

V 2.0 Figs 6 and 7

4.5

6.0

December 1990

5

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