5

SN54AHCT240, SN74AHCT240

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SCLS252M – OCTOBER 1995 – REVISED APRIL 2016

Product Folder Links: SN54AHCT240 SN74AHCT240

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Copyright © 1995–2016, Texas Instruments Incorporated

(1)

For more information about traditional and new thermal metrics, see the IC Package Thermal Metrics application report (SPRA953).

7.4 Thermal Information

SN74AHCT240

UNIT

DW

DB

DGV

N

NS

PW

20 PINS

20 PINS

20 PINS

20 PINS

20 PINS

20 PINS

Junction-to-ambient thermal

resistance

83.0

99.9

119.2

54.9

80.4

105.4

°C/W

Junction-to-case (top) thermal

resistance

48.9

61.7

34.5

41.7

46.9

39.5

Junction-to-board thermal

resistance

50.5

55.2

60.7

35.8

47.9

56.4

Junction-to-top

characterization parameter

21.1

22.6

1.2

27.9

19.9

3.1

Junction-to-board

characterization parameter

50.1

54.8

60.0

35.7

47.5

55.8

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7.5 Electrical Characteristics

over recommended operating free-air temperature range (unless otherwise noted)

PARAMETER

TEST CONDITIONS

SN54AHCT240

–40°C to 85°C

SN74AHCT240

–40°C to 125°C

SN74AHCT240

UNIT

MIN

TYP

MAX

MIN

MAX

MIN

MAX

MIN

MAX

4.5 V

4.4

4.5

4.4

4.4

4.4

V

3.94

3.8

3.8

3.8

4.5 V

0.1

0.1

0.1

0.1

V

0.36

0.44

0.44

0.44

5.5 V

±0.25

±2.5

±2.5

±2.5

µA

0 V to

5.5 V

±0.1

±1

±1

µA

5.5 V

4

40

40

40

µA

(2)

One input at 3.4 V,

GND

5.5 V

1.35

1.5

1.5

1.5

mA

5 V

2.5

10

10

10

pF

5 V

3

pF