5

SN54LS240, SN54LS241, SN54LS244, SN54S240, SN54S241, SN54S244

SN74LS240, SN74LS241, SN74LS244, SN74S240, SN74S241, SN74S244

www.ti.com

SDLS144D – APRIL 1985 – REVISED OCTOBER 2016

Product Folder Links: SN54LS240 SN54LS241 SN54LS244 SN54S240 SN54S241 SN54S244 SN74LS240

SN74LS241 SN74LS244 SN74S240 SN74S241 SN74S244

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Copyright © 1985–2016, Texas Instruments Incorporated

(1)

For more information about traditional and new thermal metrics, see the Semiconductor and IC Package Thermal Metrics application

report.

(2)

Voltage values are with respect to network ground terminal.

(3)

The package thermal impedance is calculated in accordance with JESD 51-7.

6.4 Thermal Information

THERMAL METRIC(1)

SN74LS240,

SN74LS244

SN74LS24x, SN74S24x

SN74LS24x

UNIT

DB (SSOP)

DW (SOIC)

N (PDIP)

NS (SOP)

20 PINS

20 PINS

20 PINS

20 PINS

RθJA

Junction-to-ambient thermal resistance(2)(3)

94.3

90.3

50.6

76.6

°C/W

RθJC(top)

Junction-to-case (top) thermal resistance

55.9

45.5

37.4

42.9

°C/W

RθJB

Junction-to-board thermal resistance

49.5

48.1

31.5

44.1

°C/W

ψJT

Junction-to-top characterization parameter

21.3

19.4

24

19.2

°C/W

ψJB

Junction-to-board characterization parameter

49.1

47.6

31.4

43.7

°C/W

(1)

For conditions shown as minimum or maximum, use the appropriate value specified under recommended operating conditions.

(2)

All typical values are at VCC = 5 V and TA = 25°C.

(3)

Not more than one output must be shorted at a time, and duration of the short-circuit must not exceed one second.

6.5 Electrical Characteristics – SNx4LS24x

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

PARAMETER

TEST CONDITIONS(1)

MIN

TYP(2)

MAX

UNIT

VIK

VCC = MIN, II = –18 mA

–1.5

V

Hysteresis

(VT+ − VT−)

VCC = MIN

0.2

0.4

V

VOH

VCC = MIN, IOH = –3 mA, VIH = 2 V, VIL = MAX

2.4

3.4

V

VCC = MIN, IOH = MAX, VIH = 2 V, VIL = 0.5 V

2

VOL

VCC = MIN, VIL = MAX, VIH = 2 V

IOL = 12 mA, SN54LS24x

0.4

V

IOL = 24 mA, SN74LS24x

0.5

IOZH

VCC = MAX, VIL = MAX, VIH = 2 V, VO = 2.7 V

20

µA

IOZL

VCC = MAX, VIL = MAX, VIH = 2 V, VO = 0.4 V

–20

µA

II

VCC = MAX, VI = 7 V

0.1

mA

IIH

VCC = MAX, VI = 2.7 V

20

µA

IIL

VCC = MAX, VIL = 0.4 V

–0.2

mA

IOS

(3)

VCC = MAX

–40

–225

mA

ICC

VCC = MAX, output open

Outputs high

All

17

27

mA

Outputs low

SNx4LS240

26

44

SNx4LS241, SNx4LS244

27

46

Outputs disabled

SNx4LS240

29

50

SNx4LS241, SNx4LS244

32

54

(1)

For conditions shown as minimum or maximum, use the appropriate value specified under recommended operating conditions.

(2)

All typical values are at VCC = 5 V, TA = 25°C.

6.6 Electrical Characteristics – SNx4S24x

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

PARAMETER

TEST CONDITIONS(1)

MIN

TYP(2)

MAX

UNIT

VIK

VCC = MIN, II = –18 mA

–1.2

V

Hysteresis

(VT+ − VT−)

VCC = MIN

0.2

0.4

V

VOH

VCC = MIN, IOH = –1 mA, VIH = 2 V, VIL = 0.8 V, SN74S24x only

2.7

V

VCC = MIN, IOH = –3 mA, VIH = 2 V, VIL = 0.8 V

2.4

3.4

VCC = MIN, IOH = MAX, VIH = 2 V, VIL = 0.5 V

2

VOL

VCC = MIN, VIL = MAX, VIH = 2 V, IOL = 0.8 V

0.55

V