5.3 Recommended Operating Conditions (continued)

see(1)

MIN

MAX

UNIT

TA

Operating free-air temperature

SN54LVC74A

–55

125

°C

SN74LVC74A

–40

125

(1)

All unused inputs of the device must be held at VCC or GND to ensure proper device operation. See the TI application report,

Implications of Slow or Floating CMOS Inputs (SCBA004).

5.4 Thermal Information: SN74LVC74A

THERMAL METRIC(1)

SN74LVC74A

UNIT

BQA

(WQFN)

D

(SOIC)

DB

(SSOP)

NS

(SO)

PW

(TSSOP)

RGY

(VQFN)

14 PINS

14 PINS

14 PINS

14 PINS

14 PINS

14 PINS

RθJA

Junction-to-ambient thermal resistance

102.3

127.8

140.4

123.8

150.8

92.1

°C/W

RθJC(top)

Junction-to-case (top) thermal resistance

96.8

54.8

59.2

48.1

50.3

52.2

°C/W

RθJB

Junction-to-board thermal resistance

70.9

48

54.6

49.1

63.4

30.8

°C/W

ψJT

Junction-to-top characterization parameter

16.6

20.3

24.1

17.9

6.2

2.4

°C/W

ψJB

Junction-to-board characterization

parameter

70.9

47.7

54.1

48.8

62.8

30.9

°C/W

RθJC(bot)

Junction-to-case (bottom) thermal

resistance

50.1

—

—

—

—

12.5

°C/W

(1)

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

report.

5.5 Electrical Characteristics

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

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

VOH

High-level output voltage

IOH = –100 µA

VCC = 1.65 V to 3.6 V and TA = –55°C

to 125°C (SN54LVC74A only)

VCC – 0.2

V

VCC = 2.7 V to 3.6 V and TA = –40°C to

125°C (SN74LVC74A only)

VCC – 0.2

IOH = –4 mA, VCC = 1.65 V, and TA = –40°C to 125°C

(SN74LVC74A only)

1.2

IOH = –8 mA, VCC = 2.3 V, and TA = –40°C to 125°C

(SN74LVC74A only)

1.7

IOH = –12 mA

VCC = 2.7 V

2.2

VCC = 3 V

2.4

IOH = –24 mA, VCC = 3 V

2.2

VOL

Low-level output voltage

IOL = 100 µA

VCC = 1.65 V to 3.6 V, and TA = –40°C

to 125°C (SN74LVC74A only)

0.2

V

VCC = 2.7 V to 3.6 V and TA = –55°C to

125°C (SN54LVC74A only)

0.2

IOL = 4 mA, VCC = 1.65 V, and TA = –40°C to 125°C

(SN74LVC74A only)

0.45

IOL = 8 mA, VCC = 2.3 V, and TA = –40°C to 125°C

(SN74LVC74A only)

0.7

IOL = 12 mA, VCC = 2.7 V

0.4

IOL = 24 mA, VCC = 3 V

0.55

II

Input current

VI = 5.5 V or GND, VCC = 3.6 V

±5

µA

ICC

Supply current

VI = VCC or GND, IO = 0, VCC = 3.6 V

10

µA

ΔICC

Change in supply current

One input at VCC – 0.6 V, other inputs at VCC or GND, and

VCC = 2.7 V to 3.6 V

500

µA

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SCAS287W – JANUARY 1993 – REVISED DECEMBER 2024

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