5 Specifications

5.1 Absolute Maximum Ratings

over operating free-air temperature range (unless otherwise noted)(1)

MIN

MAX

UNIT

VCC

Supply voltage range

-0.5

7

V

IIK

Input diode current

(2)

VI < 0.5 V or VI > VCC + 0.5 V

±20

mA

IOK

Output diode current

(2)

VO < – 0.5 V or VO > VCC + 0.5 V

±20

mA

IO

Drain current, per output

– 0.5 V < VO < VCC + 0.5 V

±25

mA

IO

Output source or sing current per

output pin

VO > – 0.5 V or VO < VCC + 0.5 V

±25

mA

Continuous current through VCC or GND

±50

mA

TJ

Junction temperature

150

°C

Tstg

Storage temperature

-65

150

°C

Lead temperature (Soldering 10s) (SOIC - lead tips only)

300

°C

(1)

Stresses beyond those listed under absolute maximum ratings may cause permanent damage to the device. These are stress ratings

only and functional operation of the device at these or any other conditions beyond those indicated under recommended operating

conditions is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.

(2)

The input and output voltage ratings may be exceeded if the input and output current ratings are observed.

5.2 Recommended Operating Conditions

(1)

MIN

MAX

UNIT

VCC

Supply voltage range

HC Types

2

6

V

HCT Types

4.5

5.5

V

VI, VO

DC input or output voltage

0

VCC

V

tt

Input rise and fall time

2 V

1000

ns

4.5 V

500

6 V

400

TA

Temperature range

– 55

125

℃

(1)

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

Implications of Slow or Floating SMOS Inputs, literature number SCBA004.

5.3 Thermal Information

THERMAL METRIC

D (SOIC)

N (PDIP)

UNIT

16 PINS

16 PINS

RθJA

Junction-to-ambient thermal resistance(1)

67

73

°C/W

(1)

For more information about traditional and new thermal metrics, see the Semiconductor and IC package thermal metrics application

report.

CD54HC251, CD74HC251, CD54HCT251, CD74HCT251

SCHS169D – NOVEMBER 1998 – REVISED MARCH 2022

www.ti.com

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