SN54HCT273, SN74HCT273

OCTAL DTYPE FLIPFLOPS

WITH CLEAR

SCLS068E − NOVEMBER 1988 − REVISED AUGUST 2003

3

POST OFFICE BOX 655303

−0.5 V to 7 V

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

±20 mA

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

±20 mA

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

±25 mA

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

±50 mA

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Package thermal impedance,

70

°C/W

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

DW package

58

°C/W

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

N package

69

°C/W

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

NS package

60

°C/W

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

PW package

83

°C/W

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

−65

°C to 150°C

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

† 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.

NOTES:

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

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

recommended operating conditions (see Note 3)

SN54HCT273

SN74HCT273

UNIT

MIN

NOM

MAX

MIN

NOM

MAX

UNIT

VCC

Supply voltage

4.5

5

5.5

4.5

5

5.5

V

VIH

High-level input voltage

VCC = 4.5 V to 5.5 V

2

2

V

VIL

Low-level input voltage

VCC = 4.5 V to 5.5 V

0.8

0.8

V

VI

Input voltage

0

VCC

0

VCC

V

VO

Output voltage

0

VCC

0

VCC

V

∆t/∆v

Input transition rise/fall time

500

500

ns

TA

Operating free-air temperature

−55

125

−40

85

°C

NOTE 3: 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 CMOS Inputs, literature number SCBA004.

electrical characteristics over recommended operating free-air temperature range (unless

otherwise noted)

PARAMETER

TEST CONDITIONS

VCC

TA = 25°C

SN54HCT273

SN74HCT273

UNIT

PARAMETER

TEST CONDITIONS

VCC

MIN

TYP

MAX

MIN

MAX

MIN

MAX

UNIT

VOH

VI = VIH or VIL

IOH = −20 µA

4.5 V

4.4

4.499

4.4

4.4

V

VOH

VI = VIH or VIL

IOH = −4 mA

4.5 V

3.98

4.30

3.7

3.84

V

VOL

VI = VIH or VIL

IOL = 20 µA

4.5 V

0.001

0.1

0.1

0.1

V

VOL

VI = VIH or VIL

IOL = 4 mA

4.5 V

0.17

0.26

0.4

0.33

V

II

VI = VCC or 0

5.5 V

±0.1

±100

±1000

±1000

nA

ICC

VI = VCC or 0,

IO = 0

5.5 V

8

160

80

µA

∆ICC‡

One input at 0.5 V or 2.4 V,

Other inputs at 0 or VCC

5.5 V

1.4

2.4

3

2.9

mA

Ci

4.5 V

to 5.5 V

3

10

10

10

pF

‡ This is the increase in supply current for each input that is at one of the specified TTL voltage levels, rather than 0 V or VCC.

PRODUCT PREVIEW information concerns products in the formative or

design phase of development. Characteristic data and other

specifications are design goals. Texas Instruments reserves the right to

change or discontinue these products without notice.