4

Output Transition Time

tTLH, tTHL

CL = 50pF

2

-

75

95

110

ns

4.5

-

15

19

22

ns

6

-

13

16

19

ns

Input Capacitance

CI

--

-

10

10

10

pF

Power Dissipation

Capacitance

(Notes 3, 4)

CPD

-

5

58

-

-

-

pF

HCT TYPES

Propagation Delay,

Any Input to

ΣO

tPLH, tPHL

CL = 50pF

4.5

-

45

56

68

ns

CL = 15pF

5

19

-

-

-

ns

Propagation Delay,

Any Input to

ΣE

tPLH, tPHL

CL = 50pF

4.5

-

42

53

63

ns

CL = 15pF

5

18

-

-

-

ns

Output Transition Time

tTLH, tTHL

CL = 50pF

4.5

-

15

19

22

ns

Input Capacitance

CIN

--

-

10

10

10

pF

Power Dissipation

Capacitance

(Notes 3, 4)

CPD

-

5

58

-

-

-

pF

NOTES:

3. CPD is used to determine the dynamic power consumption, per package.

4. PD = VCC

2 f

i (CPD + CL) where fi = Input Frequency, fO = Output Frequency, CL = Output Load Capacitance, VCC = Supply Voltage.

Switching Specifications Input tr, tf = 6ns (Continued)

PARAMETER

SYMBOL

TEST

CONDITIONS

VCC (V)

25oC

-40oC TO 85oC

-55oC TO

125oC

UNITS

TYP

MAX

MAX

MAX

Test Circuits and Waveforms

FIGURE 1. HC TRANSITION TIMES AND PROPAGATION

DELAY TIMES, COMBINATION LOGIC

FIGURE 2. HCT TRANSITION TIMES AND PROPAGATION

DELAY TIMES, COMBINATION LOGIC

tPHL

tPLH

tTHL

tTLH

90%

50%

10%

50%

10%

INVERTING

OUTPUT

INPUT

GND

VCC

tr = 6ns

tf = 6ns

90%

tPHL

tPLH

tTHL

tTLH

2.7V

1.3V

0.3V

1.3V

10%

INVERTING

OUTPUT

INPUT

GND

3V

tr = 6ns

tf = 6ns

90%

CD54HC280, CD74HC280, CD54HCT280, CD74HCT280