5.6 Switching Characteristics

Input tr, tf = 6 ns (See Parameter Measurement Information)

PARAMETER

TEST

CONDITIONS

VCC(V)

25

℃

–40

℃ to 85℃ –55℃ to 125℃

UNIT

TYP

MAX

MAX

MAX

HC TYPES

tPLH, tPHL

Propagation delay

Clock to output

CL = 50 pF

2

150

190

225

ns

4.5

30

38

45

6

26

30

38

CL = 15 pF

5

12

tPHL

Propagation delay

CLR to output

CL = 50 pF

2

150

190

225

ns

4.5

30

38

45

6

26

30

38

tTLH, tTHL Output transition time

CL = 50 pF

2

75

95

110

ns

4.5

15

19

22

6

13

16

19

CIN

Input capacitance

10

10

10

pF

fMAX

Maximum clock frequency

CL = 15 pF

5

60

MHz

CPD

Power dissipation capacitance(1) (2)

5

25

pF

HCT TYPES

tPLH, tPHL

Propagation delay,

Clock to output

CL = 50 pF

4.5

30

38

45

ns

CL = 15 pF

5

12

tPHL

Propagation delay,

CLR to output

CL = 50 pF

4.5

32

40

48

ns

tTLH, tTHL Output transition time

CL = 50 pF

4.5

15

19

22

ns

CIN

Input capacitance

10

10

10

pF

fMAX

Maximum clock frequency

CL = 15 pF

5

50

MHz

CPD

Power dissipation capacitance(1) (2)

5

25

pF

(1)

CPD is used to determine the dynamic power consumption, per flip-flop.

(2)

PD = CPD VCC 2 fi + Σ (CL VCC 2 + fO) where fi = input frequency, fO = output frequency, CL = output load capacitance, VCC = supply

voltage.

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CD54HC273, CD74HC273

CD54HCT273, CD74HCT273

SCHS174C – FEBRUARY 1998 – REVISED JANUARY 2022

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