74LCX74 datasheet(5/11 Pages) STMICROELECTRONICS

5 / 11 page

74LCX74

5/11

AC ELECTRICAL CHARACTERISTICS

1) Skew is defined as the absolute value of the difference between the actual propagation delay for any two outputs of the same device switch-

ing in the same direction, either HIGH or LOW (tOSLH =| tPLHm -tPLHn|, tOSHL =| tPHLm -tPHLn|)

2) Parameter guaranteed by design

CAPACITIVE CHARACTERISTICS

1) CPD is defined as the value of the IC’s internal equivalent capacitance which is calculated from the operating current consumption without

load. (Refer to Test Circuit). Average operating current can be obtained by the following equation. ICC(opr) =CPD xVCC xfIN +ICC/2 (per

Fli p-Flop)

Symbol

Parameter

Test Conditi on

Value

Unit

VCC

(V)

(pF)

(

Ω)

ts = tr

(ns)

-40 to 85

°C

-55 to 125

°C

Min.

Max.

Min.

Max.

tPLH tPHL

Propagation Delay

Time (CK to Q or Q)

2.7

500

2.5

1.5

8.0

1.5

9.2

3.0 to 3.6

1.5

7.0

1.5

8.0

tPLH tPHL

Propagation Delay

Time (PR or CLR to

Qor Q)

2.7

500

2.5

1.5

8.0

1.5

9.2

3.0 to 3.6

1.5

7.0

1.5

8.0

Setup Time, HIGH or

LOW level D to CK

2.7

500

2.5

3.5

3.0 to 3.6

2.5

3.5

Hold Time, HIGH or

LOW level D to CK

2.7

500

2.5

1.5

3.0 to 3.6

1.5

CK Pulse Width,

HIGH or LOW

PR or CLR Pulse

Width, LOW

2.7

500

2.5

3.0

4.0

3.0 to 3.6

3.0

4.0

trec

Recovery Time PR

or CLR to CK

2.7

500

2.5

3.0 to 3.6

fMAX

Clock Pulse

Frequency

2.7

500

2.5

150

MHz

tOSLH

tOSHL

Output To Output

Skew Time (note1,

3.0 to 3.6

500

2.5

1.0

Symbol

Parameter

Test Condition

Value

Unit

VCC

(V)

TA =25 °C

Min.

Typ.

Max.

CIN

Input Capacitance

3.3

VIN = 0 to VCC

6pF

CPD

Power Dissipation Capacitance

(note 1)

3.3

fIN = 10MHz

VIN = 0 or VCC

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