74LVC244A datasheet(4/9 Pages) STMICROELECTRONICS

Part #	74LVC244A

Description	LOW VOLTAGE CMOS QUAD BUS BUFFERS (3-STATE) HIGH PERFORMANCE

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74LVC244A

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DYNAMIC SWITCHING CHARACTERISTICS

1) Number of output defined as "n". Measured with "n-1" outputs switching from HIGH to LOW or LOW to HIGH. The remaining output is

measured in the LOW state.

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 x VCC x fIN + ICC/n (per circuit)

Symbol

Parameter

Test Condition

Value

Unit

VCC

(V)

TA = 25 °C

Min.

Typ.

Max.

VOLP

Dynamic Low Level Quiet

Output (note 1)

3.3

CL = 50pF

VIL = 0V, VIH = 3.3V

0.8

V

VOLV

-0.8

Symbol

Parameter

Test Condition

Value

Unit

VCC

(V)

CL

(pF)

RL

(

Ω)

ts = tr

(ns)

-40 to 85 °C

-55 to 125 °C

Min.

Max.

Min.

Max.

tPLH tPHL

Propagation Delay

Time

1.65 to 1.95

30

1000

2.0

9.0

12

ns

2.3 to 2.7

30

500

2.0

7.9

10.5

2.7

50

500

2.5

1.5

6.9

8.3

3.0 to 3.6

50

500

2.5

1

5.9

7.1

tPZL tPZH

Output Enable Time

1.65 to 1.95

30

1000

2.0

11

14.3

ns

2.3 to 2.7

30

500

2.0

9.6

12.5

2.7

50

500

2.5

1

8.6

10.3

3.0 to 3.6

50

500

2.5

1

7.6

9.1

tPLZ tPHZ

Output Disable Time 1.65 to 1.95

30

1000

2.0

9.0

11.7

ns

2.3 to 2.7

30

500

2.0

7.8

10.1

2.7

50

500

2.5

2

6.8

8.2

3.0 to 3.6

50

500

2.5

2

6.5

7.8

tOSLH

tOSHL

Output To Output

Skew Time (note1,

2)

2.7 to 3.6

1

ns

Symbol

Parameter

Test Condition

Value

Unit

VCC

(V)

TA = 25 °C

Min.

Typ.

Max.

CIN

Input Capacitance

4pF

CPD

Power Dissipation Capacitance

(note 1)

1.8

fIN = 10MHz

28

pF

2.5

30

3.3

34

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