74LCX138 datasheet(5/12 Pages) STMICROELECTRONICS

5 / 12 page

74LCX138

5/12

Table 8: 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

Table 9: 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

Figure 4: Test Circuit

CL = 50pF or equivalent (includes jig and probe capacitance)

RL = 500Ω or equivalent

RT = ZOUT of pulse generator (typically 50Ω)

Symbol

Parameter

Test Condition

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 A, B, C to Y

2.7

500

2.5

7.9

3.0 to 3.6

1.5

6.7

1.5

6.7

tPLH tPHL

Propagation Delay

Time G1 to Y

2.7

500

2.5

6.4

3.0 to 3.6

1.5

5.8

1.5

5.8

tPLH tPHL

Propagation Delay

Time G2 to Y

2.7

500

2.5

7.4

3.0 to 3.6

1.5

6.5

1.5

6.5

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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