74LCX138 查看數據表（PDF） - STMicroelectronics

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74LCX138

Low voltage CMOS 3 to 8 line decoder (Inverter) with 5V tolerant inputs

STMicroelectronics 

Electrical characteristics

74LCX138

Table 7. AC electrical characteristics

Test condition

Value

Symbol

Parameter

VCC

CL

RL

ts = tr -40 to 85 °C Unit

(V)

(pF)

(Ω)

(ns)

Min Max

tPLH tPHL

Propagation delay

time

2.7

3.0 to 3.6

50

500

7.9

2.5

ns

1.5 6.7

Output enable

2.7

6.4

tPZL tPZH time to HIGH and

50

500

2.5

ns

LOW level

3.0 to 3.6

1.5 5.8

Output disable

2.7

7.4

tPLZ tPHZ time to HIGH and

50

500

2.5

ns

LOW level

3.0 to 3.6

1.5 6.5

tOSLH

tOSHL

Output to output

skew time (1) (2)

3.0 to 3.6

50

500

2.5

1.0 ns

1. Skew is defined as the absolute value of the difference between the actual propagation delay for any two

outputs of the same device switching in the same direction, either HIGH or LOW (tOSLH = | tPLHm - tPLHn|,

tOSHL = | tPHLm - tPHLn|)

2. Parameter guaranteed by design

Table 8. Capacitive characteristics

Test condition

Value

Symbol

Parameter

CIN Input capacitance

CPD

Power dissipation

capacitance (1)

VCC

TA = 25 °C

Unit

(V)

Min Typ Max

3.3

VIN = 0 to VCC

6

pF

3.3

fIN = 10MHz

VIN = 0 or VCC

42

pF

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

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