74LCX541 datasheet(8/17 Pages) STMICROELECTRONICS

tên linh kiện	74LCX541

Giải thích chi tiết về linh kiện	LOW VOLTAGE CMOS OCTAL BUS BUFFER (3-STATE) WITH 5V TOLERANT INPUTS AND OUTPUTS

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Electrical characteristics

74LCX541

8/17

Table 7. AC electrical characteristics

Symbol

Parameter

Test condition

Value

Unit

VCC

(V)

(pF)

(

Ω)

ts = tr

(ns)

-40 to 85 °C

Min

Max

tPLH tPHL Propagation delay

time

2.7

500

2.5

1.5

9.0

3.0 to 3.6

1.5

8.0

tPZL tPZH Output enable

time

2.7

500

2.5

1.5

9.5

3.0 to 3.6

1.5

8.5

tPLZ tPHZ Output disable

time

2.7

500

2.5

1.5

8.5

3.0 to 3.6

1.5

7.5

tOSLH

tOSHL

output to output

skew time (1) (2)

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|)

Parameter guaranteed by design

3.0 to 3.6

500

2.5

1.0

Table 8. Capacitive characteristics

Symbol

Parameter

Test condition

Value

Unit

VCC

(V)

TA = 25 °C

Min

Typ

Max

CIN

Input capacitance

3.3

VIN = 0 to VCC

6pF

COUT

Output capacitance

3.3

VIN = 0 to VCC

CPD

Power dissipation

capacitance (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/8 (per buffer)

3.3

fIN = 10MHz

VIN = 0 or VCC

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