74LCX540 查看數據表（PDF） - STMicroelectronics

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74LCX540

LOW VOLTAGE CMOS OCTAL BUS BUFFER (3-STATE) WITH 5V TOLERANT INPUTS AND OUTPUTS

STMicroelectronics 

74LCX540

DYNAMIC SWITCHING CHARACTERISTICS

Test Condition

Value

Symbol

Parameter

VCC

(V)

TA = 25 °C

Unit

Min. Typ. Max.

VOLP

VOLV

Dynamic Low Level Quiet

Output (note 1)

3.3

CL = 50pF

VIL = 0V, VIH = 3.3V

0.8

-0.8

V

1) Number of outputs 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

Test Conditi on

Value

Symbol

Parameter

VCC

CL RL ts = tr -40 to 85 °C

-55 to 125 °C Unit

(V)

(pF) (Ω) (ns) Min. Max. Min. Max.

tPLH tPHL Propagation Delay

Time

2.7

3.0 to 3.6

50 500 2.5

1.5

1.5

9.0

8.0

1.5

1.5

9.0

8.0

ns

tPZL tPZH Output Enable Time

2.7

1.5

9.5

1.5

9.5

50 500 2.5

ns

3.0 to 3.6

1.5

8.5

1.5

8.5

tPLZ tPHZ Output Disable Time

2.7

1.5

8.5

1.5

8.5

50 500 2.5

ns

3.0 to 3.6

1.5

7.5

1.5

7.5

tOSLH Output To Output

3.0 to 3.6 50 500 2.5

1.0

tOSHL Skew Time (note1,

2)

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 switch-

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

2) Parameter guaranteed by design

CAPACITIVE CHARACTERISTICS

Test Condition

Value

Symbol

Parameter

VCC

(V)

TA = 25 °C

Unit

Min. Typ. Max.

CIN Input Capacitance

3.3

VIN = 0 to VCC

6

pF

COUT Output Capacitance

3.3

VIN = 0 to VCC

12

pF

CPD Power Dissipation Capacitance

3.3

(note 1)

fIN = 10MHz

VIN = 0 or VCC

25

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/8 (per buffer)

4/9

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