74LCX157MTR(2007) 데이터 시트보기 (PDF) - STMicroelectronics

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74LCX157MTR
(Rev.:2007)

Low voltage CMOS Quad 2 channel multiplexer with 5V tolerant inputs

STMicroelectronics 

Electrical characteristics

74LCX157

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 A, B to Y

2.7

3.0 to 3.6

50

500

6.5

2.5

ns

1.5 6.0

tPLH tPHL

Propagation delay

time SELECT to Y

2.7

3.0 to 3.6

50

500

8.0

2.5

ns

1.5 7.0

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

Symbol

Parameter

VCC

(V)

CIN Input capacitance

Power dissipation

CPD capacitance (1)

3.3

VIN = 0 to VCC

3.3

fIN = 10MHz

VIN = 0 or VCC

Value

TA = 25 °C

Unit

Min Typ Max

6

pF

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/4

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