74HC2G14GV datasheet(7/19 Pages) NXP

Il numero della parte	74HC2G14GV

Spiegazioni elettronici	Dual inverting Schmitt trigger

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74HC_HCT2G14_1

Product data sheet

Rev. 01 — 11 October 2006

7 of 19

NXP Semiconductors

74HC2G14; 74HCT2G14

Dual inverting Schmitt trigger

12. Dynamic characteristics

[1]

tpd is the same as tPLH and tPHL

[2]

tt is the same as tTLH and tTHL

[3]

CPD is used to determine the dynamic power dissipation (PD in µW).

PD =CPD × VCC2 × fi × N+ Σ(CL × VCC2 × fo) where:

fi = input frequency in MHz;

fo = output frequency in MHz;

CL = output load capacitance in pF;

VCC = supply voltage in V;

N = number of inputs switching;

Σ(C

L × VCC

2

× f

o) = sum of the outputs.

Table 9.

Dynamic characteristics

Voltages are referenced to GND (ground = 0 V); for test circuit see Figure 6.

Symbol

Parameter

Conditions

25

°C

−40 °C to +125 °C

Unit

Min

Typ

Max

Min

Max

(85

°C)

Max

(125

°C)

74HC2G14

tpd

propagation delay

nA to nY; see Figure 5

[1]

VCC = 2.0 V; CL = 50 pF

-

53

125

-

155

190

ns

VCC = 4.5 V; CL = 50 pF

-

16

25

-

31

38

ns

VCC = 6.0 V; CL = 50 pF

-

13

21

-

26

32

ns

tt

transition time

nY; see Figure 5

[2]

VCC = 2.0 V; CL = 50 pF

-

20

75

-

95

110

ns

VCC = 4.5 V; CL = 50 pF

-

7

15

-

19

22

ns

VCC = 6.0 V; CL = 50 pF

-

5

13

-

16

19

ns

CPD

power dissipation

capacitance

VI = GND to VCC

[3]

-10-

-

pF

74HCT2G14

tpd

propagation delay

nA to nY; see Figure 5

[1]

VCC = 4.5 V; CL = 50 pF

-

21

32

-

40

48

ns

tt

transition time

nY; see Figure 5

[2]

VCC = 4.5 V; CL = 50 pF

-

6

15

-

19

22

ns

CPD

power dissipation

capacitance

VI = GND to VCC − 1.5 V

[3]

-10-

-

pF

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