74LVC3G14GT datasheet(7/18 Pages) NXP

部件名	74LVC3G14GT

功能描述	Triple inverting Schmitt trigger with 5 V tolerant input

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制造商	NXP [NXP Semiconductors]

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74LVC3G14_7

Product data sheet

Rev. 07 — 12 June 2008

7 of 18

NXP Semiconductors

74LVC3G14

Triple inverting Schmitt trigger with 5 V tolerant input

12. Dynamic characteristics

[1]

Typical values are measured at Tamb =25 °C and VCC = 1.8 V, 2.5 V, 2.7 V, 3.3 V and 5.0 V respectively.

[2]

tpd is the same as tPLH and tPHL.

[3]

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

PD =CPD × VCC2 × fi × N+ ∑(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;

∑(C

L × VCC

2

× f

o) = sum of outputs.

13. Waveforms

Table 9.

Dynamic characteristics

Voltages are referenced to GND (ground = 0 V). For test circuit see Figure 9.

Symbol Parameter

Conditions

−40 °C to +85 °C

−40 °C to +125 °C Unit

Min

Typ[1]

Max

Min

Max

tpd

propagation delay

nA to nY; see Figure 8

[2]

VCC = 1.65 V to 1.95 V

1.0

4.2

11.0

1.0

12.0

ns

VCC = 2.3 V to 2.7 V

0.5

3.0

6.5

0.5

7.2

ns

VCC = 2.7 V

0.5

3.8

7.0

0.5

7.7

ns

VCC = 3.0 V to 3.6 V

0.5

3.2

6.0

0.5

6.7

ns

VCC = 4.5 V to 5.5 V

0.5

2.4

4.3

0.5

4.7

ns

CPD

power dissipation

capacitance

VI = GND to VCC; VCC = 3.3 V

[3]

-

18.1

-

pF

Measurement points are given in Table 10. VOL and VOH are typical output voltage levels that occur with the output load.

Fig 8.

The data input (nA) to output (nY) propagation delays

mna344

tPHL

tPLH

VM

nA input

nY output

GND

VI

VOH

VOL

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