74AVCH4T245BQ datasheet(11/26 Pages) NXP

Part #	74AVCH4T245BQ

Description	4-bit dual supply translating transceiver with configurable voltage translation; 3-state

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Manufacturer	NXP [NXP Semiconductors]

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74AVCH4T245_1

Product data sheet

Rev. 01 — 6 August 2009

11 of 26

NXP Semiconductors

74AVCH4T245

4-bit dual supply translating transceiver; 3-state

10. Dynamic characteristics

[1]

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 = 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.

[2]

fi = 10 MHz; VI = GND to VCC; tr = tf = 1 ns; CL = 0 pF; RL = ∞Ω.

Table 9.

Typical power dissipation capacitance at VCC(A) = VCC(B) and Tamb = 25 °C [1][2]

Voltages are referenced to GND (ground=0V).

Symbol Parameter

Conditions

VCC(A) = VCC(B)

Unit

0.8 V

1.2 V

1.5 V

1.8 V

2.5 V

3.3 V

CPD

power dissipation

capacitance

A port: (direction nAn to

nBn); output enabled

0.2

0.3

0.4

pF

A port: (direction nAn to

nBn); output disabled

0.2

0.3

0.4

pF

A port: (direction nBn to

nAn); output enabled

9.5

9.7

9.8

9.9

10.7

11.9

pF

A port: (direction nBn to

nAn); output disabled

0.6

0.7

pF

B port: (direction nAn to

nBn); output enabled

9.5

9.7

9.8

9.9

10.7

11.9

pF

B port: (direction nAn to

nBn); output disabled

0.6

0.7

pF

B port: (direction nBn to

nAn); output enabled

0.2

0.3

0.4

pF

B port: (direction nBn to

nAn); output disabled

0.2

0.3

0.4

pF

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