SN74LVC8T245-EP: Clarity on power dissipation

ISHANK VARSHNEY

Part Number: SN74LVC8T245-EP

Hi,

i am looking for the power dissipation of the device SN74LVC8T245-EP, when VccA = 3.3V and VccB = 5V. Similarly for the SN54LVT162245A device.

Thanks

Ishank Varshney

over 5 years ago

0 ISHANK VARSHNEY over 5 years ago

Prodigy 90 points

The power dissipation of SN74LVC8T245-EP is not mentioned in the datasheet.

0 Wade Vonbergen over 5 years ago in reply to ISHANK VARSHNEY

TI__Guru 62930 points

Power dissipation is calculated using the CpdA and CpdB parameters.
Use both parameters at each condition and sum them.
See this app note for generic information on Cpd calculations
www.ti.com/.../scaa035

If this answers your question, please click "Verify it as the answer"
Regards,
Wade

0 ISHANK VARSHNEY over 5 years ago in reply to Wade Vonbergen

Prodigy 90 points

I have calculated the power dissipation by using the formula P=((VccA*IcA)+(VccB*IcB)) which is 3.3V*50nA + 5V*50nA comes out be 0.415mW. Is this correct? please let me know the power dissipation of this device in figure with complete explanation. thanks

0 Wade Vonbergen over 5 years ago in reply to ISHANK VARSHNEY

TI__Guru 62930 points

Please read the application note.
You need to include the dynamic power. This is also per pin.
This is explained starting on page 7.
Regards,
Wade

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SN74LVC8T245-EP: Clarity on power dissipation