CD54AC00: Input impedance of the gate and Tolerance

Lang Trinh

Part Number: CD54AC00
Other Parts Discussed in Thread: SN54AC00-SP, SN54AC00

The part is Rad-Hard AC00 with SMD 5962R8754903V9A.

What is the input impedance of the gate and any tolerance, drift due lot variation, temperature, radiation and end-of-life?

Thanks!

over 6 years ago

0 Wade Vonbergen over 6 years ago

TI__Guru 62930 points

Lang,
We do not define the input impedance as a specification.
However, we do test the input leakage. This leakage is tested pre and post irradiation (during qual).
This leakage is also tested pre and post life test (during qual).
In order to pass the TID testing, and life test, the device must perform within specified datasheet limits.
Post testing is performed at 25c.

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

0 Lang Trinh over 6 years ago in reply to Wade Vonbergen

Prodigy 60 points

Hi Wade,
What is this input leakage current (symbol name) and the specified datasheet limits? I don't see it with the datasheet I have.
Could you share this typical leakage current at pre and post irradiation and life tests, and how it was set up for tests? I'm thinking to use this data to calculate input DC resistances, based on applied voltage and current.

Thanks,
Lang

0 Wade Vonbergen over 6 years ago in reply to Lang Trinh

TI__Guru 62930 points

Lang,
The symbol in this datasheet is Ii. It is specified as +/- 1uA.

Also, a note of clarification. You indicated the device type as CD54AC00. The SMD DLA device is the SN54AC00-SP.
Only the SN54AC00-SP has the radiation hardening.

The radiation report shows trends for various parameters across exposure.
Note, that the link is incorrect from the product folder.
Until it is fixed, this is correct link for the 100Krad report.
www.ti.com/.../AC00_50kRadiationReport.pdf

Regards,
Wade

0 Lang Trinh over 6 years ago in reply to Wade Vonbergen

Prodigy 60 points

Thanks for the clarification and the data! The report says "50kRadiationReport". Should it be 100krad?

Lang

0 Wade Vonbergen over 6 years ago in reply to Lang Trinh

TI__Guru 62930 points

You are correct. This report is for 50krad.
Regards,
Wade

0 Lang Trinh over 6 years ago in reply to Wade Vonbergen

Prodigy 60 points

Do you have Input Capacitance of the logic gate over temperature and supply voltages?

Thanks,

Lang

0 Wade Vonbergen over 6 years ago in reply to Lang Trinh

TI__Guru 62930 points

Lang,

I am assuming you are referring to the SN54AC00 vs the CD54AC00.

I was able to locate our characterization data for terminal capacitance. We do not measure across temp or voltage, but only nominal conditions.

Testing for terminal capacitance is not an exact science, as setup with respect to ground can change results. The testing typically takes the probe tips from input pin to a ground pin. This would achieve different results if going from input pin to a ground plane mounted on a board.

Capacitance values range from 6.3pF to 9.8pF measured at 5V.

Regards,

Wade

0 Lang Trinh over 6 years ago in reply to Wade Vonbergen

Prodigy 60 points

Wade,
It looks like Input Capacitance varies with frequency too. What frequency was it measured at?

Thanks,
Lang

0 Wade Vonbergen over 6 years ago in reply to Lang Trinh

TI__Guru 62930 points

The LCR meter is set to 1Mhz.
Regards,
Wade

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CD54AC00: Input impedance of the gate and Tolerance