TRS3221E: Could you tell me about TRS3221E's external circuit capacitance ?

user5297604

Prodigy 70 points

Part Number: TRS3221E

Hi, team.

My customer is now considering TRS3221E/2E.

The following question was received from the customer.

Can you tell me about this question?

For both ICs, the recommended value of the capacitor in the 3.3V power supply specification is 0.1uF,

but can it be used with 1.0uF?

Currently, the availability of ceramic capacitors is bad,

and my customers are having trouble obtaining capacitors of 0.1uF.

Best regards,

Masumi Sekiguchi

over 5 years ago

0 Max Robertson over 5 years ago

TI__Guru 62910 points

Hello Sekigushi-san,

Yes, the higher capacitance values can be used for C1, C2, C3, and C4. The customer may observe some change in the frequency and amplitude of ripple on the V+/V- rails, but the functionality of the device should not be impaired.

For a better understanding of the charge pump circuits used in RS-232 transceivers and the effect of different capacitance values, you can reference this blog: e2e.ti.com/.../how-the-rs-232-transceiver-s-regulated-charge-pump-circuitry-works.

Please let us know if you have any further questions.

Regards,
Max

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TRS3221E: Could you tell me about TRS3221E's external circuit capacitance ?