MAX3243E: Interface forum

ttd

Mastermind 8240 points

Part Number: MAX3243E

Dear Technical Support,

I have two questions about capacitor for charge pump.

①Datasheet shows 3 situation about capacitor for charge pump.

When Vcc = 5V, which case is better , "5 V ± 0.5 V" or "3 V to 5.5 V"?

I'd like to use "3 V to 5.5 V" , because type of capacitor is less than "5 V ± 0.5 V".

② When the capacitor value is based on "3 V to 5.5 V" of ①, is Voh/Vol guaranteed ?

Note of datasheet shows only "5 V ± 0.5 V".

Best Regards,

ttd

over 6 years ago

0 Hao L over 6 years ago

TI__Mastermind 25705 points

Hi,

1) For 5V supply, both configurations are OK. "3V to 5.5V" case may generate a little higher ripples than "5 V ± 0.5 V" case. The detail is discussed in this blog.

2) It's a good observation. Minimum 5V comes from RS-232 standard, therefore MAX3243E should support it under all supply conditions.

Please let me know if you have more questions.

Regards,

Hao