TPS3890-Q1: High accuracy Reset delay

Ryuji

Guru 20090 points

Part Number: TPS3890-Q1
Other Parts Discussed in Thread: TPS3890

Hello,

I'm looking for a reset IC that can realize a delay time of 80 ms +/- 10 ms.
From the equation of TPS3890-Q1, we couldn't achieve 80ms +/- 10ms delay time.
Please see the attached file as my calculation based on Vdd=3.3V.
Is this calculation correct ?
Also, if there is other device which can be achieve this requirement, please let me know.
Reset Threshold is 3.3V+/-0.2V.

TPS3890-Q1_Calculation.xlsx

Best Regards,
Ryuji

over 8 years ago

0 Michael_DeSando over 8 years ago

TI__Genius 12630 points

Ryuji,

TPS3890 is our most accurate device from our programmable delay section. Your calculation looks correct. To reduce the delay tolerance, we recommend using a 5% tolerance or better capacitor. If the capacitor tolerance is eliminated, the delay accuracy is closer to +/- 30%. This is still not as good as your desired +/- 12.5% unfortunately.

-Michael

0 Ryuji over 8 years ago in reply to Michael_DeSando

Guru 20090 points

Hello Michael san,

Thank you I understood.

Best Regards,
Ryuji

Power management

Power management forum

TPS3890-Q1: High accuracy Reset delay