SNVSB03D December 2018 – January 2020 TPS3840
This design requires voltage supervision on two separate rails: 3.3-V and 1.8-V rails. The voltage rail needs to sequence upon power up with the 3.3-V rail coming up first followed by the 1.8-V rail at least 25 ms after.
|PARAMETER||DESIGN REQUIREMENT||DESIGN RESULT|
|Two Rail Voltage Supervision||Monitor 3.3-V and 1.8-V rails||Two TPS3840 devices provide voltage monitoring with 1% accuracy with device options available in 0.1 V variations|
|Voltage Rail Sequencing||Power up the 3.3-V rail first followed by 1.8-V rail 25 ms after||The CT capacitor on TPS38240PL28 is set to 0.047 µF for a reset time delay of 29 ms typical|
|Output logic voltage||3.3-V Open-Drain||3.3-V Open-Drain|
|Maximum device current consumption||1 µA||Each TPS3840 requires 350 nA typical|