Other Parts Discussed in Thread: TLV7031, TL7705A
I would like to use a comparator to cut the power supply of a section of my circuit.
This comparator must work with the lowest voltage supply possible.
I found 2 suitable chips:
- TLV3691 (down to Vdd_min=0.9V)
- TLV7031 (down to Vdd_min=1.6V)
It is very important for me that the chip will keep the output low, even when the Vdd is lower than Vdd_min.
In chapter 7.4 of both datasheet we have the “Device functional modes”
For TLV7031 we have:
“The TLV703x and TLV704x have a power-on-reset (POR) circuit.
While the power supply (VS) is less than the minimum supply voltage, either upon ramp-up or ramp-down, the POR circuitry is activated.
For the TLV703x, the POR circuit holds the output low (at VEE) while activated”
Is this confirming what I need? In case it is not, How low can the POR work, in terms of voltage?
For the TLV3691 we have:
“The TLV3691 has a single functional mode and is operational when the power supply voltage is greater than 0.9 V.”
What this mean exactly? What happen at the output when Vdd is less that 0.9V?
Thanks for your clarification.