Other Parts Discussed in Thread: SN74LVC1G14, SN74LVC1G97
Hi,
Customer of mine would like to use NAND gate (SN74LVC1G00DBVR) to do the switching of the 3.7V battery power and 5V USB power rail. As below
Please advise if it's feasible?
Thanks!
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Hi,
Customer of mine would like to use NAND gate (SN74LVC1G00DBVR) to do the switching of the 3.7V battery power and 5V USB power rail. As below
Please advise if it's feasible?
Thanks!
Normal LVC inputs have a limit on the length of signal edges; if the USB_VBUS voltage can change slowly, it could lead to problems. (See [FAQ] How does a slow or floating input affect a CMOS device?)
These NAND gates are actually used as inverters, so I'd recommend an inverter with Schmitt-trigger input, i.e., SN74LVC1G14.
If the NAND gates are used to reduce BOM count, then I'd recommend a configurable logic gate with Schmitt-trigger inputs, e.g., SN74LVC1G97.