SN74CBT16210C: Datasheet clarification

Marvn Arcangel

Part Number: SN74CBT16210C

Hi Experts,

Would you kindly help clarify this inquiry?

Page 3 of the datasheet mentioned the absolute ON state switch current is 128mA. However, note 4 mentioned this value is under specific conditions. Can you elaborate more about this "specific condition"?

The customer needs 5V 600mA peak current (100mA average current) to go through this switch, and plans to use 5 ports of this switch to achieve this goal. Hopefully, using 5 ports of the switch can also minimize the effective ON resistance. This 5V 600mA peak current actually is the 5V VDD of the next-level PCB. This next-level PCB uses TI's TLV1117LV33, which has dropout voltage 455mA. That is the next-level PCB can allow the VDD to be in the range of 3.8-5V.

Thanks in advance.

Regards,

Marvin

over 2 years ago

0 Rami Mooti1 over 2 years ago

TI__Mastermind 29648 points

Hey Marvin,

So I believe this is just super confusing wording and is meant to note that I_Iand I_O are 'sub-categories' of I_I/O but I see how it sounds like they're specifying certain conditions here. That's to say, the spec sort of lumps the input and output together as I_I/Obut the note is trying to say that I_Iand I_O are both specific conditions of where I_Imeans current at input while I_O means current at output.

On the second part here, you can certainly put your inputs in parallel to reduce the current and split it across channels. My concern with using this device though will come from the fact that it's an NMOS switch so you wouldn't necessarily be able to use it effectively as a rail-to-rail device. Please see this E2E that came in today that I believe may be about the same project (I'd recommend a CBTLV or a TMUX device here instead if this is the route you want to take)

(+) SN74CBT16210C: ON resistance when Vin=3.3V or Vin=5V when VCC=5V & usage of multiple ports in parallel - Switches & multiplexers forum - Switches & multiplexers - TI E2E support forums

Hope this helps!
Rami