This thread has been locked.
If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.
Part Number: SN74CBTLV3251
Hello TI Support,Can you please explain main difference between SN74CB3Q3251 ($0.17) and SN74CBTLV3251 ($0.25)
If I understand correctly, both devices support partial power off (Ioff) and as per datasheets
SN74CB3Q3251 Ioff = 1uASN74CBTLV3251 Ioff = 20uASN74CB3Q3251 can switch input signal levels beyond supply rail, i.e. 0 to 5V @ Vcc = 3.3VSN74CBTLV3251 switches 0 < VIN < Vcc
Both are footprint compatible and the SN74CB3Q3251 is also cheaper... Any reason why SN74CBTLV3251 over SN74CB3Q3251?Do you have any information on cross-talk performance?Also, I don't see any leakage information - can you please recommend Opamp to interface with SN74CB3Q3251? TMUX1108 is promising for low power / precision application but @ ~10x the cost of SN74CB3Q3251 I am unable to justify itCan you please confirm if TMUX1108 support partial power off as well?
So the difference between the two parts is actually is architecture. The CBTLV is using a transmission gate architecture while the CB3Q uses an NFET and a charge pump based switch. This means that the CB3Q will have a higher power supply current which could affect efficiency for the system.
The reason you would pick the CBTLV above the CB3Q is if you are trying to conserve power, but that does come at the cost of performance, as the CB3Q can pass above the rails and has a lower capacitance because less Fets are used in the switch.
If power usage isn't your concern I would suggest the CB3Q part.
For the leakage specs they are both max +/- 1uA with the CB3Q being labeled I_OZ and the CBTLV being labeled I_l.
Unfortunately we do not have cross-talk data for these parts.
I am not an Op-Amp expert, but we do have a couple application notes than can help narrow down your search and give you design tips for integrating multiplexers with Op-Amps
1. Mux Friendly Precision Op Amps
2. Improve Stability with Low Con Muxes
If this doesn't help you, one of our Amplifier Experts can help you select an Op-Amp in the Op-Amp Forum:
As for the TMUX1108 it does not support partial power down.
If you have any other questions don't hesitate to reach out!
We are glad that we were able to resolve this issue, and will now proceed to close this thread.
If you have further questions related to this thread, you may click "Ask a related question" below. The newly created question will be automatically linked to this question.
In reply to Parker Dodson:
Thank you for the prompt response and links.
It's clear now.
All content and materials on this site are provided "as is". TI and its respective suppliers and providers of content make no representations about the suitability of these materials for any purpose and disclaim all warranties and conditions with regard to these materials, including but not limited to all implied warranties and conditions of merchantability, fitness for a particular purpose, title and non-infringement of any third party intellectual property right. No license, either express or implied, by estoppel or otherwise, is granted by TI. Use of the information on this site may require a license from a third party, or a license from TI.
TI is a global semiconductor design and manufacturing company. Innovate with 100,000+ analog ICs andembedded processors, along with software, tools and the industry’s largest sales/support staff.