zainka
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Hi
I have a design requirement where two systems which have different signal levels (and which may vary from about 2.2V to 5V) are to be connected.
Thought I should solve this by using two TXS0108 from Texas, connected back to back (or more correct A-side to A-side).
Looking at schematic below. TXS0108 have 8 bidirectional channels, and A-Side must have lower voltage than the B-Side, according to datasheet, and both VccA is therefor tied to 2V in our design. I will never know which of the B-Side (B1 or B2 in the image below) that will have highest voltage, but each VccB has its own power source given by the system connected to.
What I call "the system" is a range of different boards (already existing) with I/Os but with different signal levels. This is thought to be a generic solution for all these systems to tie them together,
Image shows two TXS0108 channels connected together on the A-sides and with Rs in between to avoid possible short-circuits if B1 and B2 tries to drive simultaneous
In a normal situation, however, B1 and B2 of a given channel will be one input and one output.
I need a second opinion if this will work or if the TXS0108 are incapable to be used this way, where two A channels are connected together in the same power domain..
I have a design requirement where two systems which have different signal levels (and which may vary from about 2.2V to 5V) are to be connected.
Thought I should solve this by using two TXS0108 from Texas, connected back to back (or more correct A-side to A-side).
Looking at schematic below. TXS0108 have 8 bidirectional channels, and A-Side must have lower voltage than the B-Side, according to datasheet, and both VccA is therefor tied to 2V in our design. I will never know which of the B-Side (B1 or B2 in the image below) that will have highest voltage, but each VccB has its own power source given by the system connected to.
What I call "the system" is a range of different boards (already existing) with I/Os but with different signal levels. This is thought to be a generic solution for all these systems to tie them together,
Image shows two TXS0108 channels connected together on the A-sides and with Rs in between to avoid possible short-circuits if B1 and B2 tries to drive simultaneous
In a normal situation, however, B1 and B2 of a given channel will be one input and one output.
I need a second opinion if this will work or if the TXS0108 are incapable to be used this way, where two A channels are connected together in the same power domain..