Electronic – ny bidirectional IC with on/off state

bidirectionalbufferintegrated-circuitisolation

I need a bidirectional IC with on/off state.

In on state, IC should have very small impedance on the line.

In off state, IC should provide very high impedance to isolate the bus.

It's for an 3-channel line isolation. To be more specific, it's for SPI bus isolation.

No need for level shifting. Just need to be able to isolate the bus with a logic high or low.

I am looking for a IC because I want to make my board more compact, not because it cannot be done use discrete components. I have been searching all this afternoon. Most of the ICs are for I2C level shifting from high to low or low to high.

Thanks

Updates:
1. Thanks for suggesting the analog IC switch. I am deciding in between analog IC switch and digital IC switch. It looks like the only difference is one is made of CMOS and one is only made of NMOS.

  1. I also found this Digital Bus Switch ICs Single FET. Is it bi-directional?

  2. I found 74HC243 does exactly what I want. The trick is the to search the right name. Now that I know what name to search, I found tons of chips from different companies that does the same. thing.

Best Answer

It sounds like a device similar to the TXB0108 would work for your needs.

It has an output enable pin which places all of the pins in high impedance state, otherwise it is a bi-directional signal translator.

txb0108