I'm looking on the best way to interface 2.2V and 1.8V systems. Direct connection draws ~40uA. I only have 20uA in my budget. I have tried a bus switch solution, but apparently they are optimized more for speed than for power, and all of them contain pullup resistors of 40K or less drawing too much excess current. I need two logic lines down, two logic lines up, and one logic line bi-directional. The speed is not critical to the design. Thanks for any thoughts on this.
No isolation required.
OK, then it appears that the ADG324x and ADG330x suggested by FEB will meet your needs.