I again got stuck the other two ic are not available too. Please suggest any other.
Or can anyone help me making the outputs of the ic 4050 of high impedences only when i receive a high signal? Please help am stuck on the last stage of designing....
Well that seems to be a bigger modification, if done with discrete components.
I found THIS list from someone living in Bangalore, see if it helps.
You can also look through the IC's from alldatasheet.com. Put in "HEX NON-INVERTING 3-STATE BUFFER" in description search field, as you can see there are quite a few results, you will have to look through to find a suitable one with the right voltage ratings and equal or similar pinout.