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In theory there is no limit as long as only one device is enabled at any time.
In practise, the limit is the capaitance and delays along the bus connections, there must be adequate time for the signal to reach the far end of the bus and to charge/discharge the capacitance of the bus wiring and all the other drivers.
Brian.
So you mean current on bus will flow in to tri-gate device. Current direction is from bus to tri-gate device, right?Yes but unless you have many devices it wouldn't be a problem. The current flowing inbound to the output of a tri-state device would be very small as both the output transistors would be turned off, it wouldn't normally be more an a few uA.
The current flowing in to the inputs of devices on the bus would be more of an issue but as long as you stay within the fan-out rating of the active driver it should reach acceptable logic levels and work OK.
Brian.