Dual 2:4 decoder/demultiplexer for address decoding and signal routing
Each of the two independent circuits selects one of four active-low outputs based on a 2-bit address input, with an active-low enable per section.
Output drive — fan-out and bus loading
Outputs source 400 µA and sink 8 mA. That sink current is enough to drive up to ten 74ALS or 74LS standard loads, but the weak source current means it cannot directly drive LED indicators or relay coils without a buffer. For bus-oriented designs, the 8 mA sink handles terminated backplanes with moderate fan-out; expect to add a line driver for heavily loaded or long traces.