L293E is a quad push-pull drivers capable of delivering output currents to 1A per channel. Each channel is controlled by a TTL-compatible logic input and each pair of drivers (a full bridge) is equipped with an inhibit input which turns off all four transistors. A separate supply input is provided for the logic so that it may be run off a lower voltage to reduce dissipation. Additionally, the L293E has external connection of sensing resistors, for switchmode control. L293E is packaged in 20-pin plastic DIPs , it uses the four center pins to conduct heat to the printed circuit board.
Additional information, pictures and schematic diagrams you can find at:
http:// /document.asp?document_id=545&link=Datasheets/st/l293.pdf