can anyone explain me about quadruple 2-to-1 line multiplexer?

Question

what are the specialities of these circuit...?how it differs from a 2 to1 multiplexer.?

Answer 1

A quadruple 2-to-1 line multiplexor contains 4 2-to-1 line multiplexors in one chip. Depending on the chip the control lines may be independent or together. See

http://www-s.ti.com/sc/ds/sn54157.pdf