SN74LS259BN

The SN74LS259BN is an octal Addressable Latch designed for general purpose storage applications in digital systems. Specific uses include working registers, serial-holding registers and active-high decoders or demultiplexers. It is multifunctional device capable of storing single-line data in eight addressable latches and being a 1-of-8 decoder or demultiplexer with active-high outputs. Four distinct modes of operation are selectable by controlling the clear (CLR\) and enable (G\) inputs as enumerated in the function table. In the addressable-latch mode, data at the data-in terminal is written into the addressed latch. The addressed latch will follow the data input with all unaddressed latches remaining in their previous states. In the memory mode, all latches remain in their previous states and are unaffected by the data or address inputs.