SN7475 quad bistable latches

SN7475 quad bistable latches

These latches are ideally suited for use as temporary storage for binary information between processing units and input/output or indicator units. Information present at a data (D) input is transferred to the Q output when the enable (C) is high and the Q output will follow the data input as long as the enable remains high. When the enable goes low, the information (that was present at the data input at the time the transition occurred) is retained at the Q output until the enable is permitted to go high.
http://www.nalanda.nitc.ac.in/industry/appnotes/TI_logic/data/ /sc/psheets/sdls120/sdls120.pdf