[sdiy] can someone explain latches?

David G. Dixon dixon at interchange.ubc.ca
Thu May 7 00:21:38 CEST 2009


Dan,

A "latch" is really just a transparent flip-flop.  Quoting Horowitz and
Hill:

The term "latch" is usually reserved for a special kind of register: one in
which the outputs follow the inputs when enabled and hold the last value
when disabled.  Since the label "latch" has become ambiguous with use, the
terms "transparent latch" and "type D register" are often used to
distinguish these closely related devices."

Hence, a latch will follow the data input whenever it is enabled.  A
register follows the data input only on the transition of a clock pulse.





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