Transparent latch
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A transparent latch is an electronic data storage device with a data input (D), an enable input (E) and a data output (Q). When E is high, Q = D. In other words, the latch is "transparent". When E is low, Q maintains the value it had when E was last high. In this state, the latch stores data.
In the single phase clocked synchronous digital circuits, the edge triggered latches are often preferred to transparent latches.
Transparent latches are available as integrated circuits, usually with multiple latches per circuit. For example, in the ubiquitous 7400 series of integrated circuits, type 7475 is a quadruple transparent latch.
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