The `573' consists of eight D-type transparent latches with 3-State true outputs. When LE is HIGH, data at the D n inputs enters the latches. In this condition the latches are transparent, i.e., a latch output will change each time its corresponding D-input changes. When LE is LOW the latches store the information that was present at the D-inputs a set-up time preceding the HIGH-to-LOW transition of LE. When OE is LOW, the contents of the eight latches are available at the outputs. When OE is HIGH, the outputs go to the high impedance OFFstate. Operation of the OE input does not affect the state of the latches. The `573' is functionally identical to the `563' and the `373', but the `563' has inverted outputs and the `373' has a different pin arrangement.