SN54HCT573, SN74HCT573,pdf(OCT

These octal transparent D-type latches feature 3-state outputs designed specifically for driving highly capaciTIve or relaTIvely low-impedance loads. The ’HCT573 devices are parTIcularly suitable for implemenTIng buffer registers, I/O ports, bidirectional bus drivers, and working registers.

While the latch-enable (LE) input is high, the Q outputs respond to the data (D) inputs. When LE is low, the outputs are latched to retain the data that was set up at the D inputs.

A buffered output-enable (OE)\ input can be used to place the eight outputs in either a normal logic state (high or low logic levels) or the high-impedance state. In the high-impedance state, the outputs neither load nor drive the bus lines significantly.