Texas Instruments SN74AHCT573 Octal Transparent D-Type Latches that include inputs that are TTL-voltage compatible. The Q outputs follow the data (D) inputs when the latch-enable (LE) input is high. The Q outputs are latched at the logic levels of the D inputs when LE is low. A buffered output-enable (/OE) input can be used to place the eight outputs in either the high-impedance state or a normal logic state (high or low). The outputs neither load nor drive the bus lines significantly in the high-impedance state. The high-impedance state and increased drive capability enable the bus lines to be driven without requiring interface or pull-up components.
