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. The high-impedance state and increased drive provide the capability to drive bus lines without interface or pullup components.
●OE\ does not affect the internal operations of the latches. Old data can be retained or new data can be entered while the outputs are in the high-impedance state.
● Operating Voltage Range of 4.5 V to 5.5 V
● High-Current 3-State Outputs Drive Bus Lines Directly or Up To 15 LSTTL Loads
● Low Power Consumption, 80-µA Max ICC
● Typical tpd = 21 ns
● ±6-mA Output Drive at 5 V
● Low Input Current of 1 µA Max
● Inputs Are TTL-Voltage Compatible
● Bus-Structured Pinout
