SN54F573

These 8-bit latches feature 3-state outputs designed specifically for driving highly capacitive or relatively low-impedance loads. SN54F573 is particularly suitable for implementing buffer registers, I/O ports, bidirectional bus drivers, and working registers.

The eight latches of the 4F573 are transparent D-type latches. While the latch enable (LE) input is high, the Q outputs follow the data (D) inputs. When the latch enable is taken low, the Q outputs are latched at the logic levels set up at the D inputs.

A buffered output enable (OE) input of SN54F573 can be used to place the eight outputs in either a normal logic state (high or low logic levels) or a highimpedance 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 need for interface or pullup components.

The output enable (OE) input does not affect the internal operations of the latches. Old data of SN54F573 can be retained or new data can be entered while the outputs are in the high-impedance state.

The SN54F573 is characterized for operation over the full military temperature range of 55 to 125. The SN74F573 is characterized for operation from 0 to 70.