Product Summary

informationThese octal transparent D-type latches feature 3-state outputs designed specifically for driving highly capacitiveor relatively low-impedance loads. They 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, theoutputs are latched to retain the data that was set up.A buffered output-enable (OE) input can be used to place the eight outputs in either a normal logic state (highor low logic levels) or the high-impedance state. In the high-impedance state, the outputs neither load nor drivethe bus lines significantly. The high-impedance state and increased drive provide the capability to drive bus lineswithout interface or pullup components

Features

To ensure the high-impedance state during power up or power down, OE should be tied to VCC through a pullupresistor; the minimum value of the resistor is determined by the current-sinking capability of the driver.OE does not affect the internal operations of the latches. Old data can be retained or new data can be enteredwhile the outputs are in the high-impedance state.