SN74BCT29843,pdf(9-Bit Bus-Int

The SN74BCT29843 features 3-state outputs designed specifically for driving highly capacitive or relatively low-impedance loads. It is particularly suitable for implementing wider buffer registers, I/O ports, bidirectional bus drivers with parity, and working registers.

The nine latches are transparent D-type latches. When the latch-enable (LE) input is high, the Q outputs are complementary to the noninverting data (D) inputs.

A buffered output-enable () input can be used to place the nine outputs in either a normal logic state (high or low level) or a 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 need for interface or pull-up components.