3-State Buffer-Type Outputs Drive Bus
Lines Directly
Bus-Structured Pinout

description/ordering information
These 8-bit D-type transparent latches feature
3-state outputs designed specifically for driving
highly capacitive or 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 follow the complements of data (D) inputs.
When LE is taken low, the outputs are latched at
the inverse of the levels set up at the D inputs.
A buffered output-enable (OE) input places the
eight outputs in either a normal logic state (high or
low logic levels) 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 high logic
level provide the capability to drive bus lines
without interface or pullup components.
OE does not affect 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.