These 8-bit 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
The eight latches of the HCT373 devices are
transparent D-type latches. While the
latch-enable (LE) input is high, the Q outputs
follow the data (D) inputs. When LE is taken low,
the Q outputs are latched at the levels that were
set up at the D inputs.
An output-enable (OE)\ input places 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 off.
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