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 working registers.
The eight latches of the ´F373 are transparent D-type
latches. While the latch-enable (LE) input is high, the Q outputs
will 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 () input can be used to place the eight outputs in either
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 drive
provide the capability to drive bus lines without need for interface
or pullup components.
The output-enable ()
input does not affect the 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.
The SN74F373 is available in TI's shrink small-outline package
(DB), which provides the same I/O pin count and functionality of
standard small-outline packages in less than half the
The SN54F373 is characterized for operation over the full military
temperature range of -55°C to 125°C. The SN74F373 is
characterized for operation from 0°C to 70°C.
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