These 20-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 'ACT16841 can be used as two 10-bit latches or one 20-bit
latch. The 20 latches are transparent D-type. While the latch-enable
(1LE or 2LE) input is high, the Q outputs of the corresponding 10-bit
latch 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.
A buffered output-enable (1 or 2) input can be
used to place the outputs of the corresponding 10-bit latch 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.
affect the internal operation of the latches. Old data can be
retained or new data can be entered while the outputs are in the
The 74ACT16841 is packaged in TI's shrink small-outline package
(DL), which provides twice the I/O pin count and functionality of
standard small-outline packages in the same printed-circuit-board
The 54ACT16841 is characterized for operation over the full
military temperature range of -55°C to 125°C. The
74ACT16841 is characterized for operation from -40°C to
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