SCBS016C - SEPTEMBER 1988 - REVISED NOVEMBER 1993
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 ´BCT373 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 will be latched at the logic levels that were set up at the D inputs.
A buffered output-enable (
) input can be used to place 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 drive provide the capability to drive bus lines without
need for interface or pullup components.
The output enable ()
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 SN74BCT373 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 printed-circuit-board area.
The SN54BCT373 is characterized for operation over the full military temperature range of -55°C to 125°C. The SN74BCT373 is characterized for operation from 0°C to 70°C.