SCBS071A - AUGUST 1990 - REVISED NOVEMBER 1993
These 8-bit latches feature 3-state outputs designed specificallyfor driving highly capacitive or relatively low-impedance loads. Theyare particularly suitable for implementing buffer registers, I/Oports, bidirectional bus drivers, and working registers.
The eight latches of the ´BCT573 are transparent D-typelatches. While the latch-enable (LE) input is high, the Q outputswill 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 atthe D inputs.
A buffered output-enable (
) input can be used to place the eight outputs in eithera normal logic state (high or low logic levels) or a high-impedancestate. In the high-impedance state, the outputs neither load nordrive the bus lines significantly. The high-impedance state andincreased drive provide the capability to drive bus lines withoutneed for interface or pullup components.
The output enable ()does not affect the internal operations of the latches. Old data canbe retained or new data can be entered while the outputs are in thehigh-impedance state.
The SN54BCT573 is characterized for operation over the fullmilitary temperature range of -55°C to 125°C. TheSN74BCT573 is characterized for operation from 0°C to 70°C.
View more information about generic part numbers:SN54BCT573, SN74BCT573
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