SCBS074B - SEPTEMBER 1991 - REVISED NOVEMBER 1993
These 8-bit flip-flops feature 3-state outputs designedspecifically for driving highly capacitive or relativelylow-impedance loads. They are particularly suitable for implementingbuffer registers, I/O ports, bidirectional bus drivers, and workingregisters.
The eight flip-flops of the ´BCT574 are edge-triggered D-typeflip-flops. On the positive transition of the clock (CLK) input, theQ outputs will be set to the logic levels that were set up at thedata (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 flip-flops. Old datacan be retained or new data can be entered while the outputs are inthe high-impedance state.
The SN54BCT574 is characterized for operation over the fullmilitary temperature range of -55°C to 125°C. TheSN74BCT574 is characterized for operation from 0°C to 70°C.
View more information about generic part numbers:SN54BCT574, SN74BCT574
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