SCAS541B - OCTOBER 1995 - REVISED JUNE 1996
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These 8-bit flip-flops feature 3-state outputs designedspecifically for driving highly capacitive or relativelylow-impedance loads. The devices are particularly suitable forimplementing buffer registers, I/O ports, bidirectional bus drivers,and working registers.
The eight flip-flops of the ´AC574 are D-type edge-triggeredflip-flops. On the positive transition of the clock (CLK) input, theQ outputs are set to the logic levels set up at the data (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 the high-impedancestate. In the high-impedance state, the outputs neither load nordrive the bus lines significantly. The high-impedance state and theincreased drive provide the capability to drive bus lines in abus-organized system without need for interface or pullup components.
does not affectinternal operations of the flip-flop. Old data can be retained or newdata can be entered while the outputs are in the high-impedancestate.
The SN54AC574 is characterized for operation over the fullmilitary temperature range of -55°C to 125°C. The SN74AC574is characterized for operation from -40°C to 85°C.
View more information about generic part numbers:SN54AC574, SN74AC574
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