SDAS168B - APRIL 1982 - REVISED JULY 1996
These octal D-type edge-triggered flip-flops feature 3-stateoutputs designed specifically for driving highly capacitive orrelatively low-impedance loads. They are particularly suitable forimplementing buffer registers, I/O ports, bidirectional bus drivers,and working registers.
On the positive transition of the clock (CLK) input, the Q\outputs are set to the complement of the logic states set up at thedata (D) inputs. The 'ALS534A and SN74AS534 have inverted outputs,but otherwise are functionally equivalent to the 'ALS374A andSN74AS374.
A buffered output-enable (
) input places the eight outputs in either a normallogic state (high or low logic levels) or a high-impedance state. Inthe high-impedance state, the outputs neither load nor drive the buslines significantly. The high-impedance state and increased driveprovide the capability to drive bus lines without interface or pullupcomponents.
does not affectthe internal operations of the flip-flops. Old data can be retainedor new data can be entered while the outputs are off.
The SN54ALS534A is characterized for operation over the fullmilitary temperature range of -55°C to 125°C. TheSN74ALS534A and SN74AS534 are characterized for operation from0°C to 70°C.
View more information about generic part numbers:SN54ALS534, SN74ALS534A, SN74AS534
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