SCBS187A - FEBRUARY 1991 - REVISED JULY 1994
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The ŽABT534 are 8-bit flip-flops with 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 flip-flops of the ŽABT534 are edge-triggered D-type flip-flops. On the positive transition of the clock, the Q\ outputs are set to the complement of the logic levels that were set up at the data (D) inputs. The ŽABT534 provide inverted data at their outputs.
A buffered output-enable (OE\) 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 the increased drive provide the capability to drive bus lines without need for interface or pullup components.
The output-enable (OE\) input does not affect the internal operations of the flip-flop. Previously stored data can be retained or new data can be entered while the outputs are in the high-impedance state.
To ensure the high-impedance state during power up or power down, OE\ should be tied to VCC through a pullup resistor; the minimum value of the resistor is determined by the current-sinking capability of the driver.
The SN74ABT534 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 SN54ABT534 is characterized for operation over the full military temperature range of -55°C to 125°C. The SN74ABT534 is characterized for operation from -40°C to 85°C.
View more information about generic part numbers:SN54ABT534, SN74ABT534
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