These 8-bit registers feature totem-pole 3-STATE outputs
designed specifically for driving highly-capacitive or relatively low-impedance loads. The high-impedance state and increased high-logic-level drive provide these registers with the capability of being connected directly to and driving the bus lines in a bus-organized system without need for interface or pull-up components. They are particularly attractive for implementing buffer registers, I/O ports, bidirectional bus drivers, and working registers. The eight flip-flops of the 74ALS534 are edge-triggered inverting D-type flip-flops. On the positive transition of the clock, the Q outputs will be set to the complement of the logic states that were set up at the D inputs. A buffered output control 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 output control does not affect the internal operation of the flip-flops. That is, the old data can be retained or new data can be entered even while the outputs are off.
Switching specifications at 50 pF
Switching specifications guaranteed over full temperature and VCC range
Advanced oxide-isolated, ion-implanted Schottky TTL process
3-STATE buffer-type outputs drive bus lines directly
20 pin DIP. Actual brand may vary from picture.