SDFS028A - D2932, MARCH 1987 - REVISED OCTOBER 1993
These 8-bit flip-flops feature 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 ´F534A 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 states that were set up at the data (D) inputs. The ´F534A is equivalent to the ´F374 except for having inverted outputs.
A buffered output enable (
) 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
high-impedance state and increased drive provide the capability to
drive bus lines without need for interface or pullup components.
The output enable ()
does not affect the internal operations of the flip-flops. Old data
can be retained or new data can be entered while the outputs are off.
The SN54F534A is characterized for operation over the full military temperature range of -55°C to 125°C. The SN74F534A is characterized for operation from 0°C to 70°C.