SCBS033B - AUGUST 1989 - REVISED NOVEMBER 1993
The ´BCT534 is an 8-bit flip-flop with 3-state outputs designed specifically for driving highly capacitive or relatively low-impedance loads. It is particularly suitable for implementing buffer registers, I/O ports, bidirectional bus drivers, and working registers.
The eight flip-flops of the ´BCT534 are edge-triggered D-type flip-flops. On the positive transition of the clock, the Q\ outputs will be set to the complement of the logic levels that were set up at the data (D) inputs. The ´BCT534 provides inverted data at its outputs.
A buffered output-enable (
) 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 ()
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.
The SN54BCT534 is characterized for operation over the full military temperature range of -55°C to 125°C. The SN74BCT534 is characterized for operation from 0°C to 70°C.