18-BIT BUS-INTERFACE FLIP-FLOPS WITH 3-STATE OUTPUTS

These 18-bit Flip-Flops SN54ABT16823 SN74ABT16823 feature 3-state outputs designed specifically for driving highly capacitive or relatively low-impedance loads. They are particularly suitable for implementing wider Buffer Registers I/O ports, bidirectional bus drivers with parity, and working Registers The ABT16823 CAN be used as two 9-bit Flip-Flops or one 18-bit Flip-Flop With the clock-enable (CLKEN) input low, the D-type Flip-Flops enter data on the low-to-high transitions of the Clock Taking CLKEN high disables the Clock Buffer latching the outputs. Taking the clear (CLR) input low causes the Q outputs to go low independently of the Clock A buffered output-enable (OE) input CAN be used to place the nine outputs in either a normal Logic state (high or low Logic level) 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. By Texas Instruments