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