SN74ABT16823DGGR

18位总线接口触发器具有三态输出 18-BIT BUS-INTERFACE FLIP-FLOPS WITH 3-STATE OUTPUTS

These 18-bit flip-flops 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 input low, the D-type flip-flops enter data on the low-to-high transitions of the clock. Taking high disables the clock buffer, latching the outputs. Taking the clear input low causes the Q outputs to go low independently of the clock.

A buffered output-enable 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.

does not affect the internal operation of the flip-flops. Old data can be retained or new data can be entered while the outputs are in the high-impedance state.

When VCC is between 0 and 2.1 V, the device is in the high-impedance state during power up or power down. However, to ensure the high-impedance state above 2.1 V, should be tied to VCC through a pullup resistor; the minimum value of the resistor is determined by the current-sinking/current-sourcing capability of the driver.

The SN54ABT16823 is characterized for operation over the full military temperature range of -55°C to 125°C. The SN74ABT16823 is characterized for operation from -40°C to 85°C.