SN74BCT29823 9-BIT BUS-INTERFACE FLIP-FLOP WITH 3-STATE OUTPUTS

SCBS018D - NOVEMBER 1988 - REVISED NOVEMBER 1993

features

• State-of-the-Art BiCMOS Design Significantly Reduces I_CCZ
• ESD Protection Exceeds 2000 V Per MIL-STD-883C, Method 3015; Exceeds 200 V Using Machine Model (C = 200 pF, R = 0)
• 3-State Buffer-Type Outputs Drive Bus Lines Directly
• Package Options Include Plastic Small-Outline (DW) Packages and Standard Plastic 300-mil DIPs (NT)

description

This 9-bit bus-interface flip-flop features 3-state outputsdesigned specifically for driving highly capacitive or relativelylow-impedance loads. It is particularly suitable for implementingwider buffer registers, I/O ports, bidirectional bus drivers withparity, and working registers.

The nine flip-flops are edge-triggered D-type flip-flops. With theclock-enable () input low,the flip-flops store data on the low-to-high transitions of theclock. Taking high disablesthe clock buffer, thus latching the outputs. The SN74BCT29823 hasnoninverting data (D) inputs. Taking the clear () input low causes the nine Qoutputs to go low independent of the clock.

A buffered output-enable () input can be used to place the nine outputs in eithera normal logic state (high or low) or a high-impedance state. In thehigh-impedance state, the outputs neither load nor drive the buslines significantly. The high-impedance state and increased driveprovide the capability to drive bus lines without need for interfaceor pullup components.

The output enable ()does not affect the internal operation of the flip-flops. Old datacan be retained or new data can be entered while the outputs are inthe high-impedance state.

The SN74BCT29823 is characterized for operation from 0°C to70°C.

View more information about generic part numbers:SN74BCT29823

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