BiCMOS Technology With Low Quiescent

Power

Buffered Inputs

Noninverted Outputs

Input/Output Isolation From VCC

Controlled Output Edge Rates

64-mA Output Sink Current

Output Voltage Swing Limited to 3.7 V

SCR Latch-Up-Resistant BiCMOS Process

and Circuit Design

Package Options Include Plastic

Small-Outline (M) and Shrink Small-Outline

(SM) Packages and Standard Plastic (E) DIP

description

The CD74FCT623 is an octal bus transceiver that uses a small-geometry BiCMOS technology. The output stage

is a combination of bipolar and CMOS transistors that limits the output high level to two diode drops below VCC.

This resultant lowering of output swing (0 V to 3.7 V) reduces power-bus ringing [a source of electromagnetic

interference (EMI)] and minimizes VCC bounce and ground bounce and their effects during simultaneous output

switching. The output configuration also enhances switching speed and is capable of sinking 64 mA.

This device is a noninverting, 3-state, bidirectional transceiver-buffer intended for two-way transmission from

A bus to B bus or B bus to A bus, depending on the logic levels of the output-enable (OEAB, OEBA) inputs.

The dual output-enable provision gives these devices the capability to store data by simultaneously enabling

OEAB and OEBA. Each output reinforces its input under these conditions, and when all other data sources to

the bus lines are at high impedance, both sets of bus lines remain in their last states.

The CD74FCT623 is characterized for operation from 0°C to 70°C.