Digital ICs/DSP: CMOS 20-Bit Bus Switches Replace TTL Equivalents

Feb. 2, 2004

A set of four high-speed CMOS 20-bit bus switches provides pin-compatible equivalents to existing transistor-transistor-level (TTL) parts. These switches are designed for use in applications such as PCI hot-card insertion and voltage-level translation, notebook docking stations, memory interleaving, and general-purpose switching. They also feature a high off-resistance and a low on-resistance. Power dissipation is typically 1 µA. The B5S16861 and B5S16862 are 20-bit two-port bus switches. The '861 can be configured as two 10-bit buses or one 20-bit bus, while the '862's four enable lines allow it to be configured as four 5-bit buses or one 20-bit bus. The B5S162861 and B5S162862 are similar to the B5S16861/862 but include a 2-Ω series resistor in each output. Each version comes in a TSSOP48 package and costs $0.78 each in 1000-unit lots.

STMicroelectronicswww.st.com

About the Author

Dave Bursky

Technologist

Dave Bursky, the founder of New Ideas in Communications, a publication website featuring the blog column Chipnastics – the Art and Science of Chip Design. He is also president of PRN Engineering, a technical writing and market consulting company. Prior to these organizations, he spent about a dozen years as a contributing editor to Chip Design magazine. Concurrent with Chip Design, he was also the technical editorial manager at Maxim Integrated Products, and prior to Maxim, Dave spent over 35 years working as an engineer for the U.S. Army Electronics Command and an editor with Electronic Design Magazine.