STMicroelectronics Intros CMOS Bus Switch Family
STMicroelectronics Inc. (ST, Geneva, Switzerland) introduced a set of four high-speed CMOS, 20-bit bus switches that are pin-compatible with existing TTL parts. They 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. The parts are compatible with TTL outputs and operate from supply voltages of 4V to 5.5V. They have power-down protection on the inputs and outputs and are designed with improved latch-up immunity and an ESD protection to 2KV. Power dissipation is typically 1µA.
The B5S16861 is a high-speed CMOS, 20-bit, two-port, bus switch, which can be controlled as two 10-bit buses or one 20-bit bus. Typical delay is a maximum of 0.25ns at 4.5V. The on resistance between two ports is typically 5 ohms. The B5S162861 has a 25-ohm series resistor in each output. The typical delay is a maximum of 1.25ns at 4.5V. The on resistance between two ports is typically 25 ohms. The B5S16862 has four enable lines so it can be configured as four 5-bit buses or one 20-bit bus. The typical delay of the device is a maximum of 0.25ns at 4.5V. The on resistance between two ports is typically 5 ohms. The B5S162862 has four enable lines so it can be configured as four 5-bit buses or one 20-bit bus. Each output also has a 25-ohm series resistor, reducing reflection noise. The typical delay of the device is a maximum of 1.25ns at 4.5V. The on resistance between two ports is typically 25 ohms.
The parts are available in TSSOP48 package for $0.78 in 1,000-unit quantities.
