AB32 - Pericom Semiconductor

AB32 3.3V Bus Switches

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Features

esigned with near zero delay, low ON Resistance (five ohms), low-capacitance, and ultralow quiescent power. For reliability, the unused module data pins should be connected to ground. Figure 1 shows the application of Pericom’s PI3B16226 bus switches in a Intel Pentium II memory system with bus speeds of 133 MHz and 133 MHz SDRAM DIMMs. To prevent overloading, a bus switch is required where more than three SDRAM DIMMs are connected to the bus. The block diagram shows that the DIMM modules are connected to the B ports of the bus switch. The PI3B16226 (see Figure 2), has weak pull-down resistors.