PI6ULS5V9511BUEX

PI6ULS5V9511BUEX is a hot-swappable I2C-bus and SMBus buffer that allows I/O card insertion into a live backplane without corrupting the data and clock buses. Control circuitry prevents the backplane from connecting to the card until a stop command or bus idle occurs on the backplane without bus contention on the card. The PI6ULS5V9511B rise-time accelerator circuitry allows the use of weaker DC pullup currents while still meeting rise-time requirements. It incorporates a digital ENABLE input pin, which enables the device when asserted HIGH and forces the device into a low-current mode when asserted LOW. It also incorporates an open-drain READY output pin, which indicates that the backplane and card sides are connected together (HIGH) or not (LOW). During insertion, the PI6ULS5V9511B SDA and SCL lines are pre-charged to 1.1V to minimize the current required to charge the parasitic capacitance of the chip.

• Bidirectional buffer for SDA and SCL lines increases fan out
• Prevents SDA and SCL corruption during live board insertion and removal from backplane
• Compatible with I2C, I2C fast mode, and SMBus standards (up to 400kHz operation)
• Wide supply voltage range: 2.7V to 5.5V
• Active HIGH ENABLE input, active HIGH READY open-drain output
• High-impedance SDA and SCL pins for VCC=0V
• 1.1V pre-charge on all SDA and SCL lines
• Supports clock stretching and multiple host arbitration/synchronization
• 8-pin, mini small outline package (MSOP), -55°C to +125°C storage temperature
• ESD protection exceeds 4000V HBM per JESD22-A114