PI6ULS5V9511AUEX

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. When the connection is made, it provides bidirectional buffering, which keeps the backplane and card capacitances isolated. The 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, and an open-drain READY output pin, which indicates that the backplane and card sides are connected together (HIGH) or not (LOW). During insertion, the SDA and SCL lines are pre-charged to 1.1V to minimize the current required to charge the parasitic capacitance of the chip.

Key features

• Bidirectional Buffer for SDA and SCL Lines Increases Fan Out
• Prevents SDA and SCL Corruption During Live Board Insertion and Removal from Backplane
• Isolates Input SDA and SCL Lines From Output
• Compatible with I2C, I2C Fast Mode, and SMBus Standards (up to 400kHz Operation)
• Built-in Rise-Time Accelerators on all SDA and SCL
• 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
• Supporting Clock Stretching and Multiple Master Arbitration/Synchronization
• ESD Protection Exceeds 4000V HBM per JESD22-A114
• Packages Offered: MSOP-8(U), UDFN-8(ZW), and SOIC-8(W)
• Totally Lead-Free & Fully RoHS Compliant
• Halogen and Antimony Free. “Green” Device