NXP | PCA9508DP,118

The PCA9508 is a CMOS integrated circuit that supports hot-swap with zero offset and provides level shifting between low voltage (down to 0.9 V) and higher voltage (2.7 V to 5.5 V) for I2C-bus or SMBus applications. While retaining all the operating modes and features of the I2C-bus system during the level shifts, it also permits extension of the I2C-bus by providing bidirectional buffering for both the data (SDA) and the clock (SCL) lines, thus enabling two buses of 400 pF. Using the PCA9508 enables the system designer to isolate two halves of a bus for both voltage and capacitance, and perform hot-swap and voltage level translation. Furthermore, the dual supply pins can be powered up in any sequence; when any of the supply pins are unpowered, the 5 V tolerant I/O are high-impedance.

Features:

• 2 channel, bidirectional buffer isolates capacitance and allows 400 pF on either side of the device
• Supports offset-free hot-swap with IDLE/STOP detect circuitry
• Voltage level translation from 0.9 V to 5.5 V and from 2.7 V to 5.5 V
• Footprint and functional replacement for PCA9515, PCA9515A, PCA9517 and PCA9517A
• I2C-bus and SMBus compatible
• Active HIGH repeater enable input
• Static level offset on B side
• Open-drain input/outputs
• Lock-up free operation