DESCRIPTION

· The PCA9522 is a monolithic bipolar IC designed for bus buffering in I2C-bus, SMBus, and similar applications.
· It features hot insertion logic for detecting stop and idle conditions, enabling live insertion into backplanes.
· The buffer extends bus load limits by buffering both SCL and SDA lines.
· It supports bus level translation from 1.8 V to 10 V, offering flexibility in interfacing systems with different technologies and operating speeds.
· The PCA9522 is a drop-in replacement for the IES5502, with a reduced maximum bus voltage from 15 V to 10 V.

FEATURES

· Dual, bidirectional unity gain isolating buffer.
· Hot insertion logic prevents data and clock bus corruption during live backplane insertion.
· Pre-charge feature minimizes data corruption on live insertion.
· Supports I2C-bus (Standard-mode and Fast-mode), SMBus, and PMBus.
· Open-collector ready output (RDY) indicates connection status.
· Fast switching times enable operation above 1 MHz.
· Enable (EN) function allows bus segments to be disconnected.
· Low current standby mode and high-impedance ports when unpowered.
· 6 mA static pull-down capability and low noise susceptibility.
· Supports series connection of multiple buffers.

APPLICATIONS

· Live insertion into backplanes in industrial and communication systems.
· Bus buffering and level translation in mixed-voltage systems.
· Isolation and control of bus segments in complex I2C or SMBus networks.
· Integration into systems requiring high-speed and low-noise bus communication.