PCA9541APW/01,118

PCA9541APW/01,118 is a 2-to-1 I²C-bus host selector designed for high-reliability dual host I²C-bus applications where system operation is required, even when one host fails or the controller card is removed for maintenance. The two host (for example, primary and backup) are located on separate I²C-buses that connect to the same downstream I²C-bus server devices. I²C-bus commands are sent by either I²C-bus host and are used to select one host at a time. Either host at any time can gain control of the server devices if the other host is disabled or removed from the system. The failed host is isolated from the system and does not affect communication between the online host and the server devices on the downstream I²C-bus. The application includes high-reliability systems with dual, gatekeeper multiplexer on a long single bus, bus initialization/recovery for server devices without hardware reset, and allows hosts without arbitration logic to share resources.

• I²C-bus interface logic; compatible with SMBus standards
• Active LOW interrupt input, 2 active LOW interrupt outputs
• Active LOW reset input, 4 address pins allowing up to 16 devices on the I²C-bus
• Channel selection via I²C-bus, bus initialization/recovery function
• Bus traffic sensor, low Ron switches
• No glitch on power-up, supports hot insertion, low standby current
• 6.0V tolerant inputs, 0Hz to 400KHz clock frequency range
• ESD protection exceeds 2000V HBM per JESD22-A114 and 1000V CDM per JESD22-C101
• Latch-up testing is done to JEDEC Standard JESD78 which exceeds 100mA
• TSSOP16 package, ambient temperature range from -40°C to +85°C