TCA9545A - Texas Instruments

TCA9545A Low Voltage 4-channel I2C and SMbus Switch

The TCA9545A is a quad bidirectional translating switch controlled via the I2C bus. The SCL/SDA upstream pair fans out to four downstream pairs, or channels. Any individual SCn/SDn channel or combination of channels can be selected, determined by the contents of the programmable control register. Four interrupt inputs (INT3–INT0), one for each of the downstr.

Features

•1 1-of-4 Bidirectional translating switches
• I2C bus and SMBus compatible
• Four active-low interrupt inputs
• Active-low interrupt output
• Active-low reset input
• Two address terminals, allowing up to four devices on the I2C bus
• Channel selection via I2C bus, in any combination
• Power-up with all switch channels deselected
• Low RON switches
• Allows voltage-level translation between 1.8-V, 2.5-V, 3.3-V, and 5-V buses
• No glitch on power-up
• Supports hot insertion
• Low standby current
• Operating power-supply voltage range of 1.65 V to 5.5 V
• 5.5 V Tolerant inputs
• 0 to 400-kHz Cl.