PCA9544A - Texas Instruments

PCA9544A Low Voltage 4-Channel I2C and SMBus Multiplexer

The PCA9544A is a 4-channel, bidirectional translating multiplexer controlled via the I2C bus. The SCL/SDA upstream pair fans out to four downstream pairs, or channels. One SCL/SDA pair can be selected at a time, and this is determined by the contents of the programmable control register. Four interrupt inputs (INT3–INT0), one for each of the downstream pair.

Features

•1 1-of-4 Bidirectional translating switches
• I2C Bus and SMBus compatible
• Four active-low interrupt inputs
• Active-low interrupt output
• Three address pins, allowing up to eight devices on the I2C Bus
• Channel selection via I2C Bus
• 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 2.3 V to 5.5 V
• 5.5-V Tolerant inputs
• 0 to 400-kHz Clock frequency
• Latch-up performance exceeds 100.