PCA9544A

Product Folder Order Now Technical Documents Tools & Software Support & Community PCA9544A SCPS146F – OCTOBER 2005 – REVISED AUGUST 2019 PCA9544A Low Voltage 4-Channel I2C and SMBus Multiplexer With Interrupt Logic 1 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 mA Per JESD 78 ESD Protection exceeds JESD 22 – 2000-V Human-body model (A114-A) – 200-V Machine model (A115-A) – 1000-V Charged-device model (C101) 2 Applications Servers Routers (Telecom Switching Equipment) Factory Automation Products With I2C Slave Address Conflicts (For Example, Multiple, Identical Temp Sensors) 3 Description 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)...