PCA9543A

Product Folder Sample & Buy Technical Documents Tools & Software Support & Community PCA9543A SCPS169A – SEPTEMBER 2007 – REVISED JUNE 2014 PCA9543A 2-Channel I2C Bus Switch With Interrupt Logic and Reset 1 Features 1 1-of-2 Bidirectional Translating Switches I2C Bus and SMBus Compatible Two Active-Low Interrupt Inputs Active-Low Interrupt Output Active-Low Reset Input Two Address Pins Allowing up to Four PCA9543A 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 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 JESD78 ESD Protection Exceeds JESD 22 – 2000-V Human-Body Model (A114-A) – 1000-V Charged-Device Model (C101) 2 Applications Servers Routers (Telecom Switching Equipment) Factory Automation Products With I2C Slave Address Conflicts (e.g. Multiple, Identical Temp Sensors) 3 Description The PCA9543A is a dual bidirectional translating switch controlled by the I2C bus. The SCL/SDA upstream pair fans out to two downstream pairs, or channels. Either individual SCn/SDn channel or both channels can be selected, determined by the contents of the programmable control register. Two interrupt inputs (INT1–INT0), o...