PCA9545A

Product Folder Sample & Buy Technical Documents Tools & Software Support & Community PCA9545A SCPS147D – OCTOBER 2005 – REVISED JUNE 2014 PCA9545A Low Voltage 4-channel I2C and SMbus Switch With Interrupt Logic and Reset Functions 1 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 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) – 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 PCA9545A 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. F...