Low Voltage 4-Channel I2C and SMBus Switch
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PCA9546A
SCPS148G – OCTOBER 20...
Description
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PCA9546A
SCPS148G – OCTOBER 2005 – REVISED MAY 2016
PCA9546A Low Voltage 4-Channel I2C and SMBus Switch with Reset Function
1 Features
1 1-of-4 Bidirectional Translating Switches I2C Bus and SMBus Compatible Active-Low Reset Input Three Address Pins, Allowing up to Eight
PCA9546A 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
(for example. Multiple, Identical Temp Sensors)
3 Description
The PCA9546A 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.
An active-low reset (RESET) input allows the PCA9546A to recover from a s...
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