DIO74548, Version 1.1, Aug 2023
DIO74548
Low-Voltage, 8-Channel I2C Switch with Reset
Description
The DIO74548 is an 8-channel, bidirectional translating switch that can be controlled through the I2C bus.
The SCL/SDA upstream signal pair fans out to eight downstream pairs, or channels. The contents of the
programmable control register determine the pair or pairs of SCn/SDn to be selected. The downstream
channels resolve the I2C slave address conflicts.
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Either asserting the RESET pin low or cycling the power supply, which is called power-on reset (POR),
resets the state machine of the device and deselect all channels if one of the downstream I2C buses get
stuck in a low state.
The voltage conversion feature enables parts of 1.8 V, 2.5 V, or 3.3 V to communicate with 5 V parts
without any additional protection by using external pull-up resistors to pull the bus to the desired voltage
level for each channel. All I/O pins have a 5 V tolerance.
Features
1-to-8 bidirectional translating switches
I2C bus and SMBus compatible
Active-low reset input
No glitch on power-up
Supports hot insertion
Low standby current
Three address pins, allowing up to eight
DIO74548 devices on the I2C bus
Channel selection through an I2C bus, in any
combination
Operating power-supply voltage range: 1.65 V
to 5.5 V
Input tolerance: 5 V
Clock frequency: 0 to 400 kHz
ESD HBM ±8000 V
Power up with all switch channels deselected
Low RON switches
ESD CDM ±2000 V
Allows voltage-level translation between 1.8 V,
2.5 V, 3.3 V, and 5 V buses
Package: TSSOP24 and QFN4*4-24
Applications
Servers
Routers (telecom switching equipment)
Factory automation
Products with I2C slave address conflicts
www.dioo.com
© 2023 DIOO MICROCIRCUITS CO., LTD.
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