DIO74546中文资料I2C开关数据手册DIOO规格书

描述 Description

The DIO74546 is a four-channel bidirectional translating switch controlled via the I2C bus. The upstream pair, SCL/SDA, can be connected to four downstream pairs or channels. Users can select any individual SCn/SDn channel or a combination of channels by programming the control register.\
The switch has an active-low reset input that allows it to recover if one of the downstream I2C buses is stuck in a low state. Pulling /RESET low resets the I2C state machine and deselects all the channels, as does the internal power-on reset function. \
The pass gates of the switches are designed to limit the maximum high voltage that passes through the VCC pin. This feature allows the use of different bus voltages on each pair, so that 1.8 V, 2.5 V, or 3.3 V parts can communicate with 5 V parts without any additional protection. External pull-up resistors pull the bus up to the desired voltage level for each channel. All I/O pins are 5.5 V tolerant.

特性 Features

• 1-of-4 bidirectional translating switches
• I2C bus and SMBus compatible
• Active-low reset input
• Three address pins, allowing up to fourDIO74546 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
• Power-supply voltage range: 1.65 V to 5.5 V
• 5.5 V tolerant inputs
• 0 to 400 kHz clock frequency

应用 Application

• Servers
• Routers (telecom switching equipment)
• Factory automation
• Products with I2C slave address conflicts (multiple, identical temp sensors)