RS0302YH8

This dual bidirectional I²C and SMBus voltage-level translator, with an enable (EN) input, is operational from 1.0V to 5.5V VREF1 and 1.8V to 5.5V VREF2. The RS0302 allows bidirectional voltage translations between 1.0V and 5V without the use of a direction pin. The low ON-state resistance (Ron) of the switch allows connections to be made with minimal propagation delay. When EN is HIGH, the translator switch is ON, and the SCL1 and SDA1 I/O are connected to the SCL2 and SDA2 I/O, respectively, allowing bidirectional data flow between ports. When EN is LOW, the translator switch is off, and a high-impedance state exists between ports. In I²C applications, the bus capacitance limit of 400 pF restricts the number of devices and bus length. Using the RS0302 enables the system designer to isolate two halves of a bus; thus, more I²C devices or longer trace length can be accommodated. The RS0302 also can be used to run two buses, one at 400kHz operating frequency and the other at 100kHz operating frequency. If the two buses are operating at different frequencies, the 100kHz bus must be isolated when the 400kHz operation of the other bus is required. If the master is running at 400kHz, the maximum system operating frequency may be less than 400kHz because of the delays added by the repeater. The RS0302 are available in green SOT23-8 and DFN1.4x1.0-8L packages. It operates over an ambient temperature range of -40°C to +85°C.

Applications

• I2C, SMBus, PMBus, MDIO, UART, Low-Speed SDIO, GPIO, and Other Two-Signal Interfaces
• Automotive Head Units
• Automotive Instrument Clusters
• Automotive Driver Assistance Cameras

Key features

• 1.0V to 5.5V VREF1 and 1.8V to 5.5V VREF2 (VREF1 < VREF2)
• 2-Bit Bidirectional Translator for SDA and SCL Lines in Mixed-Mode I²C Applications
• Compatible with I²C and SMBus
• Less Than 1.5ns Maximum Propagation Delay to Accommodate Standard-Mode and Fast Mode I²C Devices and Multiple Masters
• Provides bidirectional voltage translation with no direction pin
• Allows Voltage-Level Translation Between:
• -1.0V VREF1 and 1.8V, 2.5V, 3.3V or 5V VREF2
• -1.2V VREF1 and 1.8V, 2.5V, 3.3V or 5V VREF2
• -1.8V VREF1 and 2.5V, 3.3V or 5V VREF2
• -2.5V VREF1 and 3.3V or 5V VREF2
• -3.3V VREF1 and 5V VREF2
• Low 3.5Ω ON-State Connection Between Input and Output Ports Provides Less Signal Distortion
• Open-Drain I²C I/O Ports (SCL1, SDA1, SCL2 and SDA2)
• High-Impedance SCL1, SDA1, SCL2 and SDA2 Pins for EN = Low
• Lock-Up-Free Operation for Isolation When EN = Low
• 5V Tolerant I²C I/O Ports to Support Mixed Mode Signal Operation
• Extended Temperature: -40°C to ±85°C