DESCRIPTION

· The UM3212 is a dual bidirectional I2C-bus and SMBus voltage-level translator with an enable (EN) input.

· It operates from 1.0V to 3.6V (V ref(1)) and 1.8V to 5.5V (V bias(ref)(2)).

· It allows bidirectional voltage translations between 1.0V and 5V without a direction pin.

· The low ON-state resistance (R on) ensures minimal propagation delay.

· When EN is HIGH, SCL1 and SDA1 are connected to SCL2 and SDA2, enabling bidirectional data flow.

· When EN is LOW, the translator switch is off, creating a high-impedance state between ports.

· It supports Standard-mode, Fast-mode, and Fast-mode Plus I2C-bus devices, as well as SMBus devices.

FEATURES

· Dual bidirectional I2C-bus and SMBus voltage-level translation.

· Operational voltage ranges: 1.0V to 3.6V and 1.8V to 5.5V.

· Low ON-state resistance for minimal propagation delay.

· EN input for enabling or disabling the translator.

· Supports multiple I2C-bus modes and SMBus devices.

· Excellent ESD protection for lower voltage devices.

· Symmetrical switch fabrication ensures minimal deviation in voltage or propagation delay.

APPLICATIONS

· I2C, SMBus, and SPI level translation.

· Low-voltage ASIC level translation.

· Smart card readers and cell-phone cradles.

· Portable POS systems and communication devices.

· Low-cost serial interfaces and cell-phones.

· GPS and telecommunications equipment.