Union Semiconductor UM3301DA

The UM3301B/UM3301DA series is one channel level translator with auto direction sensing. This 1-channel non-inverting translator uses two separate configurable power-supply rails. The A port is designed to track VCCA. VCCA accepts any supply voltage from 1.2V to 3.6V. The B port is designed to track VCCB. VCCB accepts any supply voltage from 1.65V to 5.5V. This allows for universal low-voltage bidirectional translation between any of the 1.2V, 1.5V, 1.8V, 2.5V, 3.3V, and 5V voltage nodes. Both I/O ports are auto-sensing, thus no direction control pin is required, making it ideal for data transfer between low-voltage ASICs/PLDs and higher voltage systems. When the output-enable (OE) input is low, all outputs are placed in the high-impedance state. The UM3301B/UM3301DA is designed so that the OE input circuit is designed to track VCCA. To ensure the high-impedance state during power up or power down, OE should be tied to GND through a pull down resistor, the minimum value of the resistor is determined by the current-sourcing capability of the driver. The UM3301DA is available in 1.45mm×1.0mm DFN6 package while the UM3301B is packaged in a SOT563 package.

• 1.2V to 3.6V on A Port and 1.65V to 5.5V on B Port (VCCA ≤ VCCB) VCC Isolation Feature–If Either VCC Input is at GND, All Outputs are in the High-Impedance State
• OE Input Circuit Referenced to VCCA
• Low Power Consumption
• Latch-up Performance Exceeds 100mA
• ±5kV ESD Protection on B Ports

• Low-Voltage ASIC Level Translation
• Cell-Phone Cradles
• Portable POS Systems
• Portable Communication Devices
• Low-Cost Serial Interfaces
• Cell-Phones
• GPS
• Telecommunications Equipment