Home > Products > Interface > Level Shifter
Datasheet Reliability Report Package Information Order Sample  
Key Specifications
Part Number Description Status VCCA(Min)(V) VCCA(Max)(V) VCCB(Min)(V) VCCB(Max)(V) Max Data Rate(Mbps) No. of Bits Operating Temperature Range(℃) Pin/Package EV Kit Available?
UM3301B 1-Bit Bidirectional Voltage-Level Translator with Auto Direction Sensing ACTIVE 1.2 3.6 1.65 5.5 100 1 -40 to 85 6/SOT563
View All>>
Product Description
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.
The UM3301B/UM3301DA operates at a guaranteed data rate of 20Mbps over the entire specified operating voltage range. Within specific voltage domains, higher data rates are up to 100Mbps.
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
Typical Application Circuit

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

Ordering Information
Part Number
Packaging Type
Marking Code
Shipping Qty
Tape & Reel
@2014 Union Semiconductor Limited. All rights Reserved.